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Adsorption of chromium (VI) from aqueous solutions by cellulose modified with β-CD and quaternary ammonium groups
Yanmei Zhou1, Qiang Jin, Tianwei Zhu
1Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering, Henan University, Jinming Street, Kaifeng, Henan 475004, PR China. zhouyanmei@henu.edu.cn
Abstract:
Cellulose powder was grafted with the vinyl monomer glycidyl methacrylate using ceric ammonium nitrate as initiator and was further derived with β-CD and quaternary ammonium groups to build Cell-g-GMA-β-CDN(+) adsorbent. Epoxy cellulose was made up of Cell-g-GMA and Cell-hydro-g-GMA, and was found to contain 3.71 mmol g(-1) epoxy groups. The adsorption process of the modified cellulose was described by the Langmuir model of adsorption well, and the maximum adsorption capacity of chromium (VI) reached 61.05 mg g(-1). The adsorption-desorption tests of β-CDN(+)-type cellulose derivatives exhibited that the reproducibility of the adsorbent was well and the adsorbent could be reused five times at least.
