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Partially coated TiO2 on Al2O3 membrane for high water flux and photodegradation by novel filtration strategy in photocatalytic membrane reactors
Chemical Engineering Research and Design ( IF 3.9 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.cherd.2020.08.027
Rizwan Ahmad , Chang Soo Lee , Jong Hak Kim , Jeonghwan Kim

Partially coated TiO2 (pc-TiO2) layer on the porous Al2O3 membrane substrate was developed by using low-cost poly (vinyl chloride) (PVC) to generate interstitial voids to be applied in a photocatalytic membrane reactor for the treatment of organic dye contaminant. The combination of dead-end filtration with cross-flow filtration under intermittent UV irradiation onto a developed composite ceramic membrane was suggested to reduce the membrane fouling effectively. Our study showed that the water flux and anti-fouling properties of the pc-TiO2/Al2O3 composite membrane was much higher than those of uniformly coated TiO2 (uc-TiO2)/Al2O3. Cross-flow membrane filtration provided a much greater synergistic impact on photocatalytic activity for both uc- and pc-TiO2/Al2O3 composite membranes than Al2O3 bare membrane substrate. Less fouling caused by hydrodynamic shear along the membrane surface is thought to be associated with better accessibility of UV irradiation by the reactive surface of the TiO2/Al2O3 composite membrane, promoting the photodegradation of the organic dye contaminant in water filtration.



中文翻译:

在Al 2 O 3膜上部分涂覆的TiO 2通过光催化膜反应器中的新型过滤策略实现高水通量和光降解

通过使用低成本的聚氯乙烯(PVC)来产生多孔Al 2 O 3膜基材上的部分涂覆的TiO 2(pc-TiO 2)层,以产生间隙空隙,该间隙将应用于光催化膜反应器中进行处理。有机染料污染物。建议在间歇性紫外线照射下,将死端过滤和错流过滤结合到已开发的复合陶瓷膜上,以有效减少膜结垢。我们的研究表明pc-TiO 2 / Al 2 O 3复合膜的水通量和防污性能远高于均匀涂覆的TiO 2(uc-TiO2)/ Al 2 O 3。错流膜过滤对uc-和pc-TiO 2 / Al 2 O 3复合膜的光催化活性的影响要比Al 2 O 3裸膜基材大得多。沿着膜表面的流体动力剪切引起的较少的污垢被认为与TiO 2 / Al 2 O 3复合膜的反应性表面的UV辐射的更好可及性有关,从而促进了水过滤中有机染料污染物的光降解。

更新日期:2020-09-15
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