Exceptional Visible-Light Activities of TiO2-Coupled N-Doped Porous Perovskite LaFeO3 for 2,4-Dichlorophenol Decomposition and CO2 Conversion

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• 作者：Muhammad Humayun ; Yang Qu ; Fazal Raziq ; Rui Yan ; Zhijun Li ; Xuliang Zhang ; Liqiang Jing
• 刊名：Environmental Science & Technology
• 出版年：2016
• 出版时间：December 20, 2016
• 年：2016
• 卷：50
• 期：24
• 页码：13600-13610
• 全文大小：662K
• ISSN：1520-5851

文摘

In this work, TiO₂-coupled N-doped porous perovskite-type LaFeO₃ nanocomposites as highly efficient, cheap, stable, and visible-light photocatalysts have successfully been prepared via wet chemical processes. It is shown that the amount-optimized nanocomposite exhibits exceptional visible-light photocatalytic activities for 2,4-dichlorophenol (2,4-DCP) degradation by ∼3-time enhancement and for CO₂ conversion to fuels by ∼4-time enhancement, compared to the resulting porous LaFeO₃ with rather high photoactivity due to its large surface area. It is clearly demonstrated, by means of various experimental data, especially for the ·OH amount evaluation, that the obviously enhanced photoactivities are attributed to the increased specific surface area by introducing pores, to the extended visible-light absorption by doping N to create surface states, and to the promoted charge transfer and separation by coupling TiO₂. Moreover, it is confirmed from radical trapping experiments that the photogenerated holes are the predominant oxidants in the photocatalytic degradation of 2,4-DCP. Furthermore, a possible photocatalytic degradation mechanism for 2,4-DCP is proposed mainly based on the resultant crucial intermediate, 2-chlorosuccinic acid with m/z = 153, that readily transform into CO₂ and H₂O. This work opens up a new feasible route to synthesize visible-light-responsive high-activity perovskite-type nanophotocatalysts for efficient environmental remediation and energy production.