二氧化钛光催化膜分离耦合技术在水处理中的应用

发布时间：2018-04-17 23:04

本文选题：TiO/PVDF膜 + 光催化　；参考：《无机盐工业》2017年07期

【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。
[Abstract]:Nanometer titanium dioxide was prepared by hydrothermal method and TiO_2/PVDF membrane was prepared by phase conversion method. The composite membrane was used in photocatalytic membrane reactor. The natural macromolecular wastewater was simulated with 1 g / L bovine serum protein (BSA) solution. The retention rate and membrane flux were taken as parameters.The photocatalytic properties and membrane separation properties of the films were studied by alternating operation of photo-interception and photocatalytic degradation.The results showed that the hydrophilicity of PVDF membrane could be increased by adding nano-TiO _ 2, and the TiO_2/PVDF membrane with titanium dioxide content of 3% had the best hydrophilicity, and the rejection rate of BSA reached 93%.The membrane flux decreased and the attenuation rate reached 850.After adding pure water for a period of time, the membrane flux gradually recovered and the recovery rate reached 86 because of the photocatalytic degradation of BSA macromolecules on the surface of the membrane by photocatalytic degradation of nano-TiO _ 2 for a period of time.The recovery rate tends to be stable.The results show that the TiO_2/PVDF membrane is used in the photocatalytic membrane reactor. The coupling of the photocatalytic technology and the membrane separation technology can significantly restore the membrane flux increase the service life of the membrane and avoid the loss of the catalyst.
【作者单位】：郑州轻工业学院材料与化学工程学院;中国轻工业污染治理与资源化重点实验室;环境污染治理与生态修复河南省协同创新中心;河南博之捷环保科技有限公司;
【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)
【分类号】：O643.3;TQ028.8;X703

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