Enhanced photocatalytic reduction of aqueous Re(VII) in ambient air by amorphous TiO2/g-C3N4 photocatalysts: Implications for Tc(VII) elimination

doi:10.1016/j.cej.2020.125977

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	Enhanced photocatalytic reduction of aqueous Re(VII) in ambient air by amorphous TiO2/g-C3N4 photocatalysts: Implications for Tc(VII) elimination
	Deng, Hao ; Wang, Xu-cong ; Wang, Lin ; Li, Zi-jie ; Liang, Peng-liang ; Ou, Jin-zhao ; Liu, Kang ; Yuan, Li-yong ; Jiang, Zhong-yi ; Zheng, Li-rong
刊名	CHEMICAL ENGINEERING JOURNAL
	2020
卷号	401
关键词	EFFICIENT CHARGE SEPARATION GRAPHITIC CARBON NITRIDE VISIBLE-LIGHT TECHNETIUM TIO2 OXIDATION PERFORMANCE PERTECHNETATE SEMICONDUCTOR GRAPHENE
DOI	10.1016/j.cej.2020.125977
英文摘要	Although effective photocatalytic removal for aqueous ReO4- (as a chemical analogue of TcO4-) have been established, photocatalysts are not satisfactory for further applications in term of low light harvesting efficiency and fast re-dissolution of ReO2 center dot nH(2)O. Herein, the amorphous TiO2/g-C3N4 composites are fabricated by a simple hydrolysis approach, producing the amorphous TiO2/30 wt% g-C3N4 (TCN-3) composite with larger specific surface area (similar to 456 m(2) g(-1)), narrow band gap (similar to 2.67 eV) and excellent light-capturing ability when compared with commercial P25. Lower recombination efficiency of photo-generated electron-hole based on the Z-scheme mechanism between amorphous TiO2 and g-C3N4 was demonstrated by electron paramagnetic resonance and photoelectrochemical analysis. In addition, the as-synthesized TCN-3 exhibits an excellent photocatalytic reduction of Re(VII) in ambient air with the highest removal percentage of similar to 90% as compared with crystalline TiO2/g-C3N4, and can be regenerated even after eight recycles. X-ray absorption spectroscopy confirmed that the extremely slow re-dissolution of Re(IV) resulted from both shortening of ReO2 center dot nH(2)O chains (decrease in coordination number of Re-Re) and association of Re(IV) with amorphous TiO2 in TCN-3 (formation of Re-Ti bond). The overall results further facilitate the photocatalytic reduction and elimination for rhenium/technetium, and open the wide-range applications for photocatalysis in the disposal of some radioactive elements.
学科主题	Engineering
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/20324]
专题	2020专题
作者单位	1.Shi, WQ (corresponding author), Chinese Acad Sci, Inst High Energy Phys, Lab Nucl Energy Chem, Beijing 100049, Peoples R China. 2.Jiang, ZY (corresponding author), Tianjin Univ, Sch Chem Engn & Technol, Minist Educ, Key Lab Green Chem Technol, Tianjin 300072, Peoples R China. 3.Wang, L
推荐引用方式 GB/T 7714	Deng, Hao,Wang, Xu-cong,Wang, Lin,et al. Enhanced photocatalytic reduction of aqueous Re(VII) in ambient air by amorphous TiO2/g-C3N4 photocatalysts: Implications for Tc(VII) elimination[J]. CHEMICAL ENGINEERING JOURNAL,2020,401.
APA	Deng, Hao.,Wang, Xu-cong.,Wang, Lin.,Li, Zi-jie.,Liang, Peng-liang.,...&Shi, Wei-qun.(2020).Enhanced photocatalytic reduction of aqueous Re(VII) in ambient air by amorphous TiO2/g-C3N4 photocatalysts: Implications for Tc(VII) elimination.CHEMICAL ENGINEERING JOURNAL,401.
MLA	Deng, Hao,et al."Enhanced photocatalytic reduction of aqueous Re(VII) in ambient air by amorphous TiO2/g-C3N4 photocatalysts: Implications for Tc(VII) elimination".CHEMICAL ENGINEERING JOURNAL 401(2020).