Owing to the merits of high catalytic activity, Pd-supported materials have received extensive attention. However, those materials always require complex and high-cost synthetic processes such as high-temperature calc...Owing to the merits of high catalytic activity, Pd-supported materials have received extensive attention. However, those materials always require complex and high-cost synthetic processes such as high-temperature calcination or 1-12 reduction, which seriously hinder their wide applications. In this work, a novel Pd reduction method was developed for Pd-supported TiO2 catalysts, in which the Pd2~ ions were partly reduced and homogeneously loaded on the surface of 8 nm TiO2 with the assistance of pre-produced surface Ti3＋ ions. This facile preparation is calcination-free and cost-low. The excellent catalysts can produce H2 33 mmol/g/h under UV-vis light irradiation, and degrade nearly 10% methyl orange in 1 h visible-light irradiation, which is much higher than that of unloaded TiO2 or Pd/TiO2 prepared by traditional high-temperature calcination methods. Moreover, the resulting Pd-supported TiO2 nano-catalysts are also effective for colorless phenol degradation under visible-light. The reasons for these superior activities can be assigned to the co-existence of Pd~ and Pd2~ on the surface of TiO2 nanoparticles, which is closely related to the calcination-free synthetic process. UV-Vis absorbance spectra show that the obtained 0.53Pd/TiO2 is visible-light-driven and nitrogen physisorption isotherms indicate a high specific surface area of 203 m2/g. The preparation method reported herein may provide hints for obtaining other high photocatalytic activity Pd-based supported catalysts for hydrogen generation and methylene orange degradation.展开更多
基金Supported by National Natural Science Function of China(No.91022018,21025104)National Basic Research Program of China(No.2011CBA00501,2013CB933203)
文摘Owing to the merits of high catalytic activity, Pd-supported materials have received extensive attention. However, those materials always require complex and high-cost synthetic processes such as high-temperature calcination or 1-12 reduction, which seriously hinder their wide applications. In this work, a novel Pd reduction method was developed for Pd-supported TiO2 catalysts, in which the Pd2~ ions were partly reduced and homogeneously loaded on the surface of 8 nm TiO2 with the assistance of pre-produced surface Ti3＋ ions. This facile preparation is calcination-free and cost-low. The excellent catalysts can produce H2 33 mmol/g/h under UV-vis light irradiation, and degrade nearly 10% methyl orange in 1 h visible-light irradiation, which is much higher than that of unloaded TiO2 or Pd/TiO2 prepared by traditional high-temperature calcination methods. Moreover, the resulting Pd-supported TiO2 nano-catalysts are also effective for colorless phenol degradation under visible-light. The reasons for these superior activities can be assigned to the co-existence of Pd~ and Pd2~ on the surface of TiO2 nanoparticles, which is closely related to the calcination-free synthetic process. UV-Vis absorbance spectra show that the obtained 0.53Pd/TiO2 is visible-light-driven and nitrogen physisorption isotherms indicate a high specific surface area of 203 m2/g. The preparation method reported herein may provide hints for obtaining other high photocatalytic activity Pd-based supported catalysts for hydrogen generation and methylene orange degradation.
