Removal of methyl orange from aqueous solutions by magnetic maghemite/chitosan nanocomposite films: Adsorption kinetics and equilibrium

被引：146
作者：
Jiang, Ru [1 ]
Fu, Yong-Qian [1 ]
Zhu, Hua-Yue [1 ,2 ]
Yao, Jun [1 ]
Xiao, Ling [2 ]
机构：
[1] Taizhou Univ, Coll Life Sci, Linhai 317000, Peoples R China
[2] Wuhan Univ, Coll Resource & Environm Sci, Key Lab Biomass Resource Chem & Environm Biotechn, Wuhan 430072, Peoples R China
来源：
JOURNAL OF APPLIED POLYMER SCIENCE | 2012年 / 125卷
基金：
中国国家自然科学基金;
关键词：
chitosan; adsorption; magnetic separation; methyl orange; maghemite; WALLED CARBON NANOTUBES; CONGO-RED; ENHANCED ADSORPTION; REACTIVE DYE; BASIC-DYES; CHITOSAN; GAMMA-FE2O3; WATER; SORPTION; THERMODYNAMICS;
D O I：
10.1002/app.37003
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Magnetic maghemite (?-Fe2O3)/chitosan nanocomposite films were prepared by solution casting method and characterized by Fourier transform infrared spectra, thermogravimetric analysis, differential scanning calorimetry and X-ray diffraction. Batch adsorption experiments were carried out utilizing the composite films to adsorb a typical azo dye, i.e., methyl orange (MO) from aqueous solutions. The effects of adsorbent dosage, solution pH, coexisting anions, and temperature were studied. Adsorption kinetic was verified by pseudo-first-order and pseudo-second-order kinetic models. Results indicated that the rate of dye adsorption followed pseudo-second-order kinetic model for the initial dye concentration range studied. MO adsorption onto magnetic ?-Fe2O3/chitosan composite films was better described by Langmuir isotherm. Thermodynamic studies showed that MO adsorption was exothermic and spontaneous in nature. Because magnetic maghemite/chitosan nanocomposite films could be recovered conveniently and possessed of excellent adsorptive property, it can be developed as an economical and alternative adsorbent to decolorize or treat dye wastewater. (C) 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
引用
收藏
页码：E540 / E549
页数：10
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