Removal of low concentration methylene blue by anionic block magnetic coagulant
ZHENG Huai-li1,2, YU Zhi-shuang1, ZHAO Rui1,2, LI Hong1, SUN Qiang1,2, HU Ya-dan1, JIANG Jun-yi1
1. Key Laboratory of the Three Gorges Reservoir Region's Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; 2. Chongqing Engineering Research Center of Water Treatment Coagulant, Chongqing 400045, China
Abstract：Template anionic polyacrylamide (TAPAM) with anionic block structure was synthesized by template method, then modified with polydopamine (PDA) and grafted with Fe3O4 nanoparticles by chelation, named TAPAM-PDA-Fe3O4. Compared with PDA and APAM-Fe3O4 in the removal of methylene blue, the results illustrated that TAPAM-PDA-Fe3O4 showed the highest removal rate and the dominant effect of π-π stacking under neutral/alkaline conditions(7.03O4 could effectively remove methylene blue at low concentrations.When the initial concentration of methylene blue was 4mg/L and the pH value was 9, the maximum removal efficiency reached 97.5%.
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