负载型光催化膜特征及氟伐他汀降解性能分析  

Characteristics of photocatalytic membrane loaded with ZnIn2S4 and its degradation performance of fluvastatin

作　　者：孙辰旭 王磊[1,2] 刘婷婷[1,2] 刘秀[1,2] 吕永涛 SUN Chenxu;WANG Lei;LIU Tingting;LIU Xiu;LüYongtao(School of Environmental&Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Laboratory of Membrane Separation of Shaanxi Province(Xi’an University of Architecture and Technology),Xi’an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]西安建筑科技大学陕西省膜分离重点实验室,西安710055

出　　处：《哈尔滨工业大学学报》2019年第9期178-185,共8页Journal of Harbin Institute of Technology

基　　金：陕西省重点科技创新团队计划(2017KCT-19-01);陕西省重点产业链(群)项目(2017ZDCXL-GY-07-01)

摘　　要：为克服传统悬浮型光催化技术因催化剂分离困难而导致的水体二次污染问题,通过悬浮过滤方式将ZnIn2S4负载在超滤膜表面得到光催化膜.利用扫描电镜(SEM)、紫外-可见漫反射光谱分析(UV-Vis)、X射线光电子能谱分析(XPS)、X射线衍射图谱分析(XRD)对其进行表征并分析其超滤性能.以氟伐他汀为目标污染物,采用功率500 W,光强230 W/m^2的长弧氙灯为光源,考察不同负载量光催化膜在光照条件下对氟伐他汀的降解率.结果表明,随着ZnIn2S4负载量增加,光催化膜对紫外光和可见光的响应逐渐增强,表面Zn、In、S元素特征峰响应逐渐增强,ZnIn2S4六方相型特征衍射峰逐渐增大,膜表面形成了均匀的光催化功能层,膜面亲水性增强,纯水通量衰减得到缓解,对氟伐他汀的降解率明显提高.但是过量ZnIn2S4会在膜面发生堆叠团聚,降低催化剂利用率,进而影响催化效率.负载量为0.2 g的光催化膜表面ZnIn2S4光催化层均匀,能有效利用光源能量,催化活性高,节省物料,在光照条件下对氟伐他汀的降解率可高达94.75%,长期运行下具有良好的光催化稳定性.To overcome the problem caused by the separation photocatalysts from system in the traditional photocatalytic technology, the photocatalytic membrane was prepared by filtrating suspended ZnIn2S4 on the surface of ultrafiltration membrane and was characterized by SEM, UV-Vis, XPS, XRD, and the ultrafiltration performance was also analyzed. The degradation rate of fluvastatin by photocatalytic membranes was investigated under a 500 W xenon lamp with intensity of 230 W/m^2. With the increase of the photocatalyst loading, the absorbance of photocatalytic membrane in ultraviolet and visible light region increased, the characteristic peak response of Zn, In and S elements increased, the diffraction peak of ZnIn2S4 with hexagonal phase increased and the hydrophilicity increased, which indicated that formation of photocatalytic coating layer on the surface. The degradation rate of fluvastatin was also enhanced by formation of photocatalytic coating layer. However, agglomeration of excess ZnIn2S4 on the surface of the membrane leaded to reducing the utilization rate of the photocatalyst and affeced the photocatalytic efficiency. The photocatalytic coating layer of photocatalytic membrane with 0.2 g ZnIn2S4 could be effectively excited by xenon lamp and the degradation rate of fluvastatin was 94.75%.

关 键 词：氟伐他汀 硫化铟锌 光催化功能层 超滤膜 降解性能 

分 类 号：X52[环境科学与工程—环境工程]