ZnO/In2O3 heterogeneous II-type photocatalytic material with hollow core-shell structure and preparation method thereof

Abstract

The invention discloses a ZnO / In2O3 heterogeneous II type photocatalytic material with a hollow core-shell structure and a preparation method thereof. The preparation method comprises the following steps: step 1, dissolving zinc salt and indium salt into a mixed solution of water, ethylene glycol and polyethylene glycol; 2, adding urea and sodium citrate into the solution obtained in the step 1 while stirring to obtain a reaction system mixed solution; 3, transferring the reaction system mixed solution obtained in the step 2 to a high-pressure reaction kettle for hydrothermal reaction; and 4,cooling the hydrothermal reaction product obtained in the step 3 to the room temperature, performing centrifuging, washing, drying and calcining to obtain the ZnO / In2O3 heterogeneous II type photocatalytic material with the hollow core-shell structure. According to the method, the hollow shell-core structure and the heterogeneous II-type photocatalytic material are constructed at the same time through a simple one-step hydrothermal method, and the nanoparticles prepared through the method are small in particle size and can effectively inhibit in-vivo recombination of carriers, so that the photocatalytic efficiency is improved.

Description

technical field

[0001] The invention relates to the technical field of preparation of photocatalytic materials, in particular to a hollow core-shell structure ZnO / In 2 o 3 Heterogeneous type II photocatalytic material and its preparation method. Background technique

[0002] The rapid development of industry has led to a serious increase in environmental pollution, among which organic pollutants are one of the main sources of pollution. These photocatalytic oxidation technologies for organic dye wastewater have attracted attention in recent years due to their high efficiency and low cost. ZnO has a high light absorption coefficient, fast hole transport, and underwater stability, so it has a wide energy band gap that only limits light absorption to the UV region, so it is widely used. In order to improve the photocatalytic efficiency of ZnO, it is particularly important to suppress carrier recombination and improve light utilization.

[0003] In recent years, hollow-shell...

Examples

Embodiment example 1

[0039] Implementation Case 1: A Hollow Core-Shell Structure ZnO / In 2 o 3 Preparation method of heterogeneous type Ⅱ photocatalytic material

[0040] Weigh 0.59g of zinc nitrate, 0.38g of indium nitrate and stir to dissolve in a mixed solution containing 20mL of ethylene glycol, 20mL of polyethylene glycol and 10mL of distilled water, add 0.8g of sodium citrate, 1.5g of Stir the urea for 3 hours, transfer the stirred mixed solution to a high-pressure reactor, heat it at 200°C for 12 hours, take the product after the hydrothermal reaction and centrifuge it at 8,000 rpm for 8 minutes, wash the centrifugate three times with distilled water, wash it twice with ethanol, and then dry it at 60°C After 600 min, the dried sample was calcined in a tube furnace at 500°C for 180 min.

Embodiment example 2

[0042] Weigh 0.59g of zinc nitrate, 0.38g of indium nitrate and stir to dissolve in a mixed solution containing 20mL of ethylene glycol, 20mL of polyethylene glycol and 10mL of distilled water, add 0.9g of sodium citrate, 1.5g Stir the urea for 3 hours, transfer the stirred mixed solution to a high-pressure reactor, heat it at 200°C for 12 hours, take the product after the hydrothermal reaction and centrifuge it at 8,000 rpm for 8 minutes, wash the centrifugate three times with distilled water, wash it twice with ethanol, and then dry it at 60°C After 600 min, the dried sample was calcined in a tube furnace at 500°C for 180 min.

Embodiment example 3

[0044]Weigh 0.59g of zinc nitrate and 0.38g of indium nitrate and stir and dissolve them in a mixed solution containing 20mL of ethylene glycol, 20mL of polyethylene glycol and 10mL of distilled water. Add 1.0g of sodium citrate, 1.5g of Stir the urea for 3 hours, transfer the stirred mixed solution to a high-pressure reactor, heat it at 200°C for 12 hours, take the product after the hydrothermal reaction and centrifuge it at 8,000 rpm for 8 minutes, wash the centrifugate three times with distilled water, wash it twice with ethanol, and then dry it at 60°C After 600 min, the dried sample was calcined in a tube furnace at 500°C for 180 min.

technical field

[0001] The invention relates to the technical field of preparation of photocatalytic materials, in particular to a hollow core-shell structure ZnO / In 2 o 3 Heterogeneous type II photocatalytic material and its preparation method. Background technique

[0002] The rapid development of industry has led to a serious increase in environmental pollution, among which organic pollutants are one of the main sources of pollution. These photocatalytic oxidation technologies for organic dye wastewater have attracted attention in recent years due to their high efficiency and low cost. ZnO has a high light absorption coefficient, fast hole transport, and underwater stability, so it has a wide energy band gap that only limits light absorption to the UV region, so it is widely used. In order to improve the photocatalytic efficiency of ZnO, it is particularly important to suppress carrier recombination and improve light utilization.

[0003] In recent years, hollow-shell...

Examples

Embodiment example 1

[0039] Implementation Case 1: A Hollow Core-Shell Structure ZnO / In 2 o 3 Preparation method of heterogeneous type Ⅱ photocatalytic material

[0040] Weigh 0.59g of zinc nitrate, 0.38g of indium nitrate and stir to dissolve in a mixed solution containing 20mL of ethylene glycol, 20mL of polyethylene glycol and 10mL of distilled water, add 0.8g of sodium citrate, 1.5g of Stir the urea for 3 hours, transfer the stirred mixed solution to a high-pressure reactor, heat it at 200°C for 12 hours, take the product after the hydrothermal reaction and centrifuge it at 8,000 rpm for 8 minutes, wash the centrifugate three times with distilled water, wash it twice with ethanol, and then dry it at 60°C After 600 min, the dried sample was calcined in a tube furnace at 500°C for 180 min.

Embodiment example 2

[0042] Weigh 0.59g of zinc nitrate, 0.38g of indium nitrate and stir to dissolve in a mixed solution containing 20mL of ethylene glycol, 20mL of polyethylene glycol and 10mL of distilled water, add 0.9g of sodium citrate, 1.5g Stir the urea for 3 hours, transfer the stirred mixed solution to a high-pressure reactor, heat it at 200°C for 12 hours, take the product after the hydrothermal reaction and centrifuge it at 8,000 rpm for 8 minutes, wash the centrifugate three times with distilled water, wash it twice with ethanol, and then dry it at 60°C After 600 min, the dried sample was calcined in a tube furnace at 500°C for 180 min.

Embodiment example 3

[0044]Weigh 0.59g of zinc nitrate and 0.38g of indium nitrate and stir and dissolve them in a mixed solution containing 20mL of ethylene glycol, 20mL of polyethylene glycol and 10mL of distilled water. Add 1.0g of sodium citrate, 1.5g of Stir the urea for 3 hours, transfer the stirred mixed solution to a high-pressure reactor, heat it at 200°C for 12 hours, take the product after the hydrothermal reaction and centrifuge it at 8,000 rpm for 8 minutes, wash the centrifugate three times with distilled water, wash it twice with ethanol, and then dry it at 60°C After 600 min, the dried sample was calcined in a tube furnace at 500°C for 180 min.

Images