Visible light response composite photocatalyst and preparation method thereof

A catalyst and composite light technology, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low hydrogen production rate, difficulty in utilizing visible light, increase in hydrogen production rate, and decrease in photocatalytic efficiency. And other issues

Inactive Publication Date: 2010-01-13
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At the present stage, visible light semiconductor photocatalysts are mainly divided into: (1) Doped semiconductor photocatalysts (including noble metal deposition, oxide recombination and multi-component doping), these researches are difficult to obtain in terms of visible light utilization and hydrogen production rate at the same time. improve
(2) Perovskite-type oxide photocatalysts. Among the catalysts studied at present, the hydrogen production rate is generally low
(3) Layered semiconductor oxide photocatalysts will inevitably reduce the specific surface area of ​​the catalyst due to interlayer recombination, which will reduce the photocatalytic efficiency
(4) Molecular sieve photocatalyst, no molecular sieve photocatalyst with application value has been found yet
They can photocatalyze gas production under certain conditions, but most of these photocatalysts only respond in the range of ultraviolet light, and ultraviolet light only accounts for 4% of the total energy of sunlight, or the efficiency of photocatalytic hydrogen production is too low to be applied. value

Method used

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  • Visible light response composite photocatalyst and preparation method thereof
  • Visible light response composite photocatalyst and preparation method thereof
  • Visible light response composite photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] to 0.2mol·L -1 Slowly add 0.1mol L to the sodium oxalate solution -1 Zirconium oxychloride, and keep stirring, get clear Na 2 ZrO(C 2 o 4 ) 2 solution. At room temperature, an equal amount of Sr(NO 3 ) 2 solution with freshly prepared Na 2 ZrO(C2 o 4 ) 2 The solutions are mixed to obtain white SrZrO(C 2 o 4 ) 2 Precipitation, SrZrO(C 2 o 4 ) 2 After precipitation filtration, successively use hot water, 10wt% ZrOCl 2 The solution was washed with distilled water and acetone, and then dried at 70° C., and the dried product was calcined at 900° C. for 5 hours to obtain strontium zirconate. Take 0.007 mole of yttrium oxide powder and 0.10 mole of strontium zirconate powder and grind them thoroughly in an agate mortar, mix them evenly, press into tablets, and calcinate at 1250°C for 1 hour (repeated three times), to obtain a photocatalyst with yttrium doping amount of 7%. Get 10 grams of yttrium-doped strontium zirconate and 90 grams of TiO 2 Mix and grind t...

Embodiment 2

[0021] The method of Example 1 was adopted to obtain strontium zirconate. Take 0.005 mole of yttrium oxide powder and 0.10 mole of strontium zirconate and grind them thoroughly in an agate mortar, mix them evenly, press them into tablets, and calcinate at 1250°C for 1 hour (repeated three times), to obtain a product with 5% yttrium-doped strontium zirconate . Get 20 grams of 5% yttrium-doped strontium zirconate and 80 grams of TiO 2 Mix and grind thoroughly, then sinter at 700°C for 1 hour, take out the product and lightly grind it, and the product is marked as SZYT-80, which is used as the catalyst substrate before platinum loading. 10 grams of SZYT-70 were dispersed in 50 mL of methanol solution containing 0.040 grams of chloroplatinic acid (V H2O :V MeOH =99:1) for 15 minutes of ultrasonication, continued stirring for 30 minutes, and then directly irradiated with a 250W high-pressure mercury lamp for 10 hours under a nitrogen atmosphere. The photoreduction reaction of c...

Embodiment 3

[0023] The method of Example 1 was adopted to obtain strontium zirconate. Take 0.005 mol of yttrium oxide powder and 0.10 mol of strontium zirconate in an agate mortar, grind them well, mix them evenly, press into tablets, and calcinate at 1250°C for 1 hour (repeated three times), to obtain a photocatalyst with 5% yttrium doping. Get 30 grams of yttrium-doped strontium zirconate and 70 grams of TiO 2 Mix and grind thoroughly, then sinter at 700°C for 1 hour, take out the product and lightly grind it, and the product is marked as SZYT-70, which is used as the catalyst substrate before platinum loading. 10 grams of SZYT-70 were dispersed in 50 mL of methanol solution containing 0.090 grams of chloroplatinic acid (V H2O :V MeOH =99:1) for 15 minutes of ultrasonication, continued stirring for 30 minutes, and then directly irradiated with a 250W high-pressure mercury lamp for 10 hours under a nitrogen atmosphere. The photoreduction reaction of chloroplatinic acid occurs, and hig...

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Abstract

The invention relates to a method for preparing platinum-supported and yttrium-doped strontium zirconate-titanium dioxide composite photocatalyst, comprising: (1) adding sodium oxalate solution into zirconium oxychloride, and obtaining Na2 ZrO (C2O4)2 solution; mixing Sr(NO3)2 solution and the Na2 ZrO (C2O4)2 solution, obtaining white precipitate, filtering, washing, drying and calcining the precipitate, and obtaining the strontium zirconate; (2) fully grinding yttrium oxide and the strontium zirconate, tabletting and calcining to obtain yttrium-doped strontium zirconate; (3) mixing the yttrium-doped strontium zirconate and TiO2, and sintering to obtain composite catalyst; (4) dispersing the product in methanol solution containing chloroplatinic acid to be processed by ultrasound and agitation and directly irradiated by a high-pressure mercury lamp under the nitrogen atmosphere; filtering, washing and calcining the product, and obtaining the finished product; the catalyst has good hydrogen production activity under visible light. The photocatalyst has good application prospect in the aspect of hydrogen production of visible light catalytic material, simple technique, convenient operation, lower cost and long service life.

Description

technical field [0001] The invention relates to a method for preparing a composite photocatalytic material that responds under visible light. The photocatalytic material is formed by compounding yttrium-doped strontium zirconate and titanium dioxide and depositing metal platinum on its surface. It has better performance under visible light. Photocatalytic hydrogen production activity. Background technique [0002] As a new energy source, hydrogen is one of the hottest topics in the fields of energy and environment. One of the main reasons is that fossil energy such as coal and oil on the earth will face the danger of depletion, and hydrogen energy may become one of the best alternative energy sources; secondly, the combustion of fossil energy is the main source of environmental pollution. Studies have shown that 90% of the earth's greenhouse effect is caused by human burning of fossil sources; in addition, hydrogen is a non-polluting, renewable new energy source. Hydrogen ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/58B01J21/06C01G25/00B01J37/04B01J37/08B01J37/16B01J37/03C01B3/04
CPCY02E60/364Y02E60/36
Inventor 阎建辉张丽易健民唐课文侯朝辉郑淑琴潘阳刘强
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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