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Modified polymer adsorbent for selectively adsorbing and recycling precious metal ions and preparation method ofmodified polymer adsorbent

A noble metal ion, adsorption recovery technology, applied in chemical instruments and methods, other chemical processes, improvement of process efficiency, etc., can solve the problems of low adsorption rate and high cost of precursor synthesis, to improve the adsorption rate and facilitate industrialization The effect of mass production and fast adsorption rate

Active Publication Date: 2021-07-23
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention proposes a modified polymer adsorbent for selective adsorption and recovery of noble metal ions and its preparation method to solve the problem of polythioamide linear polymer adsorbent The adsorption rate is low, and the synthesis cost of the precursor is high

Method used

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  • Modified polymer adsorbent for selectively adsorbing and recycling precious metal ions and preparation method ofmodified polymer adsorbent
  • Modified polymer adsorbent for selectively adsorbing and recycling precious metal ions and preparation method ofmodified polymer adsorbent
  • Modified polymer adsorbent for selectively adsorbing and recycling precious metal ions and preparation method ofmodified polymer adsorbent

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preparation example Construction

[0038] One embodiment of the present invention proposes a method for preparing a modified polymer adsorbent that selectively absorbs and recovers precious metal ions, which is characterized in that it includes the following steps:

[0039] 1) Mix sulfur element, polyamine-based compound, polycarbonyl compound, and loading substrate, add an organic solvent, and obtain a solid-liquid mixture;

[0040] 2) Under a protective gas atmosphere, the above-mentioned solid-liquid mixture is heated and reacted to obtain a modified polymer mixture;

[0041] 3) cooling the above-mentioned modified polymer mixed solution to room temperature, washing, centrifuging, and drying to obtain a modified polymer adsorbent;

[0042] Wherein, the supporting substrate is a porous adsorption material.

[0043] The preparation method of the modified polymer adsorbent proposed in the embodiment of the present invention for selectively adsorbing and recovering precious metal ions, adopts the method of load...

Embodiment 1

[0074] Example 1 A preparation method of a modified polymer adsorbent for selectively adsorbing and recovering precious metal ions, comprising the steps of:

[0075] (1) Weigh 48.1mg of elemental sulfur, 145.6mg of terephthalic acid, 58.1mg of hexamethylenediamine and a certain mass of activated carbon (24mg, 48mg, 72mg, 96mg) into a 20mL pressure-resistant tube, add 2mL of N,N- Methyl acetamide, add a magnetic rotor and stir for 12 minutes, put it into an ultrasonic instrument and sonicate for 12 minutes to obtain a solid-liquid mixture;

[0076] (2) Vacuumize the solid-liquid mixture obtained in step (1) until there are no bubbles, fill it with nitrogen, and heat it to 100° C. to react for 15 hours to obtain a modified polymer mixture;

[0077] (3) Add 4 mL of N,N-dimethylformamide to the modified polymer mixture obtained in step (2), stir for 10 minutes, slowly add it dropwise to 100 mL of methanol, centrifuge for 5 minutes, remove the supernatant and collect Precipitate...

Embodiment 2

[0092] Example 2 A preparation method of a modified polymer adsorbent for selectively adsorbing and recovering precious metal ions, comprising the steps of:

[0093] (1) Weigh 481mg of elemental sulfur, 1750mg of piperazine, 1660mg of terephthalaldehyde and 200mg of polyurethane into a pressure-resistant tube, add 20mL of N,N-dimethylacetamide, add a magnetic rotor to stir for 12 minutes, and put it into an ultrasonic instrument Ultrasound for 12 minutes to obtain a solid-liquid mixture;

[0094] (2) Vacuumize the solid-liquid mixture obtained in step (1) until there are no bubbles, fill it with nitrogen, and heat it to 100° C. to react for 15 hours to obtain a modified polymer mixture;

[0095] (3) Slowly add the modified polymer mixture obtained in step (2) dropwise into 200mL methanol, centrifuge for 5 minutes, remove the supernatant to collect the precipitate; then wash the precipitate with methanol, and centrifuge again after washing Treat for 5 minutes, remove the sup...

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Abstract

The invention provides a modified polymer adsorbent for selectively adsorbing and recovering precious metal ions and a preparation method of the modified polymer adsorbent, and belongs to the technical field of precious metal recovery. The method comprises the following steps: 1) mixing elemental sulfur, a polyamine compound, a polycarbonyl compound and a load substrate, and adding an organic solvent to obtain a solid-liquid mixed solution; 2) in a protective gas atmosphere, carrying out a heating reaction on the solid-liquid mixed solution to obtain a modified polymer mixed solution; and 3) cooling the modified polymer mixed solution to room temperature, washing, centrifuging and drying to obtain a modified polymer adsorbent; wherein the loading substrate is a porous adsorption material. The prepared modified polymer adsorbent is mainly applied to selective adsorption of precious metal ions, and has the effects of high selectivity, high adsorption capacity, high adsorption rate, stable performance and the like on the precious metal ions.

Description

technical field [0001] The invention belongs to the technical field of precious metal recovery, and more specifically relates to a modified polymer adsorbent for selectively absorbing and recovering precious metal ions and a preparation method thereof. Background technique [0002] Precious metals are often used in jewelry, catalysis, electronic devices, etc., but they are found in low levels in the natural environment, so their recovery and separation are crucial. At present, the main sources of precious metal recovery are non-ferrous metallurgy and secondary resources. For example, the content of gold and other precious metals in non-ferrous metallurgy wastewater is about 0-10mg / L, and its huge discharge makes the content of precious metals very considerable; secondary resources The electronic waste in China is called "sleeping minerals". For example, one ton of discarded mobile phones contains more than 270g of gold. [0003] The methods used to recover precious metals f...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C22B11/00C22B7/00
CPCB01J20/265B01J20/3078B01J20/3085B01J20/3071C22B11/042C22B3/24Y02P10/20
Inventor 兰华春赵文金安晓强苗时雨张顺刘会娟曲久辉
Owner TSINGHUA UNIV
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