Efficient visible-light-induced photocatalytic reduction of 4-nitroaniline to p-phenylenediamine over nanocrystalline PbBi₂Nb₂O₉

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• 作者：Weiming Wu ; Guodong Liu ; Shijing Liang ; Yan Chen ; Lijuan Shen ; Huarong Zheng ; Rusheng Yuan ; Yidong Hou ; Ling Wu ; ^{wuling@fzu.edu.cn}
• 关键词：PbBi2Nb2O9 ; Nanocrystalline ; Nitro reduction ; Photocatalysis ; Visible light
• 刊名：Journal of Catalysis
• 出版年：2012
• 出版时间：June, 2012
• 年：2012
• 卷：290
• 期：Complete
• 页码：13-17
• 全文大小：660 K

文摘

Nanocrystalline PbBi₂Nb₂O₉ was successfully prepared by a modified sol-gel method. The as-prepared nanocrystalline PbBi₂Nb₂O₉ was an active visible-light-driven photocatalyst for the photoreduction of 4-nitroaniline to p-phenylenediamine in aqueous solution upon purging with N₂. Its photocatalytic activity was determined by the balance between the surface area and crystallinity. The best sample was obtained after calcination at 650 ¡ãC, giving 4-nitroaniline conversion of ?00 % and p-phenylenediamine selectivity of ?9 % after irradiation for 150 min, which was much higher than those of bulk PbBi₂Nb₂O₉ and TiO_{2?/sub>xNx photocatalysts. Further experiments revealed that oxalate anion (as a hole scavenger) was indispensable for the photocatalytic reduction of 4-nitroaniline. Moreover, on the basis of the electron spin resonance analysis result, a mechanism was proposed to explain the photoreduction of 4-nitroaniline over nanocrystalline PbBi2Nb2O9.}