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Hutaf Baker

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pranab kumar tarafder

University of Chittagong

Manal Mohamed Ibrahim Eid

Mansoura University

An-Najah National University

Federal University Ndufu Alike Ikwo

Ashutosh Pandey

University of Natural Resources and Life Sciences, Vienna (BOKU)

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Papers by Hutaf Baker

Spectrophotometric Method for Determination of Chromium Ion in Aqueous Solution Using Ninhydrin

American Journal of Analytical Chemistry, 2022

A simple, precise, inexpensive and reproducible spectrophotometric method was investigated for th... more A simple, precise, inexpensive and reproducible spectrophotometric method was investigated for the determination of chromium ion (III) in aqueous media, this method based on the formation of a complex between chromium ion (III) and ninhydrin, a deep greenish-violet colored product in the presence of potassium hydroxide was obtained. The absorption of this product was measured at λ max = 375 nm. The reaction proceeds quantitatively at room temperature. The linear calibration curve was constructed over range of (4.8 × 10 −4-1.6 × 10 −2) mol/L of chromium ions with molar absorptivity of 2.90 × 10 2 and correlation coefficient R 2 = 0.9989. The calculated Sandell's sensitivity value is 0.179 µg/cm 2 , the limits of detection (LOD) and the limit of quantification (LOQ) are found to be 3.74 × 10 −5 and 1.24 × 10 −4 mol/L, respectively. The method was successfully applied for determination of the chromium ion in aqueous solution. The stoichiometry of the reactions was determined molar combining ratio of 1:2 between chromium and ninhydrin.

Effects of pH and Temperature on the Interaction of Pb(II) with Azraq Humic Acid Studied with Schubert's Ion Exchange Method

The binding of Pb(II) to humic acid extracted from the Azraq Oasis was studied. The influence of ... more The binding of Pb(II) to humic acid extracted from the Azraq Oasis was studied. The influence of temperature and pH was investigated at a constant ionic strength of 0.1. This analysis was done using Schubert's ion-exchange equilibrium method and its modified version. The data showed temperature and pH dependence. The derived conditional stability constants (log βn) for 1:1 and 1:2 lead-humate complexes were determined. It was noticed that the conditional stability constant (log β1) increased with increasing pH and temperature. The derived constants and their temperature dependences were used to calculate the corresponding thermodynamic parameters ΔG, ΔH and ΔS. The results indicate that the stability of these complexes derives from a very favorable entropy increase. Permanent URL: http://hdl.handle.net/2047/d10006126

Spectroscopic and photophysical properties of terbutaline

In this paper, we report the photophysical and spectroscopic properties of terbutaline in differe... more In this paper, we report the photophysical and spectroscopic properties of terbutaline in different solvents and under different acidic conditions. Theoretical calculations were also used to analyze the photophysical properties. It was found that terbutaline exhibits a characteristic absorption band in the range of 252-287 nm and two emission bands at 302 nm and 624 nm (f =0.114, =14.9 ns). The nature of solvent was found to affect significantly the position of these bands as well as the fluorescence quantum yield which was found to be rather high in polar solvents. The fluorescence intensity of the cationic species was significantly quenched in the presence of strong acids such as H2SO4 and HCl, although the absorption and excitation band shape remained unchanged. Both steady state and time resolved fluorescence measurements show that the fluorescence quenching of terbutaline by acids is a dynamic process with quenching rate constants, kq, equal to 1.5×10 and 1.02×10 in sulfuric...

