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Method for template assisted solvothermal preparation of photocatalytic material with ZnO multilevel structure

A technology for auxiliary solvents and catalytic materials, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., and can solve problems such as environmental pollution and resource waste.

Active Publication Date: 2016-11-09
山东奥达复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

GL is generally discarded, which not only causes environmental pollution, but also causes waste of resources

Method used

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  • Method for template assisted solvothermal preparation of photocatalytic material with ZnO multilevel structure
  • Method for template assisted solvothermal preparation of photocatalytic material with ZnO multilevel structure
  • Method for template assisted solvothermal preparation of photocatalytic material with ZnO multilevel structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Pretreatment of GL: After washing GL with water to remove surface impurities, Soxhlet reflux with water and absolute ethanol with a volume ratio of 1:1 for 16 h, and dry it for later use;

[0050] (2) Preparation of ZnO hierarchical structure photocatalytic material: 0.5000 g of treated GL (using GL and Zn(CH 3 COO) 2 2H 2 The mass ratio of O is expressed as 0.139:1) immersed in 3.6000 g Zn(CH 3 COO) 2 2H 2 O in ethanol solution, transferred to a polytetrafluoroethylene autoclave, and reacted at 200 °C for 10 h; after the reaction, the solvent was drained and dried to obtain a precursor material, which was recorded as ZnO / GL; It was calcined at ℃ for 2 h to remove the GL template, and the ZnO nanophotocatalytic material sample (ZnO-550) was obtained. The sample was reacted under a 300 W mercury lamp for 12 minutes, and the degradation rate of 20 mg / L methylene blue was 71.3%.

Embodiment 2

[0052] The calcination condition is: temperature 650 ℃, other are the same as embodiment 1. The obtained ZnO nanophotocatalytic material (ZnO-650) reacted under a 300W mercury lamp for 12 minutes to degrade 20 mg / L methylene blue to a rate of 91.2%.

Embodiment 3

[0054] The calcination condition is: temperature 750 ℃, other are the same as embodiment 1. The obtained ZnO nano-photocatalytic material (ZnO-750) reacted under a 300W mercury lamp for 12 minutes to degrade 20 mg / L methylene blue by 74.5%.

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Abstract

The invention provides a method for template assisted solvothermal preparation of a photocatalytic material with a ZnO multilevel structure. The method comprises the steps that preprocessed ginkgo leaves are soaked in anhydrous ethanol of Zn(CH3COO)2.2H2O and transferred to a high-pressure reaction kettle, and reaction is performed at the temperature of 160-200 DEG C for 8-10 hours; after reaction is completed, the anhydrous ethanol is drained, drying is performed to obtain a precursor; then the precursor is calcinated at the temperature of 550-750 DEG C for 1.0-2.0 hours to remove a template, namely the photocatalytic material with the ZnO multilevel structure is obtained. The material has the hollow and porous structure, plays multiple roles in the photocatalytic process, can effectively absorb and activate reactant molecules and effectively absorb radiation light, and accordingly the photocatalytic efficiency of the material can be effectively improved. Photocatalytic degradation experiments show that the photocatalytic material with the ZnO multilevel structure has higher photocatalytic activity, has the good degradation effect on methylene blue and accordingly has the very good application prospect on the aspect of dye degradation.

Description

technical field [0001] The invention relates to the preparation of a ZnO nanometer photocatalytic material, in particular to a method for template-assisted solvothermal preparation of a ZnO multi-level structured photocatalytic material, which is mainly used in organic dye degradation, sewage treatment, air purification and the like. Background technique [0002] ZnO, commonly known as zinc white, is a direct wide-bandgap semiconductor material with a wurtzite structure at room temperature (bandgap width 3.37 eV), and its exciton binding energy is 60 meV, which can Generate photogenerated electron-hole pairs. It has the advantages of low cost, good photosensitivity, strong oxidation, non-toxicity and excellent chemical stability, and is a good photocatalyst material. Nano-ZnO has a wide range of applications in the field of photocatalysis due to its small particle size, large specific surface area, and its ability to effectively degrade organic dyes. Studies have shown tha...

Claims

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Application Information

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IPC IPC(8): B01J23/06C01G9/02
CPCC01G9/02B01J23/06B01J37/082C01P2004/03C01P2004/04C01P2004/34C01P2002/72B01J35/51B01J35/40B01J35/39
Inventor 苏碧桃董永永王芳萍靳正娟董娜何方振莘俊莲王其召
Owner 山东奥达复合材料有限公司
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