Preparation method for stannous methyl amino iodide-titanium dioxide visible light catalytic material

Abstract

The invention discloses a preparation method for a stannous methyl amino iodide-titanium dioxide visible light catalytic material. The preparation method comprises the following steps: 1) preparing ammonium methyl iodide; 2) preparing stannous iodide; 3) preparing stannous methyl amino iodide; 4) preparing the stannous methyl amino iodide-titanium dioxide visible light catalytic material: adding stannous methyl amino iodide and tetrabutyl titanate into normal hexane, mixing, heating and stirring at 70 DEG C for reaction under reflux, centrifugally separating turbid liquid by using a high speed centrifuge, adding into deionized water after centrifugal separation, magnetically stirring, filtering, washing and drying to obtain dry solid powder, and putting into a muffle furnace for roasting, thereby acquiring the methyl amino stannous iodide-titanium dioxide visible light catalytic material. The preparation method is simple and convenient in operation and low in cost; the photoproduction electron generated by the visible light catalytic material can quickly transfer to a TiO2 guide tape; the recombination rate of photoproduction electron and hole can be reduced; the separation of the photoproduction electron-hole on the material interface can be promoted; the visible light catalytic activity of the material is promoted.

Description

technical field [0001] The invention relates to the technical field of visible light catalytic materials, in particular to a method for preparing a methylamino tin iodide-titanium dioxide visible light catalytic material. Background technique [0002] Photocatalytic material is a potential and ideal environmental purification material, titanium dioxide (TiO 2 ) has become a versatile material for photocatalytic applications due to its unique properties. However, since titanium dioxide (TiO 2 ) has too large a bandgap width, and can only absorb ultraviolet light with a wavelength less than 387nm, and ultraviolet light only accounts for about 4% of the total energy of sunlight, thus greatly limiting its application in actual production and life. [0003] In recent years, the emergence of organic-inorganic hybrid perovskite-based materials as light absorber hole transport layer materials has made optoelectronic technology have a new development direction. Methylamino tin iod...

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Problems solved by technology

However, since methylaminotin iodide (MASnI 3 ) small bandgap width, so that the photogenerated electrons and holes rapidly recombine, although the photoresponse range is widened, but its catalytic efficiency is not high

[0004] Currently, methylamino tin iodide (MASnI 3 ) The commonly used methods for material preparation are: normal temperature grinding method (see literature: ChungI., SongJ.-H., ImJ., et al. J.Am.Chem.Soc. 2012,134,8579.); high temperature mixing method (SchaeferF.C., HechenbleiknerI., etal. J.Am.Chem.Soc. 1959,81,1466.); liquid phase spin coating method (NamJJ., JunHN., YoungCK., etal. NatureMaterials. 2014,13,897.), among them, the materials synthesized by grinding and mixing methods have low purity, often contain impurities, and the stoichiometric ratio of components is not accurate, so that certain defects will appear in the materials

The material synthesized by the liquid phase spin coating method improves the purity of the material, but the uniformity of the coating layer is not well controlled during the spin coating process, which affects the performance of the material

Moreover, the above methods all need vacuum operation, which increases the cost of synthetic materials and makes the operation more complicated.

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