YANGSheng,MENGXiao-rong,CHENJia-zhi,et al.Preparation of Superhydrophilic PVDF@C-TA@CaCO3 Membrane and Its Oil?water Separation Performance[J].China Water & Wastewater,2022,38(15):14-20.
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Preparation of Superhydrophilic PVDF@C-TA@CaCO3 Membrane and Its Oil?water Separation Performance

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第15期 Page: 14-20 Column: Date of publication: 2022-08-01
Author(s):
YANG　Sheng1;  MENG　Xiao-rong1; 2;  CHEN　Jia-zhi1;  ZHU　Jun-feng1;  WANG　Xu-dong2; 3
（1. School of Chemistry and Chemical Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China； 2. Shaanxi Membrane Separation Technology Research Institute， Xi’an 710055， China； 3. School of Environmental and Municipal Engineering， Xi’an University of Architecture and Technology， Xi’an 710055， China）
Keywords:
polyvinylidene fluoride (PVDF) microfiltration membrane;  superhydrophilicity;  biomimetic mineralization;  calcium carbonate (CaCO3);  emulsified oil-water separation
Abstract:
Biomimetic mineralization method was employed to deposit CaCO3 particles on the surface of carboxylated tannic acid modified polyvinylidene fluoride (PVDF) microfiltration membrane to prepare superhydrophilic PVDF@C-TA@CaCO3 membrane. The effects of concentration of mineralized solution (CaCl2?and Na2CO3 solutions) and alternate impregnation times on PVDF@C-TA@CaCO3 membrane were investigated by using water contact angle and pure water flux as evaluation indexes. With the increase of the concentration of mineralized solution and the number of alternate impregnation, the water contact angle of PVDF@C-TA@CaCO3 membrane decreased gradually, and the pure water flux increased first and then decreased. When the concentration of mineralized solution was 0.15 mol/L and alternate impregnation for 10 times, the pure water flux of PVDF@C-TA@CaCO3 membrane reached the maximum of 5 750 L/(m2·h), and the water contact angle decreased to 10°. The retention rates of PVDF@C-TA@CaCO3 membrane to vegetable oil, cyclohexane and petroleum ether emulsion were 90.5%, 93.3% and 91.5%, respectively, and the flux recovery rates were 88.5%, 94.4% and 95.5%, respectively, showing good separation performance of oil-water mixture.
Last Update: 2022-08-01