Method for preparing Ag/AgCl/BiMg2VO6 composite photocatalyst

A catalyst and composite light technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low photocatalytic activity, inhibiting the effective separation of carriers, limiting the range of light absorption, etc. Achieve the effects of low reaction temperature, good photocatalytic activity and simple process

Active Publication Date: 2012-10-03
WUHAN UNIV OF TECH
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  • Description
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  • Application Information

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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

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Embodiment 1

[0028] Ag / AgCl / BiMg with Visible Light Photocatalytic Activity 2 VO 6 The preparation method of composite photocatalyst, it comprises the following steps:

[0029] 1) Add 0.072 mol (i.e. 15.1301 g) of citric acid to 30 mL of deionized water, then add 0.018 mol (i.e. 8.7318 g) of bismuth nitrate pentahydrate, heat and stir at 80 °C to obtain milky white solution A; take 0.048 mol (i.e. 14.0275 g, about 14 g) chelating agent EDTA was added to 30 mL of 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;

[0030] Take 0.036 mol (9.2308 g) of magnesium nitrate hexahydrate and 0.018 mol (2.1058 g) of ammonium metavanadate, and add them to 30 mL of deionized water respectively to obtain magnesium nitrate hexahydrate solution and ammonium metavanadate solution, and then add the above In bismuth acid solution, heat and stir continuously at 80 °C for 3-5 h to obtai...

Embodiment 2

[0040] Ag / AgCl / BiMg with Visible Light Photocatalytic Activity 2 VO 6 The preparation method of composite photocatalyst, it comprises the following steps:

[0041] 1) Preparation of BiMg 2 VO 6 The process of base material is completely consistent with the step 1) of embodiment 1;

[0042] 2) Take 0.5 g BiMg 2 VO 6 The matrix material was added to 30 mL deionized water and ultrasonicated for 10 min to obtain BiMg 2 VO 6 suspension;

[0043] Ag ion / BiMg in silver nitrate solution 2 VO 6 The proportion of matrix material is 1 mmol / 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;

[0044] 3) According to the molar ratio of Ag ions in the silver nitrate solution to H ions in the hydrochloric acid solution was 1:1, slowly add 5 mL of hydrochloric acid solution with a concentration of 0.1 mol / L, sonicate for 10 mi...

Embodiment 3

[0048] Ag / AgCl / BiMg with Visible Light Photocatalytic Activity 2 VO 6 The preparation method of composite photocatalyst, it comprises the following steps:

[0049] 1) Preparation of BiMg 2 VO 6 The process of base material is completely consistent with the step 1) of embodiment 1;

[0050] 2) Take 0.5 gBiMg 2 VO 6 The matrix material was added to 30 mL deionized water and ultrasonicated for 10 min to obtain BiMg 2 VO 6 suspension;

[0051] Ag ion / BiMg in silver nitrate solution 2 VO 6 The proportion of matrix material is 3 mmol / 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;

[0052] 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 0.1 mol / L, sonicate for 10 mi...

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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 Applications(China)
IPC IPC(8): B01J27/10
Inventor 张高科郭睿
Owner WUHAN UNIV OF TECH
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