环境化学
张海民,全燮,赵慧敏,陈硕,赵雅芝.TiO2/Al2O3复合分离膜的制备及其对染料的去除性能[J].环境科学学报,2006,26(9):1484-1490
TiO2/Al2O3复合分离膜的制备及其对染料的去除性能
- Fabrication of TiO2/Al2O3 composite membrane with photocatalytic capability and its performance in dye removal
- 基金项目：国家自然科学基金重点基金项目(No.20337020);国家重点基础研究发展(973)计划项目(No.2003CB415006);国家杰出青年基金项目(No.20525723)
- 作者
- 单位
- 张海民
- 1. 大连理工大学环境与生命学院, 大连 116024; 2. 工业生态与环境工程教育部重点实验室, 大连 116024
- 全燮
- 1. 大连理工大学环境与生命学院, 大连 116024; 2. 工业生态与环境工程教育部重点实验室, 大连 116024
- 赵慧敏
- 1. 大连理工大学环境与生命学院, 大连 116024; 2. 工业生态与环境工程教育部重点实验室, 大连 116024
- 陈硕
- 1. 大连理工大学环境与生命学院, 大连 116024; 2. 工业生态与环境工程教育部重点实验室, 大连 116024
- 赵雅芝
- 1. 大连理工大学环境与生命学院, 大连 116024; 2. 工业生态与环境工程教育部重点实验室, 大连 116024
- 摘要：以孔径为200nm的Al2O3膜片作为载体,应用溶胶-凝胶方法制备了孔径为50～100nm的TiO2/Al2O3复合分离膜.用XRD、SEM对TiO2膜的物相、TiO2/Al2O3复合分离膜的形貌等进行了分析和表征.根据XRD分析,用Scherrer公式计算复合分离膜中TiO2粒子的平均粒径为22nm,其中锐钛矿相占86%,金红石相占14%.同时,应用TEM、EDX、UV-Vis扩散反射光谱对TiO2/Al2O3复合分离膜的微观结构、组成、性质等进行了进一步调查和研究.通过应用可溶性染料酸性橙Ⅱ作为目标污染物,对TiO2/Al2O3复合分离膜的分离和光催化性能进行了调查和评价.实验结果表明,应用这种具有光催化能力的复合分离膜,持续处理1000mL酸性橙Ⅱ溶液(100mg·L-1)400min,去除率可达80%以上,相对于单独的光催化技术(65%)或单独的膜分离技术(59%),染料的去除效率明显提高.
- Abstract：TiO2 /Al2O3 composite membranes have been successfully fabricated from TiO2 sols on the support of Al2O3. Pore sizes of the resulting membrane were mainly controlled by the sol properties and the immersion time. TiO2 /Al2O3 composite membranes were characterized using SEM, XRD, EDX, TEM and UV-Vis diffuse reflective spectra. The results proved that TiO2 immobilized on the support of Al2O3 had anatase crystal structure within the calcination temperature range. The anatase phase was 86% and the average particle size of TiO2 was 22 nm. Acid Orange Ⅱ was used as a test pollutant for the investigation of the multifunctions of photocatalysis and separation of the composite membrane. The influence of various experimental parameters was investigated to obtain high photocatalytic reaction rates, operating stability and high membrane rejection. By coupling membrane separation with photocatalysis technique, the removal efficiency of Acid Orange Ⅱ was improved remarkably being 80% within 400 min, while the values were 65% with photocatalysis alone and 59% with membrane separation alone during the same time, respectively. Good photocatalytic activity of composite membrane under UV irradiation helped to obtain high permeate flux of the composite membrane and prevent the composite membrane from fouling.
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