The Effect Of Micro Control On The Photocatalytic Properties Of SnO₂ Nanostructures

With the development of industry,the pollution of organic wastewater is becoming more and more serious.A large number of studies show that semiconductor nanomaterials can catalyze the degradation of organic components in sewage by light irradiation,which can be decomposed into CO₂ and H₂O.Among them,SnO₂ as a n semiconductor nanomaterials has been widely studied in the field of photocatalysis,and has good performance and application prospects.In this paper,three kinds of SnO₂ nanomaterials with different microstructure were prepared by hydrothermal method and solution reduction method.The photocatalytic properties of the SnO₂ nanostructures were optimized by adjusting the experimental parameters,and the reasons for the difference of photocatalytic properties of different microstructures were studied.1.Using the hydrothermal method,SnCl₄·5H₂O as the tin source,a series of one-dimensional SnO₂ nano materials were prepared.It is found that with the decrease of the amount of absolute ethanol in the solvent,the cone-shaped SnO₂ nanostructure gradually becomes a rod like SnO₂ nanostructure with higher photocatalytic activity.2.The self assembled nano-SnO₂ flower was prepared by hydrothermal method using SnCl₂·2H₂O as tin source.In this paper,the effects of NaOH and sodium citrate’s addition on the flower structure were investigated,and the microstructure of flower SnO₂was regulated by adding surfactants.When the amount of cetyltrimethyl ammonium bromide（CTAB）is 0.2g,the morphology of SnO₂ flower is the best and the photocatalytic performance is the best.3.Using SnCl₄·5H₂O as tin source,NaBH₄ as reducing agent and H₂PtCl₆·6H₂O as catalyst,SnO₂ hollow hexahedron was successfully prepared by solution reduction method.The influence of the amount of H₂PtCl₆·6H₂O on the structure size of SnO₂ nano hexahedron was studied.The SnO₂ hollow hexahedron with different sizes was prepared,and the forming mechanism of SnO₂ hollow hexahedron was put forward.4.The SnO₂ samples with rod like,flower and hollow hexahedron structures were used as photocatalysts to degrade methyl orange（MO）under UV light,and the effects of different SnO₂ nanostructures on the photocatalytic properties were studied.It is found that hollow hexahedral structure has the best photocatalytic performance.Meanwhile,the mechanism of photocatalytic degradation of MO by SnO₂ was also analyzed.