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Ternary core-shell composite photocatalyst and preparation method thereof

A catalyst, core-shell type technology, applied in the field of photocatalysis, can solve the problems of poor photochemical corrosion resistance, low utilization rate of sunlight, and intolerance to high-energy photons, etc., to achieve good photocatalytic water splitting hydrogen production performance, good light Effect of Catalytic Degradation of Dye Wastewater

Inactive Publication Date: 2013-07-31
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is that the photocatalysts reported at present have the following disadvantages: the wide bandgap semiconductor catalyst has better corrosion resistance, but can only absorb ultraviolet light that accounts for less than 5% of sunlight. The utilization rate of sunlight is low; the narrow-bandgap semiconductor catalyst can absorb about 40% of visible light in sunlight, but its resistance to photochemical corrosion is poor, especially not resistant to high-energy photon corrosion, and a ternary Core-shell Composite Photocatalyst

Method used

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  • Ternary core-shell composite photocatalyst and preparation method thereof
  • Ternary core-shell composite photocatalyst and preparation method thereof
  • Ternary core-shell composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] TiO 2 / WO 3 -CuAlO 2 Preparation

[0026] (1) Semi-wet synthesis of CuAlO 2 :

[0027] Weigh 5g Cu(NO 3 ) 2 ·3H 2 O, and Al(NO 3 )·9H 2 O, 7.7g, respectively dissolved in deionized water to obtain 20% by mass copper nitrate solution and aluminum nitrate solution, and then add 25% by mass oxalic acid solution to the copper nitrate solution to form copper oxalate precipitation, The molar ratio of oxalic acid to copper is 1.2:1, and the obtained precipitate is filtered and washed and mixed with aluminum nitrate solution, and evaporated to dryness in a water bath at 80° C. under continuous stirring. The evaporated solid is calcined at 1000℃ in nitrogen atmosphere for 6h to prepare CuAlO 2 . After grinding, pass through a 300 mesh sieve for use;

[0028] (2) Synthesis of WO by precipitation loading method 3 -CuAlO 2 :

[0029] Take 2g CuAlO made from (1) 2 , The number of moles is 0.0163mol, weigh 4.13g of ammonium tungstate, and the number of moles of tungsten contained in it is ...

Embodiment 2

[0037] TiO 2 / WO 3 -CuAlO 2 Photocatalytic water splitting performance test

[0038] (1) Use light deposition method on TiO 2 / WO 3 -CuAlO 2 Surface load Pt:

[0039] Will H 2 PtCl 6 Dissolved in anhydrous ethanol solution to prepare a solution with a mass concentration of 1% based on Pt, and then use the TiO prepared in Example 1 2 / WO 3 -CuAlO 2 Put the powder in it, irradiate it with a 250W halogen lamp while magnetically stirring for 0.5h, then filter, and dry at 120°C to obtain a catalyst for photocatalytic water splitting to produce hydrogen;

[0040] Of which Pt and TiO 2 / WO 3 -CuAlO 2 The mass percentage = 0.2%.

[0041] (2) Performance test of catalyst photocatalytic decomposition of water to produce hydrogen.

[0042] Take 0.5g of the above Pt-loaded TiO 2 / WO 3 -CuAlO 2 Photocatalyst, placed in a 1000mL quartz glass reactor, add 800mL deionized water and 0.5g anhydrous Na 2 CO 3 (Make the solution pH=11). Then the reactor is connected to a closed system, and it undergoes th...

Embodiment 3

[0048] TiO 2 / WO 3 -CuAlO 2 Performance Test of Photocatalytic Degradation of Acid Red B

[0049] Take the TiO prepared in Example 1 2 / WO 3 -CuAlO 2 0.1g of catalyst, placed in an 800mL beaker, add 600mL of acid red B solution with a concentration of 10mg / L, magnetically stir for 0.5h in the dark state, take samples, and measure the concentration of acid red B with a spectrophotometer as the undegraded acidity The concentration of red B, after irradiating with a 300W xenon lamp for 1h, the concentration of acid red B is measured, which is the concentration of acid red B after degradation. The decolorization rate of acid red B is calculated by the following formula.

[0050]

[0051] The result is: TiO 2 / WO 3 -CuAlO 2 Under the action of the catalyst, the decolorization rate of Acid Red B was 95.2% after 1 h.

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Abstract

The invention provides a ternary core-shell composite photocatalyst and preparation method thereof. The photocatalyst comprises outer wide-gap semiconductor oxides and inner n-type and p-type narrow bandgap semiconductor oxides. The ratio of them is as follows: the mass ratio of the outer wide-gap semiconductor oxides and the inner n-type and p-type narrow bandgap semiconductor oxides binary assembly is 0.01-0.9:1, the mol ratio of the outer wide-gap semiconductor oxides and the inner n-type and p-type narrow bandgap semiconductor oxides is 0.2-5.0:1. The photocatalyst is used in photocatalysis decomposition water for hydrogen production reaction or photocatalysis dye waste water degradation reaction. The ternary core-shell composite photocatalyst in the invention can resist photochemicalcorrosion, and has good photocatalysis decomposition water for hydrogen production performance and good photocatalysis dye waste water degradation performance.

Description

Technical field: [0001] The invention belongs to the field of photocatalysis, and includes photocatalytic decomposition of water to produce hydrogen and photocatalytic degradation of dye wastewater. Specifically: the structure design and preparation of a ternary core-shell composite photocatalyst. technical background: [0002] Photocatalytic technology is considered to be one of the most promising ways to use solar energy to solve environmental and energy problems. In the past thirty years, it has received great attention and developed numerous photocatalysts. The developed catalysts can be divided into two categories, one is a catalyst that can only sense ultraviolet light, and the other is a catalyst that can partially sense visible light. Catalysts that can only sense visible light, including semiconductor materials with a narrow band gap, such as CdS, and wide band semiconductor materials, such as TiO 2 , The catalyst system obtained by doping and modifying non-metal eleme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/888B01J23/89B01J23/80B01J23/83C01B3/04A62D3/10
CPCY02E60/364Y02E60/36
Inventor 王桂赟王延吉张广林赵新强
Owner HEBEI UNIV OF TECH
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