The Preparation Of Copper-based Chalcogen Compound And The Performance Of Photocatalytic Organic Synthesis Reaction

Over the past few years,organic synthesis has made great contributions to human life.Organic reactions are mainly based on the use of noble metal catalysts and need heat drive.They have the disadvantages of high cost,high energy consumption and serious pollution.To achieve high photocatalytic organic synthesis efficiency,it is necessary to effectively separate and transfer electrons and holes in semiconductors.It is an ideal and promising way to use photothermal effect instead of external heat to stimulate narrow bandgap metal oxides by visible and near infrared light to drive catalytic reaction.Photothermal effect can produce instantaneous high temperature on the surface of catalyst,overcome the activation energy in chemical reaction,improve the photocatalytic activity of photocatalyst,and realize photothermal synergistic catalytic organic synthesis reaction,which has a good application prospect.The new Cu_xS_y composite has higher photothermal effect and photoinduced charge separation rate,which provides a great obstacle to the practical application of photocatalytic organic reaction.The main contents of this paper are as follows:?1?Using symmetrically smooth Cu₂O cubes as sacrificial templates,Cu₇S₄,Cu₉S₈and Cu₉S₈ hollow cubes with strong plasma absorption in near infrared region can be synthesized controllably.The type of sulfur source and reaction time were studied.The photocatalytic oxidation of benzylamine over Au-Pt/Cu₇S₄-Cu₉S₈ catalyst was studied.The photocatalytic oxidation mechanism of benzylamine over Au-Pt/Cu₇S₄-Cu₉S₈catalyst was studied.?2?CuS nanoflowers were synthesized by hydrothermal method using copper acetate as copper source and sulfur powder as sulfur source.MoS₂/CuS was obtained by further hydrothermal treatment of CuS samples.A series of MoS₂/CuS catalysts with different loads were prepared by adjusting the amount of MoS₂.MoS₂/CuS with graded structure was characterized by a series of methods.The photocatalytic reduction of nitrobenzene under visible light was tested.The mechanism of photocatalytic reduction of nitrobenzene was fully studied.?3?CuS/CNFs hierarchical structure was formed by coating CuS nanosheets on CNFs by solvothermal method with carbon nanofibers as the substrate,copper acetate and thiourea as additives.The effects of different CuS loadings on photocatalytic performance were discussed.The CuS-CdS/CNFs graded structure photocatalyst was obtained by cationic exchange of part of CuS to CdS after hydrothermal treatment.The catalysts were characterized and the photocatalytic oxidation of benzylamine under visible light irradiation was studied.