Enhanced Cr(VI) reduction by direct transfer of photo-generated electrons to Cr 3d orbitals in CrO42--intercalated BiOBr with exposed (110) facets

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 中国科学院饮用水科学与技术重点实验室

	Enhanced Cr(VI) reduction by direct transfer of photo-generated electrons to Cr 3d orbitals in CrO42--intercalated BiOBr with exposed (110) facets
	Li, Tong; Gao, Yaowen; Zhang, Lili; Xing, Xueci; Huang, Xuan; Li, Fan; Jin, Yang; Hu, Chun
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2020-11-15
卷号	277 页码:1-8
关键词	BiOBr Intercalated topological transformation Dual-impurity levels Facet-dependent photoreduction of Cr (VI)
ISSN号	0926-3373
英文摘要	The adsorptive behavior and photoreduction processes of CrO42- were investigated in 110-BiOBr and 001-BiOBr suspensions without/with visible-light irradiation. On the basis of X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) measurements, CrO42- ions were adsorbed on the surface of 001-BiOBr in the form of = Bi-O-Cr-O-3- complexes, and their photoreduction depended on the pH of the solution. By contrast, CrO42- were predominantly intercalated into the bulk of 110-BiOBr, forming [OBi](+)-(O-CrO2-O)(2-)-[BiO](+) complexes. It was found that 110-BiOBr showed higher efficiency for photoreduction of CrO42- at pH 2 and 7. Density functional theory (DFT) calculation further revealed that both the acceptor Cr 3d and donor O 2p of CrO42- impurity levels were introduced into 110-BiOBr bulk, enlarging the visible absorption range of BiOBr. Therefore, the photoreduction of Cr(VI) occurred by direct photo-generated electron transfer from the improved valence band of 110-BiOBr to the Cr 3d orbitals for reduction of Cr(VI) to Cr(III) without the involvement of H+.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/45284]
专题	生态环境研究中心_中国科学院饮用水科学与技术重点实验室
推荐引用方式 GB/T 7714	Li, Tong,Gao, Yaowen,Zhang, Lili,et al. Enhanced Cr(VI) reduction by direct transfer of photo-generated electrons to Cr 3d orbitals in CrO42--intercalated BiOBr with exposed (110) facets[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2020,277:1-8.
APA	Li, Tong.,Gao, Yaowen.,Zhang, Lili.,Xing, Xueci.,Huang, Xuan.,...&Hu, Chun.(2020).Enhanced Cr(VI) reduction by direct transfer of photo-generated electrons to Cr 3d orbitals in CrO42--intercalated BiOBr with exposed (110) facets.APPLIED CATALYSIS B-ENVIRONMENTAL,277,1-8.
MLA	Li, Tong,et al."Enhanced Cr(VI) reduction by direct transfer of photo-generated electrons to Cr 3d orbitals in CrO42--intercalated BiOBr with exposed (110) facets".APPLIED CATALYSIS B-ENVIRONMENTAL 277(2020):1-8.