Jairo Tronto

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Professor Dr Christopher Preece

Abu Dhabi University

Ahmed A Abdala

Texas A&M University

Sujit Sen

National Institute of Technology Rourkela

Ehsan Houshfar

University of Tehran

Dr. Utku Bulut Simsek

Bogazici University

Mudzofar Sofyan

Diponegoro University

Inam Bhatti

Mehran University of Engineering and Technology

Ayodele Olumide

University of Malaya, Malaysia

Gerard Hawkins

Manuel J Lis

Universitat Politecnica de Catalunya

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Papers by Jairo Tronto

Comparação do comportamento de hidróxidos duplos lamelares de Zn-Al e Ni-Al intercalados com ânions benzoato e tereftalato: estudo eletroquímico

Livro de Resumos, 2005

Potential of Alginate and Mesoporous Carbon to Improve the Fertilizer Value of Urea

Communications in Soil Science and Plant Analysis, Sep 24, 2020

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Estudo da adsorção de tereftalato de sódio em hidróxidos duplos lamelares

Livro de Resumos, 1997

Compostos orgânicos de interesse farmacêutico intercalados em hidróxidos duplos lamelares: síntese, caracterização e estudo da liberação in vitro

Bone Char: Synthesis, Characterization, and Agronomic Application as an Alternative Source of Phosphorus

Alternative materials can be used to reduce reliance on mining for P-based fertilizers. In this s... more Alternative materials can be used to reduce reliance on mining for P-based fertilizers. In this sense, the pyrolysis process of bovine bones can produce a product called “bone char”, which can be used as a source of P. The present work aims to synthesize, characterize, and evaluate the solubility of fertilizers extractants using bone char, Bayóvar, and triple superphosphate; to evaluate the ‘‘in vitro’’ release of P; to investigate the availability of P from the fertilizers in consecutive cultivations of maize and black-oat. The characterization of the bone char was performed by X-ray diffraction (XRD), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), and scanning electron microscopy coupled with energy-dispersive (SEM-EDS). The XRD analyses have shown the presence of hydroxyapatite in the bone char, bands assigned to P-O stretching from phosphate have been observed in ATR-FTIR, and Ca, P, C, and O elements were identified in the materials by EDS anal...

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Effect of pH, ionic strength, and temperature on the adsorption behavior of Acid Blue 113 onto mesoporous carbon

Environmental Science and Pollution Research

Análise termogravimétrica 'RuCl ind. 3''nH ind. 2'O

Livro de Resumos, 2001

Ionic adsorption and characterization of biochar from discarded potatoes

Bragantia, 2022

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Sorção de aminoácidos em hidróxidos duplos lamelares: regeneração a partir de um precursor calcinado

Estudo da adsorção de ânions glutamato em hidróxidos duplos lamelares de magnésio e alumínio contendo carbonato

Estudo da adsorção de tereftalato de sódio em hidróxidos duplos lamelares

A flow injection procedure using Layered Double Hydroxide for on line pre-concentration of fluoride

Talanta, 2018

This work showed a flow system designed with solenoid valves for preconcentration of fluoride usi... more This work showed a flow system designed with solenoid valves for preconcentration of fluoride using SPADNS method in water samples. The analyte was preconcentrated in a mini-column coated with Layered Double Hydroxides (LDH) used as adsorbent. Then, the fluoride ions were eluted with 0.5 mol L -1 sodium hydroxide and determined by spectrophotometry. The variables that affect the system such adsorbent mass, type of eluent, solutions flow rate, reagent concentration and pH effect were critically evaluated. Under optimized conditions, the detection limit, coefficient of variation, linear range and preconcentration factor were estimated at 15 µg L -1 (99.7% confidence level), 0.8% (500 µg L -1 , n = 10), 50-500 µg L -1 and 10, respectively. The accuracy of the method was evaluated by analysis of ALPHA APS 1076 (Simulated Rain Water) certified material, the values were not significantly different at a 95% level of confidence. The method was applied for fluoride determination in water samples and the levels found were below the maximum values established by Brazilian environmental and health legislations.

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Layered Double Hydroxides as Hosting Matrices for Storage and Slow Release of Phosphate Analyzed by Stirred-Flow Method

Materials Research, 2018

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Mesoporous carbon derived from a biopolymer and a clay: Preparation, characterization and application for an organochlorine pesticide adsorption

Microporous and Mesoporous Materials, 2016

Abstract The production of carbon-based materials is a field of intense scientific research due t... more Abstract The production of carbon-based materials is a field of intense scientific research due to the diversity of potential applications that this kind of material presents. In this paper, it is reported the synthesis of porous carbonaceous material (PCM) based on the pyrolysis at 850 °C of a composite made of Laponite (commercially available synthetic clay) and Cassava starch, followed by clay removal through acid digestion. The Laponite presence influenced the structural order and textural properties of the pyrolytic carbon formed. After pyrolysis and acid digestion of clay, it was obtained a material with a partial graphitic structure containing majorly sp 2 bounded carbon atoms, that has almost twice the specific surface area and up to 20 times more mesopore volume than the carbonaceous material obtained without the clay. The adsorbent potential of PCM was evaluated by adsorption of Dicamba, an organochlorine pesticide, from aqueous solutions. The PCM exhibits a high Dicamba removal efficiency, with a maximum adsorption capacity of 251.9 mg g −1 related to a pseudo-second-order kinetic adsorption model with a strong pH dependence.

