| With the rapid development of the times,environmental pollution has attracted more and more attention.Coal,oil,natural gas and other fossil energy are the main energy needed by the society,but their using causes serious environmental pollution,and the dye wastewater produced for the production of daily necessities also causes serious pollution to water resources.With the popularization of sustainable development concept,people pay more and more attention to green energy.Solar energy is inexhaustible and clean,while semiconductor photocatalytic technology is a kind of green environmental protection technology,which is based on the direct driving force of sunlight.Therefore,it is very important to design and explore high performance and low-cost photocatalytic materials.In this paper,Sn O2nanomaterial is taken as the research object,and the hydrothermal synthesis method with simple controllable and environmentally friendly synthetic products is taken as the main preparation method.The influence of composite semiconductor materials on photocatalytic performance is systematically studied,the relevant mechanism is explored,and the electrochemical performance of composite materials is tested.The main contents are as follows:Hollow hexagonal prism Sn O2 samples were successfully prepared by a simple one-step hydrothermal method.The photocatalytic performance of the prepared powder was tested for Eosin,Methylene blue and Congo red,and the degradation rates were eosin（96%）>Methylene blue（92%）>Congo red（56%）.Eosin dye was selected to compare the photocatalytic performance of the prepared sample with flower Sn O2 and commercial Sn O2 powders on the basis of 25 min,as well as the cyclic stability test.It can be concluded that the prepared hollow hexagonal prism Sn O2 has good photocatalytic performance;In order to make up for the wide gap of Sn O2,the photocatalytic modification of Fe2O3nano-material with narrow band gap and Sn O2 was studied.The photocatalytic properties of single Sn O2 and Sn O2@Fe2O3 were tested respectively.The photocatalytic degradation of the single Sn O2 nanomaterial was carried out,and the degradation rates of eosin（93%）>Congo red（91%）>Methylene blue（83%）for the three dyes were based on 30 min.Compared with the photocatalytic performance of Sn O2@Fe2O3 nanocomposites,the degradation rate of eosin dye was as high as 99%after 15 min of catalytic degradation,so that the composite Fe2O3significantly improved the photocatalytic performance of the material.As a electrode material,Sn O2@Fe2O3 nano-heterostructure showed higher capacity and longer charge and discharge time.The prepared Sn O2@Fe2O3 composite exhibited a specific capacity of 76 m F/cm2（2 m A/cm2）;In order to further improve the photocatalytic performance of the material,high activity Ni element was added into the Sn based material.Firstly,Ni-Sn S2 was prepared by hydrothermal method.The Ni-Sn O2 material was grown in situ on the surface of Ni-Sn S2 by calcination in muffle furnace.By controlling the calcination time,Ni-Sn S2/Sn O2 composites of different degrees were obtained.The photocatalytic properties of the prepared Sn S2,Ni-Sn S2 and the samples calcined for 50 min,100 min,200 min and 400 min were tested.Eosin dye of 10 mg/L was prepared with degradation time of 30 min as reference.When the calcination time is 100min,the photocatalytic performance of the prepared Ni-Sn S2/Sn O2 sample was obviously higher than other samples,reaching 98%.After that,the electrochemical properties of the calcined samples for 100 min were tested.The material showed a specific capacity of 60.8m F/cm2（1m A/cm2）and retained more than 90%of the initial capacity after 10000 charges and discharges. |
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