Defect-state catalytic membrane derived from metal organic framework as well as preparation method and application of defect-state catalytic membrane

A metal-organic framework and defect state technology, applied in the field of water treatment, can solve the problems of secondary pollution tolerance, complex catalyst preparation process, etc., and achieve high tolerance, convenient recycling and multiple utilization, and enhanced mass transfer Effect

Active Publication Date: 2022-07-22
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a metal-organic framework-derived defect state catalytic membrane and its preparation method and application, to solve the problems of complex preparation process, secondary pollution and poor tolerance of the catalyst rich in oxygen vacancies provided by the prior art

Method used

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  • Defect-state catalytic membrane derived from metal organic framework as well as preparation method and application of defect-state catalytic membrane
  • Defect-state catalytic membrane derived from metal organic framework as well as preparation method and application of defect-state catalytic membrane
  • Defect-state catalytic membrane derived from metal organic framework as well as preparation method and application of defect-state catalytic membrane

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preparation example Construction

[0037] The present invention provides a method for preparing a metal-organic framework-derived defective catalytic membrane, comprising the following steps:

[0038] (1) In the three-electrode system, the nickel foam is used as the working electrode, and the methanol solution of 2-methylimidazole is used as the electrolyte solution, and it runs for a certain period of time under a certain potential;

[0039] (2) then adding the methanol solution of cobalt nitrate into the electrolyte solution, adjusting the potential and running for a certain period of time to obtain a foamed nickel-based ZIF-67 membrane;

[0040](3) The foamed nickel-based ZIF-67 film was calcined in a certain oxygen atmosphere to obtain a defect state catalytic film derived from the metal-organic framework.

[0041] In the present invention, the counter electrode of the three-electrode system in step (1) is preferably a Pt electrode, and the reference electrode is preferably an Ag / AgCl electrode.

[0042] I...

Embodiment 1

[0055] The present embodiment provides a method for preparing a metal-organic framework-derived defective catalytic membrane, comprising the following steps:

[0056] (1) In a three-electrode system, with nickel foam as the working electrode, Pt electrode as the counter electrode, Ag / AgCl electrode as the reference electrode, 50 mL of methanol solution containing 4 mmol of 2-methylimidazole as the electrolyte solution, at 1.0 V vs. Run for 1 min at Ag / AgCl potential;

[0057] (2) Then 50 mL containing 0.5 mmol Co(NO 3 ) 2 ·6H 2 The methanol solution of O was added to the above electrolyte solution, and the potential was adjusted to -1.5V vs Ag / AgCl and then run for 20 min to obtain a foamed nickel-based ZIF-67 film, which was recorded as NFZ film;

[0058] (3) After cleaning and drying the NFZ film, it was placed in a muffle furnace, the oxygen pressure was set to 5Pa, the temperature was raised to 450°C at a heating rate of 5°C / min, and calcined at 450°C for 2 hours to obt...

Embodiment 2

[0060] This embodiment provides a metal-organic framework-derived defect state catalytic membrane. For details, refer to Embodiment 1. The difference is that the oxygen pressure in step (3) is set to 10Pa.

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Abstract

The invention belongs to the technical field of water treatment, and discloses a metal organic framework derived defect-state catalytic membrane as well as a preparation method and application thereof. In a three-electrode system, foamed nickel is used as a working electrode, a methanol solution of 2-methylimidazole is used as an electrolyte solution, and operation is performed for a certain time under a certain potential; then adding a methanol solution of cobalt nitrate into an electrolyte solution, adjusting the potential, running for a certain time, and calcining the obtained foamed nickel-based ZIF-67 membrane in a certain oxygen atmosphere to obtain the metal organic framework derived defect-state catalytic membrane. According to the preparation method, a doping agent or an acid-base etching agent does not need to be additionally introduced, the prepared catalytic membrane is rich in oxygen vacancies, potassium monopersulfate is activated to generate oxygen active species, electron-rich organic pollutants can be selectively degraded, and the catalytic membrane has high tolerance (pH and inorganic salt) to a complex system, long half-life period (2 microseconds) and wide application prospects.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a defect state catalytic membrane derived from a metal organic framework and a preparation method and application thereof. Background technique [0002] Generation of oxygen-reactive species based on activated persulfuric acid (radicals: hydroxyl radicals, HO · , sulfate radicals, SO 4 ·– ; non-radical: singlet oxygen, 1 O 2 etc.) The advanced oxidation technology for degrading organic matter has become a water environment remediation technology that has attracted much attention and has great development prospects due to its high efficiency, easy storage of persulfate, and low price. However, the free radical-based persulfate activation process seriously hinders its further development in practical applications due to its high dependence on ambient pH and the easy formation of toxic by-products with inorganic salt ions. And in the non-radical ( 1 O 2 ), due to its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J27/24B01J31/16B01J31/18B01J37/08B01J37/34C02F1/72C25B3/13C02F101/34C02F101/30C02F101/38
CPCB01J37/086B01J37/348B01J27/24B01J23/75B01J31/1691B01J31/1815C02F1/725C25B3/13C02F2101/34C02F2101/38C02F2101/345C02F2101/308C02F2101/40B01J2531/845Y02W10/37
Inventor 刘艳彪尤世界李墨华李方
Owner DONGHUA UNIV
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