氧化石墨烯对水溶液中中性红的吸附行为

白海鑫1，刘小花1，王瑾2，金秋1

(1.河南农业大学 理学院，河南 郑州450002；2.河南教育学院 化学与环境学院，河南 郑州450002)

摘要：研究了氧化石墨烯(GO)对水溶液中染料中性红的吸附性能.考察了GO浓度、吸附时间等因素对吸附效果的影响，探究了动力学及热力学吸附规律.结果表明，GO对中性红具有显著、快速的去除能力，最大饱和吸附量可达到约900 mg/g，该吸附过程可用准二级吸附速率方程进行描述.不同温度下的热力学参数研究表明GO对中性红的吸附过程符合Langmuir等温吸附方程式，是一个自发、放热、熵增的过程.

关键词：氧化石墨烯；中性红；吸附动力学；吸附热力学

DOI：10.3969/j.issn.1000-1565.2015.05.006

中图分类号：O647.31文献标志码：A

收稿日期:2015-01-29

基金项目：河南省教育厅科学技术研究重点项目(13A150481)；河南省高等学校青年骨干教师资助计划项目(2012GGJS-044).

Adsorption of neutral red from

aqueous solution using graphene oxide

BAI Haixin1, LIU Xiaohua1, WANG Jin2, JIN Qiu1

(1.College of Sciences, Henan Agricultural University,Zhengzhou 450002,China;

2. Department of Chemistry and Environment, Henan Institute of Education, Zhengzhou 450002,China)

Abstract:Graphene oxide (GO) was employed to be as adsorbent to remove neutral red in aqueous solution in this research. The affecting factors on the adsorption of neutral red had been investigated, including concentration of GO and adsorption time. The laws of adsorption kinetics and thermodynamics were also investigated. The results indicate that the graphene oxide has significant ability to remove neutral red quickly. The maximum adsorption capacity was 900 mg/g. The kinetic studies showed that the adsorption data could be represented by a pseudo second-order kinetic model. The adsorption isotherms measured at different temperatures show that Langmuir models could suitably describe the adsorption process with spontaneous, exothermic, entropy increase.

Key words：graphene oxide; neutral red; adsorption kinetics; adsorption thermodynamics

第一作者：白海鑫(1973-)，男，河南中牟人，河南农业大学副教授，博士，主要从事材料化学研究.

E-mail：haixin_bai@aliyun.com

随着中国染料工业迅速发展，染料应用领域大大拓宽，不仅用于装点服饰、美化生活和环境，也已经成为化学工业的一个重要分支.染料大多是以化工产品合成的芳香类化合物，年产量很大，其中10%～15%被排放到废水中；染料化学性质稳定，难以降解，具有潜在的毒性及致癌作用，对人类及生态环境造成了严重的威胁.因此，工业染料废水的处理及环境水中染料污染的去除受到人们的广泛关注.多种方法[1-2]如吸附法、膜分离法、磁分离法、化学氧化法、生……