Flow-through electrochemical system for selectively degrading organic pollutants based on singlet oxygen and application thereof

An electrochemical and methyl technology, applied in the field of water treatment, can solve the problems of slow reaction kinetics, increased risk, cumbersome operation process, etc., and achieve the effects of improving removal rate and efficiency, shortening reaction time, and enhancing mass transfer

Active Publication Date: 2020-09-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the invention patent (CN201711399032.3) provides a method of using carboxylated carbon materials to activate persulfate production 1 o 2 However, because powdered carbon materials are prone to agglomeration in water and difficult to separate and recycle, it is difficult to be widely used in water restoration.
Invention patent (CN201310593743.X) provides a method of using solid peroxide to induce persulfate production 1 o 2 method, which utilizes solid oxides to generate H in situ in water 2 o 2 and react with persulfate to form 1 o 2 , but the operation process is more cumbersome and the reaction time is longer
However, for traditional homogeneous systems of 1 o 2 However, there are still three ubiquitous problems in practical applications: (1) slow reaction kinetics; (2) H 2 o 2 High risks associated with transportation, storage and overdose; (3) Difficulties in handling in practical applications
This not only increases the cost, but also increases the 2 o 2 risks of

Method used

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  • Flow-through electrochemical system for selectively degrading organic pollutants based on singlet oxygen and application thereof
  • Flow-through electrochemical system for selectively degrading organic pollutants based on singlet oxygen and application thereof
  • Flow-through electrochemical system for selectively degrading organic pollutants based on singlet oxygen and application thereof

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Experimental program
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Effect test

Embodiment 1

[0027] A method for preparing a flow-through electrochemical system for selectively degrading organic pollutants based on singlet oxygen:

[0028] (1) Dissolve 20 mg of multi-walled CNTs in 50 mL of 1-methyl-2-pyrrolidone, and disperse them by ultrasonication. Ultrasonic conditions: ultrasonic power is 100 W, and ultrasonic time is 40 min;

[0029] (2) Vacuum suction filtration of the dispersion onto a polytetrafluoroethylene support membrane with a diameter of 47 mm to obtain a CNT membrane;

[0030] (3) if figure 1 The prepared CNT filter membrane is used as the cathode (2), and the porous titanium sheet is placed as the anode (4) in a double-layer membrane filter housing. Containing 1mmol of sodium hypochlorite at a flow rate of 1mL / min figure 1 The direction of the solid arrow in the middle enters the shell of the double-layer membrane filter device, and passes through the CNT filter membrane (pH value is 7.0, and the applied voltage is 1-3V), along the figure 1 Outflow...

Embodiment 2

[0033] a based on 1 o 2 The flow-through electrochemical system selectively degrades organic dyes in water:

[0034] (1) Dissolve 20 mg of multi-walled CNTs in 40 mL of 1-methyl-2-pyrrolidone, and disperse them by ultrasonication. Ultrasonic conditions: ultrasonic power is 150 W, and ultrasonic time is 30 min;

[0035] (2) Vacuum filter the dispersion onto a polytetrafluoroethylene support membrane with a diameter of 47 mm to prepare a CNT membrane.

[0036] (3) if figure 1 The prepared CNT filter membrane is used as the cathode (2), and the porous titanium sheet is placed as the anode (4) in a double-layer membrane filter housing. Wastewater containing 30 μmol of organic dye flows along the flow rate of 1mL / min figure 1 The direction of the solid arrow in the middle enters the shell of the double-layer membrane filter device, and passes through the CNT filter membrane (pH value is 7.0, and the applied voltage is -2.5V), along the figure 1 Outflow in the direction of the ...

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Abstract

The invention discloses a flow-through electrochemical system for selectively degrading pollutants based on singlet oxygen and application thereof in selectively degrading organic pollutants in a water body. The preparation method of a cathode CNT filter membrane comprises the following steps of: dissolving multiwalled CNT in 1-methyl-2-pyrrolidone, and carrying out ultrasonic treatment for uniform dispersion; and carrying out vacuum pumping filtration on the obtained dispersion liquid onto a polytetrafluoroethylene support membrane to prepare the CNT filter membrane. The flow-through electrochemical system comprises a shell, wherein a water inlet is formed in one side of the shell, and a water outlet is formed in the other side of the shell, the shell is internally provided with an anodeand a cathode, the anode adopts a porous titanium sheet, the cathode adopts the CNT filter membrane prepared by the preparation method of the CNT filter membrane, one side of the cathode, which is close to the water inlet, is provided with a titanium ring connector for connecting the cathode, and an insulating silica gel separator is arranged between the cathode and the anode. The invention provides an efficient and rapid method for selective environmental remediation.

Description

technical field [0001] The invention relates to a flow-through electrochemical system for selectively degrading organic pollutants based on singlet oxygen, which belongs to the technical field of water treatment. Background technique [0002] singlet oxygen ( 1 o 2 ) is an unstable excited state oxygen, which reacts with superoxide radicals, hydroxyl radicals and hydrogen peroxide (H 2 o 2 ) and other oxygen-active species, they play important roles in physics, chemistry, biomedicine and the environment. At present, it is mainly produced by catalyst activation of persulfate 1 o 2 . For example, the invention patent (CN201711399032.3) provides a method of using carboxylated carbon materials to activate persulfate production 1 o 2 However, because powdered carbon materials are prone to agglomeration in water and difficult to separate and recover, it is difficult to be widely used in water restoration. Invention patent (CN201310593743.X) provides a method of using soli...

Claims

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Application Information

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IPC IPC(8): C02F1/467C02F1/72C01B13/02C02F101/38C02F103/30
CPCC02F1/4672C02F1/725C01B13/0214C02F2101/38C02F2101/308C02F2103/30
Inventor 刘艳彪郭东丽刘富强徐辉李方杨波方小峰王致远
Owner DONGHUA UNIV
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