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Method for preparing composite photocatalyst Bi5ONO7

A technology of catalyst and composite light, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effect of promoting practical application, good crystallinity, and simple preparation process

Inactive Publication Date: 2009-11-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the problem of synthesis technology, among many bismuth-based composite oxides, Bi 5 ONO 7 is an unreported photocatalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Composite photocatalyst Bi 5 ONO 7 The preparation method, it comprises the steps:

[0020] 1) Weigh 0.4851 gram of bismuth nitrate pentahydrate [Bi(NO 3 ) 3 ·5H 2 O], be made into the suspension of 0.014 mol / liter with 70ml of deionized water, the suspension was stirred for 15 minutes, fully mixed to obtain suspension A;

[0021] 2) adjust the pH value of the suspension A to 12 with concentrated ammonia water (produce a large amount of flocculation precipitation), and obtain a solution containing a large amount of white flocs;

[0022] 3) Add 0.5ml Triton X-100 to the above-mentioned solution containing a large amount of white flocs, a large amount of foam is generated on the surface, and a suspension B is obtained;

[0023] 4) Transfer the above suspension B to a 100 ml stainless steel reactor lined with polytetrafluoroethylene, control the filling degree of its hydrothermal reaction to be 70% (the volume of suspension B is 70 ml), and tightly cover the reaction ...

Embodiment 2

[0027] Composite photocatalyst Bi 5 ONO 7 The preparation method, it comprises the steps:

[0028] 1) Weigh 0.2425 grams of bismuth nitrate pentahydrate [Bi(NO 3 ) 3 ·5H 2 O], be made into the suspension of 0.007 mol / liter with 70ml of deionized water, the suspension was stirred for 15 minutes, fully mixed to obtain suspension A;

[0029] 2) adjust the pH value of the suspension A to 12 with concentrated ammonia water (produce a large amount of flocculation precipitation), and obtain a solution containing a large amount of white flocs;

[0030] 3) Add 0.2ml Triton X-100 to the above solution containing a large amount of white flocs to obtain suspension B;

[0031] 4) Transfer the above suspension B to a 100 ml stainless steel reaction kettle lined with polytetrafluoroethylene, control the filling degree of its hydrothermal reaction to 70% (volume), put the lid of the reaction kettle tightly into a constant temperature oven , kept at 180°C for 24 hours;

[0032] 5) After...

Embodiment 3

[0035] Composite photocatalyst Bi 5 ONO 7 The preparation method, it comprises the steps:

[0036] 1) Weigh 0.4851 gram of bismuth nitrate pentahydrate [Bi(NO 3 ) 3 ·5H 2 O], be made into the suspension of 0.014 mol / liter with 70ml of deionized water, the suspension was stirred for 15 minutes, fully mixed to obtain suspension A;

[0037] 2) adjust the pH value of the suspension A to 12 with concentrated ammonia water (produce a large amount of flocculation precipitation), and obtain a solution containing a large amount of white flocs;

[0038] 3) Add 0.2ml Triton X-100 to the above solution containing a large amount of white flocs to obtain suspension B;

[0039]4) Transfer the above suspension B to a 100 ml stainless steel reaction kettle lined with polytetrafluoroethylene, control the filling degree of its hydrothermal reaction to 70% (volume), put the lid of the reaction kettle tightly into a constant temperature oven In the middle, keep at 160~2800℃ for 24 hours;

...

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Abstract

The invention relates to a method for preparing a bismuth composite oxide. The method for preparing a composite photocatalyst Bi5ONO7 is characterized by comprising the following steps: 1) dissolving Bi(NO3)3.5H2O into distilled water to form solution of which molar concentration is 0.007 to 0.028 mol / L, and stirring the solution for 15 to 30 minutes to form suspension A; 2) adjusting the pH value of the suspension to 11 to 14 by using strong aqua ammonia to form solution containing large amount of white floccules; 3) according to the ratio of the suspension A to Trion X-100 of 70 milliliters to 0.2-1.5 milliliters, weighing the Trion X-100, and adding the Trion X-100 into the solution containing large amount of white floccules to form suspension B; 4) transferring the suspension B to a reaction kettle, and maintaining the temperature at 160-200 DEG C for 4 to 24 hours; and 5) taking out a product in the reaction kettle, and filtering, washing and drying the product to obtain the composite photocatalyst Bi5ONO7. The method has simple process and low cost, and the prepared Bi5ONO7 has good visible photocatalysis activity.

Description

technical field [0001] The invention relates to a preparation method of a bismuth-based composite oxide, belonging to the field of inorganic nanometer photocatalytic materials. Background technique [0002] Photocatalyst, as a new type of "green" material, has received extensive attention in the field of environmental protection, and is one of the most promising environmental protection technologies. The principle of photocatalytic reaction is that photocatalytic valence band electrons absorb photons whose energy exceeds the energy corresponding to the band gap, generate excitation to generate photogenerated holes and electrons, and then migrate to the surface of the catalyst to perform redox reactions with adsorbed organic pollutants or water molecules. process. The degradation of environmental pollutants by photocatalytic technology has the outstanding characteristics of low energy consumption, mild reaction conditions, easy operation, and can reduce secondary pollution. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/10A62D3/17C02F1/30A62D101/20A62D101/43C02F101/30C02F101/20
Inventor 张高科余姝洁杨艳青蒋韦张水明沈雄
Owner WUHAN UNIV OF TECH