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Rational construction of direct Z-scheme doped perovskite/palygorskite nanocatalyst for photo-SCR removal of NO: Insight into the effect of Ce incorporation
摘要： V-Ti oxide catalyst has been widely employed in selective catalytic reduction (SCR) of NOx in industry. However, considerable cost and high reaction temperatures are commonly required. Alternatively, photo-SCR working at low temperature has attracted widespread interest. In the present work, Pr1(cid:1)xCexFeO3/palygorskite (Pal) nanocomposite was synthesized by an in situ sol-gel method. Results indicate that Pr1(cid:1)xCexFeO3 remain as a perovskite solid solution uniformly immobilized on the surface of Pal when x is less than 0.05. CeO2 co-precipitates with Pr1(cid:1)xCexFeO3 when x is beyond 0.05, leading to an enhanced charge separation induced by the formation of intimate direct Z-scheme heterostructure of Pr1(cid:1)xCexFeO3/CeO2, which is unraveled by the photoluminescence spectroscopy and Mott-Schottky analysis and further verified by the DFT calculations. Under visible light irradiation, the influence of the doping amount of Ce (from 0.05 to 0.5) on the NO conversion and N2 selectivity was investigated. The Pr0.7Ce0.3FeO3/Pal was found to achieve the highest NO conversion rate of 92% and 99% N2 selectivity. In addition, the SO2 and H2O resistance experiment show that the doping of Ce could benefit the formation of cerium sulphate which prevents NH3 from being sulfated by SO2 while Pal prevents the catalysts from being corroded by H2O, respectively.
关键词： Direct Z-scheme,Photo-SCR,Palygorskite,Denitrification,CeO2,Perovskite
更新于2025-09-10 09:29:36
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Upconversion Tm3+:CeO2/Palygorskite as direct Z-scheme heterostructure for photocatalytic degradation of bisphenol A
摘要： Novel Tm3+:CeO2/palygorskite (Pal) nanocomposites were prepared by a hydrothermal-deposition method. X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis spectrum（UV-Vis）, photoluminescence spectroscopy（PL）and Mott-Schottky analysis were employed to characterize the products. Results indicated that Pal skeleton possessed abundant adsorption sites and shortened band gap after modified by hydrochloric acid. Tm3+ doping enhanced the utilization of solar light due to its upconversion from visible to ultraviolet light. Meanwhile, the adsorption edge of the Tm3+:CeO2 was extended to visible region with the formation of heterojunctions. The product intimated Tm3+:CeO2/Pal behaved strongest upconversion luminescence when the doping fraction of Tm3+ was optimized to be 0.02, and the photocatalytic degradation of bisphenol A (BPA) reached 86 % when the mass content of Tm3+:CeO2 as compared to Pal was optimized to 10 wt%. The direct Z-scheme system was constructed between Pal and Tm3+:CeO2 leading to the improved charge-separation efficiency and maintenance of high redox potential.
关键词： CeO2,Upconversion,Palygorskite,Photocatalysis,Z-scheme
更新于2025-09-04 15:30:14