Perovskite type photocatalyst with double modification of doping and loading, and preparation method thereof

A perovskite-type, double-modified technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve low solar energy utilization, low quantum yield, hindering applications, etc. problems, to achieve the effect of facilitating electron transfer, simple process, and promoting degradation

Inactive Publication Date: 2017-05-31
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Perovskite has a small band gap (about 2.6eV), but still has technical problems such as low quantum yield (about 4%), low solar energy utilization rate, and difficult loading, which hinder its wide application in industry.

Method used

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  • Perovskite type photocatalyst with double modification of doping and loading, and preparation method thereof
  • Perovskite type photocatalyst with double modification of doping and loading, and preparation method thereof
  • Perovskite type photocatalyst with double modification of doping and loading, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The present invention LaCo 0.9 Mg 0.1 o 3 -The preparation method of MgO-Ag perovskite type visible light catalyst, comprises the steps:

[0032] Step 1, weigh the corresponding amount of La(NO 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and Mg(NO 3 ) 2 ·6H 2 O, then weigh the corresponding amount of citric acid according to the molar ratio of metal cation and citric acid as 1:1, and the above corresponding amount of La(NO 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2O and citric acid are dissolved together in deionized water and fully dissolved to obtain a mixed solution. Add ammonia (30wt%) dropwise to the mixed solution while magnetically stirring until the pH of the mixed solution is 8, and continue to magnetically stir the mixed solution in a water bath at 80°C. The mixed solution was solified for 3 hours, and the solified mixed solution was placed at 110°C for 12 hours to become gelled, and then placed at 400°C and 750°C for 4 hours in an air atm...

Embodiment 2

[0039] The present invention LaCo 0.9 Mg 0.1 o 3 -The preparation method of MgO-Ag perovskite type visible light catalyst, comprises the steps:

[0040] Step 1, weigh the corresponding amount of La(NO 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and Mg(NO 3 ) 2 ·6H 2 O, then weigh the corresponding amount of citric acid according to the molar ratio of metal cation and citric acid as 1:1, and the above corresponding amount of La(NO 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O and citric acid are dissolved together in deionized water and fully dissolved to obtain a mixed solution. Add ammonia (30wt%) dropwise to the mixed solution while magnetically stirring until the pH of the mixed solution is 8, and continue to magnetically stir the mixed solution in a water bath at 80°C. 3h to fully sol the mixed solution, put the solified mixed solution at 110°C for 12h to become gelatinized, then put it at 400°C and 750°C, and roast in air atmosphere for 4h to remove or...

Embodiment 3

[0047] The present invention LaCo 0.9 Mg 0.1 o 3 -The preparation method of MgO-Ag perovskite type visible light catalyst, comprises the steps:

[0048] Step 1, weigh the corresponding amount of La(NO 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O and Mg(NO 3 ) 2 ·6H 2 O, then weigh the corresponding amount of citric acid according to the molar ratio of metal cation and citric acid as 1:1, and the above corresponding amount of La(NO 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O and citric acid are dissolved together in deionized water and fully dissolved to obtain a mixed solution. Add ammonia (30wt%) dropwise to the mixed solution while magnetically stirring until the pH of the mixed solution is 8, and continue to magnetically stir the mixed solution in a water bath at 80°C. 3h to fully sol the mixed solution, put the solified mixed solution at 110°C for 12h to become gelatinized, then put it at 400°C and 750°C, and roast in air atmosphere for 4h to remove or...

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Abstract

The invention discloses a perovskite type photocatalyst with double modification of doping and loading. The catalyst combines double advantages of synchronous doping and loading and collaborative loading so as to have a high visible-light response capability. The invention also discloses a preparation method of the perovskite type photocatalyst with the double modification of doping and loading. The preparation method comprises the steps of firstly utilizing an improved sol-gel method to synchronously realize synchronous modification of Mg on inside and outside of a LaCoO3 crystal lattice, and further utilizing a photo-reduction method for reducing and loading Ag to the surface of the catalyst. According to the catalyst loaded with the Ag, on one hand, due to a surface plasmon resonance effect of an embedded Ag nanometer particle, a local electric field is enhanced, and an electron transfer phenomenon is facilitated, so that a response capability of the catalyst on visible light is improved; on the other hand, due to collaborative loading of the Ag and MgO, the transition transfer of catalyst surface electron is facilitated, so that dye degradation is jointly promoted.

Description

technical field [0001] The present invention relates to a LaCo 0.9 Mg 0.1 o 3 - MgO-Ag perovskite-type visible light catalysts, also involving the aforementioned LaCo 0.9 Mg 0.1 o 3 The invention discloses a preparation method of an MgO-Ag perovskite type visible light catalyst, which belongs to the technical field of photocatalysts. Background technique [0002] Environmental pollution restricts the sustainable development of human society. Dye wastewater is one of the main causes of water pollution in the environment. Dye wastewater mainly comes from the textile and paper industry, and has the characteristics of high chroma, large changes in acidity and alkalinity, high organic content, and toxicity. 60% to 70% of the dyes are azo dyes, which will increase the toxic carcinogens in the water and endanger human health. Common treatment methods for dye wastewater mainly include flocculation, coagulation, adsorption, membrane filtration, chemical oxidation, and biologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C02F1/30C02F101/30C02F103/30C02F103/28
CPCY02W10/37B01J23/002B01J23/894B01J35/004B01J2523/00C02F1/30C02F2101/308C02F2103/28C02F2103/30B01J2523/22B01J2523/3706B01J2523/47B01J2523/845
Inventor 杨汉培孙慧华朱鸿宇聂坤崔素珍郭润强高照毛静涛
Owner HOHAI UNIV
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