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

A photocatalyst and dye wastewater technology, which is applied in the field of materials, can solve the problems of low utilization rate of visible light, high recombination rate and limitation of photogenerated electrons, and achieve the effects of good crystallinity, stable preparation system and uniform product size

Active Publication Date: 2017-08-11
SHAANXI UNIV OF SCI & TECH
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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, high recombination rate of photogenerated electrons, etc. These shortcomings limit the photocatalytic performance of ZnO to a certain extent. , it is necessary to broaden the spectral response range of ZnO

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: Dissolve 8.8g sodium hydroxide in 25mL water to obtain a sodium hydroxide solution, then add 4.2g zinc nitrate hexahydrate and cerium nitrate hexahydrate with a molar ratio of [Ce] / [Zn] of 0.4% to sodium hydroxide in turn The solution is mechanically stirred until the solution becomes clear, and the precursor solution of Ce-doped flower-like ZnO is obtained;

[0031] Step 2: Add 300 mL of sodium lauryl sulfate solution with a molar concentration of 0.030 mol / L to the precursor solution of Ce-doped flower-like ZnO. The sodium lauryl sulfate solution is dissolved in sodium lauryl sulfate Obtained from a mixture of anhydrous ethanol and water, the volume mixing ratio of anhydrous ethanol and water is 4:1, then mechanically stirred for 0.5h, and then sonicated for 0.5h under ultrasonic power of 500W;

[0032] Step 3: After the ultrasound is completed, first transfer the mixed solution obtained in step 2 to a microwave hydrothermal tank lined with polytetrafluoroethylene,...

Embodiment 2

[0034] Step 1: Dissolve 9.0g sodium hydroxide in 25mL water to obtain sodium hydroxide solution, then add 4.0g zinc nitrate hexahydrate and cerium nitrate hexahydrate with a molar ratio of 0.8% [Ce] / [Zn] to sodium hydroxide in turn The solution is mechanically stirred until the solution becomes clear, and the precursor solution of Ce-doped flower-like ZnO is obtained;

[0035] Step 2: Add 300 mL of sodium lauryl sulfate solution with a molar concentration of 0.025 mol / L to the precursor solution of Ce doped flower-like ZnO. The sodium lauryl sulfate solution is dissolved in sodium lauryl sulfate Obtained from a mixture of anhydrous ethanol and water, the volume mixing ratio of anhydrous ethanol and water is 4:1, then mechanically stirred for 0.5h, and then sonicated for 0.5h at an ultrasonic power of 400W;

[0036] Step 3: After the ultrasound is completed, first transfer the mixed solution obtained in step 2 to a microwave hydrothermal tank lined with polytetrafluoroethylene, with...

Embodiment 3

[0038] Step 1: Dissolve 9.2g sodium hydroxide in 25mL water to obtain sodium hydroxide solution, then add 3.8g zinc nitrate hexahydrate and cerium nitrate hexahydrate with a molar ratio of 0.8% [Ce] / [Zn] to sodium hydroxide in turn The solution is mechanically stirred until the solution becomes clear, and the precursor solution of Ce-doped flower-like ZnO is obtained;

[0039] Step 2: Add 300 mL of sodium lauryl sulfate solution with a molar concentration of 0.020mol / L to the precursor solution of Ce-doped flower-like ZnO. The sodium lauryl sulfate solution is dissolved in sodium lauryl sulfate Obtained from a mixture of anhydrous ethanol and water, the volume mixing ratio of anhydrous ethanol and water is 4:1, then mechanically stirred for 1 hour, and then sonicated for 1 hour at an ultrasonic power of 300W;

[0040] Step 3: After the ultrasound is completed, first transfer the mixed solution obtained in step 2 to a microwave hydrothermal tank lined with polytetrafluoroethylene, w...

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Abstract

The invention relates to a Ce-doped flower-shaped ZnO photocatalyst applicable to treatment of dye wastewater and a preparation method thereof. As a photocatalyst, ZnO has the defects of low utilization rate of visible light, high recombination rate of photoelectrons, etc., so photocatalytic performance of ZnO is limited. According to the invention, ZnO of a flower-shaped structure is prepared by using sodium hydroxide as an alkali source, zinc nitrate hexahydrate as a ZnO seed crystal source, sodium dodecyl sulfate as a dispersing agent, cerium nitrate hexahydrate as a doping agent and a mixture of ethanol and water as a solvent and carrying out mechanical stirring, ultrasonic treatment, microwave-assisted hydrothermal synthesis, centrifuging, drying and the like. Photocatalytic degradation experiments show that the introduction of heteroatom Ce into ZnO crystal lattice structure can effectively inhibit the recombination of photoelectrons and photoholes (e- / h+) inside ZnO and broaden the spectral response range of ZnO; thus, practical reference basis is provided for improving visible light utilization efficiency of nanometer ZnO photocatalysis.

Description

Technical field [0001] The invention belongs to the technical field of materials, and specifically relates to a Ce-doped flower-shaped ZnO photocatalyst applied to dye wastewater treatment and a preparation method thereof. Background technique [0002] As one of the main pollution sources of water bodies, dye wastewater has many difficulties in the treatment process, such as high COD concentration, difficult degradation of some organic substances, and poor biodegradability. Among many dye wastewater treatment technologies, semiconductor photocatalysis technology has the advantages of high treatment efficiency, no secondary pollution, and low treatment cost. It is considered as a potential deep purification technology for environmental pollution. [0003] As an important wide-bandgap semiconductor oxide, ZnO has a band gap of 3.37eV at room temperature and an exciton binding energy of 60meV. It can react at room temperature and pressure, oxidize organic matter thoroughly, has low co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10C02F1/30
Inventor 马建中惠爱平刘俊莉
Owner SHAANXI UNIV OF SCI & TECH