Preparation Of Iron-based Cocatalyst By Photoreduction And Their Dyes-sensitized Photocatalytic Hydrogen Production

Photocatalytic hydrogen evolution has received extensive attention due to its great potential on solving the energy crisis and environmental pollution problems.However,it is very difficult to establish stable,highly efficient and inexpensive photocatalytic systems for H₂production from water splitting.Dye-sensitization is an effective method to improve the absorption properties of visible light.Iron can be used as a co-catalyst.Iron is low in cost and rich in the earth's crust.However,Elemental Iron itself shows low activity for hydrogen production.Therefore,the photocatalytic activity of iron can be improved by modification.In this thesis,the modified Fe?0?particles were prepared by the photo-reduction method with the Eosin Y as the sensitizer.Then,the photocatalytic hydrogen production performance of the modified Fe?0?particles was studied.The dissertation consists of the following two parts:?1?Fe?0?-melamine composites were synthesized through in situ photoreduction of Fe?II?-melamine complex at room temperature.The Fe?0?-melamine composite displays core-shell nanocubes,which shows superior photocatalytic H₂evolution performance and good stability.The hydrogen production rate of Fe?0?-melamine is80.5?molh^-1,which is far greater than the hydrogen evolution activity of Eosin Y sensitized nano Fe?0?under the same conditions.The maximal apparent quantum yield?AQY?of EY-Fe?0?-melamine system for hydrogen evolution rises up to 16.6%under monochromaticlight irradiation at 470 nm.?2?Supported Fe?0?/g-C₃N₄catalyst was prepared by simple photoreduction method.Under the optimum conditions(p H=10,3×10^-4mol/L EY),the hydrogen evolution rate was 101.7?mol h^-1,it was 9.2 times of that of nano Fe?0?.At 470 nm,there is a maximum apparent quantum efficiency?AQY?of 18.7%.