Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 23    No. 2    February 2013

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Modification of ACFs by chemical vapor deposition and its application for removal of methyl orange from aqueous solution
Li-ping WANG1,2, Zhu-cheng HUANG2, Ming-yu ZHANG3

1. Department of Bioengineering and Environmental Science, Changsha University, Changsha 410003, China;
2. School of Minerals Processing and Bioengineering, Central South University, Changsha 410

Abstract:Viscose activated carbon fibers (ACFs) were modified with chemical vapor deposition (CVD). The samples were characterized using specific surface area, scanning electron microscopy (SEM), pore size distribution and Fourier transform infrared spectroscopy (FTIR). Batch adsorption experiments were carried out to investigate the adsorption behavior of modified ACFs for methyl orange(MO) from its aqueous solutions. The results show that the adsorption isotherms of MO onto modified ACFs well follows the Langmuir isotherm equation. The adsorption kinetics of MO can be well described by the pseudo second-order kinetic model. The adsorption process involves the intra-particle diffusion, but is not the only rate-controlling step. Thermodynamic parameters including ΔG, ΔH and ΔS were calculated, suggesting that the adsorption of MO onto modified ACFs is a spontaneous, exothermic and physisorption process. FTIR result indicates that the major adsorption mechanism of modified ACFs for MO is hydrogen bond.

 

Key words: viscose activated carbon fiber; chemical vapor deposition; modification; methyl orange; adsorption isotherm; kinetics; thermodynamics

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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