Electrochemically enhanced adsorption of phenol on activated carbon fibers in basic aqueous solution

被引：60

作者：

Han, Yanhe ^{[1
]}

Quan, Xie ^{[1
]}

Chen, Shuo ^{[1
]}

Zhao, Huimin ^{[1
]}

Cui, Chunyue ^{[1
]}

Zhao, Yazhi ^{[1
]}

机构：

[1] Dalian Univ Technol, Minist Educ, Sch Environm & Biol Sci & Technol, Key Lab Ind Ecol & Environm Engn, Dalian 116024, Peoples R China

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2006年 / 299卷 / 02期

关键词：

carbon fibers; phenol; electrosorption kinetics; electrosorption isotherms; thermodynamics;

D O I：

10.1016/j.jcis.2006.03.007

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electrosorption isotherms and thermodynamics of phenol on activated carbon fibers (ACFs) in basic solution, as well as the factors (bias potential, initial concentration, and electrolyte) affecting adsorption/electrosorption kinetics, were investigated. The kinetics, which followed the Lagergren adsorption rate law, exhibited a variety of responses depending on bias potential, initial concentration, and electrolyte. The electrosorption isotherms were in agreement with the classical models of Langmuir and Freundlich, but the former gave more satisfactory correlation coefficients. With electrosorption at a bias potential of 700 mV from the basic solution, a nearly 10-fold enhancement of maximum adsorption capacity was achievable. The electrosorption free energy (Delta G(ads)), enthalpy (Delta H-ads), and entropy (Delta S-ads) of phenol on the ACFs were calculated from adsorption isotherms at different temperatures. The results indicated that electrosorption of phenol in basic solution was spontaneous and exothermic. Furthermore, it was assessed that electrosorption occurred by dipole-dipole interaction with Delta H-ads of -20.14 kJ mol(-1) besides suppositional electrostatic interaction. (c) 2006 Elsevier Inc. All rights reserved.

引用

页码：766 / 771

页数：6

共 40 条

[1] Investigation of removal of Cr(VI), Mo(VI), W(VI), V(IV), and V(V) oxy-ions from industrial waste-waters by adsorption and electrosorption at high-area carbon cloth [J].