Wang Yangang, Bai Xia, Wang Fei, Kang Shifei, Yin Chaochuang, Li Xi
College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China; Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China.
J Hazard Mater. 2019 Jun 15;372:69-76. doi: 10.1016/j.jhazmat.2017.10.007. Epub 2017 Oct 5.
Chromium doped mesoporous CeO catalysts were synthesized via a simple nanocasting route by using silica SBA-15 as the template and metal nitrates as precursors. The effect of Cr doping concentration (5%, 10%, 15% and 20% of the initial Cr/(Cr+Ce) molar percentage) on the structures of these catalysts and their photocatalytic performances in reduction of CO with HO were investigated. The results indicated that the introduction of Cr species could effectively extend the spectral response range from UV to visible light region (400-700nm) and improve the electronic conductivity for the mesoporous CeO catalysts which exhibited an enhanced photocatalytic activity in the reduction of CO with HO when compared with the non-doped counterpart. The highest CO and CH yield of 16.2μmol/g-cat. and 10.1μmol/g-cat., respectively, were acquired on the optimal chromium doped CeO catalyst with the initial Cr(Cr+Ce) molar percentage of 15% under 8h visible-light irradiation, which were more than twice as high as that of bare CeO. The remarkably increased photocatalytic performance should be attributed to the advantageous structural and compositional features of the chromium doped mesoporous CeO.
通过以二氧化硅SBA - 15为模板、金属硝酸盐为前驱体，采用简单的纳米铸造路线合成了铬掺杂的介孔CeO催化剂。研究了Cr掺杂浓度（初始Cr/(Cr + Ce)摩尔百分比的5%、10%、15%和20%）对这些催化剂结构及其在以HO还原CO中的光催化性能的影响。结果表明，Cr物种的引入可有效将光谱响应范围从紫外光扩展到可见光区域（400 - 700nm），并提高介孔CeO催化剂的电子导电性，与未掺杂的对应物相比，该催化剂在以HO还原CO中表现出增强的光催化活性。在初始Cr/(Cr + Ce)摩尔百分比为15%的最佳铬掺杂CeO催化剂上，在8小时可见光照射下，分别获得了最高的CO和CH产率，分别为每克催化剂16.2μmol和10.1μmol，这比纯CeO的产率高出两倍多。光催化性能的显著提高应归因于铬掺杂介孔CeO有利的结构和组成特征。
