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Preparation method of activated carbon supported ferrous heterogeneous Fenton's reagent oxidation catalyst

A heterogeneous Fenton, oxidation catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve difficult filtration separation, increase the difficulty of process operation , increase the cost of wastewater treatment and other issues, to achieve the effect of simplifying the treatment process, improving the efficiency of source utilization, and being easy to popularize and use

Inactive Publication Date: 2012-08-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has the following disadvantages in use: 1. The filter cake obtained after filtration is mainly composed of a mixture of ferrous ions and hydroxides of ferric ions, which inevitably contains a certain amount of other pollutants, which is difficult to further process. Disposal may easily cause secondary pollution
②The soluble ferrous salt used as a catalyst is discarded in the form of filter cake after participating in an oxidation reaction, which cannot be recycled, which not only wastes resources, but also increases the cost of wastewater treatment
③The ferrous ions and hydroxides of ferric ions precipitated in the solution have small particles and slow sedimentation velocity; the formed filter cake layer is dense and has small pores, making it difficult to filter and separate, which increases the difficulty of process operation

Method used

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  • Preparation method of activated carbon supported ferrous heterogeneous Fenton's reagent oxidation catalyst
  • Preparation method of activated carbon supported ferrous heterogeneous Fenton's reagent oxidation catalyst
  • Preparation method of activated carbon supported ferrous heterogeneous Fenton's reagent oxidation catalyst

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Embodiment 1

[0037] First preparation 100mL concentration is the dilute sulfuric acid solution of 40% (mass fraction), at room temperature, under stirring condition, add 25g granular gac to soak in this solution, stirring speed is controlled at 150 rpm, after soaking time 24 hours, filter. The filtered activated carbon is continuously washed with flowing tap water, and the pH value of the drain water is measured during cleaning. When the measured pH value is 5-6, the cleaning is stopped. Then, the cleaned activated carbon is put into an oven and heated at a temperature of 105°C. Let dry for 2 hours. Get the prepared concentration 8% (mass fraction) ferrous sulfate solution 50mL, under room temperature, stirring condition, add above-mentioned activated carbon through dry treatment, the ferrous ion in the solution and activated carbon surface active group generation substitution reaction; Controlled at 150 rpm, after the replacement reaction was carried out for 24 hours, it was filtered. Th...

Embodiment 2

[0039] First preparation 50mL concentration is the dilute hydrochloric acid solution of 40% (mass fraction), at room temperature, under stirring condition, add 12.5g granular gac to soak in this solution, stirring speed is controlled at 150 rpm, after soaking time 24 hours, filter. The filtered activated carbon is continuously washed with running tap water, and the pH value of the drain water is measured during cleaning. When the measured pH = 5-6, the cleaning is stopped. Then, the cleaned activated carbon is put into an oven and heated at a temperature of 105°C. Let dry for 2 hours. Get the prepared concentration 8% (mass fraction) ferrous sulfate solution 25mL, under room temperature, stirring condition, add above-mentioned activated carbon through dry treatment, the ferrous ion in the solution and activated carbon surface active group generation substitution reaction; Controlled at 150 rpm, after the replacement reaction was carried out for 24 hours, it was filtered. The ...

Embodiment 3

[0042] First preparation 100mL concentration is the dilute sulfuric acid solution of 40% (mass fraction), at room temperature, under stirring condition, add 25g granular gac to soak in this solution, stirring speed is controlled at 150 rpm, after soaking time 24 hours, filter. The filtered activated carbon is continuously washed with running tap water, and the pH value of the drain water is measured during cleaning. When the measured pH = 5-6, the cleaning is stopped. Then, the cleaned activated carbon is put into an oven and heated at a temperature of 105°C. Let dry for 2 hours. Get the prepared concentration 4% (mass fraction) ferrous sulfate solution 150mL, under room temperature, stirring condition, add the above-mentioned activated carbon through dry treatment, the ferrous ion in the solution and activated carbon surface active group generation substitution reaction; It was controlled at 150 rpm, and after the displacement reaction was carried out for 48 hours, it was fil...

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Abstract

The invention discloses a preparation method of an activated carbon supported ferrous heterogeneous Fenton's reagent oxidation catalyst. The method comprises steps of: adding active carbon into acid solution, soaking and separating out activated carbon; cleaning the filtered and separated activated carbon with water and drying; adding the activated carbon into a ferrous sulfate solution, so that ferrous ions in the solution carry out load reaction on the surface of the activated carbon, and separating out the loaded active carbon; cleaning the loaded active carbon with alkali lye and drying. The present invention uses active carbon supported ferrous ion as Fenton's reagent oxidation catalyst, which can be reused, so as to increase the efficiency of resource use and generates no secondary pollution; as the catalyst can be recycled, wastewater treatment cost is greatly reduced; recycling of catalyst simplifies the process; and catalyst preparation technology has the advantages of simple process, mild condition, easiness to popularization and usage.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, and in particular relates to a preparation method of a heterogeneous Fenton reagent oxidation catalyst supported by activated carbon. Background technique [0002] Fenton's reagent refers to an oxidation system composed of hydrogen peroxide and ferrous ions. When hydrogen peroxide is added to an acidic solution containing ferrous ions, hydrogen peroxide generates active hydroxyl radicals (OH) under the catalysis of ferrous ions. · ). Compared with other oxidants, hydroxyl radicals have a higher standard redox electrode potential (E°=2.80V), which is the theoretical basis for the stronger oxidizing properties of Fenton's reagent. [0003] At present, as an advanced oxidation method, the Fenton reagent oxidation method has been widely used in the treatment of industrial wastewater containing refractory organic substances such as phenols, aromatic amines, pesticides and nuclear waste. The spec...

Claims

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Application Information

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IPC IPC(8): B01J23/745C02F1/72C02F101/30
Inventor 韩永忠李建旭王贤荣王蕾陈艳玲
Owner NANJING UNIV
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