Application Of G-C₃N₄ Supported Cu₂O In Catalytic Reduction Of 4-NP By NaBH₄

In this thesis,the melamine-derived bulk g-C₃N₄ was firstly exfoliated by thermal oxidation etching and mixed-acid exfoliation,respectively.Then the exfoliated g-C₃N₄was used to load Cu₂O nanoparticles.Finally,the catalytic performance of Cu₂O/g-C₃N₄was evaluated using the reduction of p-nitrophenol（4-NP）by NaBH₄ as probe reaction,expecting to find an efficient and inexpensive catalyst for the degradation of organic pollutants by optimizing the preparation conditions.This paper is mainly divided into the following three parts:（1）g-C₃N₄-CE and g-C₃N₄-AE were obtained by thermal oxidation etching and mixed-acid exfoliation of bulk g-C₃N₄,respectively.The physicochemical properties of the three g-C₃N₄ were characterized by X-ray powder diffraction（XRD）,transmission electron microscopy（TEM）,fourier transform Infrared（FT-IR）,Brunauer-Emmett-Teller（BET）,aiming to explore whether the bulk g-C₃N₄ was exfoliated successfully.（2）g-C₃N₄-CE,Cu（NO₃）₂·3H₂O,salicylaldehyde,and ethanol-water mixture were used as support,copper source,reducing agent,and solvent,respectively,to prepare Cu₂O/g-C₃N₄-CE using solvothermal method;the synthesis conditions of Cu₂O/g-C₃N₄-CE were optimized via evaluating the catalytic performance of the reduction of p-nitrophenol（4-NP）by NaBH₄;.the catalytic performance for the reduction of 4-NP by NaBH₄ over Cu₂O,Cu₂O/g-C₃N₄-b and Cu₂O/g-C₃N₄-CE were compared,and the results demonstrated that exfoliating the bulk g-C₃N₄ and using it to support Cu₂O can significantly improve the catalytic activity of Cu₂O.（3）g-C₃N₄-AE,Cu（NO₃）₂·3H₂O,salicylaldehyde,and ethanol-water mixture were used as support,copper source,reducing agent,and solvent,respectively,to prepare Cu₂O/g-C₃N₄-AE,and optimization of the synthesis conditions of Cu₂O/g-C₃N₄-AE as well comparative studies of the catalytic performances of pure Cu₂O,Cu₂O/g-C₃N₄-b and Cu₂O/g-C₃N₄-AE were compared.The results demonstrated that exfoliating the bulk g-C₃N₄ to Cu₂O/g-C₃N₄-AE and using it to support Cu₂O can significantly improve the catalytic activity of Cu₂O.