Synthesis of magnetic cationic chitosan flocculant by low-pressure UV light for the removal of Cr(Ⅵ)
ZHENG Huai-li1, ZHONG Zheng1, ZOU Hong2, BAI Ying3, ZHAO Rui1, DING Wei1, JIANG Jun-yi1
1. Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, China; 2. Chongqing Lanjie Guangshun Water Treatment Materials Co. Ltd, Chongqing 402465, China; 3. CenerTech Tianjin Chemical Research and Design Institute Co. Ltd, Tianjin 300131, China
Abstract：A new magnetic chitosan flocculant FSCAD was synthesized by using magnetic Fe3O4 coated with silica and silane coupling agent (KH-570) as magnetic core, chitosan, acrylamide and acryloyloxyethyl trimethylammonium chloride as graft monomers and low-pressure ultraviolet light as initiator, the Cr(Ⅵ) removal properties of the material were studied. The flocculants were characterized by fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray diffractometer and vibration sample magnetometer, showing the materials were successfully prepared and have good magnetic response. The effects of pH, dosage, reaction time and interference ions on flocculation properties were explored and fitted to the flocculation dynamics model. The flocculation kinetics accorded with the pseudo second order kinetic equation and the removal effect of FSCAD on low concentration Cr(Ⅵ) wastewater reached 90.48% at the added amount of 900mg/L, pH of 3 and the reaction time of 60min.
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