Effect of Geometrical Isomerism of Cobalt(III) and Iron(III) Based Transition Metal Complexes on Kinetics of Oxidation of L-Cysteine

Zeitschrift fur Naturforschung B

Kinetics of Oxidation of L-Cysteine by Cobalt (III), Iron(III), and Chromium(III) Complexes of Salicylaldiminato Ligands

Kinetics of oxidation of L-cysteine by penta-coordinated Co (III), Fe(III), and Cr(III) complexes... more Kinetics of oxidation of L-cysteine by penta-coordinated Co (III), Fe(III), and Cr(III) complexes of salicylaldiminato ligands have been studied in aqueous solutions. Metal complexes of N-salicylidinecyclohexylamine, N-salicylidinisopropylaniline, N-salicylidinnaphthylamine, N-(4-sulfonitsalicylidine)cyclohexylamine, and N-(4-sulfonatesalicylidine)-2-isoprpylaniline were used in the studies. Measurements were run at constant temperature (25º C), constant ionic strength (0.20 M), and constant pH (7.0) under pseudo-first order conditions, in which the concentration of cysteine is around two orders of magnitude greater than that of metal complex. The observed rate constant was determined by following the change in absorbance of reaction mixture at a predetermined wavelength with time. Results show that the rate of oxidation depends on steric factor and the electron withdrawing / releasing ability of the ligand bound to the metal ion. It also depends on the metal center. The Co(III) com...

Kinetics of Oxidation of L-Cysteine by trans - and cis -Co III and Fe III Complexes based on α- and γ-Diimine Schiff Base Ligands

Zeitschrift für anorganische und allgemeine Chemie, 2010

Kinetics of oxidation of l-cysteine by Co III and Fe III complexes based on α-and γ-diimine Schif... more Kinetics of oxidation of l-cysteine by Co III and Fe III complexes based on α-and γ-diimine Schiff base ligands were studied in aqueous solution. Pairs of trans and cis isomers of the metal complexes were used in the studies. Kinetic measurements were performed at 25°C and constant pH and ionic strength under pseudo-first order condition, in which the concentration of cysteine was around two orders of magnitude greater than that of the metal complex. The observed rate constant was obtained by following the change in absorbance of

Removal of lead ions from aqueous solutions by insolubilized Iraqi humic acid

Humic acid from Adhamiya clay soil was extracted and converted to insolubilized humic acid (INaHA... more Humic acid from Adhamiya clay soil was extracted and converted to insolubilized humic acid (INaHA). It was characterized by Fourier-transform infrared spectroscopy, elemental analysis, thermal gravimetric analysis, X-ray diffraction, differential scanning calorimetry, and scanning electron microscopy. Adsorption of Pb(II) ions by INaHA was studied using the batch technique at different temperatures (25.0°C, 35.0°C and 45.0°C) and at different pH values (3.0, 4.0 and 5.0), The solutions adjusted to pH 4 were found to be the optimum media for the removal Pb(II) ions. Pseudo-secondorder kinetic model was used to understand the mechanism for adsorption, the maximum capacity of the uptake of lead ions was achieved after 24 h. The rate constant k2 of the pseudo-second-order sorption was used to calculate the activation energy (Ea) of (20.26 kJ/mol), which gives evidence that the physisorption process took place. Isotherm equilibrium models were investigated, Langmuir, Freundlich and Dubin...

Spectrophotometric method for determination of ranitidine hydrochloride in bulk and in pharmaceutical preparation using ninhydrin

European Journal of Chemistry

A simple, sensitive and reproducible method for the determination of ranitidine hydrochloride in ... more A simple, sensitive and reproducible method for the determination of ranitidine hydrochloride in pharmaceutical preparations was investigated. This spectrophotometric method was based on the formation of a deep red color product with ninhydrin in basic media and the absorbance measured at λmax = 480 nm. The reaction occurs at 45 °C with pH = 10 having a contact time of 38 minutes. Under the optimum conditions, Beer’s Law is obeyed in the concentration range of 8.98×103 - 9.90×104 µg/L. The coeﬃcient of correlation was found to be 0.999 for the obtained method with molar absorptivity of 3.05×103 L/mol.cm. The calculated Sandell’s sensitivity is 0.108 μg/cm2. The limit of detection and limit of quantification are 0.0997 and 0.3023 µg/mL, respectively. The low values of the percentage relative standard deviation and percentage relative error indicate the high precision and the good accuracy of the proposed method. The stoichiometry of the reaction is determined and found to be 1:4 (Ran...

