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Preparation method and application of a decatungstate/carbon nitride composite photocatalyst

A technology of decapolytungstate and photocatalyst, which is applied in the field of photocatalysis and achieves the effects of simple preparation method, improved photocatalytic efficiency and favorable industrial production.

Active Publication Date: 2018-08-17
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently based on Na 4 W 10 o 32 with g-C 3 N 4 The construction of composite photocatalyst materials and their application in the photocatalytic degradation of environmental pollutants has not been reported yet

Method used

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  • Preparation method and application of a decatungstate/carbon nitride composite photocatalyst
  • Preparation method and application of a decatungstate/carbon nitride composite photocatalyst
  • Preparation method and application of a decatungstate/carbon nitride composite photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0024]Embodiment 1 The present invention consists of HW and g-C 3 N 4 Composition, the mass fraction of the HW is 5wt% ~ 20wt%, the g-C 3 N 4 The mass fraction of is 80wt%~95wt%, and its specific preparation method comprises the following steps:

[0025] (1) Add 0.01mol (3.3g) Na to a 250mL round bottom flask successively 2 WO 4 2H 2 O and 4mL H 2 O, boil for 5min, add 6.9mL 3M HCl, add 0.003mol (1.46g) CTAB dissolved in 4mL water / ethanol under constant stirring, keep the temperature at 100°C, reflux for 10min, wash with deionized water / ethanol after the reaction The product was dried at 50°C;

[0026] (2) Put melamine in a covered crucible, heat up to 550°C in a muffle furnace at a heating rate of 2.3°C / min, keep it for 4 hours, and the yellow powder obtained after natural cooling is the block g-C 3 N 4 ;

[0027] (3) HW and g-C obtained in steps (1), (2) 3 N 4 Disperse in 50mL methanol respectively, ultrasonication for 1h, mix the suspension with ultrasonication ...

Embodiment 2

[0031] Embodiment 2 prepares the mass fraction containing HW to be 5wt%HW / g-C 3 N 4 catalyst of light.

[0032] Follow the steps below:

[0033] (1) Add 0.01mol (3.3g) Na to a 250mL round bottom flask successively 2 WO 4 2H 2 O and 4mL H 2 O, boil for 5min, add 6.9mL 3M HCl, add 0.003mol (1.46g) CTAB dissolved in 4mL water / ethanol under constant stirring, keep the temperature at 100°C, reflux for 10min, wash with deionized water / ethanol after the reaction The product was dried at 50°C;

[0034] (2) Put melamine in a covered crucible, heat up to 550°C in a muffle furnace at a heating rate of 2.3°C / min, keep it for 4 hours, and the yellow powder obtained after natural cooling is the block g-C 3 N 4 ;

[0035] (3) 0.05g of HW and 0.95g of g-C obtained in steps (1) and (2) 3 N 4 Disperse in 50mL of methanol respectively, sonicate for 1h, mix and sonicate the suspension and put it in a fume hood to volatilize for 2h. After the methanol solution is evaporated to dryness,...

Embodiment 3

[0038] Example 3 Preparation of HW / g-C containing HW mass fraction of 20wt% 3 N 4 composite photocatalyst.

[0039] Follow the steps below:

[0040] (1) Add 0.01mol (3.3g) Na to a 250mL round bottom flask successively 2 WO 4 2H 2 O and 4mL H 2 O, boil for 5min, add 6.9mL 3M HCl, add 0.003mol (1.46g) CTAB dissolved in 4mL water / ethanol under constant stirring, keep the temperature at 100°C, reflux for 10min, wash with deionized water / ethanol after the reaction The product was dried at 50°C;

[0041] (2) Put melamine in a covered crucible, heat up to 550°C in a muffle furnace at a heating rate of 2.3°C / min, keep it for 4 hours, and the yellow powder obtained after natural cooling is the block g-C 3 N 4 ;

[0042] (3) 0.20g of HW and 0.80g of g-C obtained in steps (1) and (2) 3 N 4 Disperse in 50mL of methanol respectively, sonicate for 1h, mix and sonicate the suspension and put it in a fume hood to volatilize for 2h. After the methanol solution is evaporated to dryn...

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Abstract

The invention discloses a preparation method and application of decapolytungstate / carbon nitride composite photocatalyst, which is composed of decapolytungstate and g-C3N4. The mass fraction of decapolytungstate (HW) is 5wt%. ~20wt%, the mass fraction of g-C3N4 is 80wt% ~ 95wt%; compared with the existing technology, the present invention improves the light utilization efficiency, solves the water solubility defect of decapolytungstate, and improves g-C3N4 Low quantum efficiency and other defects, thereby improving photocatalytic efficiency. The preparation method is simple and low-cost, and is conducive to industrial production. Experiments have shown that the HW / g‑C3N4 composite photocatalyst prepared by the inventive method has efficient visible light catalytic degradation of pollutants in water, and the degradation rate is significantly higher than that of pure carbon nitride.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a preparation method and application of a decatungstate / carbon nitride composite photocatalyst. Background technique [0002] With the emergence of the energy crisis and the deterioration of the global environment, energy and the environment are major issues that human beings face in the 21st century and need to be resolved urgently. Solar energy is a kind of renewable energy, which has the advantages of inexhaustible, clean and pollution-free. As a "green" technology, photocatalytic technology can use sunlight as a light source. It can not only be used to deal with water pollution, but also can be used to deal with air pollution, soil pollution, sterilization and other aspects, showing extremely Broad application value (Chem.Rev.2014,114,9919-9986). [0003] In recent years, polyoxometalates (POM) have been used as a 2 Molecular materials with similar funct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30
CPCC02F1/30B01J27/24C02F2305/10C02F2101/308B01J35/39Y02W10/37
Inventor 包木太杨晓龙钱方方陆金仁李一鸣
Owner OCEAN UNIV OF CHINA
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