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Morphology effect of honeycomb-like inverse opal for efficient photocatalytic water disinfection and photodegradation of organic pollutant
Molecular Catalysis ( IF 3.9 ) Pub Date : 2017-10-31 , DOI: 10.1016/j.mcat.2017.10.030
Yuanyuan Zhang , Lili Wang , Dandan Liu , Yangyang Gao , Chao Song , Yongsheng Shi , Dan Qu , Jinsheng Shi

Morphology is crucial component to achieve high photon utilization efficiency and efficient photocatalytic activity. In this work, novel honeycomb-like inverse opals were fabricated by a simple sol-gel method combined with a self-assembly polystyrene (PS) opal as template. The obtained materials exhibit unique 3D ordered porous structure with center-to-center distance of about 200 nm, which lead to periodic modulations of light propagation and strengthen light absorption of materials. Photocatalytic activity of TiO2 with morphology of honeycomb and bulk, with or without doping Mg2+ was comparatively investigated by disinfection of bacteria and photodegradation of organic pollutant. Morphology evolution of TiO2 from bulk to honeycomb would increase specific surface area and strengthen light adsorption, which could largely strengthen photocatalytic activity of honeycomb-like TiO2. After Mg2+ is doped, it was found that Mg-TiO2 systems exhibited much higher activity than their counterpart due to decreased band gap. In this way, water disinfection of 100% inactivation of bacteria was achieved under visible light. Highly reactive h+ and O2 were found to be major reactive species and a possible mechanism was reasonably proposed.



中文翻译:

蜂窝状反蛋白石的形态学效应用于有效的光催化水消毒和有机污染物的光降解

形态是实现高光子利用效率和有效光催化活性的关键组成部分。在这项工作中,新颖的蜂窝状反蛋白石是通过简单的溶胶-凝胶法与自组装聚苯乙烯(PS)蛋白石相结合制成的。所获得的材料表现出独特的3D有序多孔结构,中心距大约为200 nm,这导致光传播的周期性调制并增强了材料的光吸收。通过细菌消毒和有机污染物的光降解,比较研究了蜂窝状和块状,掺杂或不掺杂Mg 2+的TiO 2的光催化活性。TiO 2的形貌演变从块状到蜂窝状,将增加比表面积并增强光吸收,从而可大大增强蜂窝状TiO 2的光催化活性。掺杂Mg 2+后,发现由于带隙减小,Mg-TiO 2系统显示出比其对应的系统高得多的活性。以这种方式,在可见光下实现了100%灭活细菌的水消毒。高反应性^ h +Ø 2 -被认为是主要的活性物质和可能的机理进行了合理的建议。

更新日期:2017-10-31
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