Removal of Lead Ions from Waste Water Using Modified Jordanian Zeolite

Chemical Science International Journal

In this study a Jordanian Zeolite was modified using anionic surfactant which is sodium dodecyl s... more In this study a Jordanian Zeolite was modified using anionic surfactant which is sodium dodecyl sulfate (sodium dodecyl sulfate). The sorption of Pb(II) from synthetic wastewater by surfactant modified Zeolite (SMZ) was investigated as a function of temperature. The experimental data was analysed using isotherm models namely Langmuir, Freundlich, Redlich-Peterson and Temkin and kinetic models such as the pseudo- second-order, intraparticle diffusion and the Elovich models in order to understand the mechanism of the interaction between this SMZ and the lead ions. All the isotherm models showed good correlation with the experimental results but Freundlich was the best. The calculated DH was obtained using Langmuir constant (aL), its value of 8.29kJ/mol revealed that the type of sorption is physical oneThe values of RL at all temperatures reflect the favorability of this interaction. The calculated activation energy was 21.126 kJ/mol using the pseudo-second order constant (k2), which ...

Selective colorimetric molecular probe for cyanide ion detection in aqueous solution

European Journal of Chemistry

5-Nitro-2-hydroxybenzaldehyde (1) demonstrated to be a sensitive, and a selective molecular probe... more 5-Nitro-2-hydroxybenzaldehyde (1) demonstrated to be a sensitive, and a selective molecular probe for cyanide ion (CN-) in aqueous media. In acetonitrile, compound 1 shows sensitivity and selectivity for cyanide, acetate and fluoride, in comparison to other investigated anions using both visual and spectroscopic means. In aqueous solution, the color becomes intense yellow upon addition of cyanide, while acetate showed this effect to a much lower extent. Significant spectral changes were also detected with the appearance of two new absorption bands at 358 and 387 nm. This was accompanied by concomitant intensity decrease for the band at 314 nm. Fluoride, dihydrogen phosphate, chloride, bromide, perchlorate, and azide showed negligible color and spectral changes for the probe in aqueous solutions. On the other hand, hydrogen sulfate caused fainting of the yellow color and gave a spectrum similar to that of the sensor in polar aprotic solvents. The cyanide ion was detected at micro mol...

Studies of Oxyanion Removal from Aqueous Solution Using Zeolite and HDTMA-Br Surface Modified Organo-Zeolite

American Chemical Science Journal, 2016

Synthesis and characterization of metal 2-pyridine carboxaldehyde-N-methyl-N-2-pyridyl hydrazone complexes and their microbiological activity

Http Dx Doi Org 10 1080 0095897042000261890, Jan 25, 2007

ABSTRACT Complexes of Cu(II), Mn(II), Co(II), Ni(II), Hg(II), Cd(II) and Rh(III) with 2-pyridine ... more ABSTRACT Complexes of Cu(II), Mn(II), Co(II), Ni(II), Hg(II), Cd(II) and Rh(III) with 2-pyridine carboxaldehyde-N-methyl-N-2-pyridylhydrazone ( pamph) have been prepared and characterized. The new complexes have been characterized by elemental analysis, conductivity and magnetic measurements, IR, UV–vis and 1H NMR spectroscopic methods. The microbiological activity of the complexes was investigated against bacteria and fungi. Most of the complexes studied appear to be active against bacteria while all are active against fungi. The Cu, Cd and Hg complexes exhibit the highest activity against both bacteria and fungi.

