活性炭表面酸性基团对百草枯吸附的影响

doi:10.14088/j.cnki.issn0439-8114.2022.21.012

湖北农业科学 ›› 2022, Vol. 61 ›› Issue (21): 67-72.doi: 10.14088/j.cnki.issn0439-8114.2022.21.012

活性炭表面酸性基团对百草枯吸附的影响

范凯轩^a, 蒋帅^a, 李孟值^a, 李田田^a, 郝盼盼^b, 严湘^b, 杨纯金^b

巴中职业技术学院医学院,a.基础医学教研室; b.临床医学教研室,四川巴中 636601

收稿日期:2021-12-13 出版日期:2022-11-10 发布日期:2022-12-10
通讯作者: 杨纯金,主要从事外科学的研究,（电子信箱）3373713062@qq.com。
作者简介:范凯轩（1987-）,男,陕西兴平人,硕士,主要从事药学研究,（电话）029-38415154（电子信箱）378259066@qq.com。

Effect of surface acid groups of activated carbon on paraquat adsorption

FAN Kai-xuan^a, JIANG Shuai^a, LI Meng-zhi^a, Li Tian-tian^a, HAO Pan-pan^b, YAN Xiang^b, YANG Chun-jin^b

a. Department of Basic Medicine; b. Clinical Medicine Department,Bazhong Vocational Technical College, Bazhong 636601,Sichuan,China

Received:2021-12-13 Online:2022-11-10 Published:2022-12-10

摘要/Abstract

摘要： 用硝酸对煤质活性炭进行改性,考察了改性前后活性炭表面基团、织构变化及对百草枯的吸附影响,以GAC-6为研究对象进行动力学和热力学试验。采用Boehm滴定法和液态氮吸附法对活性炭进行了表征以及热力学和动力学模型的拟合。结果表明,硝酸改性活性炭对表面官能团有较大影响,随着氧化时间的延长,GAC系列活性炭的吸附主要以酸性官能团的影响为主,介孔亦有影响。改性可以提高对百草枯的吸附,吸附过程符合准二级动力学模型。与Langmuir等温模型相比,Freundlich吸附等温模型更能描述百草枯在活性炭上的吸附过程,用Dubbininin-Redushkevuch模型进行拟合,证明该吸附过程是一个物理过程,用Van't Hoff模型拟合,表明煤质活性炭对百草枯的吸附是一个吸热过程。

关键词: 活性炭, 改性, 百草枯, 吸附

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

中图分类号:

范凯轩, 蒋帅, 李孟值, 李田田, 郝盼盼, 严湘, 杨纯金. 活性炭表面酸性基团对百草枯吸附的影响[J]. 湖北农业科学, 2022, 61(21): 67-72.

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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活性炭表面酸性基团对百草枯吸附的影响

Effect of surface acid groups of activated carbon on paraquat adsorption

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