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Preparation method and application of heterogeneous Fenton-like catalyst

A catalyst and heterogeneous technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problems of increasing wastewater treatment costs and secondary pollution, etc. Achieve good reusability, mild conditions, and simple methods

Inactive Publication Date: 2013-02-06
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are the following problems in practical applications: (1) Fe remains in the solution after the reaction 2+ , easy to cause secondary pollution; (2) The Fenton reaction is generally carried out in a strongly acidic medium with a pH of 2-3.5, while the actual printing and dyeing wastewater is mostly neutral or even alkaline, so the strong acidic condition greatly increases the cost of wastewater treatment , limiting the further application of Fenton's reagent

Method used

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  • Preparation method and application of heterogeneous Fenton-like catalyst
  • Preparation method and application of heterogeneous Fenton-like catalyst

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preparation example Construction

[0016] The preparation method of a heterogeneous Fenton-like catalyst according to the present invention comprises the following steps: (1) dissolving complexing agent and metal salt in distilled water, and preparing complexing agent and metal salt solution respectively ; (2) Then under the action of a magnetic stirrer, add the metal salt solution dropwise to the complexing agent solution, and stir for 20-60 minutes after the dropwise addition to obtain the metal complex solution; (3) Immerse the activated carbon fiber in After 1-24 hours in the metal complex solution, the activated carbon fibers are taken out, washed with distilled water, and dried to obtain the heterogeneous Fenton-like catalyst.

[0017] Described complexing agent refers to citric acid, citrate, oxalic acid, oxalate; Described metal salt refers to copper salt or iron salt or the mixture of two kinds of salts, and wherein said copper salt comprises CuSO 4 , CuCl 2 , Cu(NO 3 ) 2 , the iron salt includes Fe...

Embodiment 1

[0022] Sodium citrate and FeCl 3 Dissolved in distilled water to make sodium citrate and FeCl separately 3 solution, and then under the action of a magnetic stirrer, the FeCl 3 Add the solution dropwise into the sodium citrate solution, stir for 20 minutes after the dropwise addition to obtain a ferric citrate solution, soak the activated carbon fiber in the ferric citrate solution for 12 hours, take out the activated carbon fiber, wash it with distilled water, and dry it to obtain the new non- Homogeneous Fenton-like catalysts.

[0023] Experiments show that 0.5g of heterogeneous Fenton-like catalyst and 0.3ml of hydrogen peroxide are added to 100ml of reactive red K-2BP with a concentration of 0.05g / L and dye wastewater with a pH of 7, and the reaction is stirred for 9min at a temperature of 50°C , the degradation rate can reach 99.1%

[0024] figure 1 The heterogeneous Fenton-like catalyst prepared in this example is shown to remove the active red K-2BP. It can be seen ...

Embodiment 2

[0027] Sodium citrate and Fe 2 (SO 4) 3 Dissolved in distilled water and formulated separately as sodium citrate and Fe 2 (SO 4 ) 3 solution, and then under the action of a magnetic stirrer, the Fe 2 (SO 4 ) 3 Add the solution dropwise into the sodium citrate solution, stir for 20 minutes after the dropwise addition to obtain a ferric citrate solution, soak the activated carbon fiber in the ferric citrate solution for 12 hours, take out the activated carbon fiber, wash it with distilled water, and dry it to obtain the new non- Homogeneous Fenton-like catalysts.

[0028] Experiments show that 0.5 g of heterogeneous Fenton-like catalyst and 0.3 ml of hydrogen peroxide are added to 100 ml of reactive red X-3B with a concentration of 0.05 g / L and a pH of 9, and the reaction is stirred for 9 minutes at a temperature of 50 ° C. The degradation rate can reach 99.3%

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Abstract

Disclosed are a preparation method and application of heterogeneous Fenton-like catalyst. The preparation method includes the steps of firstly, dissolving complexing agent and metal salt in distilled water to respectively prepare complexing agent and metal salt solutions; secondly dropwise adding the metal salt solution into the complexing agent solution under the action of a magnetic mixer, and mixing for 20-60 after dropwise addition to obtain metal complex solution; and thirdly, impregnating activated carbon fiber in the metal complex solution for 1-24h, and subjecting taken-out activated carbon fiber to distilled water washing and drying to obtain the heterogeneous Fenton-like catalyst. The preparation method is simple, and conditions are mild. Environment-friendly hydrogen peroxide is used as oxidant, no extra ultraviolet light or even visible light is needed, and the heterogeneous Fenton-like catalyst is capable of efficiently degrading organic pollutants such as dye within a wide pH range of 2-10. The heterogeneous Fenton-like catalyst is well repeatable, and secondary pollution of the homogeneous Fenton reagent caused by iron ions is avoided.

Description

technical field [0001] The invention relates to a preparation method and application of a heterogeneous Fenton-like catalyst used for the treatment of printing and dyeing wastewater, which belongs to the technology of organic matter treatment of printing and dyeing wastewater. Background technique [0002] by Fe 2+ and H 2 o 2 The composed Fenton reagent can generate strong oxidizing hydroxyl radicals (oxidation potential 2.8V, second only to fluorine oxidation potential 2.87V), which can remove toxic and refractory organic pollutants in wastewater, so Fenton technology is a Advanced oxidation technology is widely used in wastewater treatment. However, there are the following problems in practical applications: (1) Fe remains in the solution after the reaction 2+ , easy to cause secondary pollution; (2) The Fenton reaction is generally carried out in a strongly acidic medium with a pH of 2-3.5, while the actual printing and dyeing wastewater is mostly neutral or even alk...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C02F1/72C02F103/30
Inventor 姚玉元王列孙利杰吕汪洋陈文兴
Owner ZHEJIANG SCI-TECH UNIV
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