Mechanism of removal of Cr(VI) ions in water by activated carbon prepared from rice husk

被引：1

作者：

Yao, Shuheng ^{[1
]}

Jiang, Xiaoxiang ^{[2
]}

Shen, Dekui ^{[1
]}

Xiao, Rui ^{[1
]}

Jin, Baosheng ^{[1
]}

机构：

[1] Key Laboratory of Energy Conversion and Process Control of Ministry of Education, Southeast University, Nanjing

[2] School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing

来源：

Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2015年 / 45卷 / 03期

关键词：

Activated carbon; Adsorption; Chromium(VI); Rice husk; Zinc chloride;

D O I：

10.3969/j.issn.1001-0505.2015.03.018

中图分类号：

学科分类号：

摘要：

Taking rice husk as raw material and zinc chloride as activation, the activated carbon was prepared by microwave and electric dual-mode heating. The mechanism of removal of chromium(VI) ions in water were studied. The optimum conditions, including the activation temperature of 600 ℃, the activation time of 50 min, the impregnation ratio (m(ZnCl2)∶m(rice husk)) of 1.5∶1, and the heating rate of 15 ℃/min were obtained through single factor experiments. The porous characteristics and surface chemical properties of activated carbon under optimum conditions were characterized by FTIR, specific surface area and porosity analyzer and pHIEP (pH of isoelectric point). The influence laws on Cr(VI) adsorption capacity by the contact time, pH, adsorbent dose and initial concentration of Cr(VI) ions were investigated. The results show that the specific surface area achieves 1 719.32 m2/g, and the total pore volume was 1.05 cm3/g. For the activated carbon from optimum conditions the maximum adsorption capacity is achieved when pH is between 2.0 and 3.0, and equilibrium adsorption stage is attained within 90 min. ©, 2015, Southeast University. All right reserved.

引用

页码：515 / 520

页数：5

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