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A method for treating organic wastewater with a heterogeneous Fenton-coupled tubular membrane electrode

A technology of heterogeneous Fenton and organic wastewater, applied in the field of environmental engineering, can solve problems such as iron sludge solid waste, achieve the effects of reducing hazardous waste, good economy, and improving mass transfer efficiency

Active Publication Date: 2022-02-01
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of iron sludge solid waste generated in the existing Fenton oxidation, the present invention provides a method for treating wastewater with a heterogeneous Fenton-coupled tubular membrane electrode, in which carbon-based Fe 3 o 4 The catalyst is adsorbed to the stainless steel cathode by an external magnetic field for reduction activation, which can replenish Fe(II) consumed in the catalytic process in situ without producing iron sludge, effectively reducing hazardous waste

Method used

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  • A method for treating organic wastewater with a heterogeneous Fenton-coupled tubular membrane electrode
  • A method for treating organic wastewater with a heterogeneous Fenton-coupled tubular membrane electrode
  • A method for treating organic wastewater with a heterogeneous Fenton-coupled tubular membrane electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0047] 1) adopt hydrothermal method, prepare Fe 3 o 4 @MWCNT heterogeneous Fenton catalyst

[0048] (1) Weigh 0.30g FeCl 3 ·6H 2 O in a 50mL beaker, add 10mL ultrapure water, stir until FeCl 3 ·6H 2 O is completely soluble in water.

[0049] (2) Add 20mL of 5mg·mL -1 Add the carboxylated multi-walled carbon nanotube dispersion liquid into the solution prepared in step (1), and stir for 30 minutes. (3) Slowly add 10 mL of diethanolamine into the solution prepared in step (2), and stir for 30 min.

[0050] (4) Add the precursor solution prepared in (3) into a 100 mL polytetrafluoroethylene-lined reactor and put it into a muffle furnace. Set the heating rate of the muffle furnace to 5°C min -1 , raised the temperature to 190°C and kept it warm for 6h, then cooled naturally to room temperature.

[0051] (5) Wash and filter the reaction product obtained in (4) with ultrapure water until the filtrate is neutral. Freeze-dry the obtained brown-black powder, and grind it thr...

Embodiment 2

[0069] 1) adopt coprecipitation method, prepare Fe 3 o 4 @PAC heterogeneous Fenton catalyst

[0070] (1) Weigh 2.0g FeCl respectively 2 4H 2 O and 5.4 g FeCl 3 ·6H 2 O, dissolved in 100mL ultrapure water.

[0071] (2) Add 5.0 g of powdered activated carbon (PAC) into the solution prepared in step (1), vacuumize and stir for 30 min.

[0072] (3) Put the solution prepared in step (2) into a 50°C water bath, slowly add NaOH solution to pH=9.0 under vigorous stirring, and age in a 50°C water bath for 12 hours.

[0073] (4) Wash and filter the reaction product obtained in (3) with ultrapure water until the filtrate is neutral. Dry the obtained black powder and grind it through a 200-mesh sieve to obtain Fe 3 o 4 @PAC heterogeneous Fenton catalyst, the carbon content is about 68%, and the BET specific surface area is 112.1223±0.5517m2 / g.

[0074] Such as Figure 7 Shown, for the Fe prepared in this example 3 o 4 XRD pattern of @PAC heterogeneous Fenton catalyst, (002) i...

Embodiment 3

[0082] 1) adopt coprecipitation method, prepare Fe 3 o 4 @PAC heterogeneous Fenton catalyst

[0083] With embodiment 2.

[0084] II) Preparation of Ti / PbO 2 Tubular Membrane Electrode and Reactor Design

[0085] With embodiment 1.

[0086] III) Degradation experiment

[0087] In the degradation experiment, 500mL 50mg / L pyrazole solution (containing 0.05mol / L Na 2 SO 4 As a supporting electrolyte, pH=4.0) was added into the tubular electrode reactor, the peristaltic pump was turned on for circulation, and the solution temperature was maintained at 30±1°C. Ti / PbO 2 The tubular membrane electrode is connected to the positive pole of the DC power supply, and the stainless steel cathode is connected to the negative pole of the DC power supply. Join Fe 3 o 4 @PAC heterogeneous Fenton catalyst and hydrogen peroxide, the catalyst and hydrogen peroxide concentrations are 1000mg / L and 200mg / L respectively, and the DC power supply is turned on at the same time to start the rea...

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Abstract

The invention discloses a method for treating organic waste water with a heterogeneous Fenton coupling tubular membrane electrode, which belongs to the technical field of environmental engineering. It includes the use of Ti / PbO 2 The electrochemical oxidation process constructed by tubular membrane electrode and stainless steel cathode also includes the heterogeneous Fenton oxidation process, which uses magnetic and conductive carbon-based Fe 3 o 4 Catalyst As a heterogeneous catalyst, the carbon-based Fe 3 o 4 The catalyst is adsorbed to the stainless steel cathode by an external magnetic field for reduction activation, and Fe(II) consumed during the catalytic process is supplemented in situ. The invention enables the heterogeneous Fenton catalyst to be directly adsorbed to the cathode periodically for activation, so that the catalyst can be activated in situ in the system and continue to play a role, which not only avoids the generation of iron sludge, but also enables the catalyst to be recycled and used without frequent external Adding a catalyst has good economic, environmental and social benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and more specifically relates to a method for treating organic waste water with a heterogeneous Fenton-coupled tubular membrane electrode. Background technique [0002] With the rapid development of my country's social economy, industrial production has increased sharply, and the resulting organic wastewater is increasing day by day. At present, industrial organic wastewater treatment has become a "bottleneck" restricting industrial development. If it is not handled properly, it will seriously pollute the surrounding environment and endanger the health of surrounding animals, plants and the general public. [0003] Fenton oxidation and Fenton oxidation coupled with other advanced oxidation technologies can quickly degrade refractory pollutants in industrial wastewater, but these technologies have a narrow pH range in practice and produce a large amount of iron sludge hazardous w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/72C02F101/30
CPCC02F1/4672C02F1/46109C02F2101/30C02F2305/026C02F2305/023C02F2001/46171
Inventor 韩卫清周子杰魏卡佳刘润殷许孙秀云李健生刘晓东沈锦优
Owner NANJING UNIV OF SCI & TECH
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