NDLI: Introduction of $CoCl_{2}·6H_{2}O$ into $Co_{3}O_{4}$ for enhancement of hydroxyl radicals and effective charge separation

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Li, Fa-tang Liu, Ying Liu, Rui-hong Li, Yu-pei Zhao, Jun Hao, Ying-juan Wang, Xiao-jing
Description	Author Affiliation: Hao YJ ( College of Science, Hebei University of Science and Technology, Shijiazhuang 050018, China. lifatang@126.com.)
Abstract	Porous sphere-like tricobalt tetraoxide $(Co_{3}O_{4})–cobalt$ chloride hydrate $(CoCl_{2}·6H_{2}O,$ CCH) heterojunctions are obtained using a one-step facile solution combustion route. The heterostructure is confirmed by XRD, HRTEM, and XPS measurements. Their photocatalytic performances are evaluated by the degradation of methyl orange (MO) and the reduction removal of Cr(VI) ions under visible light irradiation. The heterojunction containing 81.5 wt% $Co_{3}O_{4}$ and 18.5 wt% CCH exhibits the highest photocatalytic performance, for which the pseudo-first-order reaction rate constant is 10.0 and 8.7 times that of pure $Co_{3}O_{4}$ towards MO degradation and Cr(VI) reduction, respectively. This enhancement in activity can be attributed to the effective electron transfer from the conduction band of $Co_{3}O_{4}$ to that of CCH, which is verified with a double increase of the photocurrent valve of the heterojunction sample electrode in comparison with the bare $Co_{3}O_{4}$ sample electrode. Electron paramagnetic resonance, fluorescence spectrophotometry and scavenger experiments indicate that photo-induced holes, and hydroxyl and superoxide anion radicals are the active species responsible for the photo-oxidation of MO. The reasons for the formation of these species are discussed and proposed based on the band gap structures of $Co_{3}O_{4}$ and CCH. The recycling experiment results indicate that the activity can be regained by a remedial experiment.
ISSN	14779226
Issue Number	6
Journal	Dalton Trans.
Volume Number	45
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2016-02-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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