Novel high effective noble metal adsorbent and its preparing method

An adsorbent and precious metal technology, applied in the field of novel high-efficiency precious metal adsorbent and its preparation, can solve the problems of complex preparation, difficult market application of adsorbent resin, and many synthesis steps.

Inactive Publication Date: 2008-04-30
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, due to the specific structural requirements of synthetic adsorption resins, many synthetic steps are involved, and multi-step organic synthesis and polymerization reactions are required. The yield of the final product is low, and the preparation of some monomers in the middle is also relatively complicated. It has caused difficulties for the final market application of this kind of adsorbent resin

Method used

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  • Novel high effective noble metal adsorbent and its preparing method
  • Novel high effective noble metal adsorbent and its preparing method
  • Novel high effective noble metal adsorbent and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Weigh 40.0 g of low-crosslinking polystyrene resin prepared by suspension polymerization, swell in 0.15 L of ethanol, and react with chloromethyl ether to realize chloromethylation. The introduction of the chloromethyl group was characterized by NMR. Characterize the chlorine content with elemental analysis; (2) react chloromethyl with aminoethanethiol (50% aqueous solution, 70mL), adjust the pH value to 7, and the reaction temperature is 40~60°C; (3) take the above reaction product 20.0 g, join CS 2 (100.0g) and NaOH aqueous solution (10%, 40mL) continued to react for 4 hours, the product was taken out, filtered, acid washed, washed with water, and dried to obtain the adsorbent. The product is characterized by nuclear magnetic resonance, infrared spectroscopy, and elemental analysis. Its basic structural formula is:

[0022]

[0023] Among them, the surface of styrene beads can carry multiple adsorption groups, and the left figure is only a schematic diagram. ...

Embodiment 2

[0026] (1) Get 40.0 g of low-crosslinking polystyrene resin obtained by suspension polymerization, swell in N, N'-dimethylformamide (0.10 L) and react with chloromethyl ether to realize chloromethylation; (2 ) chloromethyl reacts with aminoethanethiol (50% ethanol solution, 75mL), adjusts the pH value to 7, and the reaction temperature is 40-60°C; (3) Take 20.0g of the above reaction product, add CS 2 (80.0g) and NaOH aqueous solution (5%, 60mL) continue to react after 4 hours, take out product, filter, pickle, wash with water, dry to obtain product (same as embodiment 1).

[0027] The adsorbent adsorbs gold solutions with different pH values ​​(4-10), and then desorbs, and measures the gold purity after desorption. Experiments show that under different pH values, the amount of gold adsorbed in the electroplating solution wastewater is basically the same, the gold purity is 99%, and the resin can be reused.

Embodiment 3

[0029] (1) Take 40.0g of polystyrene resin, swell in dioxane (0.13L) and react with chloromethyl ether to realize chloromethylation; (2) chloromethyl and aminopropanethiol (50% aqueous solution, 75mL) reaction, adjust the pH value to 7, the reaction temperature is 40 ~ 60 ℃; (3) take 20.0g of the above reaction product, add CS 2 (80.0g) and NaOH aqueous solution (5%, 60mL) continue to react after 4 hours, take out product, filter, pickle, wash with water, after drying, obtain product (same as embodiment 1). The resin adsorbs gold solutions with different pH values ​​(4-10), and then desorbs, and measures the gold purity after desorption. Experiments show that under different pH values, the amount of gold adsorbed in the electroplating solution wastewater is basically the same, the gold purity is 99%, and the resin can be reused.

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Abstract

The present invention relates to the design and synthesis method of adsorbing resin, and by means of special polymerization method, small crosslinked polystyrene ball is made to possess proper geometric features and maximized function. By means of proper design, the synthesis steps are reduced, and functional radical contains special reactive functional groups capable of adsorbing noble metal. One functional molecule contains four adsorbing groups. The obtained adsorbent has excellent noble metal adsorbing performance and selectivity under different pH conditions, and may be used in the adsorption and recovery of noble metal in different fields.

Description

technical field [0001] The invention relates to the design and synthesis method of an adsorption resin, in particular to a novel high-efficiency precious metal adsorbent and a preparation method thereof. Background technique [0002] Among the polymer chelating agents, the most researched in the past is the dicarboxylic acid type (EDTA type) resin, which has achieved practical applications in the separation and enrichment of alkaline earth metals and the first series of transition metals. However, there are few studies on the adsorption resins used to adsorb precious metals. There are two main categories reported in the literature: 1. Adsorption resins with polymers as the carrier and functional groups on the side groups. Such as Reactive&Functional Polymers 1996(31): 117-136, K-D.TOPP, resin containing resonance diamine structure reported by M.Grote et al., J.Appl.Polym.Sci, 2001(82): 3127-3132, LaiHuaNi, ChangHaiYi etc. propose thiourea resin and Hubei chemical industry, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26C22B3/24C22B11/00
CPCY02P10/20
Inventor 路建美
Owner SUZHOU UNIV
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