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A kind of heterojunction ternary composite semiconductor photocatalyst and preparation method thereof

A ternary composite and photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve a wide range of problems, and achieve simple and good preparation process The effect of dye degradation ability and good universality

Inactive Publication Date: 2017-12-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The construction of heterojunction ternary composite semiconductor photocatalysts is far less extensive than that of binary composites. The preparation of ZnO-based ternary composite semiconductor photocatalysts with dispersed heterostructures by the layered precursor calcination method has not been reported. Therefore, exploring new The preparation technology of the ternary oxide semiconductor photocatalyst has practical significance

Method used

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  • A kind of heterojunction ternary composite semiconductor photocatalyst and preparation method thereof
  • A kind of heterojunction ternary composite semiconductor photocatalyst and preparation method thereof
  • A kind of heterojunction ternary composite semiconductor photocatalyst and preparation method thereof

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Embodiment 1

[0021] Weigh 1.3387g Zn(NO 3 ) 2 ·6H 2 O, 0.1759g In(NO 3 ) 3 ·5H 2 O and 0.4242g Fe(NO 3 ) 3 9H 2 O was dissolved in 30mL deionized water to make a solution, the concentration of the mixed metal salt solution was 0.2M; weigh 0.48g NaOH and 0.53gNa 2 CO 3 Dissolve in 50mL deionized water to make a mixed solution, the concentrations are [NaOH]=1.6[Zn 2+ ], [Na 2 CO 3 ]=2([In 3 + ]+[Fe 3+ ]). The mixed metal salt solution and the mixed alkali solution were respectively placed in two constant-pressure dropping funnels, and the water bath temperature was 35°C. While stirring, the solution was added dropwise into the four-necked bottle, and the dropping rate was adjusted to keep the pH at 9.5-10. within range. Then it was crystallized at constant temperature in a water bath at 65°C for 24h. After the reaction, the reaction product was centrifuged with deionized water (3500r / min) and washed to neutrality, and the resulting slurry was dried overnight at 60°C, finely ...

Embodiment 2

[0024] Weigh 1.3387g Zn(NO 3 ) 2 ·6H 2 O, 0.2932g In(NO 3 ) 3 ·5H 2 O and 0.3030g Fe(NO 3 ) 3 9H 2 O was dissolved in 30mL deionized water to make a solution, the concentration of the mixed metal salt solution was 0.2M; weigh 0.48g NaOH and 0.53gNa 2CO 3 Dissolve in 50mL deionized water to make a mixed solution, the concentrations are [NaOH]=1.6[Zn 2+ ], [Na 2 CO 3 ]=2([In 3 + ]+[Fe 3+ ]). Prepared under the same conditions as in Example 1 [In 3+ ] / [M 3+ ]=0.5 / 0.5, [Zn 2+ ] / ([In 3+ ]+[M 3+ ]) = 3 / 1 Zn 3 In 0.5 Fe 0.5 - Ternary composite oxide materials. After 2 hours of irradiation under visible light, the catalytic degradation rate of methylene blue reached 88.5%, and the reaction rate constant was 17.9×10 -3 min -1 , is Zn 3 2.38 times that of Fe-binary composite oxide material.

Embodiment 3

[0026] Weigh 1.3387g Zn(NO 3 ) 2 ·6H 2 O, 0.4105g In(NO 3 ) 3 ·5H 2 O and 0.1818g Fe(NO 3 ) 3 9H 2 O was dissolved in 30mL deionized water to make a solution, and the concentration of the mixed metal salt solution was 0.2M; weigh 0.48gNaOH and 0.53gNaOH 2 CO 3 Dissolve in 50mL deionized water to make a mixed solution, the concentrations are [NaOH]=1.6[Zn 2+ ], [Na 2 CO 3 ]=2([In 3 + ]+[Fe 3+ ]). Prepared under the same conditions as in Example 1 [In 3+ ] / [M 3+ ]=0.7 / 0.3, [Zn 2+ ] / ([In 3+ ]+[M 3+ ]) = 3 / 1 Zn 3 In 0.7 Fe 0.3 - Ternary composite oxide materials. After 2 hours of irradiation under visible light, the catalytic degradation rate of methylene blue reached 82.3%, and the reaction rate constant was 14.3×10 -3 min -1 , is Zn 3 1.90 times that of Fe-binary composite oxide material.

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Abstract

The invention discloses a heterojunction type ternary composite semiconductor photocatalyst and a preparation method thereof. The invention adopts a constant pH co-precipitation method to prepare a ternary layered double metal hydroxide as a precursor, and finally obtains a ternary heterojunction compound semiconductor through high-temperature roasting. The preparation process of the present invention is simple, and the obtained material has an appropriate energy band structure, which can effectively improve the carrier separation and migration rate, efficiently utilize visible light, and prepare a series of ternary heterojunction compound semiconductors by selectively regulating the relative content of metal ions. A highly active photocatalyst exhibits good dye degradation ability under visible light. The visible light catalytic degradation reaction rate constant of the ternary heterojunction compound semiconductor to methylene blue is 1.6-4.1 times that of the binary compound semiconductor, which has high catalytic activity and good universality in the degradation of dyes under visible light.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalyst preparation, and in particular relates to a zinc oxide-based heterojunction ternary composite oxide semiconductor photocatalytic material and a preparation method thereof, which are applied to visible light catalytic degradation of organic dyes. Background technique [0002] Photocatalytic technology has received extensive attention in the fields of solar energy conversion and environmental purification. Extending the spectral response range and improving the photocatalytic quantum efficiency of catalysts are hot topics in the field of photocatalytic chemistry. It is well known that TiO 2 ZnO and ZnO are the most commonly used semiconductor photocatalysts. However, these two wide-bandgap semiconductors have disadvantages such as low quantum efficiency and inability to effectively use visible light, which limits their application in the field of environmental pollution control. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/825C02F1/30C02F101/30
Inventor 杨兰刘倩李峰范国利
Owner BEIJING UNIV OF CHEM TECH
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