Characterization for the interaction of nickel(II) and copper(II) from aqueous solutions with natural silicate minerals

Desalination, Aug 1, 2009

This paper describes the interaction and removal of some heavy metal ions such as Ni(II) and Cu(I... more This paper describes the interaction and removal of some heavy metal ions such as Ni(II) and Cu(II) from aqueous solution at constant pH (6.0) and 0.01 M NaClO 4 ionic strength using raw clay mineral. The experimental results were analysed in terms of Langmuir, Freundlich and Redlich-Peterson isotherms to obtain the characteristic parameters of each model. Both the Langmuir and Redlich-Peterson isotherms were found to represent the measured sorption data. The Langmuir monolayer adsorption capacity was found to range from 48.54 to 60.98 and 58.48 to 69.93 mg metal ion/g clay for Ni(II) and Cu(II) respectively. Also thermodynamic parameters such as enthalpy (ΔH), free energy (ΔG) and entropy (ΔS) were calculated and these values show that adsorption of heavy metal ions on clay was an endothermic, entropically driven with very favorable entropy and spontaneous process. The values of ΔG indicate that the adsorption is characterized by physical adsorption. According to the equilibrium studies, the selectivity sequence can be given as Cu(II) > Ni(II). These results show that natural clay holds great potential to remove cationic heavy metal species from aqueous solutions.

Isothermal and kinetic adsorption behaviour of Pb2+ ions on natural silicate minerals

Clay Minerals, Dec 1, 2003

Four different types of natural clay were tested as potential adsorbents for toxic Pb2+ ions. Bas... more Four different types of natural clay were tested as potential adsorbents for toxic Pb2+ ions. Based on the preliminary screening studies, the adsorbents were effective at retaining Pb2+ ions from solution. A strong correlation was observed between the cation exchange capacity of clay samples and their function as adsorbents of Pb2+ ions. An adsorption isotherm of Pb ions on Petra clay was measured at 30ºC and at a concentration range of 0 –200 mg dm–3. Over the entire concentration range, the Langmuir isotherm gave a good representation of adsorption data, which confirms the formation of one molecular layer of adsorbate on the clay surface. Two variables were investigated to elucidate the rate-limiting steps of adsorption: the effect of initial concentration of Pb2+ and the effect of solution temperature. It is concluded that external diffusion was the only mechanism in operation in the adsorption process. It has been noted that adsorption of Pb2+ by natural clay is a fast process, where 80% of equilibrium capacity was established within the first minutes of interaction.

Determination of Antimony trioxide from the back coated textile preparation

Eurasian Journal of Analytical Chemistry, Aug 7, 2014

Determination of phenol in wastewater by using low cost modified Jordanian natural zeolite: Column and batch experiment

Eurasian Journal of Analytical Chemistry, Oct 21, 2012

Study on removal behavior and separation efficiency of naturally occurring bentonite for sulfate from water by continuous column and batch methods

European Journal of Chemistry, 2015

Evaluation of Jordanian treated natural zeolite for the uptake of p-nitrophenol from wastewater by continuous column method

Desalination and Water Treatment, 2014

Principles of interaction of ammonium ion with natural Jordanian deposits: Analysis of uptake studies

Desalination, 2010

Isothermal and kinetic adsorption behaviour of Pb<SUP>2+</SUP> ions on natural silicate minerals

Clay Minerals, 2003

Four different types of natural clay were tested as potential adsorbents for toxic Pb2+ ions. Bas... more Four different types of natural clay were tested as potential adsorbents for toxic Pb2+ ions. Based on the preliminary screening studies, the adsorbents were effective at retaining Pb2+ ions from solution. A strong correlation was observed between the cation exchange capacity of clay samples and their function as adsorbents of Pb2+ ions. An adsorption isotherm of Pb ions on Petra clay was measured at 30ºC and at a concentration range of 0 –200 mg dm–3. Over the entire concentration range, the Langmuir isotherm gave a good representation of adsorption data, which confirms the formation of one molecular layer of adsorbate on the clay surface. Two variables were investigated to elucidate the rate-limiting steps of adsorption: the effect of initial concentration of Pb2+ and the effect of solution temperature. It is concluded that external diffusion was the only mechanism in operation in the adsorption process. It has been noted that adsorption of Pb2+ by natural clay is a fast process, ...

