A method for electrocatalytic reduction dechlorination of wastewater containing chlorinated organic pollutants

A technology of organic pollutants and electrocatalysis, applied in the fields of water pollutants, chemical instruments and methods, water/sewage treatment, etc. Pollution, reduced reactivity of polymetallic systems, etc., to achieve the effect of treatment time period, high selectivity, and mild reaction

Active Publication Date: 2021-04-20
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the progress of the reaction, this kind of method gradually forms a metal hydroxide or carbonate passivation layer on the surface of the active metal, which cannot continuously and efficiently provide strong reducing atomic hydrogen [H], so that the reactivity of the multi-metal system continues to decrease. There are serious deficiencies in long-term performance, and there are problems such as secondary pollution of metal corrosion oxide sludge

Method used

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  • A method for electrocatalytic reduction dechlorination of wastewater containing chlorinated organic pollutants
  • A method for electrocatalytic reduction dechlorination of wastewater containing chlorinated organic pollutants
  • A method for electrocatalytic reduction dechlorination of wastewater containing chlorinated organic pollutants

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Effect test

Embodiment 1

[0037] (1) if figure 1 Shown, will connect the graphite electrode 2 of power source 4 and the C-Pd-Ag / g-C that the present invention method prepares respectively 3 N 4 The composite electrode 3 is placed in the anode chamber 6 and the cathode chamber 7 respectively, and the anode chamber 6 and the cathode chamber 7 are separated by a cation permeable membrane 5; (2) take 3-chlorophenol solution, add H according to the proton ratio of 1:0.4 2 SO 4 , according to the concentration of 30 ~ 100mmol / L to add Na 2 SO 4 Configure the electrolyte, enter the cathode chamber 7 from the cathode chamber inlet 9, and the liquid before and after electrolysis is separated by the separator 1; (3) get the same Na as the electrolyte 2 SO 4 Concentration of Na 2 SO 4 The solution enters the anode chamber 6 from the anode chamber inlet 10, and the liquid level is adjusted to be close to the cathode chamber 7; (4) the voltage of the power supply 4 is set to 1.5V, and the power supply 4 is...

Embodiment 2

[0039] In the CEH bleaching process, the waste water from the C-section and E-section contained more toxic organic substances, and a variety of chlorophenols and chlorinated guaiacols were detected. Section H contains less toxic organic substances, and no toxic substances such as chlorophenols and chlorinated guaiacols can be detected.

[0040] (1) if figure 1 Shown, will connect the graphite electrode 2 of power source 4 and the C-Pd-Ag / g-C that the present invention method prepares respectively 3 N 4 The composite electrode 3 is placed in the anode chamber 6 and the cathode chamber 7 respectively, and the anode chamber 6 and the cathode chamber 7 are separated by a cation permeable membrane 5; (2) take CEH bleaching wastewater, add H 2 SO 4 , according to the concentration of 30 ~ 100mmol / L to add Na 2 SO 4 Configure the electrolyte, and put into the cathode chamber 7; (3) get the same Na as the electrolyte 2 SO 4 Concentration of Na 2 SO 4 The solution is put int...

Embodiment 3

[0042] Among the AOX detected in ECF bleaching wastewater, chlorophenols and chlorinated hydrocarbons contained the most, and these two types of substances accounted for about 60%. The others were mainly various chlorine-containing acids, furanones, aldehydes and ketones.

[0043] (1) if figure 1 Shown, will connect the graphite electrode 2 of power source 4 and the C-Pd-Ag / g-C that the present invention method prepares respectively 3 N 4 The composite electrode 3 is placed in the anode chamber 6 and the cathode chamber 7 respectively, and the anode chamber 6 and the cathode chamber 7 are separated by a cation permeable membrane 5; (2) take the ECF bleaching wastewater, add H according to the proton ratio of 1:0.4 2 SO 4 , according to the concentration of 30 ~ 100mmol / L to add Na 2 SO 4 Configure the electrolyte, and put into the cathode chamber 7; (3) get the same Na as the electrolyte 2 SO 4 Concentration of Na 2 SO 4 The solution is put into the anode chamber 6, ...

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Abstract

The invention discloses a method for electrocatalytic reduction and dechlorination of wastewater containing chlorinated organic pollutants. A graphite electrode and a C-Pd-Ag / g-C 3 N 4 The composite electrodes are placed in the anode chamber and the cathode chamber respectively, and the anode chamber and the cathode chamber are separated by a cation permeable membrane; the wastewater containing chlorinated organic pollutants is taken, and proton H is added. 2 SO 4 and electrolyte Na 2 SO 4 Configure the electrolyte and put it into the cathode chamber; then take the same concentration of Na as the electrolyte 2 SO 4 The solution is placed in the anode chamber, and the liquid level is adjusted to be close to the cathode chamber; finally, a DC voltage of 1.5-7.0V is connected to carry out electrocatalytic reduction and dechlorination. The method of the invention has simple reaction mechanism, no secondary pollution problems such as metal corrosion in the dechlorination process, good long-term effect and low operation cost. To achieve green, efficient, rapid and continuous dechlorination of chlorinated organic pollutants in wastewater, to eliminate or reduce the toxicity of wastewater and to retain the recyclability of biomass anaerobic microorganisms in wastewater.

Description

technical field [0001] The invention belongs to the technical field of water pollutant treatment, in particular to an electrocatalytic reduction dechlorination method for wastewater containing chlorinated organic pollutants. Background technique [0002] Chlorinated organic pollutants are the main source of persistent organic pollutants (POPs) due to their stable chemical properties. A considerable part is listed by the US EPA (Environmental Protection Agey) as an environmental priority control pollutant. If it enters the environment without proper treatment, it will cause long-term threats to human health and the ecological environment. Therefore, the treatment technology of chlorinated organic pollutants has increasingly attracted global attention. . However, it is difficult for chlorinated organic pollutants to lose electrons, and chlorine atoms have high electronegativity. With the increase of chlorine substituents, the difficulty of electrophilic reaction increases, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/72C02F101/36
CPCC02F1/46104C02F1/46109C02F1/725C02F2001/46133C02F2001/46142C02F2101/36C02F2201/46115
Inventor 李许生郭珍妮张琦杨关飞钟琳陶创覃程荣王双飞宋雪萍梁辰王志伟聂双喜何辉沙九龙方丹莉李研强
Owner GUANGXI UNIV
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