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Preparation method of composite photocatalyst Ag/AgCl@ZIF-67 and composite photocatalyst prepared by using same

A technology of ZIF-67 and composite light, which is applied in the direction of catalyst activation/preparation, organic compound/hydride/coordination complex catalyst, chemical instruments and methods, etc., can solve the problem of poor adsorption capacity of organic pollutants, easy agglomeration, Catalytic efficiency is not high, to achieve the effect of low raw material cost, excellent adsorption capacity, excellent photocatalytic effect

Inactive Publication Date: 2020-07-28
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such catalytically active substances have disadvantages such as poor adsorption capacity for organic pollutants and easy agglomeration, which makes their catalytic efficiency in practical applications not high.

Method used

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  • Preparation method of composite photocatalyst Ag/AgCl@ZIF-67 and composite photocatalyst prepared by using same
  • Preparation method of composite photocatalyst Ag/AgCl@ZIF-67 and composite photocatalyst prepared by using same

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Embodiment 1

[0044] The following method is used to prepare the composite photocatalyst Ag / AgCl@ZIF-67 according to the present invention:

[0045](1) The methanol (100mL) solution of cobalt nitrate hexahydrate (6.4890g, 22.30mmol) was mixed rapidly with the methanol (100mL) solution of 2-methylimidazole (1.3686g, 16.67mmol), stirred for 5 hours, and the reaction was completed Finally, the obtained purple crystals were centrifuged, washed three times with methanol, and dried at 60°C for 10 hours to obtain ZIF-67;

[0046] (2) The ZIF-67 (50 mg) was added to a solution of silver nitrate (0.3397 g, 2.00 mmol) in methanol (30 mL), and stirred continuously for 30 minutes under dark conditions to obtain a mixed suspension;

[0047] (3) Add a methanol (10mL) solution of cobalt chloride hexahydrate (0.1190g, 0.50mmol) to the mixed suspension, stir continuously for 40 minutes under dark conditions, then irradiate with a wavelength of 365nm and an intensity of 175mW / m 2 UV-visible light for 20 m...

Embodiment 2

[0049] The following method is used to prepare the composite photocatalyst Ag / AgCl@ZIF-67 according to the present invention:

[0050] (1) The methanol (100mL) solution of cobalt nitrate hexahydrate (7.9451g, 27.30mmol) was mixed rapidly with the methanol (100mL) solution of 2-methylimidazole (2.1896g, 26.67mmol), stirred for 6 hours, and the reaction was completed Finally, the obtained purple crystals were centrifuged, washed three times with methanol, and dried at 50°C for 10 hours to obtain ZIF-67;

[0051] (2) The ZIF-67 (50 mg) was added to a solution of silver nitrate (0.4418 g, 2.60 mmol) in methanol (30 mL), and stirred continuously for 40 minutes under dark conditions to obtain a mixed suspension;

[0052] (3) Add a methanol (10mL) solution of cobalt chloride hexahydrate (0.1785g, 0.75mmol) to the mixed suspension, stir continuously for 30 minutes under dark conditions, then irradiate with a wavelength of 365nm and an intensity of 175mW / m 2 UV-visible light for 20 ...

Embodiment 3

[0054] The following method is used to prepare the composite photocatalyst Ag / AgCl@ZIF-67 according to the present invention:

[0055] (1) The methanol (100mL) solution of cobalt nitrate hexahydrate (9.4003g, 32.30mmol) was mixed rapidly with the methanol (100mL) solution of 2-methylimidazole (1.2315g, 15.00mmol), stirred for 5 hours, and the reaction was completed Finally, the obtained purple crystals were centrifuged, washed three times with methanol, and dried at 70°C for 10 hours to obtain ZIF-67;

[0056] (2) The ZIF-67 (50 mg) was added to a solution of silver nitrate (0.4928 g, 2.90 mmol) in methanol (30 mL), and stirred continuously for 30 minutes under dark conditions to obtain a mixed suspension;

[0057] (3) Add a methanol (10mL) solution of cobalt chloride hexahydrate (0.0595g, 0.25mmol) to the mixed suspension, stir continuously for 50 minutes under dark conditions, then irradiate with a wavelength of 365nm and an intensity of 175mW / m 2 UV-visible light for 30 ...

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Abstract

The invention discloses a preparation method of a composite photocatalyst Ag / AgCl@ZIF-67 and the composite photocatalyst prepared by using the same. The preparation method comprises the following steps: (1) mixing a cobalt salt solution with a 2-methylimidazole solution for a reaction to obtain ZIF-67; (2) adding the ZIF-67 into a silver salt solution, and carrying out stirring to obtain a mixed suspension; and (3) adding a cobalt chloride solution into the mixed suspension, performing stirring, and then performing irradiation with ultraviolet visible light so as to obtain the composite photocatalyst Ag / AgCl@ZIF-67. The preparation method is simple and easy to implement and low in implementation cost. Moreover, the composite photocatalyst is uniform in particle and high in stability, has efficient photocatalytic activity and can improve the adsorption effect on organic pollutants, so the composite photocatalyst has excellent photocatalytic degradation efficiency, greatly improves the removal and degradation of organic matters in wastewater and has good application value and prospects in the field of photocatalysis.

Description

technical field [0001] The invention relates to the field of catalysts, more specifically, to a method for preparing a composite photocatalyst Ag / AgCl@ZIF-67 and the composite photocatalyst prepared therefrom. Background technique [0002] With the acceleration of industrialization, environmental pollution is becoming more and more serious. According to the statistics of the Ministry of Environmental Protection, the total amount of wastewater discharged from the textile printing and dyeing industry accounts for the fifth in the total amount of industrial wastewater discharged in the country. The sources of printing and dyeing wastewater and pollutants are very complex, with the characteristics of large changes in water quality, high organic content, and high chroma. Direct discharge will bring great harm to human health and living environment, and will also cause waste of water resources. Therefore, it is very necessary A technology capable of efficiently degrading wastewate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B82Y30/00B01J37/34C02F1/30C02F101/30
CPCB01J31/1691B82Y30/00B01J37/345C02F1/30C02F2101/30C02F2305/10B01J2531/17B01J35/39
Inventor 常娜陈彦如王海涛张浩
Owner TIANJIN POLYTECHNIC UNIV