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Effect of SO42- on coagulation performance using different coagulants in nano-TiO2 recovery process |
LIU Yu1,2, LI Hui-li1,3, XU Hui2, LI Ming-shuang2,4, XIANG Yu2,5, LYU Ping1,2, WANG Ya-bo1,2 |
1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2. State Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 3. Kashi University, Kashi 844099, China; 4. University of Chinese Academy of Sciences, Beijing 100049, China; 5. School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China |
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Abstract In order to reduce the practical cost of nano-TiO2, the TiO2 was isolated via solid-liquid process by applying different coagulants. By investigating the turbidity removal rate, effluent pH value, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), solid state nuclear magnetism (NMR), scanning electron microscopy (SEM), and energy spectrum analysis (EDS), the effects of SO42- on the coagulation efficiency during nano-TiO2 recycling process was studied. The results showed that the turbidity removal rate decreased by 0.80%, and the floc size decreased from 450μm to 215μm when the concentration of SO42-increased from 0.0mmol/L to 20.0mmol/L under AlCl3 (0.1mmol/L), while the strength factor of flocs did not change significantly. The low polymerization species Ala could not react with SO42-, and generated large amount of amorphous Al(OH)3 via adsorption bridging and flocculation sweeping effects during coagulation process. When Al13 was used as coagulant, the size of re-growth flocs decreased with the increasing of SO42- concentration. The occurrence of red shift for S-O peak indicated that the new S-containing polymers were produced. The movement of Al 2p peak toward higher binding energy revealed that no Al(OH)3 was generated in the flocs.
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Received: 19 April 2021
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