Preparation method of bifunctional polymer adsorbent and application of bifunctional polymer adsorbent in gold recovery

A polymer and adsorbent technology, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., to achieve the effect of improving adsorption capacity, simple preparation method, and environmental friendliness

Active Publication Date: 2021-07-02
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has been no report on the preparation of bifunctional polymer adsorbents based on functionalized dopamine derivatives for the recovery of precious metals

Method used

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  • Preparation method of bifunctional polymer adsorbent and application of bifunctional polymer adsorbent in gold recovery
  • Preparation method of bifunctional polymer adsorbent and application of bifunctional polymer adsorbent in gold recovery
  • Preparation method of bifunctional polymer adsorbent and application of bifunctional polymer adsorbent in gold recovery

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Embodiment 1

[0030] Example 1: Preparation method and characterization of a bifunctional polymer adsorbent

[0031] 1.8964g of dopamine, 1.0005g of tetrafluoroterephthalonitrile (TFN) and 2.764g of anhydrous potassium carbonate were placed in a three-neck round bottom flask, and then 80mL of anhydrous tetrahydrofuran / N,N-dimethylformamide (9 :1v / v), mix evenly and seal, vacuumize with vacuum pump for 20min, then feed nitrogen and stir at 85°C for 3 days under nitrogen atmosphere, take it out and cool to room temperature, remove nitrogen source, continue stirring at room temperature for 24h, The mixture was taken out and the precipitate was collected by filtration, and 0.5mol / L HCl solution was added dropwise until no CO 2 Effort to remove unreacted K 2 CO 3 , washed the precipitate with water, tetrahydrofuran, N,N-dimethylformamide, and acetone, and finally Soxhlet extracted in THF and acetone for 24 hours, and dried in vacuum at 60°C for 12 hours to obtain brown-black polymer PDA-TFN; ...

Embodiment 2

[0033] Example 2: Application of a dual-functional polymer adsorbent in the adsorption of gold

[0034] The pH value of the Au(III) solution was optimized. The results showed that when the pH of Au(III) solution was 2.0, the adsorption efficiency of Au(III) by the bifunctional polymer adsorbent PDA-TFN-A was the greatest. When the pH of the solution is higher than 5.0, the efficiency of PDA-TFN-A to adsorb Au(III) is low, which is due to the OH in aqueous chloride solution. - with Cl - Competing to form hydroxyl-containing gold complexes. Therefore, the optimal reaction pH value of Au(III) aqueous solution was selected as 2.0.

[0035] The adsorption capacity and adsorption kinetics of Au(III) on bifunctional polymer adsorbent PDA-TFN-A were studied. Potassium chloroaurate was dissolved in ultrapure water to prepare Au(III) solutions with different concentrations, and the pH value of the solution was adjusted to 2.0 with HCl or NaOH, and 5 mg of PDA-TFN-A was added to 20 m...

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Abstract

The invention discloses a preparation method of a bifunctional polymer adsorbent and application of the bifunctional polymer adsorbent in gold recovery, and belongs to the technical field of adsorption materials. The preparation method comprises the following steps: carrying out aromatic nucleophilic reaction on dopamine (DA) and tetrafluoroterephthalonitrile (TFN) to form a polymer PDA-TFN, and then converting cyano into amide under an alkaline condition to prepare the bifunctional polymer adsorbent PDA-TFN-A. ThePDA-TFN-A contains a large number of indole structures and amide functional groups, and can be specifically combined with Au (III) to improve the adsorption capacity. The PDA-TFN-A can be used for reducing Au (III) into Au (0), so that the PDA-TFN-A has good recovery performance on gold. The method for synthesizing the bifunctional polymer is simple, low in cost, environmentally friendly, economical and efficient, and is expected to be used for recycling gold in electronic waste liquid through the synergistic effect of adsorption and reduction.

Description

technical field [0001] The invention belongs to the technical field of adsorbent materials, and in particular relates to a preparation method of a bifunctional polymer adsorbent and its application in gold recovery. Background technique [0002] With the advent of economic integration, the electronics industry has become a major strategic development industry in various countries around the world due to its characteristics of low consumption, no pollution, and high value-added. It is well known that the development of the electronic industry produces a large amount of electronic waste and electronic equipment waste, which contains precious metals that may cause waste (Mon, M.; Ferrando-Soria, J.; Grancha, T.; Fortea-Pérez, F.R.; Gascon, J.; Leyva-Pérez, A.; Armentano, D.; Pardo, E. Selective gold recovery and catalysis in a highly flexible methionine-decorated metal-organic framework. J.Am.Chem.Soc.2016,138,7864-7867 ). As a popular precious metal, gold is widely used in c...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/70C22B11/00C22B3/24C02F101/20
CPCB01J20/265B01J20/3071B01J20/3085C02F1/285C02F1/70C22B11/04C22B3/24C02F2101/20Y02P10/20
Inventor 邱建丁李学晶梁汝萍
Owner NANCHANG UNIV
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