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Preparation and applications of alkali metal niobate photocatalytic material

An alkali metal niobate, photocatalytic material technology, applied in metal/metal oxide/metal hydroxide catalysts, hydrocarbon production from carbon oxides, physical/chemical process catalysts, etc., can solve problems such as low efficiency

Inactive Publication Date: 2014-04-09
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the problem of low efficiency in traditional oxide photocatalytic materials and improve the reduction of CO 2 s efficiency

Method used

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  • Preparation and applications of alkali metal niobate photocatalytic material
  • Preparation and applications of alkali metal niobate photocatalytic material

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0013] (1) Nb 2 o 5 , Na 2 CO 3 , K 2 CO 3 According to KNbO 3 Stoichiometric mixing.

[0014] (2) After grinding the mixture, preheat it at 800° C. for 4 hours.

[0015] (3) After regrinding, calcining at a temperature of 900° C. for 5 hours.

[0016] (4) Add KNbO to the methanol solution 3 Powder and chloroplatinic acid were irradiated by a 400W high-pressure mercury lamp for 1h.

[0017] (5) After the obtained precipitate was filtered, washed with distilled water and ethanol, and dried in an oven at 70° C. for 12 hours.

[0018] The invention provides a preparation method of an alkali metal niobate photocatalytic material and its photocatalytic reduction of CO 2 performance. Using CH 4 to evaluate the photocatalytic reduction of CO 2 performance. This scheme is further described by the following examples.

specific Embodiment approach 2

[0019] (1) 0.100g of Pt-KNbO 3 The powder sample is evenly dispersed on the bottom of a glass container, and the glass container is placed on the bottom of a high borosilicate glass container (this is a closed container).

[0020] (2) After sealing the reactor, use a gas sampler to inject CO into the reactor 2 After displacing the air therein, 3 mL of water was injected into the reactor with a liquid syringe. The reactor was placed in a dark place for 2 h to allow the system to reach adsorption-desorption equilibrium.

[0021] (3) Place the reactor under a xenon lamp light source to start the reaction, and regularly take samples from the reaction system, and use a gas chromatograph to detect CH 4 concentration.

[0022] After 6h of irradiation, CH 4 The production rate is 7.0ppm / h.

specific Embodiment approach 3

[0023] Different from the second specific embodiment, the photocatalytic material powder used in step (1) is Pt-NaNbO 3 , after 6h of reaction, CH 4 The production rate is 2.3ppm / h.

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Abstract

The invention discloses a preparation method of an alkali metal niobate photocatalytic material, and performances of the alkali metal niobate photocatalytic material in photocatalytic reduction of CO2. The preparation method of the KNbO3 photocatalytic material comprises following steps: Nb2O5, Na2CO3, and K2CO3 powder are mixed according to a stoichiometric ratio so as to obtain a mixture; the mixture is grinded for 0.5h, is preheated for 4h at a temperature of 800 DEG C, is grinded for a second time, and is calcined for 5h at a temperature of 900 DEG C; loading of precious metal Pt is realized via photodeposition; KNbO3 powder and chloroplatinic acid (H2PtCl6*6H2O) are added into a solution containing methanol, the solution is exposure under a 400W high pressure mercury lamp for 1h, and a precipitate is obtained via filtration, is washed with distilled water and ethanol, and is dried for 12h in a drying oven of 70 DEG C. It is found by researches on reducing properties of Pt-KNbO3 on CO2, generating rate of CH4 in reduction of CO2 using Pt-KNbO3 is higher than that in reduction of CO2 using Pt-NaNbO3.

Description

technical field [0001] The invention relates to the field of semiconductor material preparation and application, in particular to the preparation of an alkali metal niobate photocatalytic material. Background technique [0002] carbon dioxide (CO 2 ) is the final product of carbon and carbide oxidation, and is one of the abundant carbon sources in nature. Before the Industrial Revolution, atmospheric CO 2 The concentration is around 300ppm for a long time. Later, with the massive consumption of petroleum and fossil energy, CO 2 Concentrations in the Earth's atmosphere are increasing. Since 1958, atmospheric CO 2 The concentration has increased significantly year by year, reaching 393.09ppm in January 2012. During the last ten years (2002-2011), CO 2 Concentrations increased by an average of 2.07ppm per year, compared to 1.60ppm in the previous decade (1992-2001). Visible CO 2 The concentration increases faster and faster. For a long time in the future, human beings...

Claims

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Application Information

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IPC IPC(8): B01J23/648B01J35/00C07C1/02C07C9/04
Inventor 史海峰王颖超蓝奔月
Owner JIANGNAN UNIV
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