Synthesis And Photocatalytic Properties Of ZnO-based Composites Materials

This article is mainly based on ZnO photocatalytic material,which is then combined with other semiconductors,metals or carbon materials to form composite materials.By introducing different types of materials to improve the performance of ZnO and increase the application of ZnO.In the first chapter,first,the research significance of semiconductor photocatalysis technology is introduced,secondly,the application of semiconductor photocatalysis is discussed in detail,third,the basic properties and shortcomings of ZnO are summarized,finally,a method of using ZnO as the matrix to compound with other materials to form various heterojunctions to enhance photocatalytic performance is proposed.In the second chapter,ZnO@ZnS heterojunction was prepared.The flowers composed of ZnO nanorods were synthesized by a one-step hydrothermal method.On this basis,On this basis,the ZnO@ZnS core-shell structure was prepared by solution recrystallization.A further increase in thiourea leads to the formation of a ZnS hollow structure,which is due to the Kirkendall effect.The formation mechanism of ZnO@ZnS heterojunction was introduced in detail,and the crystal morphology and photoelectrochemical performance of ZnO@ZnS with different proportions were studied.In the third chapter,Cu@Cu₂O@ZnO heterojunction was prepared.First,ZnO nanoparticles were synthesized,and then Cu@Cu₂O@ZnO heterojunction was synthesized by photodeposition method.The structure of Z-scheme heterojunction accelerates the degradation rate of pollutants.Among them,metal copper nanoparticles play an irreplaceable role in photocatalytic degradation.On the one hand,it acts as an electron-hole recombination center and promotes the transfer of photogenerated carriers.On the other hand,it has the effect of plasmon resonance,thereby improving the range of light response.In the fourth chapter,first,ZnO,ZnO/RGO,g-C₃N₄ materials were prepared,and then a ternary heterojunction was obtained by high-temperature calcination.The g-C₃N₄material has a small band gap,so the utilization rate of sunlight is high,and the reduction potential is relatively high.In addition,the introduction of RGO enables the gradual transfer of electrons in the ZnO/g-C₃N₄ composite material.Therefore,the ZnO/RGO/g-C₃N₄ heterojunction has stronger photocatalytic activity and stability.In the fifth chapter,a summary of the above experimental work.It mainly includes the innovations of each work and the ideas for more in-depth exploration of it.In this paper,the ZnO@ZnS heterojunction was successfully synthesized.The construction of the heterojunction improved the activity of photocatalytic hydrogen production and inhibited the photocorrosion effect of ZnO;The Cu@Cu₂O@ZnO heterojunction was obtained by the photodeposition method,and the construction of the Z-scheme mechanism improved the separation of photogenerated carriers and increased the photocatalytic performance;The preparation of the ternary ZnO/RGO/g-C₃N₄heterojunction broadens the photoresponse range of ZnO,promotes the transfer of photogenerated electrons,and exhibits excellent degradation performance under visible light.