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Preparation method of nickel metal-organic framework material for adsorbing water-borne pollutants

A metal-organic framework and pollutant technology, applied in water pollutants, adsorbed water/sewage treatment, radioactive pollutants, etc., can solve the problem of low adsorption capacity, achieve high adsorption capacity, wide source of raw materials, and simple preparation

Inactive Publication Date: 2019-04-23
NINGBO ZHETIE JIANGNING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (vi) Low adsorption capacity

Method used

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  • Preparation method of nickel metal-organic framework material for adsorbing water-borne pollutants
  • Preparation method of nickel metal-organic framework material for adsorbing water-borne pollutants

Examples

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preparation example Construction

[0035] A method for preparing a nickel metal organic framework material for adsorbing pollutants in water, comprising the following steps:

[0036] Step S1: Mix nickel hydroxide and 20-30wt% hexafluorosilicic acid aqueous solution (the molar ratio of hexafluorosilicic acid and nickel hydroxide is 1:1.1), stir and react for 3-5 hours to obtain a green mixture.

[0037] Step S2: filter the green mixture with suction to obtain a green nickel hexafluorosilicate aqueous solution, and obtain green nickel hexafluorosilicate crystals after recrystallization.

[0038] Step S3: Mix the methanol solution of nickel hexafluorosilicate crystals with the methanol solution of 2-mercaptopyrazine (the molar ratio of nickel hexafluorosilicate to 2-mercaptopyrazine is 1:1 to 1:1.2, with 8- Heating at a rate of 12°C / min to 80-90°C for self-assembly reaction, and cooling down to room temperature after 6-8h of reaction, a yellow sample was obtained.

[0039] Step S4: Suction-filtering the yellow sa...

Embodiment 1

[0041] Preparation of nickel hexafluorosilicate: Take 2.1g of nickel hydroxide in a 100mL round bottom flask, then add 10mL of 25% aqueous solution of hexafluorosilicate, wherein the molar ratio of hexafluorosilicate to nickel hydroxide is 1:1.1, The reaction was stirred at room temperature for 4h. Suction filter with a Buchner funnel to obtain a green solution, dry and remove water to obtain green hexafluorosilicate crystals for future use.

[0042] The nickel hexafluorosilicate prepared by the above method is a self-made raw material under optimal conditions, and has high phase purity. The nickel hexafluorosilicate in the subsequent examples all adopts this synthesis method.

[0043] Preparation of nickel metal-organic framework (referred to as SIXSIF-3-Ni-SH): 0.200g of nickel hexafluorosilicate was dissolved in 10mL of methanol solution and 0.112g of 2-mercaptopyrazine, an organic ligand that introduced mercapto functional groups, respectively. Dissolve in 22.4mL of metha...

Embodiment 2

[0045] The difference from Example 1 is that the reaction temperature is 85°C, the reaction vessel is a 50mL polytetrafluoroethylene reactor, and the reaction time for preparing nickel metal-organic framework material (marked as SIXSIF-3-Ni-SH) is 6h .

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Abstract

The invention relates to the field of water treatment and discloses a preparation method of a nickel metal-organic framework material for adsorbing water-borne pollutants. The method comprises mixingnickel hydroxide and hexafluorosilicic acid aqueous solution for stirred reaction to obtain a green mixture; suction-filtering the green mixture to obtain green nickel hexafluorosilicate aqueous solution, and performing recrystallization to obtain green nickel hexafluorosilicate crystal; mixing the methanol solution of the nickel hexafluorosilicate crystal with the methanol solution of 2-mercaptopyrazine, heating the mixture for self-assembling reaction, and then cooling down to room temperature to obtain a yellow sample; suction-filtering the yellow sample to obtain the sulfhydrylated metal-organic framework material. According to the preparation method of the nickel metal-organic framework material for adsorbing the water-borne pollutants, by performing sulfydryl modification on a metal-organic framework, the advantages of various components can be given full play to, collaboration on properties can be achieved, and the prepared nickel metal-organic framework material for adsorbing the water-borne pollutants has the advantages of being numerous in active group sites, good in absorptive property, simple in preparation and the like and is a heavy metal adsorbing material with a good development prospect.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a preparation method of a nickel metal organic framework material for adsorbing pollutants in water. Background technique [0002] In recent years, with the rapid development of industry, environmental pollution, especially heavy metal pollution, has become one of the serious problems that must be controlled. Radioactive metal ions (Pd, Cs, Sr, U, Fe, Co, Zn, etc.), toxic heavy metal cations (Hg 2+ , Pb 2+ , Cd 2+ , Cu 2+ , etc.) and oxyanions (CrO 4 2- , Cr 2 o 7 2− , AsO 4 3− , SeO 3 2− , SeO 4 2− etc.) are major pollutants in nuclear waste and industrial wastewater, posing serious threats to humans and other species. Compared with organic pollutants, toxic heavy metal ions such as Pb 2+ , Cu 2+ , Cd 2+ , Zn 2+ , Hg 2+ , Ni 2+ and Cr 2 o 7 2- etc., are difficult to degrade into eco-friendly substances, accumulate in organisms, and form many highly toxic or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/20
CPCB01J20/226B01J20/3085C02F1/285C02F2101/006C02F2101/20
Inventor 毛正余温慧敏胡军
Owner NINGBO ZHETIE JIANGNING CHEM
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