TY - JOUR
T1 - Improved visible-light photoactivities of porous LaFeO3 by coupling with nanosized alkaline earth metal oxides and mechanism insight
AU - Khan, Iltaf
AU - Sun, Ning
AU - Zhang, Ziqing
AU - Li, Zhijun
AU - Humayun, Muhammad
AU - Ali, Sharafat
AU - Qu, Yang
AU - Jing, Liqiang
N1 - Publisher Copyright:
© The Royal Society of Chemistry 2019.
PY - 2019
Y1 - 2019
N2 - It is of significance to simultaneously enhance the charge separation and promote the surface reactant activation in photocatalysis. To this end, nanosized SrO coupled porous LaFeO3 (PLFO) nanocomposites have been successfully prepared via a one-pot carbon-sphere-hard-template (CSHT) method. Compared with bare PLFO, the as-prepared optimized nanocomposite exhibits high visible-light photoactivities as shown by over 6-fold and 1.8-fold enhancement for CO2 conversion and for 2,4-dichlorophenol (2,4-DCP) degradation, respectively. Based on the surface photovoltage spectra (SPS), fluorescence spectra (FS) related to the produced OH amount, and temperature programmed desorption (TPD) and electrochemical reduction curves, it is demonstrated that the exceptional visible-light photoactivities are mainly attributed to the large surface area due to the porous structure, and the introduced nanosized SrO which acts not only as a platform to accept high level energy electrons (HLEEs) to enhance the charge separation but also as an activator to adsorb and catalyze CO2 (O2) to promote the surface chemical reactions. Additionally, this efficient strategy is versatile for other alkaline earth metal oxides, such as MgO, CaO and BaO. In comparison with the different alkaline earth metal oxide modifications, it is proven that SrO is the best one to couple with PLFO, attributed to it having the most enhanced charge separation and greatest ability to adsorb and catalyze CO2 (O2). This work concludes that alkaline earth metal oxide modification is feasible for the promotion of the photocatalytic activity for CO2 conversion and organic pollutant degradation.
AB - It is of significance to simultaneously enhance the charge separation and promote the surface reactant activation in photocatalysis. To this end, nanosized SrO coupled porous LaFeO3 (PLFO) nanocomposites have been successfully prepared via a one-pot carbon-sphere-hard-template (CSHT) method. Compared with bare PLFO, the as-prepared optimized nanocomposite exhibits high visible-light photoactivities as shown by over 6-fold and 1.8-fold enhancement for CO2 conversion and for 2,4-dichlorophenol (2,4-DCP) degradation, respectively. Based on the surface photovoltage spectra (SPS), fluorescence spectra (FS) related to the produced OH amount, and temperature programmed desorption (TPD) and electrochemical reduction curves, it is demonstrated that the exceptional visible-light photoactivities are mainly attributed to the large surface area due to the porous structure, and the introduced nanosized SrO which acts not only as a platform to accept high level energy electrons (HLEEs) to enhance the charge separation but also as an activator to adsorb and catalyze CO2 (O2) to promote the surface chemical reactions. Additionally, this efficient strategy is versatile for other alkaline earth metal oxides, such as MgO, CaO and BaO. In comparison with the different alkaline earth metal oxide modifications, it is proven that SrO is the best one to couple with PLFO, attributed to it having the most enhanced charge separation and greatest ability to adsorb and catalyze CO2 (O2). This work concludes that alkaline earth metal oxide modification is feasible for the promotion of the photocatalytic activity for CO2 conversion and organic pollutant degradation.
UR - https://www.scopus.com/pages/publications/85067664607
U2 - 10.1039/c9cy00127a
DO - 10.1039/c9cy00127a
M3 - Article
AN - SCOPUS:85067664607
SN - 2044-4753
VL - 9
SP - 3149
EP - 3157
JO - Catalysis Science and Technology
JF - Catalysis Science and Technology
IS - 12
ER -
