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Ternary composite visible light photocatalyst, preparation method and application thereof

A ternary compound and ternary compound technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of long photocatalytic degradation of pollutants, limited improvement, and poor reuse effect. And other issues

Active Publication Date: 2017-04-19
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because it is slightly soluble in water, it is prone to photocorrosion-self-decomposition under light conditions, which greatly limits its application.
Although there are many studies on the inhibition of Ag 3 PO 4 Reports on photoetching methods, e.g., Ag 3 PO 4 Composite with other semiconductors, Ag 3 PO 4 Compounding with carbon-based materials, especially compounding with graphene, etc., but the improvements brought by these methods are very limited; the required photocatalytic degradation of pollutants takes a long time, and in addition, these photocatalysts still exist The problem of poor reuse effect

Method used

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  • Ternary composite visible light photocatalyst, preparation method and application thereof
  • Ternary composite visible light photocatalyst, preparation method and application thereof
  • Ternary composite visible light photocatalyst, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: the preparation of graphene oxide

[0028] First take 50mL of concentrated H 2 SO 4 in a 500mL beaker, then put it into a water bath, add ice-water mixture to the water bath and add 1g NaNO to the beaker 3 , when the reaction liquid is cooled to 0°C, slowly add 2g of natural graphite powder, at this time, keep the temperature of the reaction system not higher than 5°C, and fully stir for 30min. Then add 0.3g KMnO 4 , fully stirred for 30min, kept the temperature of the reaction system not higher than 10°C, weighed 7g KMnO 4 Divide into 3 equal portions, add in portions within 1 hour, and keep the reaction temperature not higher than 20°C. Remove the ice bath, change to a water bath, raise the reaction temperature to about 35°C, and stir thoroughly for 2 hours to obtain a brown suspension. Slowly add 45ml of water into the suspension, at this time, control the rate of addition to keep the temperature at about 90°C, and react at this temperature for 15m...

Embodiment 2

[0029] Example 2: Ag 3 PO 4 preparation

[0030] First prepare 50ml, 0.6M AgNO 3 solution, kept stirring, and then dropwise added 50ml, 0.2M, Na 2 HPO 4 solution, stirred for 2h, and the precipitate was washed and dried to obtain Ag 3 PO 4 yellow powder.

Embodiment 3

[0031] Example 3: SrTiO 3 preparation of

[0032] Dissolve 2.1g of isopropyl titanate and 1.55g of strontium acetate hemihydrate in 50ml of ethylene glycol, and put it in an oil bath at 180 degrees until it forms a dry gel, then add 5M NaOH to disperse and dissolve, and finally put the dispersion into the reaction kettle to keep 180 degrees, 36h. Finally wash and dry to get SrTiO 3 .

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Abstract

The invention discloses a ternary composite visible light photocatalyst, a preparation method and application thereof. The catalyst is an Ag3PO4 / reduced graphene oxide / La and Cr-doped SiTiO3 ternary compound. Ag3PO4 is coated by the reduced graphene oxide; and La and Cr-doped SrTiO3 particles are distributed outside the reduced graphene oxide. The photocatalyst prepared by invention is high in catalytic activity and strong in stability, has ultrahigh degradation efficiency for dyes such as rhodamine B, and can carry out efficient degradation directly under natural light.

Description

technical field [0001] The invention relates to a composite visible light catalyst for efficiently degrading dye pollutants, a preparation method and application thereof. Background technique [0002] With the development of the economy, a large amount of industrial wastewater such as dye synthesis and printing and dyeing has been discharged into the environment. The dye has caused serious pollution and damage, threatening human health and life. According to statistics, about 15% of dyes in the world are discharged into wastewater during the production process, and are transformed into toxic by-products through a series of chemical and physical processes in the environment. At present, some conventional physical and chemical treatment technologies cannot completely cure it. Therefore, it is imperative to develop a green, simple, effective and energy-saving treatment method. [0003] Photocatalytic technology is a green and efficient oxidation technology. The principle is ...

Claims

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Application Information

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IPC IPC(8): B01J27/188C02F1/30C02F1/72C02F101/34C02F101/38
CPCC02F1/30C02F1/725B01J27/188C02F2101/38C02F2101/34C02F2101/308C02F2305/023C02F2305/10B01J35/39Y02W10/37
Inventor 刘玉堂蔡涛张书渠刘承斌王龙禄
Owner HUNAN UNIV
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