Method for preparing expanded graphite load nanometer bismuth vanadate photochemical catalyst

A technology of expanded graphite and photocatalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., and can solve problems such as unsatisfactory treatment effects and limited photoresponse range , to achieve the effect of simple preparation method, low equipment requirements and low cost

Inactive Publication Date: 2012-06-13
DONGHUA UNIV
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, many scholars have considered TiO 2 Although the photocatalytic degradation of organic pollutants in wat

Method used

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Examples

Experimental program
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Example Embodiment

[0022] Example 1

[0023] (1) Add bismuth nitrate and disodium ethylenediaminetetraacetic acid to the phosphate buffer, stir magnetically for 15 minutes to form a suspension; first dissolve the sodium metavanadate evenly in the phosphate buffer, and then add it dropwise In the above suspension, magnetically stirred uniformly to form a transparent solution; the amount and concentration of bismuth nitrate, sodium metaaluminate and disodium edetate are all 0.01mol / L, and the phosphate buffer is made of 0.025mol / L sodium dihydrogen phosphate and 0.05mol / L sodium hydrogen phosphate;

[0024] (2) Adjust the pH value of the above transparent solution with a concentration of 0.5mol / L sodium hydroxide solution to 4.5, and then add expanded graphite at 60°C. The mass ratio of bismuth salt to expanded graphite is 1:5, continuous magnetic force After stirring and mixing, refluxing for 6 hours, centrifuging, filtering, and washing, a yellow product can be obtained. Finally, the obtained produ...

Example Embodiment

[0025] Example 2

[0026] (1) Add bismuth chloride and sodium gluconate to the phosphate buffer, magnetically stir for 35 minutes to form a suspension; first dissolve the ammonium metavanadate evenly in the phosphate buffer, and then add dropwise to the above suspension In the liquid, the magnetic force is evenly stirred to form a transparent solution; the amount of bismuth chloride is 0.06mol / L, the amount of sodium gluconate is 0.03mol / L, and the amount of ammonium metaaluminate is 0.06mol / L. L, phosphate buffer is composed of 0.03mol / L sodium dihydrogen phosphate and 0.08mol / L sodium hydrogen phosphate;

[0027] (2) Adjust the pH value of the above transparent solution with a potassium hydroxide solution with a degree of 1mol / L to 7, and then add expanded graphite at 80°C, where the mass ratio of bismuth salt to expanded graphite is 1:12, continuous magnetic stirring After mixing, refluxing for 15 hours, centrifuging, filtering, and washing, a yellow product can be obtained. Fi...

Example Embodiment

[0028] Example 3

[0029] (1) Add bismuth acetate and butane tetracarboxylic acid to the phosphate buffer, magnetically stir for 60 minutes to form a suspension; first dissolve potassium metavanadate in the phosphate buffer, and then add it dropwise to the above suspension In the turbid liquid, magnetically stirred uniformly to form a transparent solution; the amount concentration of bismuth acetate substance is 0.15 mol / L, the amount concentration of butane tetracarboxylic acid substance is 0.05 mol / L, and the amount concentration of potassium metaaluminate and sodium is 0.15mol / L, phosphate buffer is composed of 0.05mol / L sodium dihydrogen phosphate and 0.1mol / L sodium hydrogen phosphate;

[0030] (2) Adjust the pH of the above transparent solution to 9 with a sodium hydroxide aqueous solution with a concentration of 1.5mol / L, and then add expanded graphite at 100°C. The mass ratio of bismuth salt to expanded graphite is 1:20, continuous magnetic force After stirring and mixing,...

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Abstract

The invention relates to a method for preparing expanded graphite load nanometer bismuth vanadate photochemical catalyst, which comprises the following steps: 1 adding bismuthate and stabilizing agent into phosphate buffer, stirring for 15 to 60 minutes to form turbid liquid, dissolving metavanadate into the phosphate buffer uniformly, adding the phosphate buffer into the turbid liquid, and stirring the solution to be uniform to form transparent solution; and 2 regulating potential of hydrogen (pH) value through alkaline solution, adding expanded graphite at the temperature of 20 DEG C to 100 DEG C, stirring, mixing, refluxing for 6 hours to 24 hours, centrifuging, filtering, washing, finally roasting the obtained products, cooling and grinding to obtain the final product. The method is low in cost, easy to apply and good in maneuverability and has low requirements for devices. The obtained expanded graphite powder bismuth vanadate is even in self-assembly, can efficiently degrade durable toxic and harmful substances under conditions of ultraviolet light and visible light, can be recovered and recycled easily and conveniently and is very suitable for deep processing of waste water.

Description

technical field [0001] The invention belongs to the field of preparation of bismuth vanadate photocatalysts, in particular to a preparation method of expanded graphite supported nano bismuth vanadate photocatalysts. Background technique [0002] In recent years, titanium dioxide (TiO 2 ) as the core representative of photocatalytic technology in the field of environmental pollution control, especially in the treatment of refractory biodegradable wastewater and air purification is more and more widely used, but because of its wide band gap, it can only be effective under the irradiation of ultraviolet light Photocatalysis, thus limiting the further expansion of its application field. In order to be able to increase the TiO 2 For the utilization efficiency of sunlight, many experts and scholars at home and abroad focus on TiO2 which responds to visible light. 2 A lot of research work has been carried out on photocatalysts, mainly for TiO 2 Photocatalyst surface structure m...

Claims

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Application Information

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IPC IPC(8): B01J23/22C02F1/30C02F1/32C02F1/28
Inventor 李浩刘保江高品
Owner DONGHUA UNIV
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