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Copoly(1,8-diaminonaphthalene) used as golden iron adsorption agent

A technology of naphthalene diamine and gold ions, applied in the field of poly 1, can solve the problems of high price of ion exchange resins

Inactive Publication Date: 2007-09-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ion exchange resins are generally more expensive, and their adsorption capacity is still far behind that of activated carbon fibers.

Method used

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  • Copoly(1,8-diaminonaphthalene) used as golden iron adsorption agent
  • Copoly(1,8-diaminonaphthalene) used as golden iron adsorption agent
  • Copoly(1,8-diaminonaphthalene) used as golden iron adsorption agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: preparation poly-1,8-naphthalenediamine

[0016] Weigh 1.582 g (10 mmol) of 1,8-naphthalene diamine and dissolve it in 100 mL of acetonitrile, sonicate for 3-5 minutes to promote its full dissolution, and heat in a water bath to keep the temperature at 20°C. Dissolve 2.280 g (10 mmol) of the oxidant ammonium persulfate in 100 mL of deionized water, and add the ammonium persulfate solution dropwise to the stirred monomer solution at a rate of 1 drop / 3 seconds. After the dropwise addition, the reaction was continued, and the total polymerization time was 8 hours. Suction filter after the reaction, wash with deionized water until the filtrate is colorless, and wash with 1M BaCl 2 Solution Check the filtrate until there is no sulfate ion present. Then transfer the filter cake to an Erlenmeyer flask containing 40 mL of acetonitrile, stir, soak and wash for 24 hours to wash away the unreacted 1,8-naphthalene diamine monomer in the polymer. After washing, filt...

Embodiment 2 and 3

[0018] When 50 mg of the product of Example 1 was dropped into an initial concentration of 58.9×10 at 30° C. -3 mol / L gold ion solution was stirred and adsorbed for 144h, filtered through filter paper, and the gold ion concentration in the solution after adsorption was analyzed by iodometric titration, and the adsorption capacity was 2874mg / g. Under the same conditions, the initial concentration of adsorption is 41×10 -3 mol / L gold ion solution, its adsorption capacity is 2823mg / g.

[0019] Place 10 mg of the sample obtained in Example 2 after adsorption of gold ions after filtration on tinfoil paper, and burn it with a gas torch. After the polymer is burnt and volatilized, 6.6g of spongy elemental gold remains on the tinfoil paper .

Embodiment 4 and 5

[0021] 50 mg of the product of Example 1 was dropped into an initial concentration of 32.8×10 at 30° C. -3 Stir and adsorb in the mol / L gold ion solution for 144h, filter through filter paper, and analyze the gold ion concentration in the solution after the adsorption by iodometric titration, and the adsorption rate is 84.1%. Under the same conditions, the initial concentration of adsorption is 20.5×10 -3 mol / L gold ion solution, its adsorption rate is 100%.

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Abstract

The invention relates to applications of poly-1,8-naphthalene diamine. Poly-1,8-naphthalene diamine can be used as gold ion adsorbent, which is carried out by multiple reactive adsorptions. Poly-1,8-naphthalene diamine can adsorb gold ion by static effect after self-protonation and have an oxidation reduction reaction with gold ion for obtain elementary gold, which is a gold ion adsorbent with maximum adsorption capacity. The diameters of reduced elementary gold particles are within a range of nanometer, and the reduced elementary gold particles are distributed evenly on the surface of poly-1,8-naphthalene diamine, which provide good foundation on sensor application.

Description

technical field [0001] The present invention relates to the use of poly-1,8-naphthalene diamines as adsorbents. Background technique [0002] Existing methods for recovering gold from gold leaching solutions include displacement precipitation, extraction, adsorption, and electrolysis, among which adsorption is widely used because of its simplicity and excellent adsorption effect. Common gold ion adsorbents mainly include activated carbon, activated carbon fiber, ion exchange resin, natural fungi, etc. Many researchers have done a lot of fruitful work in exploring efficient gold ion adsorbents. Yalcin's research on commercial activated carbon shows that it can reach 95% adsorption rate (Yalcin M, Arol A I.Gold cyanide adsorption characteristics of activated carbon of non-coconut) for gold content of 100mg / L (0.51mmol / L) solution shell origin [J]. Hydrometallurgy, 2002, 63: 201-206.). The activated carbon with magnetization treatment invented by Wang Chonglin (CN1062302) is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26C22B3/24C22B11/00
CPCY02P10/20
Inventor 李新贵王海燕黄美荣
Owner TONGJI UNIV
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