Application of polyaninophenol as precious metal adsorbent

A technology of polyaniline and precious metal catalysts, which is applied in the direction of adsorption water/sewage treatment, process efficiency improvement, water/sludge/sewage treatment, etc., to achieve high enrichment recovery efficiency and shorten the recovery path effect

Inactive Publication Date: 2019-11-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to obtain a variety of functional groups on the molecular chain through the change of monomer substituents, so as to endow the polymer with a large-capacity redox function, and use this function to expand the development of this polymer into an efficient recovery adsorbent for precious metals , this study has not been reported

Method used

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  • Application of polyaninophenol as precious metal adsorbent
  • Application of polyaninophenol as precious metal adsorbent
  • Application of polyaninophenol as precious metal adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment a

[0065] Add 20mL of deionized water, 2.05g of m-phenylenediamine and 0.11g of hydroquinone into a 100mL beaker in sequence, place it on a magnetic stirrer and stir to dissolve it fully, and obtain a mixed monomer solution with a feeding molar ratio of 95 / 5 , and then placed in a -5°C water bath for later use. Add 150mL of deionized water and 4.76g of sodium persulfate successively into a 200mL beaker, and stir on a magnetic stirrer to fully dissolve it. The sodium persulfate solution was added dropwise to the above mixed monomer solution at a rate of 1 drop / 3 seconds. After the dropwise addition, continue to stir the reaction until 12h, centrifuge the reaction system, and use deionized water several times in turn until the supernatant liquid after centrifugation is clarified and washed with BaCl 2 The solution does not detect SO 4 2- ion so far. The product was transferred to a watch glass and dried at 60° C. to constant weight, and the yield of polyaniline was 57.7%.

Embodiment b

[0067] In a 100mL beaker, add 20mL of 1M hydrochloric acid aqueous solution, 3.39g of phenylenediamine sulfonate and 0.252g of pyroglucinol in turn, place it on a magnetic stirrer and stir to make it fully dissolve, and obtain a mixed monomer solution with a feeding molar ratio of 90 / 10 , and then placed in a 10°C water bath for later use. Add 150mL of 1M hydrochloric acid aqueous solution and 9.1g of ammonium persulfate successively into a 200mL beaker, place on a magnetic stirrer and stir to fully dissolve. The ammonium persulfate solution was added dropwise to the above mixed monomer solution at a rate of 1 drop / 3 seconds. After the dropwise addition, continue to stir the reaction until 12h, centrifuge the reaction system, and use deionized water several times in turn until the supernatant liquid after centrifugation is clarified and washed with BaCl 2 The solution does not detect SO 4 2- ion so far. The product was transferred to a watch glass and dried at 60° C. to co...

Embodiment c

[0069] In a 100mL beaker, add 20mL of 1M nitric acid aqueous solution, 1.73g of anilinesulfonic acid and 1.74g of phenolsulfonic acid successively, place it on a magnetic stirrer and stir to make it fully dissolve, and obtain a mixed monomer solution whose feeding molar ratio is 50 / 50, and then Place in a water bath at 10°C for later use. Add 150mL of deionized water and 4.56g of ammonium persulfate successively into a 200mL beaker, place on a magnetic stirrer and stir to fully dissolve. The ammonium persulfate solution was added dropwise to the above mixed monomer solution at a rate of 1 drop / 3 seconds. After the dropwise addition, continue to stir the reaction until 72h, centrifuge the reaction system, wash several times with deionized water, transfer the product to a watch glass and dry it to constant weight at 60°C, the yield of polyaniline is 26.6% .

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Abstract

The invention relates to application of polyaninophenol as a precious metal adsorbent. Precious metal ions with a concentration of several mg/L to thousands of mg/L can be reduced to 0.1 ppm or below,the adsorption rate is 99.9% or above, and most of the adsorbed precious metal is at an elemental state rather than an ionic state, so that the recycling process path is shortened. The maximum adsorption capacity of the precious metal by polyaninophenol can reach 2000 mg/g which is twice or above the weight of the polyaninophenol. The polyaninophenol can be applied to recovery of gold in waste circuit boards, the adsorption rate of leached gold exceeds 99.96%, the concentration of residual gold after adsorption is performed is less than 0.1 mg/L, and almost all the gold in the solution is adsorbed. When the polyaninophenol is applied to recovery of gold in an electroplating waste liquid, 12 rounds of adsorption are performed, the concentration of the residual gold in each waste liquid obtained after each round of adsorption is performed is less than 0.1 mg/L, the adsorption rate is more than 99.82%, and almost all the gold in the solution is recycled completely; and compared with existing precious metal adsorbents, the adsorbent has obvious advantages in terms of minimum residual precious metal ion concentration, maximum adsorption capacity, a pH application range, a recovery process path and the like.

Description

technical field [0001] The invention relates to the synthesis and application of polyaniline, in particular to the application of polyaniline as a noble metal adsorbent. Background technique [0002] Precious metals, including gold, are precious natural resources. They have high chemical stability, high price, and excellent electrical conductivity. They are often used in the production of jewelry and key components of electronic technology products. In modern society, more and more electronic products are used in people's lives, and the demand for gold in industry is also increasing. On the other hand, due to the replacement of electronic products, the discarded electronic products continue to increase. According to research, 1 ton of randomly discarded computer boards contains 0.45kg of gold. If a large amount of gold in discarded electronic product circuit boards is not properly recovered, it will cause a lot of waste of gold resources. Therefore, it is very valuable to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C22B11/00C22B7/00C22B3/24C02F101/20
CPCB01J20/264C02F1/285C02F2101/20C22B3/24C22B7/006C22B11/04C22B11/042Y02P10/20
Inventor 黄美荣李新贵郭世坚
Owner TONGJI UNIV
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