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s-tio2/srnb2o6 composite photocatalyst and preparation method and application

A technology of catalyst and composite light, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems that composite photocatalysts have no visible light activity, narrow band gap width, etc., and solve the problem of energy band gap Phase matching and narrow spectral response range, improved quantum efficiency, and enhanced catalytic activity

Inactive Publication Date: 2011-11-30
YANTAI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the anatase TiO 2 The bandgap is still wide (about 3.2eV), and can only be controlled by λ g Excited by ultraviolet light with a wavelength of ≤387nm, so the composite photocatalyst made by coupling still has no visible light activity; in addition, TiO 2 The energy band energy level of the composite photocatalyst does not match with many wide bandgap dielectric materials, and the energy band synergy effect of the composite photocatalyst cannot be produced after coupling. In order to solve these problems, the present invention first 2 Doped with S to synthesize S-TiO 2 , the incorporation of S not only shrinks the TiO 2 The bandgap width of TiO is modulated 2 energy level position

Method used

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  • s-tio2/srnb2o6 composite photocatalyst and preparation method and application
  • s-tio2/srnb2o6 composite photocatalyst and preparation method and application
  • s-tio2/srnb2o6 composite photocatalyst and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Preparation of 20g S-TiO 2 The doping amount of S in the middle is 18wt%, S-TiO 2 / SrNb 2 o 6 Medium S-TiO 2 2.0Wt% S-TiO 2 / SrNb 2 o 6 composite photocatalyst. Its preparation method is: under continuous stirring, drop the mixture of 0.85mL deionized water, 0.34mL of 65%-68% nitric acid and 3.35mL of absolute ethanol into the mixture of 1.7044g of tetrabutyl titanate and 5.2mL of absolute ethanol solution, then dissolved in 0.17g thiourea, reacted for 2 hours, added 19.6gSrNb 2 o 6 Powder (SrNb 2 o 6 For the preparation, see 2) in Example 1. After drying in a water bath at 70°C, put it into a muffle furnace and bake at 450°C for 3 hours, and cool to room temperature for storage.

[0017] 2. Prepared SrNb 2 o 6 . The preparation method refers to the literature (Tao Huang, Xinping Lin, Jingcheng Xing "Photocatalytic activities of hetero-junction semiconductors WO 3 / SrNb 2 o 6 ""Materials Science and Engineering: B" 2007, 141(25): 49~54), and SrCO 3 ...

Embodiment 2

[0033] 1. Preparation of 20g S-TiO 2 The doping amount of S in the middle is 18wt%, S-TiO 2 / SrNb 2 o 6 Medium S-TiO 2 3.0Wt% S-TiO 2 / SrNb 2 o 6 composite photocatalyst. Its preparation method is: under continuous stirring, drop the mixture of 1.25mL of deionized water, 0.5mL of 65%-68% nitric acid and 5.0mL of absolute ethanol into the mixture of 2.5566g of tetrabutyl titanate and 7.8mL of absolute ethanol solution, then dissolved in 0.26g thiourea, reacted for 2 hours, added 19.4gSrNb 2 o 6 Powder (SrNb 2 o 6 For the preparation, see 2) in Example 1. After drying in a water bath at 70°C, put it into a muffle furnace and bake at 450°C for 3 hours, and cool to room temperature for storage.

[0034] 2. Prepared SrNb 2 o 6 . The preparation method is the same as 2 in Example 1.

[0035] 3. The performance evaluation of the photocatalyst is the same as 5 in Example 1.

[0036] Under ultraviolet light irradiation, 20g3.0Wt%S-TiO 2 / SrNb 2 o 6 The degradation ra...

Embodiment 3

[0042] 1. Preparation of 20g S-TiO 2 The doping amount of S in the middle is 18wt%, S-TiO 2 / SrNb 2 o 6 Medium S-TiO 2 4.0Wt% S-TiO 2 / SrNb 2 o 6 composite photocatalyst. Its preparation method is: under continuous stirring, drop the mixture of 1.7mL deionized water, 0.68mL of 65%-68% nitric acid and 6.7mL of absolute ethanol into the mixture of 3.4088g of tetrabutyl titanate and 10.4mL of absolute ethanol solution, then dissolved in 0.34g thiourea, reacted for 2 hours, added 19.2gSrNb 2 o 6 Powder (SrNb 2 o 6 For the preparation, see 2) in Example 1. After drying in a water bath at 70°C, put it into a muffle furnace and bake at 450°C for 3 hours, and cool to room temperature for storage.

[0043] 2. Prepared SrNb 2 o 6 . The preparation method is the same as 2 in Example 1.

[0044] 3. The performance evaluation of the photocatalyst is the same as 5 in Example 1.

[0045] Under ultraviolet light irradiation, 20g4.0Wt%S-TiO 2 / SrNb 2 o 6 The degradation rate...

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Abstract

The invention discloses an S-doped TiO2 composite photocatalyst S-TiO2 / SrNb2O6 belonging to the catalyst category, and is used for catalytic conversion of gas-phase organic pollutants. Compared with SrNb2O6, the composite photocatalyst not only extends the spectral response range to the visible light region, but also greatly improves the quantum efficiency and catalytic activity. This is because after TiO2 is doped with S, it not only narrows the band gap, but also has the ability to respond to visible light; it also modulates the energy level position and couples with SrNb2O6, and the energy levels of the two match, so that the photogenerated carriers can be effectively separated, and the quantum efficiency, catalytic Activity has been greatly improved.

Description

Technical field: [0001] The invention belongs to the category of catalysts, in particular to a kind of S-TiO 2 / SrNb 2 o 6 Preparation of composite photocatalyst and its application in photocatalysis. Background technique: [0002] Since 1972 Fujishima and Honda found in TiO 2 Since electrode photocatalytic hydrogen evolution (Fujishima A, Honda K "E1electrochemical photocatalysis of water at a semiconductor electrode" "Nature" 1972, 238: 37-38), people have studied almost all semiconductor materials, trying to prepare excellent performance efficient photocatalyst. Although many important results have been obtained, there is still a gap from the requirements of practical application. In recent years, many researchers have turned their attention to wide bandgap dielectric materials. In 2006, Sun Chao and others prepared a photocatalyst with a band gap of 4.6eV Na 2 Ta 2 o 6 (Sun Chao, Huang Langhuan, Liu Yingliang "Na 2 Ta 2 o 6 Preparation and performance researc...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J23/20B01D53/86B01D53/72
Inventor 李硕
Owner YANTAI UNIV
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