Bismuthic acid barium-sodium catalyst with visible light respond and production thereof

A technology of photocatalyst and barium bismuthate, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effect of simple preparation method, good application prospect, and promotion of practical application

Inactive Publication Date: 2006-08-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, the relevant domestic patent documents are as follows: 1. Photocatalyst and application thereof for visible light response of bismuth-based composite metal oxides of alkali metals and Ag, application number: 03158264.8, literature reports MBiO 3 (M=Ag, Li, Na, at least one of K) and its preparation, but studies have shown that this type of photocatalyst can also oxidize and degrade organic pollutants under no light conditions, so the stability of this photocatalyst needs further research

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  • Bismuthic acid barium-sodium catalyst with visible light respond and production thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024]Weigh 1.264 g of sodium bismuthate, add 32 ml of 0.5 mol / L barium chloride, the molar ratio of barium chloride and sodium bismuthate is 4:1, stir the mixed solution for 30 minutes, and mix well. The mixed suspension is transferred to a stainless steel autoclave lined with polytetrafluoroethylene. The volume of the still is 50 milliliters, and water is added to 45 milliliters, and the degree of filling is 90%. 2 days. The product in the kettle was taken out, washed three times with deionized water and acetone, and dried in a constant temperature oven at 60° C. for 48 hours to obtain a tan barium sodium bismuthate photocatalyst powder. The mass percent of each metal element determined by ICP is: Bi 67.07%, Ba 10.97%, Na 0.63%.

[0025] The photocatalytic performance experiment of the present invention can be tested by degrading phenol in water under visible light. Measuring process is as follows: in the photocatalytic reactor of 250 milliliters, add 200 milliliters conce...

Embodiment 2

[0028] Weigh 1.264 g of sodium bismuthate, add 32 ml of 0.5 mol / L barium chloride, the molar ratio of barium chloride and sodium bismuthate is 4:1, stir the mixed solution for 30 minutes, and mix well. The mixed suspension is transferred to a stainless steel autoclave lined with polytetrafluoroethylene, and the volume of the still is 50 milliliters. Add water to 30 milliliters, and the filling degree is 60%. Tighten the lid of the kettle, and put it into an oven at 90°C to keep 3 days. The product in the kettle was taken out, washed three times with deionized water and acetone, and dried in a constant temperature oven at 60° C. for 48 hours to obtain gray-brown barium sodium bismuthate photocatalyst powder. The mass percent of each metal element determined by ICP is: Bi 63.37%, Ba 9.88%, Na 1.56%. The performance test results of phenol degradation: under the irradiation of visible light with a wavelength greater than 400nm, the phenol removal rate reached 98.2% and the TOC re...

Embodiment 3

[0030] Weigh 1.264 g of sodium bismuthate, add 48 ml of 0.5 mol / liter barium chloride, the molar ratio of barium chloride and sodium bismuthate is 6:1, stir the mixed solution for 30 minutes, and mix well. The mixed suspension was placed in an oil bath and kept at a constant temperature of 90°C for 2 days. The product in the kettle was taken out, washed three times with deionized water and acetone, and dried in a constant temperature oven at 60° C. for 48 hours to obtain brown-gray sodium barium bismuthate photocatalyst powder. The mass percent of each metal element determined by ICP is: Bi 64.18%, Ba 8.89%, Na 1.57%. The performance test results of phenol degradation: under the irradiation of visible light with a wavelength greater than 400nm, the phenol removal rate reached 93.5% and the TOC removal rate reached 90.4% within 120 minutes.

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Abstract

A barium sodium bismuthate as photocatalyst response to visual light for catalytic degradation to toxic and harmful chemical substances is prepared from sodium bismuthate and Ba salt through adding sodium bismuthate to the solution of Ba salt, stirring, hydrothermal reaction, washing and baking. It has high hotocatalytic activity for UV, visual light and natural light.

Description

technical field [0001] The invention relates to a photocatalyst and its preparation method, in particular to a visible light responsive barium bismuth sodium photocatalyst and its preparation method. The prepared photocatalyst is a composite metal composed of sodium, barium, bismuth and oxygen elements Oxide semiconductor powder with photocatalytic activity under visible light. The invention belongs to the field of inorganic nanometer photocatalytic materials. Background technique [0002] The sun is a huge, long-term, and endless energy source. Various forms of energy on the earth come directly or indirectly from solar energy. However, there are many problems in the development and utilization of solar energy due to the low energy density of solar energy and the characteristics of regional and seasonal changes. The current environmental problems and energy crisis have become the two bottlenecks restricting human development, and photocatalytic technology is expected to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/00C01G29/00C02F1/30C02F1/62B01D53/72C02F101/30
CPCY02W10/37
Inventor 蔡伟民龙明策
Owner SHANGHAI JIAO TONG UNIV
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