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Copolymer of amino-benzene and 2-methy-oxy-5-sulfonic acid used as mercury ion adsorbant

A technology of methoxyaniline and copolymer, which is applied in the field of polyaniline as an adsorbent, can solve problems such as the cost-effectiveness to be improved, and achieve the effects of improving complexing ability, simple and easy synthesis process, and expanding application space.

Inactive Publication Date: 2007-11-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most efficient mercury ion adsorbent that has been reported so far is poly-1,8-naphthalene diamine (CN1803276), and its maximum saturated adsorption capacity can reach 2863 mg / g. However, the monomers required for the synthesis of this adsorbent depend on foreign imports. Cost performance needs to be improved

Method used

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  • Copolymer of amino-benzene and 2-methy-oxy-5-sulfonic acid used as mercury ion adsorbant
  • Copolymer of amino-benzene and 2-methy-oxy-5-sulfonic acid used as mercury ion adsorbant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0017] Accurately measure 0.05 mol of aniline, weigh 0.05 mol of 2-methoxyaniline-5-sulfonic acid, place it in a 250 mL dry and clean beaker, add 75 mL of 1.0 mol / L hydrochloric acid aqueous solution, stir at 25°C until completely dissolved, and obtain colorless solution. Weigh another 0.1mol (NH 4 ) 2 S 2 o 8 Dissolve in 25mL of 1 mol / L hydrochloric acid aqueous solution, stir in a water bath at constant temperature until completely dissolved, and obtain a colorless and transparent solution. Add dropwise (NH 4 ) 2 S 2 o 8 The solution was added to the monomer mixture, and after the dropwise addition was completed, the reaction was continued for 24 hours. After the reaction is completed, wash with deionized water 2 to 3 times until washed with BaCl 2 Solution test clear solution without SO 4 2- ion so far. The product was transferred to a watch glass, and dried at 40°C for one week to constant weight to obtain a dark gray doped copolymer powder with a copolymerizat...

Embodiment 8～13

[0026] Take 50mg 50 / 50 PAN / MAS and put it into 25mL mercury nitrate solution with an initial concentration of 5.938mmol / L at 30°C and stir and adsorb for 24 hours. Under this condition, the adsorption capacity is 600 mg / g, and the adsorption rate is 94.2%. Under the same conditions, the adsorption experiments were carried out using PAN / MAS copolymers with molar ratios of 80 / 20, 70 / 30, 60 / 40, 30 / 70, and 20 / 80, and the adsorption capacities were 420.5mg / g, 527.6mg / g, 562.1mg / g, 582.2mg / g, 576.4mg / g corresponding adsorption rates are 66.1%, 82.9%, 88.3%, 97.8%, 91.5%, respectively.

[0027] As a comparison, under the same conditions, the adsorption capacity of polyaniline is 380.2mg / g, and the adsorption rate is 59.7%, obviously lower than that of copolyaniline.

Embodiment 14～18

[0029] Take 50mg 50 / 50PAN / MAS and put it into 25mL mercury nitrate solution with an initial concentration of 1.99mmol / L at 30°C and stir for 5 minutes. Under these conditions, the adsorption capacity is 148.4 mg / g, and the adsorption rate is 74%. Under the same conditions, changing the adsorption time to 15 minutes, 30 minutes, 1 hour, and 2 hours respectively, the resulting adsorption capacities were 186.7mg / g, 193.7mg / g, 195.4mg / g, and 198.7mg / g, and the adsorption rates were 93.1%, 96.5%, 97.4%, 99.6%.

[0030] Thus, it can be obtained that the equilibrium adsorption time for 50 / 50PAN / MAS adsorption of mercury ions with an initial mercury ion concentration of 1.99mmol / L is 1 hour, and the adsorption kinetics simulation is carried out with the pseudo-second-order kinetic equation, and the simulated correlation coefficient is 0.99898, the standard The deviation is 0.01239. The initial adsorption rate constant h obtained by simulation is 177.6mg / (g.min).

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Abstract

The present invention relates to an application of copolymer of benzenamine and 2-anisidine-5-sulfoacid as mercury ion adsorbing agent. Said invention utilizes the copolymerization of benzenamine and 2-anisidine-5-sulfoacid, on the basis of retaining original property of polyaniline can make newly-introduced methoxyl group, sulfoacid group and amino-group on the polyaniline skeleton produce action together so as to greatly raise complexation capability of polyaniline to mercury ions. Said adsorbing agent treatment initial concentration can be up to 10 mmol / L, and the removing rate of mercury ions can be up to 99.4%.

Description

technical field [0001] The invention relates to the use of polyaniline containing methoxy group and sulfonic acid group as an adsorbent. Background technique [0002] In terms of water pollution, heavy metal pollution is the most difficult to control. In particular, although mercury metal has only trace concentrations in natural water bodies, its toxicity has long-term persistence. Therefore, human drinking water has very high requirements and restrictions on the content of heavy metals. Generally, the toxicity of heavy metals ranges from 1.0 to 10 mg / L, and the concentration of heavy metals with strong toxicity, such as mercury and cadmium, ranges from 0.01 to 0.1 mg / L. It is precisely because of the above characteristics that mercury metal pollutants must be controlled and treated manually. [0003] In the industry, mercury metal treatment mostly uses chemical precipitation method to treat mercury-containing wastewater, but chemical precipitation method exists: it is ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26
Inventor 黄美荣封皓李新贵
Owner TONGJI UNIV