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Perovskite oxide doped TiO2 photocatalyst and preparation method thereof

A technology of perovskite oxide and photocatalyst, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of unfavorable promotion, high cost, and restricting the development of TiO2, and achieve good results. Application prospect, cost reduction effect

Inactive Publication Date: 2017-06-27
ZHEJIANG SHUREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its wide bandgap and low quantum yield, which work well under ultraviolet radiation but poorly under solar radiation, limit the potential of TiO 2 development of
[0005] perovskite composite oxides (ABO 3 ) has attracted more and more attention for its superiority in photocatalysis. Due to its narrow band gap, it can absorb visible light and undergo electronic transition, showing good photocatalytic activity. It can be used for photocatalytic degradation of organic matter. In the presence of photocatalyst Under this condition, when the light of appropriate wavelength irradiates the suspension of water-soluble dyes, electron-hole pairs will be generated on the surface of the catalyst, and the holes will further interact with water to generate highly active hydroxyl radicals OH·, which will interact with the dyes adsorbed on the surface of the catalyst. Molecules undergo oxidation-reduction reactions to degrade them into small inorganic molecules. However, perovskite oxides have the disadvantage of high cost, which is not conducive to popularization.

Method used

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  • Perovskite oxide doped TiO2 photocatalyst and preparation method thereof
  • Perovskite oxide doped TiO2 photocatalyst and preparation method thereof
  • Perovskite oxide doped TiO2 photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

specific Embodiment 1

[0035] 1.3g of BaFe that has been ground 0.5 co 0.5 o 3-δ Put it into a 100mL beaker, add 40mL of absolute ethanol, and ultrasonically stir for 30min to obtain a suspension; 0.7g of anatase TiO 2 Add the hydrothermal particles to the suspension and mix thoroughly until it is homogenous, anatase TiO 2 Hydrothermal particles, the suspension and anatase TiO were evaporated to dryness in a water bath at 70 °C 2 The mixture of hydrothermal particles was ground into particles, put into a muffle furnace, and calcined at 650°C for 8 hours. After grinding, the target product was obtained, and the perovskite doping ratio of the target product was 65%.

specific Embodiment 2

[0037] 1.5g of Ba that has been ground x Sr 1-x Fe 0.5 co 0.5 o 3-δ (x=0, 0.5, 1) into a 100mL beaker, add 40mL of absolute ethanol, and ultrasonically stir for 30min to obtain a suspension; 0.5g of anatase TiO 2 Add the hydrothermal particles to the suspension and mix thoroughly until it is homogenous, anatase TiO 2 Hydrothermal particles, the suspension and anatase TiO were evaporated to dryness in a water bath at 70 °C 2 The mixture of hydrothermal particles was ground into particles, put into a muffle furnace, and calcined at 650°C for 8 hours. After grinding, the target product was obtained, and the perovskite doping ratio of the target product was 75%.

specific Embodiment 3

[0039] 1.0g of Ba that has been ground x Sr 1-x Fe 0.5 co 0.5 o 2 (x=0, 0.5, 1) was put into a 100mL beaker, 40mL of absolute ethanol was added, and ultrasonically stirred for 30min to obtain a suspension; 1.0g of anatase TiO 2 Add the hydrothermal particles to the suspension and mix thoroughly until it is homogenous, anatase TiO 2 Hydrothermal particles, the suspension and anatase TiO were evaporated to dryness in a water bath at 70 °C 2 The mixture of hydrothermal particles was ground into particles, put into a muffle furnace, and calcined at 650°C for 8 hours. After grinding, the target product was obtained, and the perovskite doping ratio of the target product was 50%.

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Abstract

The invention relates to a photocatalyst for organic dye wastewater treatment in the textile printing and dyeing industry, in particular to a perovskite oxide doped TiO2 photocatalyst. The photocatalyst is BaxSr1-xFe0.5 Co0.5O3-delta / TiO2, x = 0-1, delta = 0-3, and the perovskite doping ratio is 35%-90%. The catalyst is doped with low-price TiO2, and the cost is greatly reduced compared with a singly adopted perovskite compound oxide. In addition, the compound catalyst of perovskite oxide and TiO2 conducts photocatalysis on absorption wavelength red shift, can achieve low-cost and high-efficiency degradation of dyes and other organic compounds under normal-temperature sunlight and has a very good application prospect.

Description

technical field [0001] The invention relates to a photocatalyst used for the treatment of industrial organic dye wastewater in the textile printing and dyeing industry, in particular to a perovskite oxide doped TiO 2 catalyst of light. Background technique [0002] my country is a big producer of dyestuffs. The annual output of various dyestuffs has reached 900,000 tons, and the output of dyestuffs has accounted for about 60% of the world's total output. The textile printing and dyeing industry has a large amount of industrial wastewater and is difficult to treat. According to incomplete statistics, the daily discharge of printing and dyeing wastewater in my country is 3×10 6 -4×10 6 m 3 , accounting for 35% of the total industrial wastewater discharge. Dye wastewater from the dye industry and textile industry has become an important source of environmental pollution. These discharges contain residual dyes that affect water quality and threaten public health. Some azo...

Claims

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Application Information

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IPC IPC(8): B01J23/78C02F1/30C02F1/72C02F101/30C02F103/30
CPCC02F1/30C02F1/725B01J23/002B01J23/78C02F2103/30C02F2305/023C02F2305/10C02F2101/308B01J2523/00B01J35/39B01J2523/24B01J2523/47B01J2523/842B01J2523/845B01J2523/25Y02W10/37
Inventor 黄向红高芊卉乔军张里峰方志宾胡成琪孟红燕童均俞许文磊
Owner ZHEJIANG SHUREN UNIV