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Licensed Unlicensed Requires Authentication Published by De Gruyter June 27, 2023

pH dependence of glyphosate adsorption from aqueous solution using a cationic cellulose microfibers (cCMF) biosorbent

  • Maria Vitória Guimarães Leal , Andressa Silva Gomes , Gabrieli Roefero Tolosa , Guilherme Dognani EMAIL logo and Aldo Eloizo Job


Currently, the agricultural sector is responsible for the contamination of groundwater and springs due to the excessive use of pesticides, which represents a risk to human and environmental health. Among pesticides, glyphosate is the most used herbicide to increase agricultural production, however, it can cause intoxication in humans and has been classified as a potentially carcinogenic agent. Alternatives for removing these contaminants from water have been studied and discussed, including biosorption, a physical-chemical process that removes substances from solutions using a natural and renewable material. In this sense, this work studied the process to obtain cationic cellulose microfibers (cCMF) from sugarcane bagasse residue, by cellulose isolation followed by cationization reaction with Girard T reagent to promote a new adsorbent for glyphosate removal from water. It was observed that cCMF structure maintains the fibrillar morphology after the microfiber production (1.375 mmol g−1 oxidation degree). Results of zero charge of cCMF microfibers showed an isoelectric point pH = 5.4 ± 0.016 and the highest adsorption capacity was reached at pH 14 (59.21 %), showing a clear pH dependence on the adsorption process. Thereby, the cCMF can be produced from sugarcane bagasse residue being applied as a potential biomaterial for removing organic compounds from water.

Corresponding author: Guilherme Dognani, São Paulo State University, School of Technology and Sciences (FCT/UNESP), 19060-080, Presidente Prudente, SP, Brazil, e-mail:
Article note: A collection of invited papers based on presentations at the 30th International Carbohydrate Symposium (ICS-30), which was held in Brazil, 10-15 July 2022.

Funding source: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Award Identifier / Grant number: 001

Funding source: Fundação de Amparo à Pesquisa do Estado de São Paulo

Award Identifier / Grant number: 2014/50869-6

Award Identifier / Grant number: 2020/06577-1

Award Identifier / Grant number: 2021/09773-9


The authors would like to thank FAPESP-Brazil (Sao Paulo Research Foundation) [grant number 2014/50869-6, 2020/06577-1 and 2021/09773-9] and the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brazil (CAPES) [Finance Code 001] for the financial support. We would also like to thank LabMMEV-FCT/UNESP for the SEM images.

  1. Author Contribution: Conceptualization: MVGL, ASG, GRT, GD, AEJ; Methodology: MVGL, ASG, GRT, GD, AEJ; Validation: MVGL, ASG, GRT, GD, AEJ; Formal Analysis: MVGL, ASG, GRT, GD, AEJ; Investigation: MVGL, ASG, GRT, GD, AEJ; Resources: MVGL, GD, AEJ; Writing Original: MVGL, ASG, GRT, GD; Writing Review & Editing: MVGL, ASG, GRT, GD, AEJ; Supervision: GD, AEJ; Funding acquisition: MVGL, GD, AEJ.


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Supplementary Material

This article contains supplementary material (

Received: 2022-12-19
Accepted: 2023-06-02
Published Online: 2023-06-27
Published in Print: 2023-09-26

© 2023 IUPAC & De Gruyter

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