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A kind of preparation method of thiourea modified zif-8 material for selective adsorption of gold

A ZIF-8, selective technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of small adsorption capacity and high treatment cost

Inactive Publication Date: 2019-03-12
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorption materials reported more, such as activated carbon and ion exchange resin, have the disadvantages of small adsorption capacity and high treatment cost. Therefore, the development of adsorption materials with large adsorption capacity, fast adsorption speed and strong anti-interference ability is still the core of the adsorption method.

Method used

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  • A kind of preparation method of thiourea modified zif-8 material for selective adsorption of gold
  • A kind of preparation method of thiourea modified zif-8 material for selective adsorption of gold
  • A kind of preparation method of thiourea modified zif-8 material for selective adsorption of gold

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Embodiment

[0020] 1. Synthesis of thiourea modified ZIF-8 material

[0021] Weigh 5.190g of 2-methylimidazole and dissolve it in 160mL of methanol solution, weigh 2.346g of zinc nitrate hexahydrate and dissolve it in 160mL of methanol solution, mix the above two solutions and react with magnetic stirring at room temperature for 1h. Centrifuge for 10 min at a speed of rpm, wash with methanol three times, then vacuum-dry at 60°C for 12 h, and grind in an agate mortar to obtain a ZIF-8 material, labeled as ZIF-8;

[0022] Weigh 2g of thiourea and dissolve it in 40mL of dry ethanol solution, add 1g of ZIF-8 material that was vacuum-dried at 150°C overnight, and react with magnetic stirring at 60°C for 12h. After the reaction, centrifuge at 10,000 rpm for 5min. Washing with 40 mL of ethanol, followed by vacuum drying at 30 °C for 12 h to obtain a thiourea-modified ZIF-8 material, labeled as NH 2 CSNH 2 -ZIF-8.

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Abstract

The invention discloses a preparation method of a thiourea modified ZIF-8 material for selectively adsorbing gold.The method comprises the specific steps that 1, the ZIF-8 material is synthesized, wherein a methanol solution of 2-methylimidazole and a methanol solution of zinc nitrate hexahydrate are mixed and magnetically stirred at room temperature for a reaction, centrifugal separation and drying are performed after the reaction is finished, and the ZIF-8 material is prepared; 2, the thiourea modified ZIF-8 material is synthesized, wherein the ZIF-8 material is added into an ethanol solution of thiourea, magnetic stirring is performed at 60 DEG C for a reaction, centrifugal separation and drying are performed after the reaction is finished, and the thiourea modified ZIF-8 material is prepared.A metal organic framework ZIF-8 is modified through thiourea, and meanwhile by means of the characteristics of ZIF-8 and thiourea, the thiourea modified ZIF-8 material is large in gold adsorption amount, high in adsorption speed and strong in anti-jamming capability is prepared.

Description

technical field [0001] The invention belongs to the technical field of synthesis of gold adsorbents, and in particular relates to a preparation method of a thiourea-modified ZIF-8 material used for selectively adsorbing gold. Background technique [0002] Due to its unique properties, gold is widely used in industries such as electronics and electrical appliances. With the gradual depletion of gold resources and increasingly stringent environmental protection, non-cyanide wet gold extraction technology has attracted widespread attention. The methods for recovering gold from the gold leaching solution include replacement, extraction, adsorption and membrane separation. Considering the selectivity, investment cost and secondary pollution, the adsorption method is one of the most effective methods for recovering gold. However, the adsorption materials reported more, such as activated carbon and ion exchange resin, have the disadvantages of small adsorption capacity and high tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62
CPCB01J20/226B01J2220/44B01J2220/4812C02F1/285C02F2101/20
Inventor 王治科陈凌云崔茂金刘清玲陈海天范顺利
Owner HENAN NORMAL UNIV