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Method for preparing Ag/AgCl/BiMg2VO6 composite photocatalyst

A technology of catalyst and composite light, applied in the direction of physical/chemical process catalyst, chemical instrument and method, chemical/physical process, etc., can solve the problems of inhibiting the effective separation of carriers, limiting the absorption range of light, low photocatalytic activity, etc.

Active Publication Date: 2013-12-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, we found that the wider energy bandgap limits its light absorption range and inhibits the effective separation of its carriers, resulting in lower photocatalytic activity.
Therefore, the present invention modifies BiMg with Ag / AgCl system 2 VO 6 , prepared Ag / AgCl / BiMg by impregnation-deposition-photoreduction method 2 VO 6 The composite photocatalyst uses its surface plasmon effect to improve the photocatalytic activity of visible light. At present, there are no relevant reports on the preparation and catalytic application of this composite catalyst.

Method used

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  • Method for preparing Ag/AgCl/BiMg2VO6 composite photocatalyst

Examples

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Effect test

Embodiment 1

[0027] Ag / AgCl / BiMg with Visible Light Photocatalytic Activity 2 VO 6 The preparation method of composite photocatalyst, it comprises the following steps:

[0028] 1) Add 0.072mol (ie 15.1301g) of citric acid to 30mL of deionized water, then add 0.018mol (ie 8.7318g) of bismuth nitrate pentahydrate, heat and stir at 80°C to obtain a milky white solution A; take 0.048mol ( That is, 14.0275g (approximately 14g) chelating agent EDTA was added to 30mL ammonia water, stirred and dissolved, then added to the above solution A, and heated and stirred at 80°C until a colorless and transparent bismuth acid solution was formed;

[0029] Take 0.036mol (9.2308g) of magnesium nitrate hexahydrate and 0.018mol (2.1058g) of ammonium metavanadate, and add them to 30mL deionized water respectively to obtain magnesium nitrate hexahydrate solution and ammonium metavanadate solution, and then add the above bismuth In the acid solution, continue heating and stirring at 80°C for 3-5h to obtain a bl...

Embodiment 2

[0039] Ag / AgCl / BiMg with Visible Light Photocatalytic Activity 2 VO 6 The preparation method of composite photocatalyst, it comprises the following steps:

[0040] 1) Preparation of BiMg 2 VO 6 The process of base material is completely consistent with the step 1) of embodiment 1;

[0041] 2) Take 0.5g BiMg 2 VO 6 The matrix material was added to 30mL deionized water and ultrasonicated for 10min to obtain BiMg 2 VO 6 suspension;

[0042] Ag ion / BiMg in silver nitrate solution 2 VO 6 The proportion of matrix material is 1mmol / g, in the above BiMg 2 VO 6 Slowly add 5 mL of silver nitrate solution with a concentration of 0.1 mol / L dropwise into the suspension, sonicate for 10 min, and stir for 20 min at room temperature in the dark;

[0043] 3) According to the molar ratio of Ag ions in the silver nitrate solution to H ions in the hydrochloric acid solution is 1:1, slowly add 5 mL of hydrochloric acid solution with a concentration of 0.1mol / L, sonicate for 10 minutes...

Embodiment 3

[0047] Ag / AgCl / BiMg with Visible Light Photocatalytic Activity 2 VO 6 The preparation method of composite photocatalyst, it comprises the following steps:

[0048] 1) Preparation of BiMg 2 VO 6 The process of base material is completely consistent with the step 1) of embodiment 1;

[0049] 2) Take 0.5gBiMg 2 VO 6 The matrix material was added to 30mL deionized water and ultrasonicated for 10min to obtain BiMg 2 VO 6 suspension;

[0050] Ag ion / BiMg in silver nitrate solution 2 VO 6 The proportion of matrix material is 3mmol / g, in the above BiMg 2 VO 6 Slowly add 15 mL of silver nitrate solution with a concentration of 0.1 mol / L dropwise into the suspension, sonicate for 10 min, and stir for 20 min at room temperature in the dark;

[0051] 3) According to the molar ratio of Ag ions in the silver nitrate solution to H ions in the hydrochloric acid solution is 1:1, slowly add 15 mL of hydrochloric acid solution with a concentration of 0.1mol / L, sonicate for 10 minute...

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Abstract

The invention provides a method for preparing an Ag / AgCl / BiMg2VO6 composite photocatalyst with a visible light photocatalytic activity. The method is characterized in by comprising the following steps: obtaining a BiMg2VO6 base material from the raw materials: bismuth nitrate pentahydrate, magnesium nitrate hexahydrate, and ammonium metavanadate, by a sol-gel method; adding BiMg2VO6 into deionized water and then ultrasonically treating the mixed solution; then, slowly dropwise adding 0.1 mol / L silver nitrate solution at a proportion of 1 to 3 mmol / g of Ag / BiMg2VO6 and then ultrasonically treating the mixed solution for 10 min, and stirring the mixed solution for 20 min at room temperature in the dark; slowly adding 0.1 mol / L hydrochloric acid solution into the mixed solution at a mole ratio of 1:1 or 1:2 of H ions in the silver nitrate solution to H ions in the hydrochloric acid solution, ultrasonically treating and stirring the mixed solution to generate a AgCl / BiMg2VO6 composite photocatalyst; and optically reducing the AgCl / BiMg2VO6 composite photocatalyst at an ultraviolet lamp of 20 W to obtain the Ag / AgCl / BiMg2VO6 composite photocatalyst. The composite photocatalyst prepared by the method has a high photocatalytic activity in visible light and a simple preparation process.

Description

technical field [0001] The invention relates to a Ag / AgCl / BiMg with visible light photocatalytic activity 2 VO 6 The preparation of a composite photocatalyst belongs to the technical field of photocatalysis and new materials. Background technique [0002] With the increasing environmental pollution and people's awareness of environmental protection, the research on photocatalyst treatment of printing and dyeing wastewater has become a hot spot in catalytic science research. Among them, TiO 2 Semiconductor photocatalysts have attracted much attention due to their stable chemical properties, strong oxidation, non-toxicity, and low cost. But since TiO 2 The higher requirements on the excitation light energy and the wider energy bandgap determine that its light absorption threshold is limited to the ultraviolet region, so the utilization rate of sunlight is low, which further limits its practical application. Therefore, developing a new type of catalyst with higher photocat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/10
Inventor 张高科郭睿
Owner WUHAN UNIV OF TECH
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