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Preparation method for carbon nanotube-nano-bismuth vanadate composite photocatalyst

A carbon nanotube and bismuth vanadate technology, which is applied in the field of preparation of nanometer bismuth vanadate composite photocatalyst, can solve the problems of unsatisfactory treatment effect, limited light response range and the like, and achieves simple and feasible preparation method, low requirements, and utilization of The effect of recycling

Inactive Publication Date: 2012-06-20
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 water has achieved certain results, the treatment effect is often not ideal due to the limitation of its photoresponse range.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Add bismuth nitrate and disodium edetate into the phosphate buffer, and stir magnetically for 30 minutes to form a suspension; dissolve sodium metavanadate evenly in the phosphate buffer, and then add it dropwise to the In the above-mentioned suspension, the constant magnetic stirring is uniform to form a transparent solution; wherein the molar concentration of bismuth nitrate and sodium metavanate is 0.05mol / L, and the molar concentration of disodium edetate is 0.01mol / L. L, phosphate buffer saline is made up of potassium dihydrogen phosphate and 0.035mol / L sodium hydroxide that the concentration of substance is 0.05mol / L;

[0023] (2) Using a sodium hydroxide solution with a concentration of 1.0mol / L to adjust the pH value of the above-mentioned transparent solution to 6.0, then adding carbon nanotubes at 40°C, the mass ratio of bismuth nitrate to carbon nanotubes is 1: 2, continuous Magnetic stirring and mixing, centrifugation, filtration, washing, putting into a...

Embodiment 2

[0025] (1) Add bismuth acetate and butane tetracarboxylic acid into the phosphate buffer, and stir magnetically for 45 minutes to form a suspension; dissolve potassium metavanadate evenly in the phosphate buffer, and then add it dropwise to the above suspension In the turbid liquid, the magnetic stirring is continued to form a transparent solution; the concentration of bismuth acetate and potassium metavanadate is 0.15mol / L, the concentration of butane tetracarboxylic acid is 0.025mol / L, and the concentration of phosphate buffer The liquid is composed of potassium dihydrogen phosphate with a concentration of 0.05mol / L and sodium hydroxide with a concentration of 0.035mol / L;

[0026] (2) The pH value of the above-mentioned transparent solution is adjusted to 7.0 by using an aqueous sodium hydroxide solution with a concentration of 2.0mol / L, and then carbon nanotubes are added at 70° C. The mass ratio of bismuth acetate to carbon nanotubes is 1: 5, continuously Magnetically stir...

Embodiment 3

[0028] (1) Add bismuth chloride and sodium gluconate to the phosphate buffer, stir magnetically for 60 minutes to form a suspension; dissolve ammonium metavanadate evenly in the phosphate buffer, and then add it dropwise to the above suspension In the solution, the magnetic force is constantly stirred to form a transparent solution; wherein the molar concentration of bismuth chloride and ammonium metavanadate is 0.25mol / L, the molar concentration of sodium gluconate is 0.05mol / L, and the phosphate buffer is composed of The concentration of the substance is composed of potassium dihydrogen phosphate of 0.05mol / L and sodium hydroxide of 0.035mol / L;

[0029] (2) adopt concentration to be 3.0mol / L potassium hydroxide aqueous solution and adjust the pH value of above-mentioned transparent solution to be 8.0, then add carbon nanotube at 100 ℃, the mass ratio of bismuth chloride and carbon nanotube is 1: 10, Continuous magnetic stirring and mixing, centrifugation, filtration, washing...

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Abstract

The present invention relates to a preparation method for a carbon nanotube-nano-bismuth vanadate composite photocatalyst. The method comprises: (1) adding a bismuth salt and a stabilizing agent to a phosphate buffer solution, stirring to form a suspension, dissolving metavanadate in the phosphate buffer solution, adding to the suspension, and stirring to form a transparent solution; (2) adopting an alkaline solution to adjust the pH value of the transparent solution to 6.0-8.0, adding carbon nanotubes while maintaining a temperature to 40-100 DEG C, stirring until uniformly mixing, centrifugating, filtering, washing, placing into a muffle furnace to carry out baking, and finally cooling and grinding to obtain the finished product. The preparation method of the present invention has characteristics of simpleness, easy performance, low requirements on equipment, and good operability. The prepared carbon nanotube powder bismuth vanadate is uniformly distributed, the persistent toxic substances can be efficiently degraded under the ultraviolet light condition and the visible light condition with the prepared carbon nanotube powder bismuth vanadate, the prepared carbon nanotube powder bismuth vanadate is convenient to use, and can be recovered and regenerated.

Description

technical field [0001] The invention belongs to the field of preparation of nano bismuth vanadate composite photocatalyst, in particular to a preparation method of carbon nanotube-nano bismuth vanadate composite photocatalyst. 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 ...

Claims

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Application Information

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IPC IPC(8): B01J23/22C02F1/30C02F1/28C02F101/30
Inventor 高品刘保江张士兵薛罡刘振鸿
Owner DONGHUA UNIV
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