Spectrophotometric Method for Determination of Chromium Ion in Aqueous Solution Using Ninhydrin

American Journal of Analytical Chemistry, 2022

A simple, precise, inexpensive and reproducible spectrophotometric method was investigated for th... more A simple, precise, inexpensive and reproducible spectrophotometric method was investigated for the determination of chromium ion (III) in aqueous media, this method based on the formation of a complex between chromium ion (III) and ninhydrin, a deep greenish-violet colored product in the presence of potassium hydroxide was obtained. The absorption of this product was measured at λ max = 375 nm. The reaction proceeds quantitatively at room temperature. The linear calibration curve was constructed over range of (4.8 × 10 −4-1.6 × 10 −2) mol/L of chromium ions with molar absorptivity of 2.90 × 10 2 and correlation coefficient R 2 = 0.9989. The calculated Sandell's sensitivity value is 0.179 µg/cm 2 , the limits of detection (LOD) and the limit of quantification (LOQ) are found to be 3.74 × 10 −5 and 1.24 × 10 −4 mol/L, respectively. The method was successfully applied for determination of the chromium ion in aqueous solution. The stoichiometry of the reactions was determined molar combining ratio of 1:2 between chromium and ninhydrin.

Effects of pH and Temperature on the Interaction of Pb(II) with Azraq Humic Acid Studied with Schubert's Ion Exchange Method

The binding of Pb(II) to humic acid extracted from the Azraq Oasis was studied. The influence of ... more The binding of Pb(II) to humic acid extracted from the Azraq Oasis was studied. The influence of temperature and pH was investigated at a constant ionic strength of 0.1. This analysis was done using Schubert's ion-exchange equilibrium method and its modified version. The data showed temperature and pH dependence. The derived conditional stability constants (log βn) for 1:1 and 1:2 lead-humate complexes were determined. It was noticed that the conditional stability constant (log β1) increased with increasing pH and temperature. The derived constants and their temperature dependences were used to calculate the corresponding thermodynamic parameters ΔG, ΔH and ΔS. The results indicate that the stability of these complexes derives from a very favorable entropy increase. Permanent URL: http://hdl.handle.net/2047/d10006126

Spectroscopic and photophysical properties of terbutaline

In this paper, we report the photophysical and spectroscopic properties of terbutaline in differe... more In this paper, we report the photophysical and spectroscopic properties of terbutaline in different solvents and under different acidic conditions. Theoretical calculations were also used to analyze the photophysical properties. It was found that terbutaline exhibits a characteristic absorption band in the range of 252-287 nm and two emission bands at 302 nm and 624 nm (f =0.114, =14.9 ns). The nature of solvent was found to affect significantly the position of these bands as well as the fluorescence quantum yield which was found to be rather high in polar solvents. The fluorescence intensity of the cationic species was significantly quenched in the presence of strong acids such as H2SO4 and HCl, although the absorption and excitation band shape remained unchanged. Both steady state and time resolved fluorescence measurements show that the fluorescence quenching of terbutaline by acids is a dynamic process with quenching rate constants, kq, equal to 1.5×10 and 1.02×10 in sulfuric...

Effect of Geometrical Isomerism of Cobalt(III) and Iron(III) Based Transition Metal Complexes on Kinetics of Oxidation of L-Cysteine

Zeitschrift fur Naturforschung B

Kinetics of Oxidation of L-Cysteine by Cobalt (III), Iron(III), and Chromium(III) Complexes of Salicylaldiminato Ligands

