期刊
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
卷 94, 期 5, 页码 1576-1584出版社
WILEY
DOI: 10.1002/jctb.5923
关键词
doped CeO2; visible-light photocatalyst; oxygen vacancy; wastewater treatment
类别
资金
- National Natural Science Foundation of China [51408256, 21677180, 21777196]
- Natural Science Foundation of Guangdong Province [2014A030313218]
- Science and Technology Key Projects of Guangdong Province [2014B020216004, 2015B020237005]
- Science and Technology Research Programs of Guangzhou City [201510010083]
BACKGROUNDIron (Fe)(3+) has much a smaller ion radius than cerium (Ce)(4+) but praseodymium (Pr) ions have a similar radius to Ce ions with the same valence. Hence, it is interesting to tune the structural properties, including lattice deformation, band gap and oxygen vacancy (O-v), of CeO2 by Pr and Fe codoping for enhanced visible-light catalytic activity. RESULTSA series of Ce1-x-yPrxFeyO2-sigma (x=0 approximate to 0.012, y=0.003 approximate to 0.031) nanoparticles were prepared by a simple one-step sol-gel method. The structural properties of CeO2, including crystal deformation (cell lattice from 5.4069 to 5.4195), band gap (from 2.20 to 2.93), oxygen vacancies (O-v from 0.15% to 9.03%), and peroxide species (O-2(2-) from 0.37% to 1.09%) can be finely tuned by Pr and Fe codoping. Among ten samples, Ce0.982Pr0.003Fe0.015O2-sigma with proper structural properties showed the highest photocatalytic activity towards the degradation of acid orange 7. The first reaction rate constant reaches 0.0687min(-1), 9.3 and 7.7 times that of Ce0.994Pr0.006O2-sigma and Ce0.985Fe0.015O2-sigma, respectively. The mechanism was found to involve OH , O- 2(-) and photogenerated holes. CONCLUSIONThe structural properties of CeO2 can be finely and easily tuned by Pr and Fe codoping. Thus, the photocatalytic activity of CeO2 under visible light irradiation was boosted. (c) 2019 Society of Chemical Industry
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据