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ZnO@ZIF-8 core-shell structure compound as well as preparation method and application thereof

A core-shell structure and composite technology, which is applied in chemical instruments and methods, water treatment of special compounds, organic compound/hydride/coordination complex catalysts, etc., can solve the problems of less research on core-shell structure, and achieve the goal of preparing The method is simple and the effect of great application prospect

Inactive Publication Date: 2016-03-23
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the contrary, researchers have less research on the core-shell structure of MOF, especially the research on MOF as the shell and functional materials as the core.

Method used

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  • ZnO@ZIF-8 core-shell structure compound as well as preparation method and application thereof
  • ZnO@ZIF-8 core-shell structure compound as well as preparation method and application thereof
  • ZnO@ZIF-8 core-shell structure compound as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1Z

[0024] The synthesis of embodiment 1ZnO hollow sphere

[0025] Add 0.5g of zinc acetate and 43mg of silicotungstic acid into a reaction kettle filled with 10ml of water, and stir for 0.5-1h at room temperature; -1 The heating rate of the reaction kettle was raised to 120 degrees Celsius and reacted for 72 hours to obtain a white precipitate, which was filtered, washed and dried to obtain ZnO hollow spheres. The yield was 85%.

Embodiment 2Zn

[0026] The synthesis of embodiment 2ZnOZIF-8 core-shell structure composite material

[0027] ZnO21mg, 2-methylimidazole 170mg are added in the mixed solution of DMF and water 3:1, after ultrasonic 10min, the stainless steel autoclave of polytetrafluoroethylene lining that mixed solution is housed is put into baking oven, with 15 -20℃·h -1 The heating rate of the oven was raised to 75 degrees Celsius, and the reaction was carried out for 24 hours to obtain a white precipitate, which was filtered, washed, and dried to obtain a ZnOZIF-8 core-shell structure complex. The yield was 78%.

[0028] The present invention synthesizes the XRD of ZnOZIF-8 core-shell structure complex as figure 1 As shown, the characteristic peaks of ZnO and ZIF-8 are consistent with the complex ZnOZIF-8, indicating that the synthesized material contains both ZnO and ZIF-8. The ZnO hollow sphere synthesized by the present invention is as figure 2 As shown, the diameter of ZnO is 1 micron. ZnOZIF-8 c...

Embodiment 3Zn

[0029] Example 3 ZnOZIF-8 core-shell structure composite photocatalytic degradation of organic dyes

[0030] (1) Effect of initial concentration of organic dyes on degradation rate

[0031] Get respectively the rhodamine B dye solution 100ml that concentration is 10mg / L, add 10mg catalyst ZnOZIF-8 (embodiment 1 and 2 preparation), stir, dark reaction 30 minutes, utilize xenon lamp to irradiate rhodamine B dye solution, every 10 minutes with Changes in the concentration of the dye in the dye solution are detected by UV-Vis spectroscopy. The result is as Figure 5 As shown, the intensity of the characteristic peak at 552nm decreases gradually, and the dye is degraded after being irradiated with a xenon lamp, and the final degradation rate reaches 47% in 70 minutes.

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Abstract

The present invention relates to a ZnO@ZIF-8 core-shell structure compound. The synthesis method of the compound comprises the following steps: adding zinc acetate and silicotungstic acid to a reactor; stirring the mixture for 0.5-1h at room temperature; reacting for three days at the temperature of 120 DEG C to obtain a white precipitate, namely ZnO; then adding the obtained ZnO and 2-methylimidazole to a reactor filled with a mixed solution of water and DMF; performing ultrasonic processing for 10min; and reacting for 24h at the temperature of 75 DEG C to obtain a white precipitate, namely a target product. The ZnO@ZIF-8 core-shell structure compound material can be used as a photocatalyst to efficiently degrade the organic dyestuff.

Description

technical field [0001] The present invention relates to a kind of ZnOZIF-8 core-shell structure compound, specifically, relate to the synthesis of a kind of ZnO hollow sphere and the ZnOZIF-8 core-shell structure compound synthesized on the basis of this ZnO hollow sphere, photocatalytic degradation organic Dye-functional ZnOZIF-8 core-shell complex. Background technique [0002] Metal-organic frameworks (MOFs) are new functional materials composed of metal ions or clusters as nodes and multifunctional organic ligands as linkers. MOF materials have three basic characteristics that coexist: crystallinity, porosity, and strong metal-ligand interactions. Its controllable topology and geometric framework and adjustable pore function make it show great application prospects in many fields such as catalysis, gas storage, chemical separation, and sensing. Due to its pore structure, MOF shows strong size selection capability. [0003] ZIFs, a family of metal-organic framework (MO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26C02F1/30C02F101/38
CPCC02F1/30B01J23/06B01J31/0235B01J31/26C02F2305/10C02F2101/38B01J35/19
Inventor 韩正波洪保张静
Owner LIAONING UNIVERSITY
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