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Preparation method of compound photocatalyst

A catalyst and recombination light technology, applied in the field of environmental governance, can solve the problems of fast electron-hole recombination, unsatisfactory application effect, and insufficient specific surface area, and achieve the effect of reducing the band gap

Inactive Publication Date: 2016-03-30
ZHEJIANG INST OF GEOLOGY & MINERAL RESOURCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although g-C 3 N 4 It has a wide range of applications, but due to reasons such as fast electron-hole recombination and insufficient specific surface area, the actual application effect is not ideal.

Method used

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  • Preparation method of compound photocatalyst
  • Preparation method of compound photocatalyst
  • Preparation method of compound photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] a g-C 3 N 4 / Fe 2 o 3 / montmorillonite composite photocatalyst, which is prepared by the following steps:

[0028] (1) Mix melamine 10g with H 2 O (30ml) stirring and dispersing, low speed (300r / min), add 2g ferric chloride powder in the mixture, after stirring for 20min, under the condition of high-speed stirring (800r / min), dropwise add the ammoniacal liquor that massfraction is 22wt%, drop Add until the solution pH=9.

[0029](2) Add 1g of high-purity montmorillonite (91%) high-speed stirring (800r / min) for 30min to the mixed solution of step 1), and let it stand for 5min, then the mixed solution is suction-filtered, washed to pH=7, and then Move to drying in oven, and drying temperature is controlled at 80 ℃.

[0030] (3) the melamine / Fe(OH) obtained in step 2) 3 / montmorillonite mixture (6g) is packed in the porcelain boat, spreads evenly, puts into the nitrogen stove, under N 2 Calcination under atmosphere at 500°C for 2 hours, heating rate 2°C / min, to pre...

Embodiment 2

[0032] (1) Mix melamine 10g with H 2 O (40ml) stirring dispersion, low speed (400r / min), add 2.5g ferric chloride powder in the mixture, after stirring 22min, under the condition of high-speed stirring (900r / min), drip the ammoniacal liquor that massfraction is 23wt%, Add dropwise until the solution pH=9.

[0033] (2) Add 1.5g high-purity montmorillonite (92%) high-speed stirring (900r / min) for 35min to the mixed solution of step 1), let stand for 8min, then the mixed solution is suction filtered, washed to pH=8, and then It was moved to an oven for drying, and the drying temperature was controlled at 90°C.

[0034] (3) the melamine / Fe(OH) obtained in step 2) 3 / montmorillonite mixture (7g) is packed in the porcelain boat, spreads evenly, puts into the nitrogen stove, under N 2 Calcination under atmosphere at 500°C for 2 hours, heating rate 3°C / min, to prepare graphite phase carbon nitride g-C 3 N 4 / Fe 2 o 3 / Montmorillonite photocatalyst.

Embodiment 3

[0036] (1) Mix melamine 10g with H 2 O (50ml) stirring and dispersing, low speed (500r / min), add 3g ferric chloride powder in the mixture, after stirring for 25min, under the condition of high-speed stirring (1000r / min), dropwise add the ammoniacal liquor that massfraction is 25wt%, drop Add until the solution pH=10.

[0037] (2) Add 2g high-purity montmorillonite (95%) high-speed stirring (1000r / min) for 40min to the mixed solution of step 1), let stand for 10min, then the mixed solution is suction filtered, washed to pH=8, and then Move to drying in oven, and drying temperature is controlled at 95 ℃.

[0038] (3) the melamine / Fe(OH) obtained in step 2) 3 / montmorillonite mixture (15g) is packed in the porcelain boat, spreads evenly, puts into the nitrogen stove, under N 2 Calcination under atmosphere at 500°C for 2 hours with a heating rate of 5°C / min to prepare graphite phase carbon nitride g-C 3 N 4 / Fe 2 o 3 / Montmorillonite photocatalyst.

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Abstract

The invention discloses a preparation method of a compound photocatalyst. The preparation method comprises steps as follows: mixing melamine and H2O, adding ferric chloride powder to the mixture, mixing the mixture, and dropwise adding ammonia water under the high-speed stirring condition until the pH of the solution ranges from 9 to 10 to obtain a mixed solution; adding high-purity montmorillonite to the mixed solution, performing high-speed stirring, standing and suction filtration, washing filter cakes until the pH ranges from 7 to 8, and drying the filter cakes at the temperature of 80-95 DEG C to obtain a melamine / Fe(OH)3 / montmorillonite mixture; calcining the obtained mixture at the N2 atmosphere to obtain the graphite phase carbon nitride g-C3N4 / Fe2O3 / montmorillonite photocatalyst. On the premise that Fe2O3 and g-C3N4 form a P-N heterojunction to enhance the visible light catalysis efficiency, inorganic montmorillonite nanosheets are added to compound graphite phase carbon nitride to enhance the adsorbability of the photocatalyst, and the catalytic efficiency of the photocatalyst is improved.

Description

technical field [0001] The invention belongs to the field of environmental treatment and relates to a preparation method of a composite photocatalyst. Background technique [0002] The photocatalytic degradation technology driven by solar energy has the characteristics of making full use of clean and renewable energy, and has unique advantages and good application prospects in the field of environmental pollution prevention and control. In the photocatalytic process, photocatalysts can oxidize and decompose refractory organic pollutants until H 2 O.CO 2 And inorganic salts, etc., to partially or completely mineralize (mineralize) organic matter, so as to meet the requirements of harmless treatment of pollutants. At present, common photocatalysts can be roughly divided into three categories: metal oxides, sulfides (such as TiO 2 , ZnO, CdS, etc.); noble metal semiconductors (such as Bi 2 MoO 6 , BiOBr, Ag 3 PO 4 etc.); non-metallic semiconductors (such as g-C 3 N 4 ,...

Claims

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Application Information

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IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/39
Inventor 胡勇平徐传云许凤林王洪权梅娟师宾
Owner ZHEJIANG INST OF GEOLOGY & MINERAL RESOURCE
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