超亲水PVDF@C-TA@CaCO_(3)膜制备及油水分离性能

Preparation of Superhydrophilic PVDF@C-TA@CaCO_(3) Membrane and Its Oil-water Separation Performance

采用仿生矿化法在羧基化单宁酸修饰的聚偏氟乙烯(PVDF)微滤膜表面沉积CaCO_(3)颗粒,制备了超亲水性PVDF@C-TA@CaCO_(3)膜。以水接触角和纯水通量为指标,考察矿化液(CaCl_(2)和Na_(2)CO_(3)溶液)浓度和交替浸渍次数对PVDF@C-TA@CaCO_(3)膜的影响。结果表明,随着矿化液浓度和交替浸渍次数的增加,PVDF@C-TA@CaCO_(3)膜的水接触角逐渐下降,纯水通量先上升后下降。当矿化液浓度为0.15 mol/L、交替浸渍次数为10次时,PVDF@C-TA@CaCO_(3)膜的纯水通量达到最高即5750 L/(m^(2)·h),水接触角降为10°。PVDF@C-TA@CaCO_(3)膜对植物油、环己烷和石油醚乳化液的截留率分别为90.5%、93.3%和91.5%,通量恢复率分别为88.5%、94.4%和95.5%,显示出良好的乳化油水分离性能。

Biomimetic mineralization method was employed to deposit CaCO_(3)particles on the surface of carboxylated tannic acid modified polyvinylidene fluoride(PVDF)microfiltration membrane to prepare superhydrophilic PVDF@C-TA@CaCO_(3)membrane.The effects of concentration of mineralized solution(CaCl_(2)and Na_(2)CO_(3)solutions)and alternate impregnation times on PVDF@C-TA@CaCO_(3)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@CaCO_(3)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@CaCO_(3)membrane reached the maximum of 5750 L/(m^(2)·h),and the water contact angle decreased to 10°.The retention rates of PVDF@C-TA@CaCO_(3)membrane to vegetable oil,cyclohexane and petroleum ether emulsion were90.5%,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.