Kinetics of oxidation of L-cysteine by penta-coordinated Co (III), Fe(III), and Cr(III) complexes... more Kinetics of oxidation of L-cysteine by penta-coordinated Co (III), Fe(III), and Cr(III) complexes of salicylaldiminato ligands have been studied in aqueous solutions. Metal complexes of N-salicylidinecyclohexylamine, N-salicylidinisopropylaniline, N-salicylidinnaphthylamine, N-(4-sulfonitsalicylidine)cyclohexylamine, and N-(4-sulfonatesalicylidine)-2-isoprpylaniline were used in the studies. Measurements were run at constant temperature (25º C), constant ionic strength (0.20 M), and constant pH (7.0) under pseudo-first order conditions, in which the concentration of cysteine is around two orders of magnitude greater than that of metal complex. The observed rate constant was determined by following the change in absorbance of reaction mixture at a predetermined wavelength with time. Results show that the rate of oxidation depends on steric factor and the electron withdrawing / releasing ability of the ligand bound to the metal ion. It also depends on the metal center. The Co(III) com...

Kinetics of Oxidation of L-Cysteine by trans - and cis -Co III and Fe III Complexes based on α- and γ-Diimine Schiff Base Ligands

Zeitschrift für anorganische und allgemeine Chemie, 2010

Kinetics of oxidation of l-cysteine by Co III and Fe III complexes based on α-and γ-diimine Schif... more Kinetics of oxidation of l-cysteine by Co III and Fe III complexes based on α-and γ-diimine Schiff base ligands were studied in aqueous solution. Pairs of trans and cis isomers of the metal complexes were used in the studies. Kinetic measurements were performed at 25°C and constant pH and ionic strength under pseudo-first order condition, in which the concentration of cysteine was around two orders of magnitude greater than that of the metal complex. The observed rate constant was obtained by following the change in absorbance of

Removal of lead ions from aqueous solutions by insolubilized Iraqi humic acid

Humic acid from Adhamiya clay soil was extracted and converted to insolubilized humic acid (INaHA... more Humic acid from Adhamiya clay soil was extracted and converted to insolubilized humic acid (INaHA). It was characterized by Fourier-transform infrared spectroscopy, elemental analysis, thermal gravimetric analysis, X-ray diffraction, differential scanning calorimetry, and scanning electron microscopy. Adsorption of Pb(II) ions by INaHA was studied using the batch technique at different temperatures (25.0°C, 35.0°C and 45.0°C) and at different pH values (3.0, 4.0 and 5.0), The solutions adjusted to pH 4 were found to be the optimum media for the removal Pb(II) ions. Pseudo-secondorder kinetic model was used to understand the mechanism for adsorption, the maximum capacity of the uptake of lead ions was achieved after 24 h. The rate constant k2 of the pseudo-second-order sorption was used to calculate the activation energy (Ea) of (20.26 kJ/mol), which gives evidence that the physisorption process took place. Isotherm equilibrium models were investigated, Langmuir, Freundlich and Dubin...

Spectrophotometric method for determination of ranitidine hydrochloride in bulk and in pharmaceutical preparation using ninhydrin

European Journal of Chemistry

A simple, sensitive and reproducible method for the determination of ranitidine hydrochloride in ... more A simple, sensitive and reproducible method for the determination of ranitidine hydrochloride in pharmaceutical preparations was investigated. This spectrophotometric method was based on the formation of a deep red color product with ninhydrin in basic media and the absorbance measured at λmax = 480 nm. The reaction occurs at 45 °C with pH = 10 having a contact time of 38 minutes. Under the optimum conditions, Beer’s Law is obeyed in the concentration range of 8.98×103 - 9.90×104 µg/L. The coeﬃcient of correlation was found to be 0.999 for the obtained method with molar absorptivity of 3.05×103 L/mol.cm. The calculated Sandell’s sensitivity is 0.108 μg/cm2. The limit of detection and limit of quantification are 0.0997 and 0.3023 µg/mL, respectively. The low values of the percentage relative standard deviation and percentage relative error indicate the high precision and the good accuracy of the proposed method. The stoichiometry of the reaction is determined and found to be 1:4 (Ran...

