Heterojunction type ternary composite semiconductor photocatalyst and preparation method thereof

A ternary composite and photocatalyst technology, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve a wide range of problems, achieve simple preparation process, improve Effect of Quantum Efficiency, Good Dye Degradability

Inactive Publication Date: 2015-08-19
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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  • Heterojunction type ternary composite semiconductor photocatalyst and preparation method thereof
  • Heterojunction type ternary composite semiconductor photocatalyst and preparation method thereof
  • Heterojunction type ternary composite semiconductor photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

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 is dissolved in 30mL deionized water to make a solution, the concentration of the mixed metal salt solution is 0.2M; weigh 0.48g NaOH and 0.53g Na 2 CO 3 Dissolve in 50mL deionized water to make a mixed solution, the concentration is [NaOH] = 1.6 [Zn 2+ ], [Na 2 CO 3 ]=2([In 3+ ]+[Fe 3+ ]). The mixed metal salt solution and mixed alkali solution were placed in two constant pressure dropping funnels, and the temperature of the water bath was 35℃. While stirring, the solution was dropped into the four-necked flask, and the dropping rate was adjusted to keep the pH at 9.5~10. Within range. Then it was crystallized at a constant temperature in a water bath at 65°C for 24 hours. After the reaction, the reaction product was washed with deionized water by centrifugation (3500r / min) to neutrality, and the resulting slurry was dried at 60°C overnight, ground with a mortar, and calcined ...

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 is dissolved in 30mL deionized water to make a solution, the concentration of the mixed metal salt solution is 0.2M; weigh 0.48g NaOH and 0.53g Na 2 CO 3 Dissolve in 50mL deionized water to make a mixed solution, the concentration is [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. The catalytic degradation rate of methylene blue reached 88.5% after 2h exposure under visible light, and the reaction rate constant was 17.9×10 -3 min -1 , Is Zn 3 2.38 times 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 is dissolved in 30mL deionized water to make a solution, the concentration of the mixed metal salt solution is 0.2M; weigh 0.48g NaOH and 0.53g Na 2 CO 3 Dissolve in 50mL deionized water to make a mixed solution, the concentration is [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. The catalytic degradation rate of methylene blue reached 82.3% after 2h exposure under visible light, and the reaction rate constant was 14.3×10 -3 min -1 , Is Zn 3 Fe-binary composite oxide material 1.90 times.

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Abstract

The invention discloses a heterojunction type ternary composite semiconductor photocatalyst and a preparation method thereof. A constant-pH coprecipitation method is adopted to prepare ternary layered double hydroxides as a precursor, and finally a ternary heterojunction composite semiconductor is obtained by high-temperature roasting. The preparation technology is simple and convenient, the obtained material is provided with a proper energy band structure, current carrier separation and migration rates can be effectively improved, visible light is efficiently used, the relative amount of metal ions is selectively regulated and controlled to prepare a series of ternary heterojunction composite semiconductors, a high-activity photocatalyst is screened out, and good dye degradation ability is shown under the visible light. A visible light catalytic degradation reaction rate constant of the ternary heterojunction composite semiconductor to methylene blue is 1.6 to 4.1 times of that of a binary composite semiconductor, and the ternary heterojunction composite semiconductor has higher catalytic activity and good universality in the aspect of dye degradation 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, and is applied to a visible light catalytic degradation reaction of organic dyes. Background technique [0002] Photocatalytic technology has received extensive attention in the field of solar energy conversion and environmental purification. Expanding the spectral response range and improving the photocatalytic quantum efficiency of catalysts are hot topics in the field of photocatalytic chemistry. As we all know, TiO 2 ZnO and ZnO are the most commonly used semiconductor photocatalysts. However, these two wide band gap semiconductors have disadvantages such as low quantum efficiency and ineffective use of visible light, which limit their application in the field of environmental pollution control. Therefore, des...

Claims

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Application Information

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Patent Type & Authority Applications(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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