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 resistance to photochemical corrosion, low utilization rate of sunlight, intolerance to high-energy photons, etc. Effect of Catalytic Degradation of Dyestuff Wastewater

CN102188980AInactive Publication Date: 2011-09-21HEBEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2011-09-21
Estimated Expiration
Not applicable · inactive patent

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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.
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Description

Technical field:

[0001] The invention belongs to the field of photocatalysis, including photocatalytic decomposition of water to produce hydrogen and photocatalytic degradation of dye wastewater. Specifically: the structural 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 30 years, it has received great attention from people, and many photocatalysts have been developed. The catalysts that have been developed can be divided into two categories, one is the catalyst that can only respond to ultraviolet light, and the other is the catalyst that can partially respond to visible light. Catalysts that can only respond to visible light, including semiconductors with narrow band gaps, such as CdS, and wide band gap semiconductors, such as TiO 2 , the catalyst system obtained b...

Examples

Embodiment 1

[0025] TiO 2 / WO 3 -CuAlO 2 preparation of

[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, was dissolved in deionized water respectively to obtain a copper nitrate solution and an aluminum nitrate solution with a mass percentage composition of 20%, and then the oxalic acid solution with a mass concentration of 25% was added to the copper nitrate solution to form a copper oxalate precipitation, The molar ratio of oxalic acid to copper is 1.2:1, and the resulting precipitate is filtered, washed, mixed with aluminum nitrate solution, and evaporated to dryness in a water bath at 80°C with continuous stirring. The evaporated solid was calcined at 1000°C for 6h in a nitrogen atmosphere to obtain CuAlO 2 . Pass through a 300-mesh sieve after grinding;

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

[0029] Take 2g of CuAlO prepared by (1) 2, its molar number is 0.0163mol, weighs...

Embodiment 2

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

[0038] (1) Using photodeposition method on TiO 2 / WO 3 -CuAlO 2 Surface load Pt:

[0039] H 2 PtCl 6 Dissolve in dehydrated ethanol solution, make the solution that the mass concentration is 1% in terms of Pt, then the TiO obtained in Example 1 2 / WO 3 -CuAlO 2 Place the powder in it, irradiate it with a 250W halogen tungsten lamp for 0.5h while magnetically stirring, then filter, and dry at 120°C to obtain a catalyst for photocatalytic water splitting to produce hydrogen;

[0040] Among them, Pt and TiO 2 / WO 3 -CuAlO 2 The mass percent of = 0.2%.

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

[0042] Take 0.5g of the above TiO loaded with Pt 2 / WO 3 -CuAlO 2 Photocatalyst, put in 1000mL quartz glass reactor, add 800mL deionized water and 0.5g anhydrous Na 2 CO 3 (Make solution pH = 11). Then connect the reactor into a clos...

Embodiment 3

[0048] TiO 2 / WO 3 -CuAlO 2 Performance test of photocatalytic degradation of acid red B

[0049] Get the TiO that embodiment 1 makes 2 / WO 3 -CuAlO 2 Catalyst 0.1g, put in 800mL beaker, add 600mL acid red B solution with a concentration of 10mg / L, stir magnetically for 0.5h in a dark state, take a sample, measure the concentration of acid red B with a spectrophotometer, and use it as the acid red B solution when it is not degraded. For the concentration of red B, after irradiating with a 300W xenon lamp for 1 hour, measure the concentration of acid red B, which is the concentration of acid red B after degradation, and use the following formula to calculate the decolorization rate of acid red B.

[0050]

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