摘要
通过水热法制备纳米二氧化钛,采用相转换法制备TiO_2/PVDF膜,将该复合膜用于光催化膜反应器中,以1 g/L牛血清蛋白(BSA)溶液模拟天然大分子废水,以截留率和膜通量为参数,采用无光截留-光催化降解交替运行方式研究其光催化性能与膜分离性能。结果表明,添加纳米二氧化钛能增大PVDF膜的亲水性,二氧化钛质量分数为3%的TiO_2/PVDF膜亲水性最好,对BSA的截留率达到93%;采用交替运行方式,无光时膜表面截留大量的BSA分子,膜通量减小,衰减率达到85%~90%,加光通纯水一段时间后,由于纳米二氧化钛光催化降解膜表面的BSA大分子,膜通量逐渐恢复,恢复率均达到86%;连续交替运行后,周期逐渐缩短,恢复率趋于稳定。说明TiO_2/PVDF膜用于光催化膜反应器中,将光催化技术与膜分离技术耦合,显著地恢复了膜通量,增加膜的使用寿命,同时避免了催化剂流失。
The nano TiO2 was prepared by hydro-thermal method.The TiO2 /PVDF membranes were prepared by phase trans-formation method.The TiO2 /PVDF membranes were applied in the photocatalytic membrane reactors.With the 1 g/L BSA solu-tion to simulate the natural macromolecule wastewater,the photocatalytic and separation properties of TiO2 /PVDF membranes were investigated by using the alternating operation mode with no-light interception and photocatalytic degradation,and with membrane retention rate and f lux as evaluating indexes.The results showed that adding TiO2 to PVDF membranes could im-prove its hydrophilicity,and TiO2 /PVDF membranes with mass fraction of TiO2 of 3% had the best hydrophilicity and mem-brane retention rate to BSA reached 93%.In condition of no-light,membrane surface intercepted a large amount of BSA molecules,membranefoul ingwasreduced,theattenuationratereached85%- 9 0% ,a n d inU V l ig h t ,p h o to c a ta ly s is c o u ld effectively recover membrane f lux with recovery of 86%.Continuous running,alternately cycle gradually shortened,recovery rate tended to be stable.The antifouling study of the TiO2 entrapped PVDF membranes had fouling resistance.The alternating operation with membrane separation and photocatalytic can effectively recover membrane flux and avoid the running off of catalyst at the same time.
出处
《无机盐工业》
CAS
北大核心
2017年第7期52-56,共5页
Inorganic Chemicals Industry
基金
环境污染治理与生态修复河南省协同创新中心开放基金(XTCX-005)
