溴酸盐是臭氧处理含溴离子的原水后生成常规水处理工艺难以去除的2B级(较高致癌可能性)潜在致癌物。本文采用一步水热法制备Eu-TiO2光催化剂,以提高二氧化钛光催化去除水中溴酸盐效率。利用X射线光电子能谱(XPS)、荧光光谱(PL)、X射线衍...溴酸盐是臭氧处理含溴离子的原水后生成常规水处理工艺难以去除的2B级(较高致癌可能性)潜在致癌物。本文采用一步水热法制备Eu-TiO2光催化剂,以提高二氧化钛光催化去除水中溴酸盐效率。利用X射线光电子能谱(XPS)、荧光光谱(PL)、X射线衍射(XRD)、紫外可见漫反射(UV-vis DRS)等手段对制备的Eu-TiO2材料进行了表征。本实验复合材料具有较窄的禁带宽度,Eu元素的掺杂后Eu-TiO2材料中Eu的掺杂使得{101}晶面得到加强,同时抑制了电子-空穴对的复合,催化剂禁带宽度从2.92 e V窄化至2.71 e V,一定程度上拓宽了催化剂的光响应范围,从而显著地提高了催化活性。重复性试验表明,Eu-TiO2材料去除溴酸盐的重复性和稳定性良好,说明Eu-TiO2是一具有应用前景的光催化剂。展开更多
Under the background of increasing energy crisis and global warming,semiconductor-based photocatalysis has received tremendous attention due to its potential application in green energy production,CO_(2) reduction and...Under the background of increasing energy crisis and global warming,semiconductor-based photocatalysis has received tremendous attention due to its potential application in green energy production,CO_(2) reduction and pollutant degradation.The photocatalytic activity of semiconductors,however,remains low due to issues like fast recombination of photo-generated electron-hole pairs,limited electron mobility,restricted optical absorption or insufficient active sites.Designing appropriate heterojunctions is proved to be a promising method to address most of these issues and thus to improve the photocatalytic performance.In this review,the working mechanism of various heterojunctions is presented systematically.The most recent advances of strategies in designing and preparing efficient heterojunction photocatalysts are further summarized and some perspectives on the future directions in this field are provided.展开更多
文摘溴酸盐是臭氧处理含溴离子的原水后生成常规水处理工艺难以去除的2B级(较高致癌可能性)潜在致癌物。本文采用一步水热法制备Eu-TiO2光催化剂,以提高二氧化钛光催化去除水中溴酸盐效率。利用X射线光电子能谱(XPS)、荧光光谱(PL)、X射线衍射(XRD)、紫外可见漫反射(UV-vis DRS)等手段对制备的Eu-TiO2材料进行了表征。本实验复合材料具有较窄的禁带宽度,Eu元素的掺杂后Eu-TiO2材料中Eu的掺杂使得{101}晶面得到加强,同时抑制了电子-空穴对的复合,催化剂禁带宽度从2.92 e V窄化至2.71 e V,一定程度上拓宽了催化剂的光响应范围,从而显著地提高了催化活性。重复性试验表明,Eu-TiO2材料去除溴酸盐的重复性和稳定性良好,说明Eu-TiO2是一具有应用前景的光催化剂。
文摘Under the background of increasing energy crisis and global warming,semiconductor-based photocatalysis has received tremendous attention due to its potential application in green energy production,CO_(2) reduction and pollutant degradation.The photocatalytic activity of semiconductors,however,remains low due to issues like fast recombination of photo-generated electron-hole pairs,limited electron mobility,restricted optical absorption or insufficient active sites.Designing appropriate heterojunctions is proved to be a promising method to address most of these issues and thus to improve the photocatalytic performance.In this review,the working mechanism of various heterojunctions is presented systematically.The most recent advances of strategies in designing and preparing efficient heterojunction photocatalysts are further summarized and some perspectives on the future directions in this field are provided.
