Synthesis And Characterization Of Photocatalysts Based On Zeolitic Imidazole Frameworks And Non-metal Doping

The increasingly decrease of energy and environmental pollution have become two urgent problems in the world today.Photocatalytic technology is considered to be the promising strategy for solving the energy and environmental problems because it can be used for photodegradation and photocatalytic hydrogen production.However,conventional single semiconductor photocatalysts such as ZnO and TiO₂have the disadvantages that the band energy is so wide that can only absorb ultraviolet light.,and the recombination rate of photo-generated carrier is too fast,which greatly limits its application.In this work,several new composite semiconductor catalysts were prepared by using zeolitic imidazole framework materials as precursors or non-metal doping with functional raw materials to optimize the photocatalysts visible light response ability and promote the separation of photoinduced electron-hole pairs.1.Using ZIF-8 as precursor and ammonium acetate as N source,a series of C N co-doped ZnO was prepared via solid phase pyrolysis method,and different mass fractions of Au were loaded using photochemical reduction method.The degradation of Rhodamine B was carried out and it was found that the sample of the mass ratio of ammonium acetate to ZIF-8 was 1.25,and the mass fraction of Au was 1%processed the optimal photocatalytic efficiency2.Using ZIF-8 as precursor,C doped ZnO was firstly obtained by solid phase pyrolysis of ZIF-8,the C-ZnS/ZnMoO₄@MoS₂ and C-ZnS/MoS₂ were then prepared by a one-pot method.The photocatalytic degradation of tetracycline hydrochloride and Rhodamine B were carried out.The results demonstrated that the ZM2 sample of C-ZnS/ZnMoO₄@MoS₂ showed the best photocatalytic performance.3.A series of P doped mesopores g-C₃N₄ was prepared via co-polymerization method using melamine phosphate polymer and melamine.The hydrogen production experiment of photocatalysts loaded with 3%Pt was carried out.It was found that the P-CN 1 showed the highest hydrogen generation activity of 166.95?mol/g/h.The effect of the loading amount of Pt on the performance of catalyst P-CN 1 had also been investigated and found that there was no hydrogen generated when the Pt reduced to only 0.3%.4.This work selected the sample P-CN 1 in the previous chapter and CuS to construct the 0D/2D heterojunction to enhance the photocatalytic activity of P-CN1.The hydrogen production experiment of photocatalysts loaded with 0.3%Pt was carried out,the photocatalytic performance was the highest when the mass fraction of CuS was 0.7%,and the hydrogen production could be achieved 505.56?mol/g within3 hours.