Studies on the adsorption of cadmium ions by micro-size carbon fibers in aqueous solution

被引：0

作者：

Gao, Zhan-Ming ^{[1
]}

Li, Zhen-Tao ^{[1
]}

Han, Mei ^{[2
]}

Zhao, Zong-Bin ^{[1
]}

Qiu, Jie-Shan ^{[1
]}

机构：

[1] State Key Lab of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China

[2] Fundamental Chemistry Laboratory Center, Dalian University of Technology, Dalian 116024, China

来源：

Xinxing Tan Cailiao/New Carbon Materials | 2012年 / 27卷 / 03期

关键词：

Cadmium - Carbon fibers - Ions - Kinetics - Oxidation - pH - Precipitation (chemical) - Solutions;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Micro-size carbon fibers (MCFs) with a diameter of 0.4-0.6 μm and a length of tens of micrometers were prepared on a coal-based anode by dc arc discharge in a mixture of helium and acetylene. The adsorption of cadmium ions by the MCFs in solution was studied. The effect of the functional groups, time, pH value and initial concentration of solution on the adsorption of cadmium ions was investigated. Results showed that the acid oxidation resulted in an increase in the number of oxygen-containing groups. The adsorption capacity of the oxidized MCFs increased significantly. The pH value has a great influence on the adsorption of cadmium ions. A kinetic study showed that the adsorption followed the pseudo-second order kinetic adsorption model. Both Langmuir and Freundlich models described the adsorption isotherms well at pH-1 and pH=5.50, the adsorption capacities were 5.7 mg·g-1 or 0.058 mg·m-2. These suggested that the MCFs have potential applications in environmental protection.

引用

页码：219 / 225