Fabricatie Noble Metal/Zinc Oxide (Titanium Dioxide) Complex And Catalytic Application

The rapid development of various industries is usually at the expense of over-exploiting and polluting the environment,especially the aquatic one,because a wide range of industries involve dealing with wastewater that contains a high concentration of organic and inorganic pollutants.In this context,highly efficient,economical,low-consumption,convenient and relatively green methods are needed to handle the increasing quantities of organic pollutants,especially the water-soluble aromatic ones.The noble metal and oxide nanocrystals are promising materials in the fields of catalysis,energy and the environment.To remedy the drawback of singe components,some method can been used to construction the noble metaloxide nanocrystal hybrids（MOHs）.In this paper,a general route was developed for constructing MOHs with intimate interfacial contact based on the coordination of an organic agent with multiple kinds of metal precursors.The concrete research content is as follows:Firstly,the Ag/ZnO hybrids with good interface contact were finally formed based on the coordination assembly method.This method is feasible through the experiment and it is easy to control the amount of metal nanoparticles in the composites by controlling the feeding ratio.The hybrids can be used as effective catalysts for the photocatalytic degradation of pollutants.Secondly,the Ag/ZnO hybrids with good interface contact were finally formed Using gelatin biomass as complexing agent coordination.Under optimized conditions,the Ag/ZnO-400-1 showed a rate approximately 1.5 times higher than that of Degussa P25 TiO₂ for the degradation of rhodamine B.The Ag/ZnO can also act as an effective catalyst for the reduction of p-nitrophenol with good reuse performance.This method can construct multiple MOHs with intimate interfacial contact based on the coordination of an organic agent with multiple kinds of metal precursors.Especially,strong coupling Ag/TiO₂ heterostructure have been synthesized through the reasonable optimized preparation process.The Ag/TiO₂ can act as the effective catalyst for the reduction of 4-NP with better activity than the many reported Ag-based catalysts.After recycled use for 10 times,the conversion efficiency have no obvious change.Importantly,the conversion of 4-NP can be largely enhanced under the light irradiation provided by a 150 W xenon lamp.A series of the experiments indicated that the promoted conversion of 4-NP under light irradiation should be ascribed to LSPR effect of Ag that can generate the hot e-and h+ as well as local heating around particles under light irradiation.