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Preparation of cross-linked magnetic chitosan with quaternary ammonium and its application for Cr(VI) and P(V) removal
作者姓名:Wei Yao  Pinhua Rao  Irene M.C. Lo  Wenqi Zhang  Wenrui Zheng
作者单位:School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China;School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
基金项目:This work was supported by Innovation Projects from Shanghai Municipal Education Committee, China (No. 12YZ153) and the State Key Laboratory of Pollution Control and Resource Reuse Foundation (No. PCRRF12019).
摘    要:Pollutants that exist in anionic species are issues of concern in water treatment. Compared to cationic pollutants, the removal of anionic pollutants by adsorption is more difficult because most adsorbents carry predominantly negative charges in neutral and alkaline environments. In this study, a cross-linked chitosan derivative with quaternary ammonium and magnetic properties(QM-chitosan) was prepared and employed to remove chromium(VI) and phosphorus(V)(Cr(VI) and P(V)) from aqueous environments. The QM-chitosan was characterized by Fourier transform infrared spectrometry(FT-IR),thermogravimetric analysis(TGA), energy dispersive X-ray(SEM-EDX) and zeta potential.Batch experiments show that QM-chitosan can effectively remove Cr(VI) and P(V), and the main mechanism was believed to be electrostatic interaction. A pseudosecond-order model was fitted to describe the kinetic processes of Cr(VI) and P(V) removal. The adsorption isotherms of both Cr(VI) and P(V) on the QM-chitosan were well fitted by the Langmuir isotherm equation. The saturated adsorption capacity of P(V)(2.783 mmol/g) was found to be higher than that of Cr(VI)(2.323 mmol/g), resulting from the size of the H2PO-4ions being smaller than that of the HCr O-4ions. However, the theoretical calculation and experimental results showed that QM-chitosan had a stronger affinity for Cr(VI) than P(V). The adsorption–desorption of the QM-chitosan was evaluated, and high regeneration rates were demonstrated.

关 键 词:Cr(VI)  磁性壳聚糖  季铵  交联  制备  傅立叶变换红外光谱仪  铬(VI)  Langmuir
收稿时间:1/8/2014 12:00:00 AM
修稿时间:4/9/2014 12:00:00 AM

Preparation of cross-linked magnetic chitosan with quaternary ammonium and its application for Cr(VI) and P(V) removal
Wei Yao,Pinhua Rao,Irene M.C. Lo,Wenqi Zhang,Wenrui Zheng.Preparation of cross-linked magnetic chitosan with quaternary ammonium and its application for Cr(VI) and P(V) removal[J].Journal of Environmental Sciences,2014,26(12):2379-2386.
Authors:Wei Yao  Pinhua Rao  Irene MC Lo  Wenqi Zhang and Wenrui Zheng
Institution:School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China;School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
Abstract:Pollutants that exist in anionic species are issues of concern in water treatment. Compared to cationic pollutants, the removal of anionic pollutants by adsorption is more difficult because most adsorbents carry predominantly negative charges in neutral and alkaline environments. In this study, a cross-linked chitosan derivative with quaternary ammonium and magnetic properties (QM-chitosan) was prepared and employed to remove chromium(VI) and phosphorus(V) (Cr(VI) and P(V)) from aqueous environments. The QM-chitosan was characterized by Fourier transform infrared spectrometry (FT-IR), thermogravimetric analysis (TGA), energy dispersive X-ray (SEM-EDX) and zeta potential. Batch experiments show that QM-chitosan can effectively remove Cr(VI) and P(V), and the main mechanism was believed to be electrostatic interaction. A pseudosecond-order model was fitted to describe the kinetic processes of Cr(VI) and P(V) removal. The adsorption isotherms of both Cr(VI) and P(V) on the QM-chitosan were well fitted by the Langmuir isotherm equation. The saturated adsorption capacity of P(V) (2.783 mmol/g) was found to be higher than that of Cr(VI) (2.323 mmol/g), resulting from the size of the H2PO4- ions being smaller than that of the HCrO4- ions. However, the theoretical calculation and experimental results showed that QM-chitosan had a stronger affinity for Cr(VI) than P(V). The adsorption-desorption of the QM-chitosan was evaluated, and high regeneration rates were demonstrated.
Keywords:Magnetic chitosan  Quaternary ammonium  Cr(VI)  P(V)  Adsorption
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