Novel magnetic chitosan/poly(vinyl alcohol) hydrogel beads: Preparation, characterization and application for adsorption of dye from aqueous solution

被引：234
作者：
Zhu, H. -Y. [1 ,2 ]
Fu, Y. -Q. [1 ]
Jiang, R. [1 ]
Yao, J. [1 ]
Xiao, L. [2 ]
Zeng, G. -M. [3 ]
机构：
[1] Taizhou Univ, Coll Life Sci, Linhai 317000, Zhejiang, Peoples R China
[2] Wuhan Univ, Key Lab Biomass Resource Chem & Environm Biotechn, Wuhan 430072, Hubei, Peoples R China
[3] Hunan Univ, Minist Educ, Key Lab Environm Biol & Pollut Control, Changsha 410082, Hunan, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2012年 / 105卷
关键词：
Chitosan; Poly(vinyl alcohol); Magnetic adsorbent; Adsorption; Congo Red; CONGO-RED; REMOVAL; KINETICS; CHITOSAN; NANOPARTICLES; EQUILIBRIUM; GAMMA-FE2O3; ADSORBENT; BEHAVIOR; GASES;
D O I：
10.1016/j.biortech.2011.11.057
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
Novel magnetic chitosan/poly(vinyl alcohol) hydrogel beads (m-CS/PVA HBs) were prepared by an instantaneous gelation method and characterized by X-ray diffraction (XRD), vibrating sample magnetometry (VSM) and thermogravimetric analysis (TGA). Results of characterization indicated that m-CS/PVA HBs have been prepared successfully without damaging the crystal structure of Fe3O4 and their saturation magnetization were about 21.96 emu g(-1). The adsorption capacity of Congo Red on the m-CS/PVA HBs was 470.1 mg g(-1). The adsorption was well described by pseudo-second-order kinetics and Langmuir equation. Positive value of enthalpy change (Delta H degrees) (13.32 kJ mol(-1)) showed that the adsorption was endothermic and physical in nature. The values of Gibbs free energy change (Delta G degrees) were found to be -3.321 kJ mol(-1) at 298 K for m-CS/PVA HBs, indicating the spontaneity of Congo Red adsorption. Therefore, the m-CS/PVA HBs could be employed as a low-cost alternative to other adsorbents in the removal of dyes from aqueous solution. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：24 / 30
页数：7
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