Method for selectively removing Fe<2+> and/or Fe<3+> from industrial waste water through electric adsorption technology

An industrial wastewater, electro-adsorption technology, applied in chemical instruments and methods, separation methods, water/sewage treatment, etc., to achieve the effects of no secondary pollution, low cost, and convenient and quick recovery

Active Publication Date: 2015-05-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been reports on the use of electrodes containing porous carbon materials as supercapacito

Method used

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  • Method for selectively removing Fe&lt;2+&gt; and/or Fe&lt;3+&gt; from industrial waste water through electric adsorption technology
  • Method for selectively removing Fe&lt;2+&gt; and/or Fe&lt;3+&gt; from industrial waste water through electric adsorption technology
  • Method for selectively removing Fe&lt;2+&gt; and/or Fe&lt;3+&gt; from industrial waste water through electric adsorption technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a. Configure a multi-cation mixed solution to simulate industrial wastewater: take 16mg of potassium chloride, 44mg of magnesium chloride hexahydrate and 58mg of ferric chloride hexahydrate and three metal chloride salts in a 500ml volumetric flask, add deionized water to balance to the scale Wire. The molar concentration of each metal ion is 0.4mmol / L-0.5mmol / L, and the measured electrical conductivity of the above-mentioned simulated wastewater is 200 microSiemens / cm-300 microSiemens / cm;

[0025] b. Take 100ml of the polycation mixed solution of step a into a beaker and set aside;

[0026] c. Mix the nitrogen-doped nano-microporous carbon material, conductive carbon black and binder in a ratio of 80:15:5 by mass, then dissolve in an equal mass of absolute ethanol and ultrasonically form a suspension, and suspend the The liquid is evenly dropped on the current collector as a working electrode, wherein the current collector can be graphite paper or titanium sheet, and ...

Embodiment 2

[0030]Referring to the method in Example 1, the substances in the multication mixed solution configured in Example 1 step a are changed to 63.5mg sodium chloride, 67.1mg copper chloride dihydrate, 72.6mg ferric chloride hexahydrate and 35.6mg tetrachloride Ferric dichloride hydrate Four metal chloride salts, Na + 、Cu 2+ And the mass concentration of total iron ions is 9mg / L-10mg / L. Obtain the curve graph of the concentration of various metal ions in the multi-cation mixed solution changing with time during the adsorption and desorption process, such as figure 2 shown.

[0031] Depend on figure 2 It can be seen that in the adsorption stage, the adsorption rate of total iron ions is higher than that of Na + and Cu 2+ , while in the desorption stage, almost all of the Na adsorbed to the electrode material + and Cu 2+ All of them are desorbed and returned to the multi-cation mixed solution, while the total iron ions have not been desorbed and remain in the material, so as...

Embodiment 3

[0033] Referring to the method in Example 1, the material in the multication mixed solution configured in Example 1 step a is changed to three metal chloride salts of 9mg lithium chloride, 44mg magnesium chloride hexahydrate and 58mg iron trichloride hexahydrate, each metal The ion molar concentration is 0.4mmol / L-0.5mmol / L. Obtain the curve graph of the concentration of various metal ions in the multi-cation mixed solution changing with time during the adsorption and desorption process, such as image 3 shown.

[0034] Depend on image 3 It can be seen that during the adsorption stage, Fe 3+ The adsorption rate is higher than that of Li + and Mg 2+ , while in the desorption stage, almost all Li adsorbed into the electrode material + and Mg 2+ are desorbed back into the multi-cation mixed solution, while Fe 3+ has not been desorbed and remains in the material, thus reaching the Fe 3+ separation from other ions.

[0035] In the present invention, the nitrogen-doped nan...

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Abstract

The invention discloses a method for selectively removing Fe<2+> and/or Fe<3+> from industrial waste water through an electric adsorption technology. The industrial waste water contains Fe<2+> and/or Fe<3+> and other metal ions except the Fe<2+> and the Fe<3+>. The method uses nitrogen-sodium doped microporous carbon materials as electric adsorption electrode materials and comprises the following steps: (a) an adsorption process, wherein a voltage is applied to electrodes, so that the electric adsorption electrode materials adsorb various metal ions in the industrial waste water; (b) a desorption process, wherein the voltage applied to the electrodes is removed or reversely connected, so that the Fe<2+> and the Fe<3+> which are adsorbed on the electric adsorption electrode materials are not desorbed, and other metal ions are desorbed. The method disclosed by the invention has the advantages of being simple in operation, low in cost, low in energy consumption, free of secondary pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of electric adsorption water treatment. It specifically relates to a selective removal of Fe from industrial wastewater by electro-adsorption technology. 2+ and / or Fe 3+ Methods. Background technique [0002] With the rapid development of the electronics industry, the output of printed circuit boards is increasing day by day. Ferric chloride solution is widely used to corrode printed circuit boards due to its relatively low price. During the corrosion process, ferric chloride is reduced to ferric chloride, and divalent copper ions are produced at the same time. In order to recover copper from the waste liquid after corroding printed circuit boards, a method of removing Fe is needed. 2+ and / or Fe 3+ method of interference. At the same time, in the production process of many metal products, a large amount of waste liquid will be discharged into rivers, and these waste liquids often contain a large amount...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F1/64
Inventor 常铮朝鲁蒙孙晓明雷晓东
Owner BEIJING UNIV OF CHEM TECH
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