亲水改性纳滤膜去除小分子可溶性有机物的研究
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摘要
以聚醚砜溶胶为基底,掺杂未煅烧的SBA-15介孔分子筛前驱体,采用相转化法并经过120℃煅烧后制备成膜.利用N2吸附-脱附和静态接触角测试对改性膜材料的表面性能进行了表征.以富里酸、蛋白质作为小分子量溶解性有机物的典型代表物,考察不同掺杂量改性纳滤膜对其去除效果.实验结果表明,改性膜平均孔径大小有一个数量级的降低,达到纳滤级别,亲水性能增强.改性纳滤膜可以实现对富里酸(FA)的高效去除,膜吸附引起的有机溶质(FA)损失率也明显降低,从42.78%减少到3%以内,并优选出最佳掺杂量为质量分数0.2%的改性膜.优选膜对不同性质的氨基酸去除效果差别很大,最低为15.00%,最高可达79.67%.
The modified membranes have been fabricated on the polyethersulfone sol as substrate and the uncalcined SBA-15 mesoporous molecular sieve precursors as addition via phase inversion and calcination at120℃.The properties of the modified membranes were characterized by N2 adsorption-desorption and static contact angle.The effects of varying content of addition in modified nanofiltration membranes were investigated by using fulvic acid and protein as typical representative of small molecular weight dissolved organic matter.The results showed that the average pore size of modified membranes was reduced by an order of magnitude,reaching the nanofiltration level.Meanwhile,the hydrophilicity was enhanced.The modified nanofiltration membranes could remove fulvic acid effectively,with solute loss rate reducing,from 42.78%to less than 3%.0.2% modified membrane exhibited the best performance according to the effect of stain resistance and removal rate.Further more,the removal efficiency of amino acids in different sizes by the best modified membrane varied greatly,with a minimum of 15.00% and the maximum of79.67%.
The modified membranes have been fabricated on the polyethersulfone sol as substrate and the uncalcined SBA-15 mesoporous molecular sieve precursors as addition via phase inversion and calcination at120℃.The properties of the modified membranes were characterized by N2 adsorption-desorption and static contact angle.The effects of varying content of addition in modified nanofiltration membranes were investigated by using fulvic acid and protein as typical representative of small molecular weight dissolved organic matter.The results showed that the average pore size of modified membranes was reduced by an order of magnitude,reaching the nanofiltration level.Meanwhile,the hydrophilicity was enhanced.The modified nanofiltration membranes could remove fulvic acid effectively,with solute loss rate reducing,from 42.78%to less than 3%.0.2% modified membrane exhibited the best performance according to the effect of stain resistance and removal rate.Further more,the removal efficiency of amino acids in different sizes by the best modified membrane varied greatly,with a minimum of 15.00% and the maximum of79.67%.
引文
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[2]李开伟,李伟英,陆俊宇,等.混凝-粉末活性炭吸附-超滤工艺去除砂滤池反洗水溶解性有机物[J].膜科学与技术.2011,31(4):60-64.
[3]苑杨.当前城市饮用水处理技术问题的分析[J].中小企业管理与科技旬刊,2008,(3):97.
[4]Ma Y.Study on the removal of dissolved organic matters in the raw water by a new magnetic anion-exchange resin[J].Desalination Water Treat,2016,57(2):572-581.
[5]凌小佳,祝建中,丁莹,等.低压耐污共混纳滤膜的研发及其对典型溶解性有机物的去除研究[J].水处理技术.2017,43(5):64-67.