Preparation method of nano-grade metal phosphide composite photo catalyst

A metal phosphide, nano-scale technology, used in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as poor stability and narrow band gap, and achieve high catalytic activity and synergy. , the effect of improving the separation efficiency

Inactive Publication Date: 2018-02-27
宁波科邦华诚技术转移服务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few studies on the photocatalysis of metal phosphides; because the reducibility of phosphides is generally strong, theoretically speaking, most of these compounds are black and have a small band gap, so they are not suitable as photocatalysts alone, resulting in the reduction of metal phosphides. There is a certain relationship between the narrow band gap and poor stability. It is one of the research focuses to seek a new type of nano-scale stable metal phosphide composite photocatalyst.

Method used

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  • Preparation method of nano-grade metal phosphide composite photo catalyst

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Embodiment 1

[0014] A preparation method of a nanoscale metal phosphide composite photocatalyst, the method comprising the following steps:

[0015] Step 1, mix the powdered Bi-V-O composite material obtained after drying with NaH 2 PO 2 Place them together in a tube furnace with a mass ratio of 5:1. The two are separated by quartz wool. Under the protection of Ar, heat up from room temperature at 20°C with a heating rate of 2°C / min and react at 350°C for 3 hours to obtain primary product;

[0016] Step 2. The primary product obtained after phosphating was cross-washed 5 times with deionized water and absolute ethanol, centrifuged at 8500r / min for 6min, and dried in an oven at 60°C to obtain black nano-scale BiP-V 3 P 5 Composite metal phosphides;

[0017] Step 3, put 25gBiP-V 3 P 5 The composite metal phosphide was put into an aluminum chloride solution with a mass fraction of 8% and stirred at 90°C for 5 hours, filtered, washed until neutral, dried, dispersed in ethanol-deionized a...

Embodiment 2

[0023] Step 4, 10g modified BiP-V 3 P 5 After drying with 35g of SBA-15 zeolite material, grind and pulverize, sieve with 600 mesh, mix and stir evenly at 90°C, disperse in ethanol-deionized aqueous solution, add 14g of cetyltrimethylammonium bromide in a water bath at 60°C Stir in medium for 4 hours, ultrasonically disperse for 30 minutes, suction filter, wash, vacuum dry to constant weight, grind and sieve to get BiP-V 3 P 5 / SBA-15 nanometer photocatalytic material. All the other steps are the same as in Example 1.

Embodiment 3

[0025] Step 4, 5g modified BiP-V 3 P 5 After drying with 35g of SBA-15 zeolite material, grind and pulverize, sieve with 600 mesh, mix and stir evenly at 90°C, disperse in ethanol-deionized aqueous solution, add 14g of cetyltrimethylammonium bromide in a water bath at 60°C Stir in medium for 4 hours, ultrasonically disperse for 30 minutes, suction filter, wash, vacuum dry to constant weight, grind and sieve to get BiP-V 3 P 5 / SBA-15 nanometer photocatalytic material. All the other steps are the same as in Example 1.

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Abstract

The invention discloses a preparation method of a nano-grade metal phosphide composite photo catalyst. The preparation method comprises the following steps: synthesizing Bi(NO3)3.5H2O, NaVO3, polyvinylpyrrolidone, terephthalic acid, N,N-dimethyl formamide, NaH2PO2, octadecylamine and SBA-15 serving as main raw materials in a dynamic kettle by using a solvothermal method to obtain a hair-bulb-shaped Bi-V-O composite material; then, performing Ar protection in a tubular furnace; phosphorizing the Bi-V-O composite material with a phosphorus source to obtain particulate nano-grade BiP-V3P5 metal phosphide, wherein the nano-grade metal phosphide composite photo catalyst has the characteristics of metal and semi-metal; the mass ratio of BiP-V3P5 to SBA-15F is 3 to 7; the mass ratio of the Bi(NO3)3.5H2O to NaVO3 is 3 to 1; the mass ratio of the polyvinylpyrrolidone to the terephthalic acid is 4 to 5. The preparation process is novel, has a good visible light degrading effect, can contribute to cost lowering and pollution lowering, and has a better application prospect and economic benefit on the aspect of organic pollutant decomposition.

Description

technical field [0001] The invention relates to a nanoscale metal phosphide composite photocatalyst and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] With the advancement of human science and technology civilization, the industry has been developed on a large scale, and automobiles have become more and more popular, and a large amount of nitrogen oxides have been discharged into the atmosphere. Nitrogen oxides are pollutants of photochemical smog, acid rain, and ozone depletion. Nitrogen oxides have become an urgent problem of air pollution in all countries in the world. The photocatalyst can degrade nitrogen oxides under the action of photocatalysis to generate H 2 O.CO 2 , salt, etc. to achieve harmlessness, thereby purifying the environment. At present, there are few studies on the photocatalysis of metal phosphides; because the reducibility of phosphides is generally strong, theoretically speaking, most of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01D53/86B01D53/56
CPCB01D53/8628B01D2259/802B01J29/0341B01J35/004B01J35/023
Inventor 于金凤张瑞丰
Owner 宁波科邦华诚技术转移服务有限公司
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