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Imine-type covalent organic framework photocatalyst with pyridazine structure for reducing hexavalent chromium, preparation method and application thereof

A technology of covalent organic framework and photocatalyst, which is applied in the field of preparation and covalent organic framework photocatalyst, achieves the effects of high application value, no metal ion release risk, and easy promotion.

Active Publication Date: 2022-01-25
PEKING UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0008] However, at present, there are few reports on the application of COFs materials in the field of hexavalent chromium reduction.

Method used

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  • Imine-type covalent organic framework photocatalyst with pyridazine structure for reducing hexavalent chromium, preparation method and application thereof
  • Imine-type covalent organic framework photocatalyst with pyridazine structure for reducing hexavalent chromium, preparation method and application thereof
  • Imine-type covalent organic framework photocatalyst with pyridazine structure for reducing hexavalent chromium, preparation method and application thereof

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Embodiment 1

[0063] Accurately weigh 0.9mmol (190mg) of 2,4,6-trihydroxybenzene-1,3,5-tricarbaldehyde and 1.35mmol (149mg) of 3,6-diaminopyridazine into a 20mL special In the liner of the Teflon reactor. Subsequently, 4.5 mL of 1,4-dioxane, 4.5 mL of mesitylene and 1.5 mL of 3M acetic acid solution were added to the above Teflon liner. After 20 minutes of ultrasonic vibration to mix all the reactants evenly, put the liner into a high-temperature and high-pressure reactor, seal it, and place it in an oven at 120°C for 3 days. After taking out and cooling to room temperature, the brown solid precipitate was suction-filtered and carefully washed 5 times with acetone, and then the brown powder was dried in an oven at 60°C for 12 hours to prepare the imine-type covalent organic framework material COF with a pyridazine structure -PDZ. ( figure 1 )

[0064] The powder X-ray diffraction (XRD) pattern of the covalent organic framework material COF-PDZ with pyridazine structure synthesized in th...

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Abstract

The invention provides an imine-type covalent organic framework photocatalyst COF-PDZ with a pyridazine structure for reducing hexavalent chromium. Benzene-1,3,5-tricarbaldehyde and 3,6-diaminopyridazine were added to a solvent system consisting of 1,4-dioxane, mesitylene and 3M acetic acid solution, and the reaction was carried out by heating after ultrasonic vibration , washed and dried to obtain the covalent organic framework material COF-PDZ. In the present invention, a covalent organic framework material with a pyridazine structure is synthesized by a solvothermal method for the first time, and the chemical reagents and equipment required are easily obtained, the operation is simple, the application value is high, and the promotion is easy; the photocatalytic reduction of hexavalent chromium is fast and effective. ; And COF‑PDZ is safe and stable, without the risk of metal ion release, and can be effectively regenerated and reused after use.

Description

technical field [0001] The invention relates to a covalent organic framework photocatalyst, a preparation method and its application, in particular to an imine-type covalent organic framework hexavalent chromium photocatalyst with a pyridazine structure, a preparation method and its application. Background technique [0002] The widespread application of chromium (Cr) in electroplating, metallurgy, leather tanning, dyeing, anticorrosion, pigments, and polishing industries has led to the ubiquity of Cr in the natural environment, especially in water bodies (Lai, K.C.K.; Lo, I.M.C., Removal ofchromium (VI) by acid-washed zero-valent iron under various groundwater geochemistry conditions[J].Environ.Sci.Technol.2008,42(4):1238-1244.). The main forms of chromium are trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)). Notably, hexavalent chromium is 500 times more toxic than trivalent chromium and is therefore considered the most important toxic pollutant by the US Env...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06B01J37/10B01J37/34C08G12/26C08G83/00C02F1/30C02F1/70C02F101/22
CPCB01J31/06B01J35/004B01J37/10B01J37/343C02F1/30C02F1/70C08G83/008C08G12/26C02F2101/22C02F2305/10B01J2231/62
Inventor 童美萍刘福洋马知遥
Owner PEKING UNIV
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