Effect of surface acid groups of activated carbon on paraquat adsorption

doi:10.14088/j.cnki.issn0439-8114.2022.21.012

Abstract

Abstract: Coal-based activated carbon was modified by nitric acid. The changes of surface groups and texture of activated carbon before and after modification and its adsorption effect on paraquat were investigated. The kinetic and thermodynamic tests were carried out with GAC-6 as the research object. The activated carbon was characterized by Boehm titration and liquid nitrogen adsorption, and the thermodynamic and kinetic models were fitted. The results show that nitric acid modified activated carbon has a great influence on surface functional groups. With the extension of oxidation time, the adsorption of GAC series activated carbon is mainly affected by acidic functional groups, and mesopores also have an effect. Modification can improve the adsorption of paraquat, and the adsorption process conforms to the quasi-second-order kinetic model. Compared with the Langmuir isotherm model, the Freundlich adsorption isotherm model can better describe the adsorption process of paraquat by activated carbon. The Dubbininin-Redushkevuch model is fitted to prove that the adsorption process is a physical process. The Van't Hoff model fitting, indicated that the adsorption of paraquat by coal-based activated carbon is an endothermic process.

Key words: activated carbon, modification, paraquat, adsorption

CLC Number:

FAN Kai-xuan, JIANG Shuai, LI Meng-zhi, Li Tian-tian, HAO Pan-pan, YAN Xiang, YANG Chun-jin. Effect of surface acid groups of activated carbon on paraquat adsorption[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(21): 67-72.

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