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Poly (m-phenylene diamine) used as mercury ion adsorbent

A technology of poly-m-phenylenediamine and mercury ions, which is applied in the direction of adsorption of water/sewage treatment, water/sludge/sewage treatment, water pollutants, etc. It can solve the problem of dependence on import of monomers, high preparation costs, and cumbersome synthesis steps, etc. problems, to achieve the effects of shortened equilibrium adsorption time, high saturated adsorption capacity, and simple synthesis process

Inactive Publication Date: 2007-10-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the synthesis process is also lengthy and cumbersome
[0005] A mercury ion adsorbent disclosed by the applicant, poly-1,8-naphthalene diamine, has a simple and convenient synthesis process, and is a new type of high-efficiency and ultra-large-capacity mercury ion adsorbent (CN1803276), with a saturated adsorption capacity of up to 2863mg / g , but its adsorption equilibrium time for high-concentration mercury ions is as long as 50 hours, and the monomers used in the synthesis depend on imports, which is not conducive to large-scale domestic industrial applications
[0006] From the above review, it can be found that the currently synthesized adsorbents are either cumbersome in synthesis steps and high in preparation costs; Adsorbents with fast and efficient adsorption performance are very important

Method used

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  • Poly (m-phenylene diamine) used as mercury ion adsorbent
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  • Poly (m-phenylene diamine) used as mercury ion adsorbent

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1: prepare polym-phenylenediamine

[0015] Dissolve 0.08mol (8.652g) of monomeric m-phenylenediamine in 200mL of distilled water, sonicate for 3 to 5 minutes to promote its full dissolution, then place the monomer solution in a water bath at 30°C and equilibrate for half an hour. 0.08 mol of oxidant ammonium persulfate (mass 18.256 g) was dissolved in 100 mL of distilled water, which was also maintained at 30°C. This ammonium persulfate solution was added to the above monomer solution. React for 24 hours, filter with suction, and wash the product in the funnel with distilled water until it is washed with BaCl 2 The solution was tested to be free of sulfate ions. After washing, it was sucked dry, and the product was dried at 50° C. for 3 days to obtain poly-m-phenylenediamine. Weighed and calculated yield was 74.3%.

[0016] The present invention adopts static adsorption method (or claims batch method) to utilize polym-phenylenediamine to adsorb mercury io...

Embodiment 2

[0024] Take 50 mg of poly-m-phenylenediamine and put it into 25 mL of mercuric nitrate solution at 30 °C with an initial concentration of 1.99 mmol / / L and stir and adsorb for 1 minute. After filtering through filter paper, titrate the content of mercury ions in the filtrate by Volhard method. Under this condition, the adsorption rate is 62.2%, and the adsorption capacity is 124.1 mg / g. Under the same conditions, changing the adsorption time to 5 minutes, 10 minutes, 15 minutes, and 30 minutes respectively, the obtained adsorption capacities were 164mg / g, 194.3mg / g, 197mg / g, 199mg / g, and the adsorption rates were 82.2%, 97.4%, 98.7%, 99.6%.

[0025] Thus, the equilibrium adsorption time when polym-phenylenediamine adsorbs mercury ions with an initial mercury ion concentration of 1.99mmol / / L is 10 minutes, and the adsorption kinetics simulation is carried out with the pseudo-second-order kinetic equation, and the simulated correlation coefficient is 0.9996, The standard deviati...

Embodiment 3

[0027] Take 50 mg of poly-m-phenylenediamine and put it into 25 mL of mercuric nitrate solution at 30 °C with an initial concentration of 4.00 mmol / / L and stir and adsorb for 1 minute. After filtering through filter paper, titrate the content of mercury ions in the filtrate by the Volhard method. The results show that, Under this condition, the adsorption rate is 66.05%, and the adsorption capacity is 265.0 mg / g. Under the same conditions, changing the adsorption time to 5 minutes, 15 minutes, 30 minutes, and 120 minutes respectively, the obtained adsorption capacities were 319mg / g, 373mg / g, 380mg / g, 380mg / g, and the adsorption rates were 79.5%, 93.1%, respectively. %, 94.6%, 94.6%.

[0028] Thus, the equilibrium adsorption time when polym-phenylenediamine adsorbs mercury ions with an initial mercury ion concentration of 4.00 mmol / / L is 20 minutes, and the adsorption kinetics simulation is carried out with the pseudo-second-order kinetic equation, and the simulated correlation...

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Abstract

The invention discloses a novel use of poly(m-phenylenediamine) as a mercury iron sorbent with low cost and simple synthesis technology, in addition, the poly(m-phenylenediamine) has rapid adsorbing speed for mercury iron at normal temperature, capable of reaching adsorption equilibrium for a short time. Furthermore, the sorbent has a saturated adsorption capacity higher than most of synthetical mercury iron sorbents reported so far. Accordingly, the poly(m-phenylenediamine) sorbent has great latent great value in application, after the cost of material and manufacturing and adsorption properties are comprehensively considered.

Description

technical field [0001] The present invention relates to the application technical field of poly-m-phenylenediamine. Background technique [0002] Because mercury poses a huge threat to ecological security and human health, mercury must be removed from wastewater generated by industries such as metal smelting, chlor-alkali production, metal processing, and electroplating before it can be discharged into the environment. The traditional methods for treating mercury-containing wastewater are chemical precipitation, electrolysis, metal reduction, solvent extraction, evaporation, etc. These methods are not suitable for treating mercury-containing wastewater due to the narrow concentration range of mercury solution or high cost and energy consumption. efficient method. Recently, adsorption method has attracted more and more attention as an efficient treatment method for industrially applicable mercury-containing wastewater. [0003] The key to the effectiveness of the adsorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26C02F1/28C02F101/20
Inventor 黄美荣陶涛李新贵
Owner TONGJI UNIV
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