研究论文

氧化石墨对对硝基苯酚的吸附行为

  • 查飞 ,
  • 曾慧崇 ,
  • 常玥
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  • 西北师范大学化学化工学院, 兰州730070
查飞,教授,研究方向为能源与环境化工、现代分离分析技术,电子信箱:zhafei@nwnu.edu.cn;曾慧崇,硕士研究生,研究方向为现代分离分析技术,电子信箱:zhcwsm@163.com

收稿日期: 2013-09-16

  修回日期: 2013-11-17

  网络出版日期: 2014-03-07

基金资助

国家自然科学基金项目(21161017)

Adsorption Properties of Graphite Oxide for p-Nitrophenol

  • ZHA Fei ,
  • ZENG Huichong ,
  • CHANG Yue
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  • College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China

Received date: 2013-09-16

  Revised date: 2013-11-17

  Online published: 2014-03-07

摘要

以石墨粉为原料,经Hummers 法制备氧化石墨,采用红外光谱、X 射线衍射和扫描电镜对产物结构进行表征。结果表明,氧化石墨含有C—OH、—COOH 和C—O—C 等官能团,使石墨的层间作用力减弱,层间距增大。研究了氧化石墨对对硝基苯酚的吸附行为,当吸附温度为298 K,pH 为7.0 时,氧化石墨对对硝基苯酚的吸附量为80.69 mg/g,是石墨粉吸附量的6.1 倍。吸附热力学研究表明,氧化石墨对对硝基苯酚的吸附可以用Langmuir 方程拟合,吸附是自发的放热过程,低温有利于吸附的进行。动力学拟合显示吸附符合二级动力学模型。

本文引用格式

查飞 , 曾慧崇 , 常玥 . 氧化石墨对对硝基苯酚的吸附行为[J]. 科技导报, 2014 , 32(6) : 34 -39 . DOI: 10.3981/j.issn.1000-7857.2014.06.005

Abstract

The graphite oxide was prepared from the powdered graphite via the Hummers method. It was characterized by the methods of the FT-IR, the XRD and the SEM. It is shown that the graphite oxide contains various oxygen-containing functional groups such as C—OH, —COOH and C—O—C, which increase the layer spaces. Adsorption experiments indicate that the graphite oxide has an outstanding adsorption ability for the p-nitrophenol. With the adsorption temperature at 298 K and the pH value at 7.0, the adsorptive capability of the graphite oxide is up to 80.69 mg/g, 6.1 times of that of the graphite powder. From the adsorption isotherms and thermodynamic functions, it is shown that the adsorption can be described by the Langmuir isothermal equation and is a spontaneous and exothermic process. The kinetic study shows that the adsorption can be fitted by second-order dynamic equations.

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