核桃壳水热炭对六价铬的吸附特性

doi:10.16085/j.issn.1000-6613.2016.03.044

化工进展 ›› 2016, Vol. 35 ›› Issue (03): 950-956.DOI: 10.16085/j.issn.1000-6613.2016.03.044

核桃壳水热炭对六价铬的吸附特性

张双杰, 邢宝林, 黄光许, 贾建波, 徐冰, 张效铭, 张传祥

河南理工大学材料学院, 河南焦作 454003

收稿日期:2015-09-21 修回日期:2015-11-10 出版日期:2016-03-05 发布日期:2016-03-05
通讯作者: 张传祥,教授,博士生导师,从事煤基炭材料及电化学应用等方面的教学及研究工作。E-mail:zcx223@hpu.edu.cn.
作者简介:张双杰(1990-),女,硕士研究生,研究方向为炭材料的制备及应用性能研究。E-mail:15239197856@163.com.
基金资助:
国家自然科学基金(U1361119,51404098,51174077)、河南省教育厅自然科学研究计划(2011B440006)及河南理工大学博士基金(B2010-82)项目。

A study on adsorption of Cr(Ⅵ) by hydrothermal carbon from walnut shell

ZHANG Shuangjie, XING Baolin, HUANG Guangxu, JIA Jianbo, XU Bing, ZHANG Xiaoming, ZHANG Chuanxiang

School of Material Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China

Received:2015-09-21 Revised:2015-11-10 Online:2016-03-05 Published:2016-03-05

摘要/Abstract

摘要： 以核桃壳为前体采用水热炭化法制备水热炭,利用低温液氮物理吸附仪和傅里叶变换红外光谱仪测定水热炭的孔结构和表面官能团;实验研究其对液相中Cr(Ⅵ)的吸附特性,考察吸附剂加入量、Cr(Ⅵ)初始浓度、pH值、吸附时间等因素对吸附效果的影响。结果表明,水热炭的孔径分布范围较宽,表面含氧官能团丰富,能够很好地吸附溶液中的六价铬;溶液pH值对Cr(Ⅵ)的脱除影响很大,pH值呈酸性时吸附效果较好,pH值为2时脱除率达98.85%.当反应温度35℃、Cr(Ⅵ)初始浓度50mg/L、水热炭投加量为16g/L、pH值为6、吸附时间为100min时,Cr(Ⅵ)离子的去除率可达98%以上。核桃壳水热炭对Cr(Ⅵ)具有良好的吸附能力,吸附过程符合准二级吸附动力学模型,可用Freundlich吸附等温模型来描述,吸附等温线的线性相关性显著。

关键词: 核桃壳, 水热炭, 六价铬, 吸附

Abstract: Walnut shell based hydrothermal carbon(HTC) was synthesized,characterized and used as an adsorbent to removal Cr(Ⅵ) from aqueous solution. The influence of pH values,adsorbent dosage,initial Cr(Ⅵ) concentration and contact time on its removal was investigated. The results showed that the HTC has a wide pore size distribution and contains a large amount of oxygen-containing functional groups,which are favorable for the adsorption. The adsorption process largely depends on the pH values and reaches a maximum(98.85%)at pH 2. The results showed an efficient removal at pH 6,within 100min,by using 16mg/L HTC and 50mg/L Cr(Ⅵ) at 35℃。 High R² value of 0.98889 was obtained with the pseudo-second-order model. The adsorption isotherms data of Cr(Ⅵ) on HTC obtained at 35℃,45℃ and 55℃ were analyzed by Langmuir and Freundlich isotherm models,which showed that it is better described by the Freundlich isotherm model.

Key words: walnut shell, hydrothermal carbon, Cr(Ⅵ), adsorption

中图分类号:

TQ424.3

张双杰, 邢宝林, 黄光许, 贾建波, 徐冰, 张效铭, 张传祥. 核桃壳水热炭对六价铬的吸附特性[J]. 化工进展, 2016, 35(03): 950-956.

ZHANG Shuangjie, XING Baolin, HUANG Guangxu, JIA Jianbo, XU Bing, ZHANG Xiaoming, ZHANG Chuanxiang. A study on adsorption of Cr(Ⅵ) by hydrothermal carbon from walnut shell[J]. Chemical Industry and Engineering Progree, 2016, 35(03): 950-956.

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核桃壳水热炭对六价铬的吸附特性

A study on adsorption of Cr(Ⅵ) by hydrothermal carbon from walnut shell

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