Double tubular membrane electrode electro-catalytic reactor

An electrocatalysis and reactor technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of poor utilization of oxygen and poor mass transfer effect of surface pollutants , low oxygen utilization efficiency and other issues, to achieve the effect of improving electrocatalytic performance, more active sites, and excellent effect

Active Publication Date: 2017-08-01
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, most of the current electro-Fenton reactors require air or pure oxygen aeration to improve the reduction of cathode to produce H 2 o 2 The efficiency of oxygen utilization is low, and the by-product oxygen produced by the oxygen evolution side reaction of the anode has not been well utilized, such as the literature (F.Yu, M.Zhou, X.Yu, Cost-effective electro-Fenton using modified graphite felt that dramatically enhanced on H 2 o 2 electro-generation without external aeration[J]. Electrochimica Acta 163.2015)
Using traditional plate electrodes, the mass transfer effect of surface pollutants is poor, the electrocatalytic efficiency is low, and the cathode electro-Fenton needs an external oxygen source, and the oxygen utilization rate is low

Method used

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  • Double tubular membrane electrode electro-catalytic reactor
  • Double tubular membrane electrode electro-catalytic reactor
  • Double tubular membrane electrode electro-catalytic reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The tubular titanium-based membrane with a size of Φ30×1.5×30mm was ultrasonically cleaned with 20% sodium hydroxide to remove surface oil; then heated in 10% oxalic acid solution for 2 hours to remove the oxide layer; finally stored in 1% oxalic acid solution for future use. Prepare 0.108mol / L chloroiridic acid and 0.092mol / L tantalum pentachloride isobutanol solution, adjust to pH=2 with concentrated hydrochloric acid, and evenly brush the brushing solution onto the pretreated tubular titanium-based film, Put it in an oven for 15 minutes, take it out and put it into a muffle furnace, raise the temperature to 450°C at a rate of 1°C / min, and bake for 10 minutes. The above operation is repeated 10 times, and the last time is baked in a muffle furnace for 60 minutes.

[0042] The tubular graphite-based membrane with a size of Φ55×2.5×30mm was ultrasonically cleaned with acetone for 2 hours to remove surface oil; then ultrasonically cleaned with ethanol and deionized water ...

Embodiment 2

[0048] The pretreatment process of the tubular titanium-based membrane is the same as that of Example 1. Prepare 0.095mol / L chloroiridic acid and 0.081mol / L tantalum pentachloride isobutanol solution, adjust to pH=3 with concentrated hydrochloric acid, and evenly brush the brushing solution onto the pretreated tubular titanium-based film, Put it in an oven for 10 minutes, take it out and put it into a muffle furnace, raise the temperature to 500°C at a rate of 2°C / min, and bake for 10 minutes. The above operation is repeated 15 times, and the last time is baked in a muffle furnace for 60 minutes.

[0049] The pretreatment process of the tubular titanium-based membrane is the same as that of Example 1. Prepare 1% carbon black, 1.2% polytetrafluoroethylene emulsion, and 2.5% n-butanol aqueous solution, put the pretreated tubular graphite-based film into the prepared solution and ultrasonically 6h until uniform dispersion, and put it in a 60-degree oven to dry After 18 hours, ta...

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Abstract

The invention discloses a double tubular membrane electrode electro-catalytic reactor, and belongs to the field of a new electro-catalytic oxidation reactor and manufacture thereof. A pre-treated tubular Ti-based membrane is coated, and the coated membrane is sintered to prepare tantalum-doped iridium oxide which is good in compactness and strong acid resistance and which is taken as a positive electrode; a carbon black and polytetrafluoroethylene membrane is deposited on a pre-treated tubular graphite-based membrane and the obtained product is taken as a negative electrode; and the negative and positive electrodes are assembled into a sealed tubular double-membrane electrode reactor, and a water pump is used to provide power to make water fed from the center of the positive electrode and discharged from the negative electrode. Without external addition of aeration, a double tubular membrane electrode electro-catalytic reactor having a synergistic effect of positive and negative electrode electro-catalysis and membrane coupling is obtained. The double tubular membrane electrodes are large in specific surface area, have a lot of electro-catalytic reaction active sites, and have a multiple synergistic effect of positive electrode oxidation, negative electrode electro-fenton oxidation and membrane separation coupling, and the defect that negative electrode electro-fenton oxidation requires external addition of an oxygen source and is low in utilization rate is overcome.

Description

technical field [0001] The invention belongs to the field of electrocatalytic electrode preparation and reactor design, and in particular relates to a double-tube membrane electrocatalytic reactor and an electrode manufacturing method, and its application in electrocatalytic treatment of refractory organic pollutants. Background technique [0002] Refractory organic wastewater has caused serious environmental pollution, and traditional water treatment processes cannot completely remove it from the water environment. Electrochemical oxidation has attracted widespread attention due to its high efficiency and environmental friendliness. The electrochemical oxidation method mainly uses electrons as reagents, which avoids the secondary pollution caused by the addition of chemicals in the chemical oxidation method. The reaction conditions are mild and the operation is highly controllable. It is an energy-saving and environmentally friendly technology. The electrochemical reaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/467C02F1/461C02F1/72
CPCC02F1/461C02F1/4672
Inventor 韩卫清徐安琳刘思琪孙秀云刘晓东李健生沈锦优王连军
Owner NANJING UNIV OF SCI & TECH
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