Preparation method of TiO2/ZIF-8 composite photocatalyst

A ZIF-8 and composite light technology, applied in the field of photocatalysis, can solve the problems of difficult loading of ZIF-8, achieve high thermal stability, wide application range, and improve the effect of catalytic degradation efficiency

Active Publication Date: 2019-03-22
HUAIHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on this, it is necessary to provide a TiO 2 Preparation method of / ZIF-8 composite photocatalyst

Method used

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  • Preparation method of TiO2/ZIF-8 composite photocatalyst
  • Preparation method of TiO2/ZIF-8 composite photocatalyst
  • Preparation method of TiO2/ZIF-8 composite photocatalyst

Examples

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preparation example Construction

[0025] The embodiment of the present invention provides a kind of TiO 2 The preparation method of / ZIF-8 composite photocatalyst comprises the following steps:

[0026] S10, solvothermal reaction is performed on the mixed solution of soluble zinc salt, 2-methylimidazole and the first organic solvent, so that 2-methylimidazole is deprotonated and zinc ions are self-assembled into ZIF-8, filtered, washed, dried and then ground Obtain ZIF-8 powder;

[0027] S20, causing the hydrolyzable titanium source to undergo a hydrolysis reaction with water in a second organic solvent to obtain a first solution containing nano-titanium dioxide sol;

[0028] S30, concentrating the first solution, increasing the concentration of the nano-titanium dioxide sol, to obtain a second solution; and

[0029] S40, adding the ZIF-8 powder to the second solution, thoroughly mixing by ultrasonic vibration, filtering, washing and drying to obtain TiO 2 / ZIF-8 composite photocatalyst.

[0030] TiO provid...

Embodiment 1

[0050] S10, first add 0.89g of Zn(NO 3 ) 2 ·6H 2 O and 0.49 g of 2-methylimidazole were dissolved in 80 ml of N,N-dimethylformamide (DMF), and then the mixed solution was transferred to a tetrafluoroethylene-lined autoclave at 5 °C min -1 The heating rate was raised to 140°C, reacted for 24 hours, and centrifuged to obtain a solid. The solid was washed with 50ml of DMF and methanol three times, and then placed in an oven at 80°C for overnight drying. After drying, it is ground into powder to obtain ZIF-8 powder.

[0051] S22, take 20ml of absolute ethanol and add it to a clean and dry flask, drop 4 drops of 0.2ml glacial acetic acid using a rubber dropper, and stir magnetically for 5 minutes; take 2ml tetrabutyl titanate and add it to the above mixture, and stir magnetically for 5 minutes; Slowly add 38ml of deionized water dropwise while stirring. The dropwise addition time is more than 15min. After the dropwise addition, the solution is heated to 45°C and continuously sti...

Embodiment 2

[0056] The preparation method is basically the same as that of Example 1, except that in step S30, 1 / 2 of the volume of the first solution is evaporated.

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Abstract

The invention relates to a preparation method of a TiO2-loaded composite photocatalyst. The method comprises the following steps: subjecting a mixed solution of a soluble zinc salt, 2-methylimidazoleand a first organic solvent to a heated reaction in an autoclave, subjecting 2-methylimidazole to deprotonation, self-assembling ZIF-8 from 2-methylimidazole and zinc ions, carrying out filtering, washing and drying, and then, carrying out grinding, so as to obtain ZIF-8 powder; subjecting a hydrolyzable titanium source to a hydrolysis reaction with water in a second organic solvent, so as to obtain a nano-titania containing first solution; concentrating the first solution to improve the concentration of nano-titania sol, so as to obtain a second solution; adding the ZIF-8 powder into the second solution, carrying out thorough mixing through ultrasonic oscillation, and carrying out filtering, washing and drying, thereby obtaining the TiO2 / ZIF-8 composite photocatalyst.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a TiO 2 / ZIF-8 composite photocatalyst preparation method. Background technique [0002] Photocatalytic technology, that is, semiconductor photocatalyst technology, can be used to degrade organic wastewater, reduce heavy metal ions, purify air, sterilize, and prevent fog. Therefore, semiconductor photocatalytic materials have received extensive attention in the control of environmental pollution. In order to improve the photocatalytic efficiency and service life of semiconductor materials, as well as ensure the stability and safety of materials, it is very important to continuously develop new photocatalytic materials. [0003] Nano titanium dioxide (TiO 2 ) as a photocatalyst is an n-type semiconductor material with excellent performance, which can make full use of solar energy, is highly efficient, energy-saving and environmentally friendly, and shows good photostabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38
CPCB01J31/38B01J35/004
Inventor 向柏霖陈桂万维向德轩
Owner HUAIHUA UNIV
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