A method for preparing a solid ferric oxide-loading activated carbon Fenton's reagent

A Fenton reagent, activated carbon technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, oxidized water/sewage treatment, etc., can solve the problem of unstable chemical properties of ferrous ions, ferrous ions problems such as loss, activity dependence, etc., to achieve the effect of promoting treatment effect, good catalytic degradation, and decreasing dissolution rate

Inactive Publication Date: 2018-12-18
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the chemical properties of ferrous ions are unstable and easy to oxidize, and ferrous ions will be lost during use, and their activity still largely depends on the external pH value.

Method used

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  • A method for preparing a solid ferric oxide-loading activated carbon Fenton's reagent
  • A method for preparing a solid ferric oxide-loading activated carbon Fenton's reagent
  • A method for preparing a solid ferric oxide-loading activated carbon Fenton's reagent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The activated carbon powder was boiled in 2mol / L nitric acid solution for 2 hours, then soaked for 24 hours, washed with deionized water until the pH value was neutral, and dried for later use. Mix ferric nitrate nonahydrate and acid-treated activated carbon powder at a mass ratio of 4:1, gradually add a small amount of deionized water until the mixture is muddy, shake the muddy mixture in a constant temperature oscillator for 6 hours, and place it in a blast Dry the water in a drying oven at 60°C, transfer to a muffle furnace for calcination at 250°C for 3 hours, and naturally cool to obtain dark brown solid particles, which are ground to fine powder. The sample that embodiment 1 is made is dropped into in the dye wastewater of 100mg / L, and wastewater pH value is neutral, and the dosage of Fenton's reagent is 0.5g / L, and the dosage of hydrogen peroxide is 30mmol / L, after After 20 minutes of reaction, the color of the wastewater completely faded and turned into a transp...

Embodiment 2

[0023] The activated carbon powder was boiled in 2mol / L nitric acid solution for 2 hours, then soaked for 24 hours, washed with deionized water until the pH value was neutral, and dried for later use. Mix ferric chloride hexahydrate and acid-treated activated carbon powder at a mass ratio of 5:1, heat in a blast drying oven at 60°C for half an hour, ferric chloride hexahydrate melts into a liquid state, stir for 3 hours, and then sonicate After 15 minutes, it was transferred to a muffle furnace and calcined at 200°C for 2 hours. After natural cooling, dark brown solid particles were obtained, which were ground into fine powder. The sample that embodiment 2 is made is dropped in the dye waste water of 100mg / l, and the dosage of Fenton's reagent is 0.5g / L, and potassium persulfate dosage is 20mmol / L, through 20 minutes reaction, the color of wastewater Fade off completely to a clear solution.

Embodiment 3

[0025] The Fenton's reagent obtained in Example 2 is recycled, and the test conditions are as follows: the rhodamine dye wastewater concentration is 100mg / l, the dosage of Fenton's reagent is 0.5g / L, and the dosage of hydrogen peroxide is 30mmol / L L, reaction time 40 minutes. The decolorization rates of the first to fourth uses are 100%, 100%, 92% and 68% respectively; the dissolution rates of iron ions are 2.3, 1.7, 1.2 and 0.6mg / L respectively.

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Abstract

The invention relates to a method for preparing a solid ferric oxide-loading activated carbon Fenton's reagent. The method includes fully mixing activated carbon pretreated with acid and an iron salt,and then performing high-temperature calcination. The obtained product is a solid particle substance that is ferric oxide-loading activated carbon. The method overcomes problems that traditional Fenton's reagents cannot be recovered, that iron mud formation from added iron ions requires secondary treatment, and that catalytic degradation activity is highly dependent on acidic environment conditions, and the like. The method is simple in process and low in cost, and the prepared product has advantages including stable chemical properties, no harm to environment, low iron ion dissolution rates,capability of activating hydrogen peroxide and persulfate to achieve catalytic degradation of organic matters, and high efficiency and high speed during application under neutral conditions.

Description

technical field [0001] The invention relates to a solid Fenton's reagent loaded with iron oxide on activated carbon, which belongs to the field of catalyst preparation. Background technique [0002] The traditional Fenton's reagent is composed of ferrous ions and hydrogen peroxide, which generates strong oxidizing hydroxyl radicals in an acidic environment, and is widely used to treat industrial wastewater containing refractory organic matter. Compared with other treatment technologies, Fenton oxidation has the advantages of simple method, fast reaction, strong oxidation ability and non-selectivity, but the Fenton reaction needs to be carried out under acidic conditions, which increases the consumption of chemicals and corrodes equipment. The added iron ions are difficult to recover and reuse, and will cause secondary pollution, which must be removed by precipitation, resulting in an excessively long process and increased processing costs. In order to meet the actual needs,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C02F1/72
CPCB01J23/745C02F1/725C02F2305/026
Inventor 李英柳
Owner CHANGZHOU UNIV
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