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

Author(s)

Leal, Maria Vitoria Guimaraes ; Gomes, Andressa Silva ; Tolosa, Gabrieli Roefero ; Dognani, Guilherme ; Job, Aldo Eloizo

• Document type: Journal article
• Source: Pure and Applied Chemistry; v. 95, n. 9, p. 10-pg., 2023-06-27.

Abstract

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. (AU)

• FAPESP's process: 14/50869-6 - INCT 2014: on Organic Electronics
• Grantee: Roberto Mendonça Faria
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 20/06577-1 - DEVELOPMENT OF HYBRID SYSTEMS OF CELLULOSE MICROFIBERS AND GOLD NANOPARTICLES FOR REMOVAL AND DETECTION (VIA SERS) OF EMERGING CONTAMINANTS IN AQUEOUS MEDIA
• Grantee: Guilherme Dognani
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 21/09773-9 - Production of cationic cellulose microfibers (CMF) and its application on removal of congo red dye from wastewater
• Grantee: Maria Vitória Guimarães Leal
• Support Opportunities: Scholarships in Brazil - Scientific Initiation