Synthesis of cassava starch biopolymer composed with zeolite for the treatment of herbicides contaminated water
DOI:
https://doi.org/10.6008/CBPC2179-6858.2023.002.0005Keywords:
Biofilm, Cassava starch, Zeolite, Glyphosate, AdsorptionAbstract
The exacerbated consumption of agrochemicals and the inadequate disposal of pesticide residues has configured many environmental problems, mainly directed to water contamination. In this perspective, zeolites have been promising in adsorption processes because they have a high and selective adsorption capacity, becoming an alternative to this problem. In addition, some configurations of biopolymers have been used in the adsorption of microcontaminants from water, as they have specific features such as biocompatibility, hydrophilicity, polycationic characteristics in an acid medium and the ability to form hydrogen bonds and Van der Walls interactions with the molecules of some contaminants. Thus, in this study, the hybrid compound formed by a biopolymer produced from cassava starch and Beta zeolite was synthesized and characterized, with the purpose of being applied in the adsorption of the glyphosate herbicide. Therefore, in order to verify the crystalline polymorphic phases of Beta zeolite, the X-Ray Diffraction (XRD) method was used. Thermal properties were analyzed using thermogravimetric analysis and differential thermogravimetric analysis. The hydrophilic properties were investigated by studying the degree of swelling of the formed hybrid. Finally, adsorption tests of the glyphosate herbicide were carried out and the removal percentages were determined using the Ion Chromatography (IC) technique. The results of the experiments carried out showed that the biofilm forms a flexible and resistant material to the aqueous medium when immersed for 24 h. It was observed that the hybrid Zeolite Biopolymer has selective adsorptive characteristics for glyphosate, as it presented removal values of 26% to 63% in solutions with glyphosate concentration of 30 to 50 mg.mL-1. Therefore, the hybrid biomaterial indicated significant application in the adsorption of microcontaminants, such as glyphosate herbicide, allowing new possibilities in the fields of adsorption and environmental protection.
Downloads
Downloads
Published
Issue
Section
License
Copyright (c) 2023 Ibero-American Journal of Environmental Sciences
![Creative Commons License](http://i.creativecommons.org/l/by-nc-nd/4.0/88x31.png)
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
The CBPC - Companhia Brasileira de Produção Científica (Brazil CNPJ: 11.221.422/0001-03) the material rights of the published works. The rights relate to the publication of the work anywhere in the world, including rights to renewals, expansions and dissemination of the contribution, as well as other subsidiary rights. All electronically published works may subsequently be published in printed collections under the coordination of this company and / or its partners. The authors preserve the copyright, but are not allowed to publish the contribution in another medium, printed or digital, in Portuguese or in translation.