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Ce-doped spherical zno photocatalyst applied to dye wastewater treatment and preparation method thereof

A photocatalyst and dye wastewater technology, applied in the field of materials, can solve the problems of high recombination rate of photogenerated electrons, limited ZnO photocatalytic performance, low utilization rate of visible light, etc., and achieve high photocatalytic efficiency, good crystallinity, and simple operation.

Active Publication Date: 2017-09-26
陕西华盈博越科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a photocatalyst, ZnO itself has some defects, such as low utilization rate of visible light and high recombination rate of photogenerated electrons, which limit the photocatalytic performance of ZnO to a certain extent.

Method used

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  • Ce-doped spherical zno photocatalyst applied to dye wastewater treatment and preparation method thereof
  • Ce-doped spherical zno photocatalyst applied to dye wastewater treatment and preparation method thereof
  • Ce-doped spherical zno photocatalyst applied to dye wastewater treatment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Add 1.00g of zinc nitrate hexahydrate, 0.60g of hexamethylenetetramine, 0.25g of sodium citrate and 200mL of distilled water in sequence in a 250mL beaker, stir mechanically for 0.5h, and then adjust the pH of the system to 11 with ammonia water;

[0029] Step 2: Transfer the mixed solution obtained in Step 1 to a Teflon-lined microwave hydrothermal tank with a filling ratio of 50%, and then put it into a microwave digestion apparatus for reaction; the reaction temperature is 170°C, the microwave power is 600W, and the heat preservation reaction Time 3h; After the reaction finishes, take out the water heating tank;

[0030] Step 3: Centrifuge the mixed solution obtained in Step 2 and wash the centrifuged precipitate with distilled water and absolute ethanol respectively, and place the precipitate in a vacuum oven at 60° C. for 12 hours to obtain a spherical ZnO photocatalyst.

Embodiment 2

[0032] Step 1: Add 1.10g of zinc nitrate hexahydrate, 0.57g of hexamethylenetetramine, 0.26g of sodium citrate, 0.01g of cerium nitrate hexahydrate and 200mL of distilled water in a 250mL beaker, stir mechanically for 0.5h, and then use ammonia water to Adjust the pH of the system to 11;

[0033] Step 2: Transfer the mixed solution obtained in Step 1 to a polytetrafluoroethylene-lined microwave hydrothermal tank with a filling ratio of 50%, and then put it into a microwave digestion apparatus for reaction; the reaction temperature is 155°C, the microwave power is 700W, and the heat preservation reaction Time 2.5h; After the reaction is over, take out the water heating tank;

[0034] Step 3: Centrifuge the mixed liquid obtained in Step 2 and wash the centrifuged precipitate with distilled water and absolute ethanol respectively, and place the precipitate in a vacuum oven at 70° C. for 10 h to obtain a Ce-doped spherical ZnO photocatalyst.

Embodiment 3

[0036] Step 1: Add 1.20g of zinc nitrate hexahydrate, 0.55g of hexamethylenetetramine, 0.28g of sodium citrate, 0.02g of cerium nitrate hexahydrate and 200mL of distilled water in sequence in a 250mL beaker, stir mechanically for 1 hour, and then adjust with ammonia water The pH of the system is 11;

[0037] Step 2: Transfer the mixed solution obtained in Step 1 to a polytetrafluoroethylene-lined microwave hydrothermal tank with a filling ratio of 50%, and then put it into a microwave digestion apparatus for reaction; the reaction temperature is 140°C, the microwave power is 800W, and the heat preservation reaction Time 2h; After the reaction finishes, take out the water heating tank;

[0038] Step 3: Centrifuge the mixed solution obtained in Step 2 and wash the centrifuged precipitate with distilled water and absolute ethanol respectively, and place the precipitate in a vacuum oven at 80° C. for 8 hours to obtain a Ce-doped spherical ZnO photocatalyst.

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Abstract

The invention relates to a Ce-doped spherical ZnO photocatalyst applied to dye wastewater treatment and a preparation method thereof. As a photocatalyst, ZnO has defects such as low utilization rate of visible light and high recombination rate of photogenerated electrons, which limit the photocatalytic performance of ZnO. In the present invention, zinc nitrate hexahydrate is used as the seed crystal source of ZnO, hexamethylenetetramine is used as the alkali source, ammonia water is used as the pH regulator of the system, sodium citrate is used as the shape inducer of spherical ZnO, and cerium nitrate hexahydrate is used as the dopant , prepared Ce-doped spherical ZnO photocatalyst. In the present invention, Ce is doped into the crystal structure of spherical ZnO, which can significantly improve the surface state of ZnO, which is conducive to the generation of more surface hydroxyl groups, and can inhibit the recombination of photogenerated electrons and photogenerated holes (e‑ / h+), broadening the ZnO surface state. Spectral response range, improve the utilization rate of ZnO to ultraviolet light and visible light, and then improve the activity of ZnO photocatalytic degradation of dyes.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a Ce-doped spherical ZnO photocatalyst applied to dye wastewater treatment and a preparation method thereof. Background technique [0002] Using semiconductor materials as photocatalysts can photocatalytically oxidize organic pollutants. ZnO is a very efficient semiconductor photocatalyst. It is a new type of wide-bandgap semiconductor material with many excellent properties. Catalytic properties, and a wide range of zinc sources, simple preparation, non-toxic, non-polluting. ZnO can destroy various organic pollutants through light-assisted catalysis, and the electrons on the conduction band have moderate reducing ability, which can reduce heavy metal ions in water without removing mineral elements beneficial to human body in water. However, as a photocatalyst, ZnO itself has some defects, such as low utilization rate of visible light and high recombination rate o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10C02F1/32
Inventor 刘俊莉惠爱平李妍马建中
Owner 陕西华盈博越科技有限公司