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Iron ion loaded activated carbon fiber composite cathode, preparation method and application thereof

An activated carbon fiber, composite cathode technology, applied in chemical instruments and methods, special compound water treatment, textile industry wastewater treatment and other directions, can solve the problems of complex process, secondary pollution, etc. The effect of reducing adverse side effects

Inactive Publication Date: 2015-03-04
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the defects or deficiencies in the prior art, the object of the present invention is to apply the active carbon fiber composite cathode of loaded iron ions to the electric Fenton process, and iron ions are loaded on the active carbon fibers with large specific surface area, and the solution is oxygenated under the condition of oxygenation. Oxygen is reduced at the cathode to produce H 2 o 2 At the same time, it directly reacts with the supported catalyst iron to produce OH, and this system is applied to treat HA in water and MG in printing and dyeing wastewater, which overcomes the need to add metal ion catalysts to the system in the existing electro-Fenton technology, and must be followed up Defects of complex process and secondary pollution caused by the removal of by-products such as sludge produced in large quantities

Method used

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  • Iron ion loaded activated carbon fiber composite cathode, preparation method and application thereof
  • Iron ion loaded activated carbon fiber composite cathode, preparation method and application thereof
  • Iron ion loaded activated carbon fiber composite cathode, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Example 1: Preparation of Fe / ACF composite cathode by inner layer adsorption method and XPS characterization

[0071] Step 1, the acidification of ACF: with 0.5g ACF (specific surface area 1500m 2 g -1 ) into 100mL 40% (mass concentration) H 2 SO 4 solution, in a constant temperature shaker at 30°C at 30r·min -1 Take it out after oscillating at a rotating speed of 24 hours, wash it with deionized water 2 to 3 times, and dry it at 100°C for 1 hour;

[0072] Step 2, ACF loaded with iron ions: place the acidified ACF in step 1 in 0.66mol L -1 FeSO 4 solution, in a constant temperature shaker at 30°C at 30r·min -1 Take it out after oscillating at a rotating speed of 24 hours, wash it with deionized water until neutral, and dry it at 100°C for 1 hour;

[0073] Fix the Fe / ACF obtained in step 2 on a polytetrafluoroethylene tube with holes to obtain the Fe / ACF composite cathode.

[0074] The elemental analysis of Fe / ACF surface was carried out by X-photoelectron spectr...

Embodiment 2

[0076] Embodiment 2: Precipitation method prepares Fe / ACF composite cathode and XPS characterization

[0077] Step 1, the pretreatment of ACF: with 0.4g ACF (specific surface area 1500m 2 g -1 ), cut into 7cm×9cm slices, immersed in 5% hydrochloric acid, heated and boiled for 1 hour to remove possible impurities and inorganic ions, rinsed with deionized water; immersed in 5% sodium hydroxide, heated and boiled for 1 hour, and then Boil in deionized water for 1 hour, let stand overnight, wash with deionized water until neutral, and dry at 100°C for 24 hours;

[0078] Step 2, ACF loaded with iron ions: fix the acidified ACF in step 1 on the support, and the immersion concentration is 0.18mol L -1 FeSO 4 To the solution, add 5mol·L dropwise at 70°C -1 Sodium hydroxide solution 50mL, and stirred loading reaction for 5 hours. After the reaction was completed, rinse and soak the loaded surface with deionized water until the deionized water was clear, and dry at 100°C for 1 h. ...

Embodiment 3

[0082] Embodiment 3: capture of hydroxyl radical (OH) in the reaction

[0083] In a 200mL beaker, add 0.05mol·L -1 Na 2 SO 4 and 10mmol·L -1 Coumarin solution, adjust the pH of the solution to 3.0, the potential to -1.0V, and the oxygen flow to 2.0L min -1 , the Fe / ACF composite cathode prepared in Example 1 is used as the working electrode, the spiral platinum wire is the auxiliary electrode, and the saturated calomel electrode is the reference electrode, and the three electrodes are put into the above solution; Sampling in the middle, and sampling in the solution every 10 minutes for the next 30 minutes, using a fluorescence spectrometer to measure the fluorescence intensity of the sample at an excitation wavelength of 332nm and an emission wavelength of 460nm, because coumarin can react with OH to form a stable and fluorescent 7 -Hydroxycoumarin, so measuring the fluorescence intensity of 7-hydroxycoumarin can reflect the amount of OH produced by the system.

[0084] D...

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Abstract

The invention relates to an iron ion loaded activated carbon fiber composite cathode, a preparation method and application thereof. The composite cathode includes iron ion loaded activated carbon fiber. The iron ion loaded activated carbon fiber composite cathode is applied to treatment of humic acid-containing wastewater and triphenylmethane dyes in printing and dyeing wastewater by an Electro-Fenton technique. The method for preparation of the iron ion loaded activated carbon fiber composite cathode includes an inner layer adsorption process and a precipitation process. Iron ions are loaded on activated carbon fiber, the treatment process is simplified, production of sludge is completely eradicated, and no secondary pollution exists; the iron ions loaded on the activated carbon fiber can react with H2O2 generated by electroreduction of dissolved oxygen on the composite cathode surface, thus reinforcing reaction on the composite cathode surface and strengthening the reaction efficiency; iron ions and acidic groups on the surface of the activated carbon fiber undergo inner layer adsorption, so that the iron ions are not easy to fall off during use, and the life of the composite cathode is increased. After repeated use of the composite cathode 4 times, the decolorization rate of the target pollutant is still above 93%.

Description

technical field [0001] The invention relates to the application of treating refractory organic pollutants in water and waste water, in particular to a composite cathode of activated carbon fiber loaded with iron ions, a preparation method and application thereof. Background technique [0002] The organic matter in the secondary effluent after conventional biological treatment is part of the organic matter that is difficult to biodegrade, and the other part is the metabolites of the organism itself and the incomplete decomposition product of the organism itself. This part of the substance has the structural characteristics of humic acid substances. [0003] Among them, refractory organic pollutants are one of the main sources of water environmental pollution. Most of them are biologically toxic and cannot be degraded by conventional biological treatment processes. The adsorption method only realizes the phase transfer of such pollutants, and does not removed from the environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/467C02F1/461C02F1/72
CPCC02F1/46109C02F1/4672C02F2001/46142C02F2101/30C02F2101/308C02F2103/30C02F2305/026
Inventor 何盈盈余晨张潇予孟建张阳骆萌王晓昌
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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