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Method for removing micropollutants in water by activating peroxysulphate through iron electrode

A technology for activating persulfate and persulfate, applied in chemical instruments and methods, water/sewage treatment, special compound water treatment, etc., can solve problems such as low removal efficiency of micro-pollutants, impact on ecosystems, and human health. Achieve obvious cost-effective advantages, fast reaction speed, and avoid the effect of flocculation and precipitation

Inactive Publication Date: 2016-02-24
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the 1990s, PPCPs have been frequently detected in groundwater, surface water, soil, sediment, etc. Although the concentration of PPCPs is often very low, trace amounts of PPCPs can still cause adverse effects on ecosystems and human health. influences
However, the traditional coagulation, sedimentation, and filtration processes have extremely low removal efficiency for such micro-pollutants. Therefore, under the condition that drinking water sources are constantly threatened by organic micro-pollutants, it is necessary to study new and efficient methods for removing traces of refractory organic matter in water. It is of great strategic significance to the sustainable development of our country to effectively improve the quality of drinking water

Method used

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  • Method for removing micropollutants in water by activating peroxysulphate through iron electrode
  • Method for removing micropollutants in water by activating peroxysulphate through iron electrode

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Embodiment 1

[0029] This embodiment provides a method for removing micro-pollutants in water by activating persulfate with an iron electrode. The specific steps are as follows: prepare the aqueous solution containing micro-pollutants to be treated as the solution to be treated, with a volume of 200 mL and a current density of 5.0 mA / cm 2 , the rotating speed of the stirring rotor is 200r / min, the initial oxcarbazepine concentration is 20μM, and the concentration of sodium persulfate is 0.5mM (wherein, M is mol / L, and μM is 10 -6 mol / L, mM is 10 -3 mol / L, the same below), the initial pH of the solution was adjusted to 3.0 with dilute sulfuric acid, and the iron was used as the electrode to conduct electrolysis for 10 minutes, and the removal rate of oxcarbazepine reached 92%.

Embodiment 2

[0035] Prepare the solution to be treated with a volume of 200mL and a current density of 1.6mA / cm 2 , the rotor speed is 200r / min, the initial oxcarbazepine concentration is 20 μM, the potassium persulfate concentration is 0.5mM, and the initial pH of the solution is adjusted to 5.0 with dilute sulfuric acid. The removal rate of oxcarbazepine reached 75% by electrolysis with iron as electrode for 10 minutes.

Embodiment 3

[0037] The volume of the solution to be treated is 200mL, and the current density is 8.3mA / cm 2 , the rotor speed is 200r / min, the initial oxcarbazepine concentration is 20μM, the sodium hydrogen persulfate concentration is 0.5mM, and the initial pH is 7.0. The removal rate of oxcarbazepine reached 82% when the iron was used as the electrode to energize and electrolyze for 10 minutes.

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Abstract

The invention provides a method for removing micropollutants in water by activating peroxysulphate through an iron electrode. The method specifically comprises the following steps that the peroxysulphate is put into the water containing the micropollutants, power-on electrolysis is performed on the water containing the micropollutants by taking the iron electrode as an electrode, even stirring is performed, and then removal of the micropollutants is completed, wherein the mole ratio of the put quantity of the peroxysulphate to the micropollutants is 1:1-50:1. The method is high in reacting speed and easy to operate and has the obvious cost performance advantage; ferrous ions are reduced and regenerated in a cathode zone of the electrode, on one hand, it is guaranteed that reacting can be quickly and continuously performed, and on the other hand, too many flocculent precipitates are prevented from being generated while a certain flocculation effect is guaranteed.

Description

technical field [0001] The invention relates to a method for removing micro-pollutants in water by activating persulfate with an iron electrode, and belongs to the technical field of water treatment. Background technique [0002] In recent years, with the rapid development of industry and agriculture and the continuous improvement of people's living standards, toxic and harmful micro-pollutants represented by pharmaceuticals and personal care products (PPCPs) have been produced and used in large quantities around the world. Since the 1990s, PPCPs have been frequently detected in groundwater, surface water, soil, sediment, etc. Although the concentration of PPCPs is often very low, trace amounts of PPCPs can still cause adverse effects on ecosystems and human health. influences. However, the traditional coagulation, sedimentation, and filtration processes have extremely low removal efficiency for such micro-pollutants. Therefore, under the condition that drinking water sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/467C02F1/463
CPCC02F1/4672C02F1/463C02F2201/4618C02F2301/00C02F2305/00
Inventor 周石庆卜令君施周邓林衣启航毕晨
Owner HUNAN UNIV
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