Nano-TiO2回收过程中SO42-对不同混凝剂混凝过程的影响

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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 SO₄^2- 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 SO₄^2-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 Al_a could not react with SO₄^2-, 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 SO₄^2- 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.

Key words： coagulation nano-TiO₂ SO₄^2- aluminum speciation floc

Received: 19 April 2021

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X703.5

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	LIU Yu
	LI Hui-li
	XU Hui
	LI Ming-shuang
	XIANG Yu
	LYU Ping
	WANG Ya-bo

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LIU Yu,LI Hui-li,XU Hui等. Effect of SO₄^2- on coagulation performance using different coagulants in nano-TiO₂ recovery process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(12): 5627-5636.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I12/5627

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