The Construction Of Tin Dioxide-based Catalyst And Its Kinetic Process

With the accelerated process of industrialization and urbanization,a large number of toxic pollutants,have been discharged to the living environment.These pollutants bring great challenges to the living environment of the earth life.At the same time,the process of industrialization and urbanization also consumes a large number of fossil energy which is short of day and night.Therefore,environmental and energy problems are two serious problems to be solved in the twenty-first Century sustainable development strategy.Using traditional methods to solve environmental problems,we need to consume extra non clean energy,and it is also very difficult to completely degrade them.Therefore,developing a simple,efficient,harmless and clean way to solve environmental problems is an urgent task in the current society.As a new technology developed in recent decades,photocatalytic technology can not only solve energy and environmental problems but also consume solar energy,and do not consume other energy.It is considered to be one of the effective methods to solve the two difficult problems of environment and energy.As an important photocatalytic material,SnO2 has excellent physical and chemical properties.In this paper,the heterostructural photocatalysis based on SnO2 nanostructures were studied and their kinetic process were further studied.The main work of this paper is as follows:1.We prepared the SnO2-Cu2O heterostructure by hydrothermal method using NaOH?SnGl4·5H20?CuSO4·5H2O?C6H12O6 as precursor.The samples were found to be nanoparticles with large specific surface area,SnO2-Cu2O formed a tight heterostructure.The existence of the heterostructure not only realizes the effective optical absorption under visible light,but also realizes the effective separation of the optical carrier,thus improving the catalytic performance under the visible light irradiation.Finally,we also studied the kinetic process in the SnO2-Cu2O catalysis process in detail.2.Using PbS as a visible light absorption material,the SnO2-PbS composites photocatalyst were prepared by hydrothermal method.The structure and morphology of different SnO2-PbS ratios were studied by means of XRD,TEM and Raman.By comparing the catalytic properties of the samples at different proportions,it was found that the catalytic performance was the best when the ratio was 1:2.By the analysis of the photoinduced carrier transfer process,we think that the effective expansion of visible light absorption,the effective separation of photogenerated carriers and the effective suppression of the photoinduced carrier recombination are the fundamental reasons for the improved photocatalytic performance.3.Porous anodic tin oxides were constructed via anodic oxidation of tin foils.The pore size and morphology of porous nanostructures were controlled by controlling different reaction voltages,and the photocatalytic properties of samples prepared under different reaction voltages were studied.The heterostructure of Au-SnO2 was constructed,and it was found that the introduction of Au greatly improved the catalytic performance of the porous SnO2.The introduction of Au resylting the improved light absorption of SnO2 is believed to be the fundamental reason for the enhancement of the photocatalytic performance.