Removal of Lead Ions from Waste Water Using Modified Jordanian Zeolite

Chemical Science International Journal

In this study a Jordanian Zeolite was modified using anionic surfactant which is sodium dodecyl s... more In this study a Jordanian Zeolite was modified using anionic surfactant which is sodium dodecyl sulfate (sodium dodecyl sulfate). The sorption of Pb(II) from synthetic wastewater by surfactant modified Zeolite (SMZ) was investigated as a function of temperature. The experimental data was analysed using isotherm models namely Langmuir, Freundlich, Redlich-Peterson and Temkin and kinetic models such as the pseudo- second-order, intraparticle diffusion and the Elovich models in order to understand the mechanism of the interaction between this SMZ and the lead ions. All the isotherm models showed good correlation with the experimental results but Freundlich was the best. The calculated DH was obtained using Langmuir constant (aL), its value of 8.29kJ/mol revealed that the type of sorption is physical oneThe values of RL at all temperatures reflect the favorability of this interaction. The calculated activation energy was 21.126 kJ/mol using the pseudo-second order constant (k2), which ...

Selective colorimetric molecular probe for cyanide ion detection in aqueous solution

European Journal of Chemistry

5-Nitro-2-hydroxybenzaldehyde (1) demonstrated to be a sensitive, and a selective molecular probe... more 5-Nitro-2-hydroxybenzaldehyde (1) demonstrated to be a sensitive, and a selective molecular probe for cyanide ion (CN-) in aqueous media. In acetonitrile, compound 1 shows sensitivity and selectivity for cyanide, acetate and fluoride, in comparison to other investigated anions using both visual and spectroscopic means. In aqueous solution, the color becomes intense yellow upon addition of cyanide, while acetate showed this effect to a much lower extent. Significant spectral changes were also detected with the appearance of two new absorption bands at 358 and 387 nm. This was accompanied by concomitant intensity decrease for the band at 314 nm. Fluoride, dihydrogen phosphate, chloride, bromide, perchlorate, and azide showed negligible color and spectral changes for the probe in aqueous solutions. On the other hand, hydrogen sulfate caused fainting of the yellow color and gave a spectrum similar to that of the sensor in polar aprotic solvents. The cyanide ion was detected at micro mol...

Studies of Oxyanion Removal from Aqueous Solution Using Zeolite and HDTMA-Br Surface Modified Organo-Zeolite

American Chemical Science Journal, 2016

Synthesis and characterization of metal 2-pyridine carboxaldehyde-N-methyl-N-2-pyridyl hydrazone complexes and their microbiological activity

Http Dx Doi Org 10 1080 0095897042000261890, Jan 25, 2007

ABSTRACT Complexes of Cu(II), Mn(II), Co(II), Ni(II), Hg(II), Cd(II) and Rh(III) with 2-pyridine ... more ABSTRACT Complexes of Cu(II), Mn(II), Co(II), Ni(II), Hg(II), Cd(II) and Rh(III) with 2-pyridine carboxaldehyde-N-methyl-N-2-pyridylhydrazone ( pamph) have been prepared and characterized. The new complexes have been characterized by elemental analysis, conductivity and magnetic measurements, IR, UV–vis and 1H NMR spectroscopic methods. The microbiological activity of the complexes was investigated against bacteria and fungi. Most of the complexes studied appear to be active against bacteria while all are active against fungi. The Cu, Cd and Hg complexes exhibit the highest activity against both bacteria and fungi.

