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Microspheric precious metal adsorbent and preparation method thereof

A precious metal and adsorbent technology, applied in the field of adsorption, can solve the problems of small adsorption capacity of precious metals, inconvenient use and regeneration, unfavorable use and regeneration, etc., and achieve strong practical use value, excellent adsorption performance, and excellent adsorption performance of precious metals.

Inactive Publication Date: 2012-04-04
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the chelating resins reported in the literature are in the form of powder and other amorphous forms. Although they have a large adsorption capacity for noble metals, they are inconvenient to use and regenerate.
There are also very few chelating agents that introduce chelating groups on styrene microspheres, but due to the low content of nitrogen and sulfur, the adsorption capacity for noble metals is very small
These chelating agents currently have contradictions in appearance shape and adsorption capacity. When the adsorption capacity is large, the appearance shape is mostly powdery, which is not conducive to use and regeneration. Even if it is made into microspheres, the adsorption capacity is greatly reduced. make it very difficult to apply in practice

Method used

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  • Microspheric precious metal adsorbent and preparation method thereof
  • Microspheric precious metal adsorbent and preparation method thereof
  • Microspheric precious metal adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 80ml of distilled water, 4.0g (0.037mol) of p-phenylenediamine, and 2.0g of sodium chloride together into a 250ml reaction flask, stir magnetically for 24 hours, then add 20ml of polyvinyl alcohol solution (20g / L), press thiochloride The molar ratios of propane and p-phenylenediamine are: 1:2, 1:1, 2:1 Add epithichloropropane, mechanically stir together at 25°C, heat up to 70°C after 40min, and stop the reaction after 6h.

[0019] The prepared adsorbent is soaked in acidic and alkaline solutions in sequence, extracted with acetone for 24 hours, washed with water and ethanol in sequence, and dried in vacuum at constant temperature to obtain a microspherical shape. The resulting product numbers are PAC1, PAC2, and PAC3 in sequence.

[0020] Table 1 The content of each element of the microspherical adsorbent

[0021]

[0022] Use a digital camera to take pictures of the appearance of PAC2, see the results figure 1 . Microspheres with uniform particles and regular...

Embodiment 2

[0025] Accurately weigh 0.100 g of the microspherical adsorbent prepared in Example 1, place it in a 100 ml conical flask with a stopper, add a certain concentration of metal ion solution, and vibrate in a constant temperature oscillator for 24 hours (use black to absorb Ag(Ⅰ). wrap the bottle with paper to avoid light), use an atomic absorption meter to measure the concentration of metal ions in the solution before and after adsorption, and calculate the adsorption capacity according to the following formula:

[0026] Q=(C 0 -C)V / W

[0027] Where Q is the adsorption capacity (mmol / g), C 0 is the concentration (mol / L) of metal ions before adsorption, C is the concentration (mol / L) of metal ions after adsorption, W is the dry weight of chelating agent (g), and V is the solution volume (ml).

[0028] The adsorption capacity of table 2 microsphere type adsorbent (mmol / g)

[0029]

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PUM

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Abstract

The invention discloses a microspheric precious metal adsorbent and a preparation method thereof, belonging to the technical field of adsorption. The microspheric precious metal adsorbent has uniform particles and a regular shape, contains sulfydryl and an amino group, has a space network structure, and is prepared by undergoing ring opening and condensation polymerization reactions on chloromethyl thiirane and para-phenylene diamine, suspending and polymerizing. The adsorbent is microspheric, can be filled into a columnar adsorbing device, has relatively high adsorption capacities on Au (III) and Ag (I), has high adsorbing performance on Hg (II) and Cu (II), and has relatively high practical utilization value.

Description

technical field [0001] A microsphere-type precious metal adsorbent and a preparation method thereof relate to reaction design and a synthesis method thereof, and belong to the field of adsorption technology. Background technique [0002] Because of its high adsorption capacity, low cost and easy operation, chelating agents are of great significance in recovering concentrated precious metals and removing heavy metal ions in water. For example, Xu Yuwu and others synthesized thiourea resin, and Dong Shihua et al proposed an interpenetrating network type mercaptoamine resin. Most of the chelating resins reported in the literature are in amorphous form such as powder. Although they have a large adsorption capacity for noble metals, they are inconvenient to use and regenerate. There are also very few chelating agents that introduce chelating groups on styrene microspheres, but due to the low content of nitrogen and sulfur, the adsorption capacity for noble metals is very small. ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62
Inventor 倪才华赵建平李西顺马福文
Owner JIANGNAN UNIV
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