Polymeric ferric sulfate hydrolysis based on external magnetic field regulation
LIN Neng1,2, SHI Xiao-xue1,2, YUAN Yuan3, ZHANG Jin-cheng3, GUO xing-fei1,2,4, JIA hui1,2,4, WANG Jie1,2,4
1. State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China; 2. School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China; 3. Beijing Zhongchuang Longyuan Environment Technolongy CO. LTD, Beijing 102600, China; 4. Tianjin Engineering Center for Safety Evaluation of Water Quality&Safeguards Technology, Tiangong University, Tianjin 300387, China
Abstract：Based on the UV-vis spectroscopy characteristics of PFS, the magnetization of polyferric sulfate was controlled by external magnetic field. The effects of different magnetization time and magnetic field strength on the distribution of iron in PFS were studied. The results showed that the iron salt gradually combines with the hydroxyl group during the hydrolysis process, and the transition from the oligomeric state to the relatively high polymer state. On the whole, increasing the magnetization time and magnetic field strength within a certain range could effectively promote the hydrolysis of flocculants, moreover, magnetic field strength can achieve a more obvious effect on the process of multiple parameters operation. In the present paper, the flocculent conformation and qualities of polymer ferric sulfate flocculants were studied by the ultraviolet-visible spectrum. Under the same magnetic field strength, the conversion rate from the oligomeric state to the relatively high polymer state is faster when magnetization time is 4-6min.Under the same magnetization time, the conversion rate of hydrolyzed products with magnetic field strength increased by 1.9% to 12.3%.By designing appropriate magnetic field to provide a more scientific and theoretical surpport for the regulation of PFS flocculation process.
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