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Fe2O3/Ag3VO4 composite photocatalyst and preparation method thereof

A composite light and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of poor stability, low degradation efficiency of organic dyes, and visible light utilization. It is not a problem such as low cost, the method is simple and easy to implement, and the absorption characteristics are improved.

Active Publication Date: 2015-12-23
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-cost, high-efficiency Fe 2 o 3 / Ag 3 VO 4 The composite visible light photocatalytic material and its preparation method control the size of silver vanadate particles through temperature regulation, and solve the problems of low utilization rate of visible light, poor stability, and low degradation efficiency of organic dyes in existing catalysts.

Method used

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  • Fe2O3/Ag3VO4 composite photocatalyst and preparation method thereof
  • Fe2O3/Ag3VO4 composite photocatalyst and preparation method thereof
  • Fe2O3/Ag3VO4 composite photocatalyst and preparation method thereof

Examples

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Embodiment 1

[0028] The iron oxide used was prepared by the following method: Synthesis of nano-particle Fe by hydrothermal method and calcination method 2 o 3 , weighed 8.08gFe(NO 3 ) 3 9H 2 O was placed in a beaker, 80 mL of ethylene glycol (EG) was added and stirred until the nitrate was completely dissolved. Then weigh 7.20gCH 3 COONa and 2g PEG-600 were added to the above solution, and magnetically stirred for 1.5h until a uniform suspension was formed. Then these suspensions were divided into 25mL high-temperature stainless steel reaction kettles, and placed in an oven and heated to 200°C for 22 hours. After the reaction kettle was cooled, the obtained solids were taken out, washed 10 times with water, and washed 10 times with ethanol. Dry in a 60°C oven. Then grind the obtained solid and put it into a crucible, put it in a muffle furnace and heat it up to 500°C for calcination for 2 hours to obtain Fe. 2 o 3 sample. The iron oxides used in Examples 2-5 were all prepared by ...

Embodiment 2

[0037] Put 0.0010g of iron oxide in 40mL of distilled water for ultrasonic dispersion for 10min, and stir in an ice-water bath (0°C) to obtain dispersion A of iron oxide; disperse 0.24g of silver nitrate in the above dispersion to obtain dissolved silver nitrate Iron oxide mixed solution B; at the same time, in an ice water (0°C) bath, dissolve 0.1884g sodium vanadate dodecahydrate in 40mL distilled water to obtain solution C; The prepared C solution was added dropwise to the B solution, and continued to stir in an ice-water bath (0°C) for 120 min; the obtained product was washed and dried to obtain the composite photocatalyst. The material can degrade 90.0% of rhodamine B in 60 minutes under visible light irradiation.

Embodiment 3

[0039] Put 0.0018g of iron oxide in 40mL of distilled water for ultrasonic dispersion for 40min, and stir in 40mL of 30°C constant temperature distilled water to obtain the dispersion A of iron oxide; disperse 0.24g of silver nitrate in the above dispersion to obtain the oxidation Iron mixed solution B; at the same time, under the condition of 30℃ constant temperature water bath, dissolve 0.1900g of sodium vanadate dodecahydrate in 40mL of 30℃ constant temperature water bath to obtain solution C; under the condition of uniform stirring in 30℃ constant temperature water bath, the prepared Add solution C to solution B dropwise, and continue to stir in a constant temperature water bath at 30°C for 120 minutes; wash and dry the obtained product to obtain the composite photocatalyst, which can degrade 88.0% of rhodamine B in 60 minutes.

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Abstract

The invention provides a Fe2O3 / Ag3VO4 composite photocatalyst and a preparation method thereof. Iron oxide is put into distilled water to be subjected to ultrasonic dispersion and is stirred in a constant-temperature water bath to obtain iron oxide dispersion liquid A; silver nitrate dissolves in the dispersion liquid A to obtain mixed liquid B; sodium orthovanadate dodecahydrate dissolves in the constant-temperature water bath through stirring to obtain a solution C; the solution C is dropwise added into the mixed liquid B in the constant-temperature water bath under the even-stirring condition, and mixed liquid D is obtained after dripped adding is completed and performs constant-temperature reaction under the stirring condition; an obtained solid product is washed and dried after reaction to obtain the composite photocatalyst. The composite photocatalyst preparation can be performed at more moderate temperature, and the preparation method has the advantages of saving energy and reducing consumption. A silver vanadate photocatalyst is modified by utilizing Fe2O3, the visible light absorption characteristic of silver vanadate is improved, and the rhodamin B degradation rate under visible light exposure for 60 minutes can be up to 96.1%.

Description

technical field [0001] The invention relates to a photocatalytic material, in particular to a visible light-responsive Fe 2 o 3 / Ag 3 VO 4 Composite visible light photocatalyst and preparation method thereof, belonging to the technical field of photocatalysis in composite materials and environmental treatment Background technique [0002] In recent years, the problem of continuous environmental pollution has become increasingly prominent, which has aroused people's concerns about the global crisis. Photocatalytic technology is widely concerned as an environmentally friendly and low-cost environmental treatment technology. Therefore, the design and development of high-performance visible light-responsive Photocatalytic materials are of great significance and have become the direction of photocatalyst development. [0003] Silver vanadate is a new type of visible light-responsive photocatalyst, which has excellent photocatalytic performance and can degrade organic pollutan...

Claims

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Application Information

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IPC IPC(8): B01J23/89C02F1/30
Inventor 徐远国景立权谢萌李宏平许晖李华明黄立英
Owner JIANGSU UNIV
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