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Aniline copolymers and methods for their preparation and use

a copolymer and aniline technology, applied in water/sludge/sewage treatment, specific water treatment objectives, chemical instruments and processes, etc., can solve the problems of limited application of traditional methods for heavy metal wastewater treatment, and challenge in the treatment of heavy metal pollution

Inactive Publication Date: 2012-11-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]In some embodiments, the metal ion is a heavy metal ion. In some embodiments, the metal ion is Pb(II) or Hg(II). In some embodiments, the metal ion is a noble metal ion. In some embodiments, the metal ion is Ag(I). In some embodiments, the metal ion is selected from the group consisting of Cd(II), Cu(II), Zn(II), Pb(II), Hg(II), and Fe(III). In some embodiments, the untreated sample is wastewater. In some embodiments, the concentration of the metal ion in the untreated sample is no more than about 200 g/L. In some embodiments, the concentration of the metal ion in the untreated sample is from about 1 ng/L to about 200 mg/L. In some embodiments, the concentration of the metal ion in the untreated sample is higher than the concentration of the metal ion in the treated sample. In some embodiments, the concentration of the metal ion in the untreated sample is at least about 5 times higher than the concentration of the metal ion in the treated sample. In some embodiments, the concentration of the metal ion in the untreated sample is at least about 10 times higher than the concentration of the metal ion in the treated sample. In some embodiments, the concentration of the metal ion in the untreated sample is at least about 20 times higher than the concentration of the metal ion in the treated sample. In some embodiments, the concentration of the metal ion in the

Problems solved by technology

The treatment of heavy metal pollution is challenge for environmental protection.
Traditional methods for heavy metal wastewater treatment, such as chemical precipitation, electrolytic process, extraction separation, and membrane separation, are limited in their applications because of the inability to detect metal ions at low concentrations.

Method used

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  • Aniline copolymers and methods for their preparation and use
  • Aniline copolymers and methods for their preparation and use
  • Aniline copolymers and methods for their preparation and use

Examples

Experimental program
Comparison scheme
Effect test

example 1

Polymerization of Aniline (AN) and 2-hydroxy-5-sulfonic aniline (HSA)

[0077]The chemical oxidative polymerization of Aniline (AN) and 2-hydroxy-5-sulfonic aniline (HSA) for the synthesis of An / HSA copolymers was carried out in a typical synthesis procedure described below.

[0078]A typical synthesis procedure of AN / HSA copolymers included adding 0.729 mL AN and 0.378 g HSA so that the molar ratio of the AN monomer to the HSA monomer (AN / HSA molar ratio) was about 20:80, and mixing AN and HSA in a 200-mL glass flask which contained 100 mL HCl solution with concentration of 1M. Next, 2.28 g oxidant ammonium persulfate was dissolved separately in 50 mL of distilled water to prepare as an oxidant solution. The oxidant solution was gradually dropped into the mixed monomer solution at a rate of one drop of every 3 seconds at 25° C. with a final monomer components / oxidant molar ratio of 1:1. The reaction mixture was vigorously magnetically stirred for 24 hour at 30° C. When the synthetic proc...

example 2

Modifying Polymerization Conditions

[0079]Additional AN / HSA copolymers were prepared using the typical procedures described in Example 1. However, in one set of experiments, AN / HSA molar ratio varied from 100:0 to 70:30 (i.e., HSA feed content was increased from 0% to 30%). The synthetic yields of those AN / HSA copolymers were determined based on the weight of the copolymer. The bulk electrical conductivity of the pressed copolymer pellet sheets with the thicknesses of 0.20 mm and a constant efficient area of 0.785 cm2 was examined by a two-disk method at room temperature with a UT 70A multimeter. The results are shown in FIG. 1.

[0080]FIG. 1 shows that an increase in the HSA feed content leads to a reduction in the synthetic yield and the electrical conductivity of the AN / HSA copolymer. Also, as compared to polyaniline homopolymer, the bulk electrical conductivity of the AN / HSA copolymer does not change significantly when the molar ratio of the HSA monomer to the AN monomer is changed...

example 3

Solubility Property of AN / HSA Copolymers

[0081]Additional AN / HSA copolymer particles were prepared using generally the same procedures described in Example 1. However, AN / HSA molar ratio was 95:5, 90110, 80 / 20, and 70:30, respectively. Chemoresistance of the copolymer particles was evaluated using a typical procedure including: adding 5 mg copolymer powders into 1 mL solvent and dispersing the mixture thoroughly; and characterizing the solubility of the copolymer after swaying the mixture continuously for 24 hours at room temperature. The solubility of the AN / HSA copolymer particles in various solvents was examined, and the results are summarized in Table 1.

[0082]As shown in Table 1, the AN / HSA copolymer particles maintain good resistance to most of organic solvents, and are tolerant to acid solution. In addition, the solubility of the copolymer particles changed significantly when HSA / AN molar ratio is more than 20:80. For example, those copolymer particles are slightly soluble in w...

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Abstract

Aniline copolymers and methods of making these copolymers are disclosed herein. The copolymers can, for example, be used for removing metal ions from a sample.

Description

BACKGROUND[0001]1. Field[0002]The present application relates to compositions and methods for removal of metal ions from a sample.[0003]2. Description of the Related Art[0004]The treatment of heavy metal pollution is challenge for environmental protection. Heavy metals, for example some toxic metal ions such as Hg(II), Pb(II), Cd(II), Cr(III, VI), can cause serious damages to living organisms. Traditional methods for heavy metal wastewater treatment, such as chemical precipitation, electrolytic process, extraction separation, and membrane separation, are limited in their applications because of the inability to detect metal ions at low concentrations. There is a need for potent adsorbents that remove metal ions from a sample.SUMMARY[0005]Some embodiments disclosed herein include a copolymer having at least one optionally substituted 2-hydroxy-5-sulfonic aniline as a first monomer unit and at least one aniline as a second monomer unit.[0006]In some embodiments, the first monomer unit...

Claims

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Application Information

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IPC IPC(8): C08G73/02
CPCB01J20/262B01J20/264B01J20/345C02F1/285C02F1/38C02F2101/20C02F2101/203C02F2101/22C02F2103/16C02F2303/16
Inventor HUANG, MEIRONGFENG, HAOLI, XINGUI
Owner TONGJI UNIV