羧基功能化微滤膜PSF-g-PMAA的制备及对三嗪类除草剂的截留去除性能

Carboxyl Functionalized Microfiltration Membrane PSF-g-PMAA:Preparation,Rejection and Removal Properties for Triazine Herbicides

使用过硫酸盐在胺基化的氯甲基化聚砜微滤膜表面形成—NH2/S2O82-氧化还原引发体系,将甲基丙烯酸(MAA)接枝聚合到聚砜微滤膜表面,得到羧基功能化PSF-g-PMAA微滤膜.采用等温吸附和渗透实验,考察了PSF-g-PMAA膜对三嗪类除草剂(扑草净、莠灭净、阿特拉津)的截留去除性能.结果表明,基于静电相互作用和氢键的协同吸附作用,PSF-g-PMAA膜对三嗪类除草剂显示出良好的去除效果,其中对莠灭津的最大吸附量达到0.18μmol/cm^(2)(41μg/cm^(2)).采用膜面积为1.77 cm^(2)的注射过滤器,PSF-g-PMAA膜对浓度为0.8 mg/L的三嗪类除草剂溶液的截留率接近100%(渗透液体积100 mL).

A redox surface-initiating system of—NH2/S2O28−was constituted at the interface of amine-based chloro⁃methylated polysulfone(CMPSF)microfiltration membrane by using persulfate.MAA was graft-polymerized on the surface of microfiltration membrane by using the surface-initiating graft-polymerization method,and the grafted microfiltration membrane of PSF-g-PMAA was obtained.The rejection and removing performance of PSF-g-PMAA membrane for the three triazine herbicides(ametryn,prometryn and atrazine)from water was examined by using isothermal adsorption experiments and the permeation experiments.The experimental results show that PSF-g-PMAA membrane has strong removal properties for the three triazine herbicides under the synergy adsorption of electrostatic interaction and hydrogen bond interaction,and the maximum adsorption capacity of PSF-g-PMAA membrane for ametryn can reach up to 0.18μmol/cm^(2)(41μg/cm^(2)).Using an injection filter with a membrane area of 1.77 cm^(2),the rejection rate of PSF-g-PMAA membrane for the solutions of the three triazine herbicides with a concentration of 0.8 mg/L can be closed to 100%under 100 mL of penetrating liquids.