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Simple method for removing trace bromate ion in water

A bromate and water removal technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as complex methods, unsatisfactory removal effects, and impact on effective applications.

Inactive Publication Date: 2010-04-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a small number of studies have explored the removal of trace bromate ions in water, in general, the method is complicated, the cost is high, and the removal effect is not ideal, which largely affects its effective application in actual production.

Method used

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  • Simple method for removing trace bromate ion in water
  • Simple method for removing trace bromate ion in water
  • Simple method for removing trace bromate ion in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Prepare the reaction solution:

[0019] The sulfuric acid and the aniline monomer are stirred so that the aniline monomer content is 0.1 mol / L, and the sulfuric acid concentration is 1.2 mol / L.

[0020] 2) Electrochemical polymerization:

[0021] The three-electrode system ( figure 1 ) placed in a solution containing sulfuric acid and aniline monomer to react for 0.1 hour to carry out electrochemical polymerization. The three-electrode system includes a working electrode 1, a reference electrode 2 and a counter electrode 3. The working electrode 1 is a glassy carbon electrode, which is polished before use to achieve a potential range of -0.5~ in 0.5mol / L sulfuric acid. Maintain a stable cyclic voltammetry curve in the range of 1.0V, and then use deionized water to fully wash it, dry it and set it aside.

[0022] 3) Washing:

[0023] The obtained polyaniline film attached to the electrode is first immersed in 0.05mol / L sulfuric acid, then taken out and washed wit...

Embodiment 2

[0027] 1) Prepare the reaction solution:

[0028] Sulfuric acid and aniline monomer are stirred so that the content of aniline monomer therein is 0.5mol / L, and the concentration of sulfuric acid is 1.0mol / L;

[0029] 2) Electrochemical polymerization:

[0030] The three-electrode system ( figure 1 ) placed in a solution containing sulfuric acid and aniline monomers and reacted for 2 hours to carry out electrochemical polymerization;

[0031] 3) Washing:

[0032] The obtained polyaniline film attached to the electrode is first immersed in 0.05mol / L sulfuric acid, then taken out and washed with deionized water and dried for later use;

[0033] 4) Electrocatalytic reduction:

[0034] Immerse the obtained polyaniline membrane in a supporting electrolyte solution containing 50ppm bromate ions, and carry out cyclic voltammetry scanning in the potential range of -1.5~1.5V to achieve the purpose of reducing and removing bromate ions.

Embodiment 3

[0036] 1) Prepare the reaction solution:

[0037] Sulfuric acid and aniline monomer are stirred so that the content of aniline monomer therein is 0.8mol / L, and the concentration of sulfuric acid is 2.2mol / L;

[0038] 2) Electrochemical polymerization:

[0039] The three-electrode system ( figure 1 ) is placed in the solution containing sulfuric acid and aniline monomer and reacted for 1 hour to carry out electrochemical polymerization;

[0040] 3) Washing:

[0041] The obtained polyaniline film attached to the electrode is first immersed in 0.05mol / L sulfuric acid, then taken out and washed with deionized water and dried for later use;

[0042] 4) Electrocatalytic reduction:

[0043] Immerse the polyaniline membrane obtained in the above step 3) in a supporting electrolyte solution containing 100ppm bromate ions, and perform cyclic voltammetry scanning in the potential range of -1.5~1.5V to achieve the purpose of reducing and removing bromate ions.

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Abstract

The invention discloses a simple method for removing trace bromate ion in water. The method comprises the following steps that: a thin polyaniline film is synthesized by a constant potential mode under a proper electric potential by using a three-electrode system; and the thin polyaniline film with stable property is obtained. The thin film on the surface of the electrode has an excellent electrocatalytic activity for the bromate ion; by an electrochemical catalytic reduction reaction, the bromate ion which has the same trace amount in natural water is reduced to a national standard; and the bromate solution with higher concentration has better transferring and removing efficiencies. When pH value is equal to 6-8, and the bromate ion with initial concentration 2ppm is removed to the concentration 20 ppb. The method has the following advantages of convenience, low cost, no adjustment of pH value, and better application value and market prospect.

Description

technical field [0001] The invention relates to a method for removing carcinogens in drinking water, in particular to a convenient method for removing 2B-level carcinogens-bromate ions in drinking water by using an electrochemical reduction method. Background technique [0002] Mineral water has become a standing item that cannot be separated from people's daily life. However, mineral water disinfected with ozone is prone to produce inorganic disinfection by-products such as bromate. Studies have shown that when people drink water with traces of bromate throughout their lives, it induces higher rates of carcinogenesis. At present, bromate has been classified as a potential carcinogen of level 2B by the International Agency for Research on Cancer. In view of the harm of bromate to human body, it is more and more important to remove bromate in drinking water. Although a small number of studies have explored the removal of trace bromate ions in water, in general, the method ...

Claims

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Application Information

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IPC IPC(8): C02F1/46C02F1/70C02F1/58C02F101/12
Inventor 崔皓李琴唐荣丁亮翟建平
Owner NANJING UNIV
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