Glyphosate removal from water by functional three-dimensional graphene aerogels
Chaofan Ding A , Xueying Wang A , Hao Liu A , Yue Li A , Yuanling Sun A , Yanna Lin A , Weiyan Sun A , Xiaodong Zhu A , Yuxue Dai A and Chuannan Luo
A B
+ Author Affiliations
- Author Affiliations
A Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China.
B Corresponding author. Email: chm_yfl518@163.com
Environmental Chemistry 15(6) 325-335 https://doi.org/10.1071/EN18087
Submitted: 4 May 2018 Accepted: 6 June 2018 Published: 8 August 2018
Environmental context. Glyphosate is a non-selective and widely used herbicide commonly found as a contaminant in water. This work reports the use of functional graphene aerogels prepared with carboxymethyl chitosan and graphene oxide for the efficient adsorption and removal of glyphosate present in water samples. The procedure has potential to successfully treat water bodies contaminated with glyphosate.
Abstract. Three-dimensional carboxymethyl chitosan (CM-CS)–graphene aerogels (CM-CS@GA) were prepared through an integration strategy of a carboxylation process and freeze drying technology for efficient glyphosate removal from water. The structure, surface properties, morphology and crystal phase of the prepared CM-CS@GA composites were characterised using SEM, TEM, XRD, FT-IR and BET. The adsorption behaviour of glyphosate in aqueous solution on CM-CS@GA was systematically investigated. The results show that with the advantages of high surface area, and abundant hydroxyl and carboxyl groups of CM-CS@GA, glyphosate can be easily and rapidly extracted from the water. The adsorption equilibrium of CM-CS@GA for glyphosate correspond to a Langmuir isotherm, the maximum adsorption capacity can reach to 578.0 mg g−1, and the novel adsorbent exhibited a better glyphosate removal efficiency in solutions with low pH. The exhausted CM-CS@GA composites could be regenerated by NaOH solution for repeated use without any significant capacity loss, where the adsorbed glyphosate was effectively desorbed into the solution. These results provide evidence to further validate that CM-CS@GA composites would be of considerable potential in the removal of glyphosate from contaminated waters.
Additional keywords: adsorption, chitosan.
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