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Novel cyanide detoxification method synergistically mediated by superoxide free radicals and hydroxyl free radicals

A technology of free radicals and cyanide, applied in chemical instruments and methods, water treatment of special compounds, water pollutants, etc., can solve problems such as inability to detoxify cyanide, and achieve the effect of overcoming contradictions

Active Publication Date: 2021-11-26
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The generated cyanate is a weak salt, and its hydrolysis will be inhibited under strong alkali conditions, resulting in the failure of the rate-limiting step 2, and the complete detoxification of cyanide cannot be achieved.

Method used

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  • Novel cyanide detoxification method synergistically mediated by superoxide free radicals and hydroxyl free radicals
  • Novel cyanide detoxification method synergistically mediated by superoxide free radicals and hydroxyl free radicals
  • Novel cyanide detoxification method synergistically mediated by superoxide free radicals and hydroxyl free radicals

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Take Mn 2 o 3 The nickel foam is used as the anode electrode material, and the activated ACF is used as the cathode electrode material to construct the novel electro-Fenton catalytic system proposed by the present invention. Taking the common ferricyanide in the actual cyanide-containing wastewater as the treatment object, the 0.25mM potassium ferricyanide solution was photolyzed for 80 minutes to break the complex, and then the free cyanide solution was obtained by filtration, and the sodium sulfate solution was used as the electrolyte, at 10mA / cm 2 The electrochemical reaction was performed at a current density of 120 min, and samples were taken every 20 minutes during the reaction, and the product distribution in the sample was immediately determined. By analyzing the content changes of various products in the solution, the catalytic degradation effect of the system on cyanide was analyzed.

[0047] The specific preparation method of the electrode material in this ...

Embodiment 2

[0051] with Fe 3 o 4 The nickel foam is used as the anode electrode material, and the activated carbon felt is used as the cathode electrode material to construct the novel electro-Fenton catalytic system proposed by the present invention. Taking the common cobalt cyanide in the actual cyanide-containing wastewater as the treatment object, the 0.25mM cobalt cyanide solution is photolyzed for 150min to break the complex, and then the free cyanide solution is obtained by filtration, and the sodium sulfate solution is used as the electrolyte, at 20mA / cm 2 The electrochemical reaction was performed at a current density of 360 minutes, and samples were taken every 60 minutes during the reaction, and the product distribution in the samples was immediately determined. By analyzing the content changes of various products in the solution, the catalytic degradation effect of the system on cyanide was analyzed.

[0052] The specific preparation method of the electrode material in this ...

Embodiment 3

[0056] With Co 3 o 4 / FTO is the anode electrode material, and the activated ACF is the cathode electrode material to construct the novel electro-Fenton catalytic system proposed by the present invention. Taking the common copper cyanide in the actual cyanide-containing wastewater as the treatment object, the 0.40mM copper cyanide solution is photolyzed for 50 minutes to break the complex, and then the free cyanide solution is obtained by filtration, and the sodium sulfate solution is used as the electrolyte, at 10mA / cm 2 The electrochemical reaction was performed at a current density of 90 min, and samples were taken every 15 minutes during the reaction, and the product distribution in the sample was immediately determined. By analyzing the content changes of various products in the solution, the catalytic degradation effect of the system on cyanide was analyzed.

[0057] The specific preparation method of the electrode material in this example is as follows:

[0058] Anod...

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Abstract

The invention discloses a novel cyanide detoxification method synergistically mediated by superoxide free radicals and hydroxyl free radicals. Complex cyanide in cyanide-containing wastewater is broken through ultraviolet irradiation, filtering is carried out obtain a free cyanide solution, the free cyanide solution is subjected to electrochemical treatment through an electro-Fenton catalysis system capable of generating .O2 <-> and .OH at the same time, the electrochemical reaction is conducted under the strong alkaline condition, a cathode in the electro-Fenton catalysis system generates . O2 <-> and hydrogen peroxide, an anode efficiently activates the hydrogen peroxide generated by the cathode into .OH, the .OH firstly activates the cyanide into a .CN intermediate state species in an electron-deficient state, then .CN and .O2<-> are subjected to a nucleophilic addition reaction, the cyanide is further converted into a non-toxic product nitrate, the defect that the cyanide can only be converted into low-toxicity cyanate in a traditional cyanide detoxification process is overcome, and a new path for complete detoxification of the cyanide is developed.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a new method for cyanide detoxification mediated by superoxide free radicals and hydroxyl free radicals. Background technique [0002] With the development of science and technology and the improvement of industrial level, cyanide, as an important chemical raw material, is widely used in industrial processes such as metallurgy, electroplating and coking, making these industries produce a large amount of toxic cyanide-containing wastewater. Because cyanide has a strong ability to complex metals, cyanide in cyanide-containing wastewater mainly exists in the form of cyanide complex. For the discharge of cyanide-containing wastewater, the state has formulated strict discharge concentration standards. Wastewater Comprehensive Discharge Standard (GB8978-1996) stipulates that the maximum total cyanide concentration allowed to be discharged is: the first and second level standa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/18
CPCC02F9/00C02F1/32C02F1/001C02F1/4672C02F2001/46133C02F2305/023C02F2101/18Y02W10/37
Inventor 邹建平唐倩倩田磊刘虎张龙帅
Owner NANCHANG HANGKONG UNIVERSITY
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