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Microwave synthesis method of bismuth vanadate/bismuth phosphate compound visible-light-induced photocatalyst

A technology of microwave synthesis and bismuth phosphate, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as energy consumption and time-consuming, and achieve stable reaction system, shorten the reaction time, and improve the effect of reaction efficiency

Inactive Publication Date: 2019-12-27
HUANGGANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned preparation methods have a common problem, which is time-consuming and energy-consuming

Method used

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  • Microwave synthesis method of bismuth vanadate/bismuth phosphate compound visible-light-induced photocatalyst
  • Microwave synthesis method of bismuth vanadate/bismuth phosphate compound visible-light-induced photocatalyst
  • Microwave synthesis method of bismuth vanadate/bismuth phosphate compound visible-light-induced photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of BiVO 4 / BiPO 4 composite photocatalyst

[0032] The preparation steps are as follows:

[0033] (1) Add 1g of sodium dodecyl sulfate (SDS) into 50mL of 1mol / L dilute nitric acid, ultrasonically disperse and dissolve, then add 4.85g of bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O), ultrasonic dispersion and dissolving obtain solution A;

[0034] (2) 0.58g ammonium metavanadate (NH 4 VO 3 ), 1.79g disodium hydrogen phosphate (Na 2 HPO 4 ) was dissolved in 50mL pure water, and ultrasonically dispersed and dissolved to obtain solution B;

[0035] (3) Slowly add B to A, stir while adding, and mix well to obtain solution C;

[0036] (4) Transfer solution C into a round-bottomed flask, connect the reflux device, and microwave under the condition of microwave irradiation (the power of microwave is 650W, the intermittent work takes 30s as a working cycle, work for 12s, and stop for 18s). Heated for 20 minutes to obtain the reflux liquid;

[0037] (5) Cool the r...

Embodiment 2

[0043] 1. Product characterization

[0044] (1)XRD pattern

[0045] Such as figure 1 Shown, find that the product synthesized by embodiment 1 proves to be BiVO by comparison with the standard collection of illustrative plates 4 / BiPO 4 Complex.

[0046] (2) SEM image

[0047] from figure 2 It can be seen that the yttrium tungstate synthesized in Example 1 is a porous group structure formed by the accumulation of many small particles.

[0048] 2. Catalytic performance test

[0049] (1) Test method

[0050] Take 50mL of 10mg / L methyl orange solution in a 250ml beaker, add 1.0g / L photocatalyst, ultrasonically disperse for 30s, transfer it to a dark room, let it stand for 30min, and add 0.20ml H 2 o 2 As an initiator, a 350W xenon lamp is used as a visible light source for photocatalytic degradation of methyl orange solution (filter light below 400nm with a filter), and the height of the sample liquid level to the outlet of the xenon lamp light source is about 14cm for p...

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Abstract

The invention discloses a microwave synthesis method of a bismuth vanadate / bismuth phosphate compound visible-light-induced photocatalyst, which comprises the following steps: (1) adding a surfactantinto dilute nitric acid, carrying out ultrasonic dispersion dissolution, adding bismuth nitrate, and carrying out ultrasonic dispersion dissolution to obtain a solution A; (2) adding ammonium metavanadate and disodium hydrogen phosphate into water, and ultrasonically dispersing and dissolving to obtain a solution B; (3) slowly adding the solution B into the solution A, and uniformly mixing the solutions to obtain a solution C; (4) transferring the solution C into a round-bottom flask, carrying out microwave irradiation, and carrying out heating reflux to obtain reflux liquid; and (5) removingthe supernatant of the reflux, carrying out centrifugal separation, washing the precipitate with pure water, and dehydrating and drying the photocatalyst. The method provided by the invention is simple, efficient, energy-saving and environment-friendly, the preparation time is greatly shortened, and the prepared product has good photocatalytic performance and high catalytic performance.

Description

technical field [0001] The invention belongs to the field of inorganic synthesis, and in particular relates to a microwave synthesis method of bismuth vanadate and bismuth phosphate composite visible light catalyst. Background technique [0002] BiVO 4 The bandgap width of 2.4eV, in addition, it has the characteristics of cheaper price, higher light utilization efficiency, reusability and simpler production. BiVO 4 It has good catalytic activity under visible light irradiation, it is non-toxic, harmless, non-corrosive, reusable, and can completely mineralize pollutants into H 2 O.CO 2 . [0003] Bismuth phosphate photocatalyst has a high electron-hole separation rate. The phosphate in bismuth phosphate has a large negative charge. These negative charges greatly increase the dipole moment of bismuth phosphate, and these dipole moments have a very positive effect on the separation of electron-hole pairs. Then make it obtain higher photocatalytic activity. PO 4 3- It h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/186B01J23/22B01J37/34C02F1/30
CPCB01J27/186B01J23/22B01J23/002B01J37/346C02F1/30C02F2305/10C02F2101/308B01J35/39
Inventor 廖学红廖万鹏
Owner HUANGGANG NORMAL UNIV
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