Biochar from carrot residues chemically modified with magnesium for removing phosphorus from aqueous solution

Journal of Cleaner Production, 2019

The continuous increase in the world population requires more agricultural production; therefore,... more The continuous increase in the world population requires more agricultural production; therefore, phosphorus compounds (P) are essentials. Considering that P reserves are finite, studying its recycling and reusing is essential. Biochar made from agricultural residues is an interesting material to be studied for P recovery and reuse in agriculture. This study shows the preparation and characterization of a biochar obtained from the pyrolysis of carrot residue for P adsorption studies in aqueous solution. Carrot was pyrolyzed at different temperatures values, with and without pretreatment with MgCl 2. Biochar impregnated with Mg and pyrolyzed at 400°C showed higher efficiency in P removal in aqueous solution (138 mg g-1). The characterization techniques indicated that after P adsorption by biochar, a chemical reaction occurred between Mg and P species with formation of Mg(H 2 PO 4) 2. The biochar from carrot residue obtained in this work is a promising adsorbent for P recycling and has potential to be used as soil fertilizer.

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Synthesis, characterization and electrochemical study of layered double hydroxides intercalated with 2-thiophenecarboxylate anions

Journal of Physics and Chemistry of Solids, Mar 1, 2004

The synthesis, characterization, and electrochemical study of the Zn(II)–Al(III) and Zn(II)–Cr(II... more The synthesis, characterization, and electrochemical study of the Zn(II)–Al(III) and Zn(II)–Cr(III) Layered Double Hydroxides (LDHs) containing 2-thiopenecarboxylate as the interlayer anions are described. The LDHs were prepared by the constant pH coprecipitation technique followed by hydrothermal treatment for 72 h. The materials were analyzed by PXRD, FT-IR, 13C CP-MAS, EDX, TEM, and CV. The presence of the organic heterocyclic anions

Cellulose Acetate Film and Layered Double Hydroxide as Determination Method of Available Phosphorus in the Soil

Journal of Agricultural Science and Technology B, 2018

The determination of available phosphorus (P) in soil is essential to the evaluation of the curre... more The determination of available phosphorus (P) in soil is essential to the evaluation of the current fertility status, and therefore, for recommending the required phosphate fertilizers for the cultivation of crops. The mostly used extractants around the country are Mehlich-1 (M-1) and anionic resins (AR) and mixed resins (MR). However, there are still controversies in relation to the method that should be used, due to of particularities of each extractor. Therefore, the main objectives of this work was to assess the applicability of films of binary combination between cellulose acetate (CA) biopolymer and calcinated layered double hydroxide (LDH-c), named CAF-LDH-c, as a new extractor of available P in soils. For this, two experiments were set out. In the first one, sub-samples of an Oxisol layer 0-20 cm were used and submitted to increasing doses of total P (0, 250, 750 and 2,250 mg/dm 3) in the form of monoammonium phosphate (MAP) at different incubation time (5, 30, 60 and 90 d). In the second experiment, samples of 20 soils from different origins and contents of available P were used with distinct chemical and physical attributes. The analysis of available P by M-1, AR, MR, Mehlich-3 (M-3) and CAF-LDH-c extractants was done in both experiments. The efficiency of the extractants was evaluated by Pearson's linear correlation. The correlation between values of P extracted from soil in the first experiment was highly significant among all extraction methods used, including for CAF-LDH-c. In the second experiment, CAF-LDH-c showed significant correlation (p < 0.01) with M-1, M-3, AR and MR. Thus, the significant correlations of the extractant being tested (CAF-LDH-c) with those usually used indicates the possibility of this new method of routine laboratories for assessing the P availability of for the cultivation of crops.

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Plant growth regulation by seed coating with films of alginate and auxin-intercalated layered double hydroxides

Beilstein Journal of Nanotechnology, 2020

Auxins are a class of organic substances known as plant-growth regulators, which act on plant phy... more Auxins are a class of organic substances known as plant-growth regulators, which act on plant physiology, promoting its full development. However, due to the great instability of these substances among the diversity of crops and cultivation environments, it is necessary to seek more efficient modes of application, which lead to a homogeneous distribution and promote a sustained release according to the plants demand. Seed coating, using films containing a biodegradable polymer and auxins intercalated into layered compounds, emerges as a very promising approach to a new form of growth regulator application. Thus, the presented work had three aims: (i) the synthesis and characterization of an organic–inorganic hybrid material containing a layered double hydroxide (LDH) of zinc and aluminum and the synthetic auxin 1-naphthalenoacetic acid (ZnAl-NAA-LDH), (ii) the coating of bean seeds (Phaseolus vulgaris L.) with composite films produced from mixtures of alginate polymer and ZnAl-NAA-L...

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The buffer effect of Mg and Al LDHs intercalated with amino acids

European Journal of Pharmaceutical Sciences, 2001

$Research paper thumbnail of Ab initio study of complex defects and optical transitions in MgAl$_{2}$O$_{4}$$

Ab initio study of complex defects and optical transitions in MgAl$_{2}$O$_{4}$

Bulletin of the American Physical Society, 2015