Preparation method of ZnO-coated ZIF-8 core-shell nano composite material with efficient photocatalytic performance

A nanocomposite material and photocatalytic technology, which is applied in the field of preparation of ZnO@ZIF-8 core-shell nanocomposite materials, can solve the problems of large thickness and inability to significantly improve the photocatalytic efficiency of composite materials, and achieve the effect of improving photocatalytic performance

Active Publication Date: 2021-06-22
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some literatures have reported the preparation method of ZnO@ZIF-8 composite materials, the thickness of the prepared ZIF-8 layer is relatively large (all greater than 40nm), which cannot significantly improve the photocatalytic efficiency of the composite material.

Method used

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  • Preparation method of ZnO-coated ZIF-8 core-shell nano composite material with efficient photocatalytic performance
  • Preparation method of ZnO-coated ZIF-8 core-shell nano composite material with efficient photocatalytic performance
  • Preparation method of ZnO-coated ZIF-8 core-shell nano composite material with efficient photocatalytic performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Add 14.8g of zinc acetate and 60ml of methanol solution into a 250ml round bottom flask, stir and dissolve; add 7.4g of potassium hydroxide and 32ml of methanol solution into a 100ml beaker, wait until completely dissolved and cool; add the potassium hydroxide solution to the zinc acetate The solution was stirred and reacted at 70° C. for 3 days; the reaction product was repeatedly washed with methanol and deionized water, and finally freeze-dried to obtain a white ZnO nanorod powder for future use.

[0054] Weigh 0.3g ZnO nanorods (attached figure 1 ), 20mL of 2.0mg / ml methanol solution of 2-methylimidazole were added to a 50mL tetrapolyfluoride reaction kettle, and then 0.1ml of deionized water was added, and the closed reaction was carried out at 80°C for 24 hours. After washing and washing with water, the ZnO@ZIF-8 nanocomposite with core-shell structure was obtained by freeze-drying at -30 °C and drying time of 12 h (attached figure 2 , 3 a), the shell thickness...

Embodiment 2

[0061] Weigh 0.3g of ZnO nanorods and 20mL of 0.5mg / ml 2-methylimidazole ethanol solution into a 50mL PTFE reaction kettle, then add 0.1ml of deionized water, and react in a sealed environment at 75°C for 48 hours , the reaction product was repeatedly washed with alcohol and water, and then freeze-dried at -25°C for 13 hours to obtain a ZnO@ZIF-8 nanocomposite with a core-shell structure.

[0062] The preparation of the white powder of ZnO nanorods is the same as in Embodiment 1, and the following examples are all ZnO nanorods.

Embodiment 3

[0064] Weigh 0.3g of ZnO nanorods and 20mL of 2.0mg / ml methanol solution of 2-methylimidazole into a 50mL PTFE reaction kettle, then add 0.01ml of deionized water, and react in a sealed environment at 120°C for 72 hours , the reaction product was repeatedly washed with alcohol and water, and then freeze-dried at -20°C for 16 hours to obtain a ZnO@ZIF-8 nanocomposite with a core-shell structure. The shell of the zeolite imidazolate framework material The layer thickness is 5nm (attached image 3 b).

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Abstract

The invention discloses a preparation method of a ZnO-coated ZIF-8 core-shell nano composite material with efficient photocatalytic performance. The preparation method comprises the following steps: in a H2O-organic solvent, reacting zinc oxide nanorods with 2-methylimidazole molecules in the organic solvent, repeatedly washing the reaction product with alcohol and water, and freeze-drying to obtain the ZnO-coated ZIF-8 core-shell nano composite material with a core-shell structure. The preparation method specifically comprises the following steps: (1) weighing 0.1-0.5 g of ZnO nanorods for later use; (2) preparing 20 mL of a 2-methylimidazole organic solvent solution with the mass concentration of 0.5-12 mg / ml for later use; and (3) mixing and pouring the mixture obtained in the step (1) and the step (2) into a tetra-fluorine reaction kettle, then adding 0.01-0.2 ml of deionized water, enabling the zinc oxide nanorod to react with 2-methylimidazole molecules under a solvothermal condition, and carrying out closed reaction for 8-72 hours.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, and in particular relates to a preparation method of a ZnO@ZIF-8 core-shell nanocomposite material with high photocatalytic performance using ZnO as the core and ZIF-8 as the shell. Background technique [0002] Photocatalytic technology has been widely studied in the treatment of refractory organic wastewater and comprehensive wastewater due to its advantages of high catalytic activity, simple equipment, convenient operation, low energy consumption, strong oxidation ability, and no secondary pollution. ZnO is a common n-type semiconductor photocatalyst. However, the wide band gap energy and the rapid recombination of electron-hole pairs generated by photoexcitation have greatly limited the application of ZnO photocatalysts. Heterostructure materials have become an important way to improve the photocatalytic performance of ZnO semiconductors because of their advantages such as easy control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J31/26B01J35/00C02F1/30C02F101/30
CPCB01J31/1691B01J31/1815B01J31/26B01J35/004B01J35/0086C02F1/30B01J2531/26C02F2305/10C02F2101/308
Inventor 李以名曹雪波陈美华储明明
Owner JIAXING UNIV
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