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Composite photocatalyst prepared from stephanoporate mineral and method thereof

A technology of porous minerals and photocatalysts, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of no thermal activation or chemical activation, reduce the risk of poisoning, mild conditions, and facilitate batches The effect of production

Inactive Publication Date: 2008-12-17
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing carriers are simply purified without thermal or chemical activation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] - Preparation of carrier

[0034] a. Activation treatment of porous minerals

[0035] Crush the natural porous minerals to 2 SO 4 or HCl, HNO 3 , or 0.5%-5% NaOH, activate at 20°C-100°C for 2h, filter and wash until the filtrate is neutral, and dry at 150°C for 6h to obtain a porous carrier.

[0036] b. Porous treatment of layered minerals

[0037] Crush the natural layered minerals to 2 SO 4 , adjusted to pH = 9-11, hydrothermal reaction at 80°C for 2-6 days, filtered and washed until the filtrate was free of Cl - , dried at 120°C for 4h, and calcined at 500-800°C for 8h to obtain the carrier. In the carrier, natural layered minerals account for 40%-90% of the total mass, and the final component of the pore-forming agent accounts for 10%-60% of the total mass.

[0038] - Preparation of photocatalyst

[0039] Use the sol-gel method to prepare a variety of n-type semiconductor precursor sols, and then mix one or more semiconductor sols in a certain proportion, sti...

Embodiment 1

[0052] The natural zeolite produced in Jilin Panshi was crushed and sieved to obtain a 100-mesh powder, which was roasted at 400°C for 1 hour to obtain an activated zeolite carrier. 5mLTiC 14 Drop into 80mL absolute ethanol, add 0.006g FeC 13 ·6H 2O Stir for 2h to form a homogeneous sol. Take 5mL of sol and add 5g of carrier, stir to form a uniform mixture, dry it at 120°C for 12h, and roast it at 300°C for 1h to make Fe 2 o 3 -TiO 2 / Zeolite photocatalyst. Take 0.125g of this photocatalyst in 20mL of methyl orange (a kind of azo dye) solution with a concentration of 20mg / L, and irradiate it with sunlight for 2h. The decolorization rate of methyl orange exceeds 80%, and the repeated use performance is also very good it is good.

Embodiment 2

[0054] Natural calcium-based bentonite produced in Jilin was crushed to 100 mesh and dried at 120°C for 4 hours. Weigh 5 grams of bentonite, add 50 mL of water and stir for 0.5 h, adjust the pH of the slurry to 2 with 1 mol / L HCl, add 4 mL of TiC at room temperature 14, keep stirring, raise the temperature to 85°C and keep it warm for 30min, then drop in 1mol / L NaOH solution to adjust the pH=7, the formed flocs are filtered and washed several times until there is no free Cl in the filtrate - (detected by AgNO3), then dried at 120°C for 4 hours, and then roasted at 200°C for 2 hours to obtain TiO 2 / bentonite photocatalyst. Put 0.5g catalyst into 50mL 7mg / L rhodamine-B solution, and irradiate it under sunlight for 2h, the decolorization rate can reach 90%.

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Abstract

The invention relates to the preparation of an inorganic functional material, in particular to a photochemical catalyst prepared by taking a porous mineral as a carrier for carrying an n-typed semiconductor with a large energy gap and a method thereof. The natural porous mineral and an artificial porous mineral are used for preparing the carrier to carry the n-typed semiconductor and a compound semiconductor with photochemical catalysis function; the catalyst prepared is applied to the degradation of organic pollutants by photochemical catalysis or to serving as the filling of paints which can reproduce after being poisoned. The carrier prepared by the invention has large specific surface area, strong adsorption capacity, good adhesive force and low environment cost, can remarkably improve the efficiency of the photochemical catalyst and lower the poisoning risk of the catalyst; the sol of the semiconductor or the compound semiconductor has a photoresponse range covering visible light area and ultraviolet light area, thus being capable of effectively utilizing the light energy and being beneficial to reduce the cost of the light sources; the sol-gel dipping method is adopted to realize loading, which has the advantages of mild condition, even distribution, simple technique and convenience for mass production.

Description

Technical field: [0001] The invention relates to the preparation of an inorganic functional material, in particular to a photocatalyst prepared by using a porous mineral as a carrier and loading a wide band gap n-type semiconductor and a method thereof. technical background: [0002] with TiO 2 The heterogeneous photocatalytic technology represented by n-type semiconductors can realize the catalytic oxidation reaction that is difficult to realize under normal circumstances, and the catalyst itself is non-toxic, non-irritating, insoluble in solvents, and stable in chemical properties, so it can be processed at low concentrations and high Harmful organic pollution has achieved an effect that cannot be achieved by traditional treatment methods. Because of its almost non-selective mineralization of various organic pollutants, it has shown broad prospects in the fields of soil, water quality and air pollution control and antibacterial. With the development of society and the im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/04B01J29/90B01J21/16B01J21/06B01J21/20B01J23/14B01J23/92B01J23/06C02F1/30B01D53/86A61L9/22C09D7/12
CPCY02W10/37
Inventor 蒋引珊李芳菲孙萌萌夏茂盛薛兵任雪红
Owner JILIN UNIV
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