Ferric aluminum silicon composite carbon-based electrode and application thereof in decoloration of wastewater

A technology of composite carbon and base electrodes, which is applied in water/sewage treatment, oxidized water/sewage treatment, water/sludge/sewage treatment, etc. It can solve problems such as shedding, coating loss of catalytic function, softening, etc., and achieves the goal of using Low environmental requirements, good wastewater decolorization effect, and simple preparation process

Active Publication Date: 2011-07-20
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cathode of the inventive device is mainly composed of carbon nanotubes, polytetrafluoroethylene and gamma-basic iron oxide. The cathode prepared by physical methods is immersed in the medium, and the coating is prone to blistering, softening, and large-scale peeling off. , causing the coating to lose its catalytic function
Its cathode material carbon nanotubes and titanium mesh are expensive, which increases the overall cost and is not conducive to its wide application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Mix the aqueous solution of tetraethyl sodium orthosilicate, ferric perchlorate, and aluminum trichloride with ethanol to obtain a mixed solution. In the mixed solution, tetraethyl orthosilicate, ferric perchlorate, and aluminum trichloride , The molar concentration of ethanol is 1.00M, 0.20M, 0.20M, 1.00M respectively;

[0036] 2) Soak the carbon felt in the above solution, stir and heat to 80°C, add dropwise 1.5M ammonia water to precipitate iron, silicon, and aluminum in the carbon felt, and react for 2 hours;

[0037] 3) After the heat preservation reaction is complete, take out the carbon-based material, first dry it at 110°C for 24 hours, wash it with deionized water three times, and dry it again at 110°C for 24 hours to obtain an iron-aluminum-silicon composite carbon-based electrode.

Embodiment 2

[0039] 1) Mix the aqueous solution of tetraethyl sodium orthosilicate, ferric perchlorate, and aluminum trichloride with ethanol to obtain a mixed solution. In the mixed solution, tetraethyl orthosilicate, ferric perchlorate, and aluminum trichloride , The molar concentration of ethanol is respectively 0.90M, 0.20M, 0.22M, 1.03M;

[0040] 2) Soak the carbon fibers in the above solution, stir and heat to 85°C, add dropwise 2.0M ammonia water to precipitate iron, silicon, and aluminum in the carbon fibers, and react for 1.5 hours;

[0041] 3) After the insulation reaction was complete, the carbon-based material was taken out, first dried at 100°C for 28 hours, washed three times with deionized water, and dried again at 105°C for 24 hours to obtain an iron-aluminum-silicon composite carbon-based electrode.

Embodiment 3

[0043] 1) Mix the aqueous solution of tetraethyl sodium orthosilicate, ferric perchlorate, and aluminum trichloride with ethanol to obtain a mixed solution. In the mixed solution, tetraethyl orthosilicate, ferric perchlorate, and aluminum trichloride , The molar concentration of ethanol is respectively 1.10M, 0.19M, 0.21M, 0.95M;

[0044] 2) Soak the carbon cloth in the above solution, stir and heat to 82°C, add dropwise 1.5M ammonia water to precipitate iron, silicon, and aluminum in the carbon cloth, and react for 2.0 hours;

[0045] 3) After the insulation reaction was complete, the carbon-based material was taken out, firstly dried at 100°C for 30 hours, washed three times with deionized water, and dried again at 110°C for 24 hours to obtain an iron-aluminum-silicon composite carbon-based electrode.

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Abstract

The invention discloses a ferric aluminum silicon composite carbon-based electrode and application thereof in decoloration of wastewater. A preparation method for the ferric aluminum silicon composite carbon-based electrode comprises the following steps of: mixing aqueous solution of tetraethyl orthosilicate, ferric perchlorate and aluminum choride and ethanol to obtain mixed solution; putting a carbon-based material into the mixed solution, stirring, heating to 75 to 85 DEG C, and adding ammonia water, so that iron, silicon and aluminum are deposited on the carbon-based material; and after performing a heat-preserving reaction completely, taking the carbon-based material out, drying for the first time, washing, and drying again to obtain the ferric aluminum silicon composite carbon-basedelectrode. The ferric aluminum silicon composite carbon-based electrode is used as a cathode of an electro-Fenton system, so a Fenton reagent can be provided continuously at the cathode and performs a Fenton reaction with hydrogen peroxide effectively to generate hydroxyl free radicals with high oxidability to oxidize organic matters in the wastewater, and the decoloration effect of the wastewater is desirable. The electrode has a simple preparation process, is low in cost, has low requirement on using environment and can be used under the condition of neutral pH, and the catalytic efficiencyis far higher than that of ferric oxides s.

Description

technical field [0001] The invention relates to an electrode preparation method and its application, in particular to an iron-aluminum-silicon composite carbon-based electrode and its application in wastewater decolorization. Background technique [0002] The composition of printing and dyeing wastewater is very complex, and it is a kind of refractory organic wastewater, which seriously pollutes the environment. Dye wastewater contains a large amount of residual dyes and auxiliaries, and the main pollution factors include suspended solids (SS), chemical oxygen demand (COD), heat, chromaticity, acidity, alkalinity and other soluble substances. Among them, the chromaticity produced by residual dyes is the main problem in the treatment of printing and dyeing wastewater. At present, the decolorization method of dye wastewater cannot be used effectively alone. For example, the flocculation treatment method has no obvious decolorization effect on soluble dyes, and a large amount...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72
Inventor 庄莉袁勇周顺桂王跃强
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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