摘要
为改善聚醚砜(PES)超滤膜的抗污染性能和提高对腐殖酸(HA)的截留率,以介孔二氧化硅(MS)为添加剂,采用相转化法制备了亲水性PES/MS复合超滤膜,并对膜表面进行荷电改性.研究了MS对膜的断面结构、表面化学性质和过滤性能的影响,考察了荷电改性PES/MS超滤膜对水中HA的分离性能以及溶液p H值、离子强度和钙离子浓度等因素对荷电膜超滤过程的影响.SEM表征结果显示,MS颗粒在PES/MS复合膜的表面分散均匀,膜孔的连通性改善.亲水荷电改性后,膜表面接触角由68°降至57°,zeta电位由-6.31m V降至-11.45m V,膜对HA的去除率由72%提高到95%,通量衰减率由29.8%减小到4.9%.结果表明,对PES超滤膜进行亲水荷电改性可有效提高对HA的截留率,同时减轻膜污染;另外,溶液的p H值、离子强度和钙离子浓度对荷电超滤膜的过滤性能有较大影响,调节合适的溶液环境可在提高截留率的同时,减轻膜污染.
To improve the antifouling performance and enhance the humic acid（HA） removal rate of polyethersulfone（PES） ultrafiltration membrane, the mesoporous silica（MS） was incorporated in PES membrane by phase inversion method and the surface of PES/MS membrane was negatively modified. The effects of MS on the PES membrane structure, surface chemical property and filtration performance were studied. The HA separation property of negatively charged PES/MS membrane and the effects of p H value, ion strength and Ca^2＋ concentration on the filtration performance were also investigated. SEM images showed that MS particles dispersed evenly on the PES/MS surface and the membrane pore connectivity was improved. After the hydrophilic charged modification, the contact angle of PES membrane decreased from 68° to 57°, the zeta potential decreased from-6.31 m V to-11.45 m V; the HA removal rate increased from 72% to 95% while the flux decline rate decreased from 29.8% to 4.9%. Results indicated that hydrophilic charged modification on the PES membrane could be an effective way for better removal of HA and reduction of the membrane fouling; In addition, solution environment, including p H, ionic strength and calcium ion concentration, affecting HA filtration process could be adjusted to achieve higher removal rate and less fouling.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2014年第11期2831-2837,共7页
China Environmental Science
基金
浙江省自然科学基金青年科学基金项目(LQ14B060001)
浙江省教育厅科研项目资助(Y201328359)
浙江省科技厅公益性项目(2013C33019)
作者简介
黄健（1981-），男，湖北随州人，讲师，博士，主要研究方向为超滤膜抗污染改性及膜分离技术．发表论文6篇．
责任作者，讲师，zhangsihai2352@163．com