Characterization for the interaction of nickel(II) and copper(II) from aqueous solutions with natural silicate minerals

Desalination, Aug 1, 2009

This paper describes the interaction and removal of some heavy metal ions such as Ni(II) and Cu(I... more This paper describes the interaction and removal of some heavy metal ions such as Ni(II) and Cu(II) from aqueous solution at constant pH (6.0) and 0.01 M NaClO 4 ionic strength using raw clay mineral. The experimental results were analysed in terms of Langmuir, Freundlich and Redlich-Peterson isotherms to obtain the characteristic parameters of each model. Both the Langmuir and Redlich-Peterson isotherms were found to represent the measured sorption data. The Langmuir monolayer adsorption capacity was found to range from 48.54 to 60.98 and 58.48 to 69.93 mg metal ion/g clay for Ni(II) and Cu(II) respectively. Also thermodynamic parameters such as enthalpy (ΔH), free energy (ΔG) and entropy (ΔS) were calculated and these values show that adsorption of heavy metal ions on clay was an endothermic, entropically driven with very favorable entropy and spontaneous process. The values of ΔG indicate that the adsorption is characterized by physical adsorption. According to the equilibrium studies, the selectivity sequence can be given as Cu(II) > Ni(II). These results show that natural clay holds great potential to remove cationic heavy metal species from aqueous solutions.

Isothermal and kinetic adsorption behaviour of Pb2+ ions on natural silicate minerals

Clay Minerals, Dec 1, 2003

Four different types of natural clay were tested as potential adsorbents for toxic Pb2+ ions. Bas... more Four different types of natural clay were tested as potential adsorbents for toxic Pb2+ ions. Based on the preliminary screening studies, the adsorbents were effective at retaining Pb2+ ions from solution. A strong correlation was observed between the cation exchange capacity of clay samples and their function as adsorbents of Pb2+ ions. An adsorption isotherm of Pb ions on Petra clay was measured at 30ºC and at a concentration range of 0 –200 mg dm–3. Over the entire concentration range, the Langmuir isotherm gave a good representation of adsorption data, which confirms the formation of one molecular layer of adsorbate on the clay surface. Two variables were investigated to elucidate the rate-limiting steps of adsorption: the effect of initial concentration of Pb2+ and the effect of solution temperature. It is concluded that external diffusion was the only mechanism in operation in the adsorption process. It has been noted that adsorption of Pb2+ by natural clay is a fast process, where 80% of equilibrium capacity was established within the first minutes of interaction.

Determination of Antimony trioxide from the back coated textile preparation

Eurasian Journal of Analytical Chemistry, Aug 7, 2014

Determination of phenol in wastewater by using low cost modified Jordanian natural zeolite: Column and batch experiment

Eurasian Journal of Analytical Chemistry, Oct 21, 2012

Study on removal behavior and separation efficiency of naturally occurring bentonite for sulfate from water by continuous column and batch methods

European Journal of Chemistry, 2015

Evaluation of Jordanian treated natural zeolite for the uptake of p-nitrophenol from wastewater by continuous column method

Desalination and Water Treatment, 2014

Principles of interaction of ammonium ion with natural Jordanian deposits: Analysis of uptake studies

Desalination, 2010

Isothermal and kinetic adsorption behaviour of Pb<SUP>2+</SUP> ions on natural silicate minerals

Clay Minerals, 2003

Four different types of natural clay were tested as potential adsorbents for toxic Pb2+ ions. Bas... more Four different types of natural clay were tested as potential adsorbents for toxic Pb2+ ions. Based on the preliminary screening studies, the adsorbents were effective at retaining Pb2+ ions from solution. A strong correlation was observed between the cation exchange capacity of clay samples and their function as adsorbents of Pb2+ ions. An adsorption isotherm of Pb ions on Petra clay was measured at 30ºC and at a concentration range of 0 –200 mg dm–3. Over the entire concentration range, the Langmuir isotherm gave a good representation of adsorption data, which confirms the formation of one molecular layer of adsorbate on the clay surface. Two variables were investigated to elucidate the rate-limiting steps of adsorption: the effect of initial concentration of Pb2+ and the effect of solution temperature. It is concluded that external diffusion was the only mechanism in operation in the adsorption process. It has been noted that adsorption of Pb2+ by natural clay is a fast process, ...