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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Removal of glyphosate herbicide from water using biopolymer membranes

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Author(s):
Carneiro, Rafael T. A. [1] ; Taketa, Thiago B. [2] ; Gomes Neto, Reginaldo J. [2] ; Oliveira, Jhones L. [1] ; Campos, Estefania V. R. [1, 3] ; de Moraes, Mariana A. [4, 2] ; da Silva, Camila M. G. [3] ; Beppu, Marisa M. [2] ; Fraceto, Leonardo F. [1]
Total Authors: 9
Affiliation:
[1] Univ Estadual Paulista, Dept Engn Ambiental, UNESP, BR-18087180 Sorocaba, SP - Brazil
[2] Univ Estadual Campinas, UNICAMP, Fac Engn Quim, Dept Engn Mat & Bioproc, Campinas, SP - Brazil
[3] Univ Estadual Campinas, Inst Biol, Dept Bioquim, UNICAMP, Campinas, SP - Brazil
[4] Univ Fed Sao Paulo Unifesp, Dept Ciencias Exatas & Terra, Diadema, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Journal of Environmental Management; v. 151, p. 353-360, MAR 15 2015.
Web of Science Citations: 32
Abstract

Enormous amounts of pesticides are manufactured and used worldwide, some of which reach soils and aquatic systems. Glyphosate is a non-selective herbicide that is effective against all types of weeds and has been used for many years. It can therefore be found as a contaminant in water, and procedures are required for its removal. This work investigates the use of biopolymeric membranes prepared with chitosan (CS), alginate (AG), and a chitosan/alginate combination (CS/AG) for the adsorption of glyphosate present in water samples. The adsorption of glyphosate by the different membranes was investigated using the pseudo-first order and pseudo-second order kinetic models, as well as the Langmuir and Freundlich isotherm models. The membranes were characterized regarding membrane solubility, swelling, mechanical, chemical and morphological properties. The results of kinetics experiments showed that adsorption equilibrium was reached within 4 h and that the CS membrane presented the best adsorption (10.88 mg of glyphosate/g of membrane), followed by the CS/AG bilayer (8.70 mg of glyphosate/g of membrane). The AG membrane did not show any adsorption capacity for this herbicide. The pseudo-second order model provided good fits to the glyphosate adsorption data on CS and CS/AG membranes, with high correlation coefficient values. Glyphosate adsorption by the membranes could be fitted by the Freundlich isotherm model. There was a high affinity between glyphosate and the CS membrane and moderate affinity in the case of the CS/AG membrane. Physico-chemical characterization of the membranes showed low values of solubility in water, indicating that the membranes are stable and not soluble in water. The SEM and AFM analysis showed evidence of the presence of glyphosate on CS membranes and on chitosan face on CS/AG membranes. The results showed that the glyphosate herbicide can be adsorbed by chitosan membranes and the proposed membrane-based methodology was successfully used to treat a water sample contaminated with glyphosate. Biopolymer membranes therefore potentially offer a versatile method to eliminate agricultural chemicals from water supplies. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 13/05135-1 - Nanostructured antimicrobial coatings containing chitosan produced by self-assembly technique (layer-by-layer) for textile substrates
Grantee:Thiago Bezerra Taketa
Support Opportunities: Scholarships in Brazil - Doctorate