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首页> 外文期刊>Separation and Purification Technology >Fabrication of photocatalytic membrane and evaluation its efficiency in removal of organic pollutants from water
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Fabrication of photocatalytic membrane and evaluation its efficiency in removal of organic pollutants from water

机译：光催化膜的制备及其从水中去除有机污染物的效率

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TiO_2/Al_2O_3 composite membranes with photocatalytic capability have been successfully prepared from colloidal titania sols by the sol-gel technique.Pore sizes of the resulting membrane were mainly controlled by the sol properties and the immersion time.A preliminary investigation of the sol-gel process,the membrane characterization and the stability of composite membrane were carried out using IR-spectra,scanning electron microscopy(SEM),X-ray diffraction(XRD).The results proved that TiO_2 immobilized on the support of AI_2O_3 had anatase crystal structure in the calcination temperature range.Direct Black 168 was used as the test pollutant for investigation of the multifunctions of photocatalysis and separation of TiO_2/Al_2O_3 composite membrane.Some operational parameters such as the pressure in the membrane cell,the initial pH and air flow were determined and the influence of various parameters was also discussed to obtain high reaction rates,high membrane rejection and operating stability.The removal of Direct Black 168 with UV irradiation alone achieved 70% and the retention of the dye with membrane filtration alone reached 65% after 300 min in the continuous system.By combining the photocatalysis with membrane techniques,the removal efficiency of the dye was improved markedly and reached 82% after 300 min.Although the dye was not completely decomposed by photocatalysis,the degradation of the dye helped to enhance the composite membrane flux and prevent membrane fouling.It was possible to treat successfully Direct Blackl68 solutions(100 mg/L)by means of a continuous process obtaining good values of permeate fluxes(82 L/m~2 h).The TO_2/Al_2O_3 composite membrane with photocatalytic function could be interesting for water purification.
机译：溶胶-凝胶法成功地从胶体二氧化钛溶胶中制备出具有光催化性能的TiO_2 / Al_2O_3复合膜，其膜孔尺寸主要受溶胶性质和浸没时间的影响。通过红外光谱，扫描电子显微镜（SEM），X射线衍射（XRD）等手段对复合膜的表征和稳定性进行了研究。结果表明，固定在AI_2O_3载体上的TiO_2在其表面具有锐钛矿型晶体结构。直接黑168用作测试污染物，研究TiO_2 / Al_2O_3复合膜的光催化和分离的多功能性。确定了一些操作参数，例如膜池中的压力，初始pH值和空气流量，以及还讨论了各种参数的影响以获得高反应速率，高膜截留率和操作在连续系统中300分钟后，仅用UV辐射去除Direct Black 168的效果就达到70％，而仅通过膜过滤去除染料的保留率达到了65％。通过将光催化与膜技术相结合，可以去除染料显着改善并在300分钟后达到82％。尽管染料没有被光催化完全分解，但染料的降解有助于提高复合膜通量并防止膜结垢。可以成功处理100mg直接Blackl68溶液/ L）通过连续过程获得良好的渗透通量值（82 L / m〜2 h）。具有光催化功能的TO_2 / Al_2O_3复合膜可能对水的净化很有用。

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