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Preparation method and application of iron-sulfur heterogeneous Fenton-like catalyst

A catalyst, Fenton's technology, used in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of heterogeneous Fenton-like catalysts adapting to a narrow pH range and complex preparation processes, and achieves high Treatment effect, simple preparation process, and effect of improving catalytic efficiency

Active Publication Date: 2016-05-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a preparation method and application of an iron-sulfur heterogeneous Fenton-like catalyst in order to solve the problems that the existing heterogeneous Fenton-like catalyst has a narrow pH range and complicated preparation process

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Dissolve ferrous sulfate heptahydrate in water, stir to dissolve, and make a solution with a concentration of 0.06mol / L; dissolve sodium hydrosulfide and sodium sulfide in water respectively, and make a solution with a concentration of 0.2mol / L Solution, sodium sulfite is made into a solution with a concentration of 0.08mol / L, and the dispersant ammonium citrate is made into a solution with a concentration of 1mol / L for subsequent use.

[0040](2) Add 0.1‰ volume of dispersant to the ferrous solution, and stir evenly on a magnetic stirrer.

[0041] (3) Under magnetic stirring, slowly pour the sodium hydrosulfide and sodium sulfide solutions into the solution prepared in step (2) in sequence, and at the same time add NaOH solution dropwise to adjust the pH of the solution to maintain it at 5.0~5.5, Stir magnetically for 10 min.

[0042] (4) Slowly add sodium sulfite solution to the solution obtained in step (3), add HCl dropwise, maintain the pH at 5.0-5.5, and stir...

Embodiment 2

[0047] (1) Dissolve ferrous sulfate heptahydrate in water, stir to dissolve, and make a solution with a concentration of 0.1mol / L; dissolve sodium hydrosulfide and sodium sulfide in water respectively, and make a solution with a concentration of 0.3mol / L Solution, sodium sulfite is made into a solution with a concentration of 0.1mol / L, and the dispersant ammonium citrate is made into a solution with a concentration of 1mol / L for subsequent use.

[0048] (2) Add 0.1‰ volume of dispersant to the ferrous solution, and stir evenly on a magnetic stirrer.

[0049] (3) Under magnetic stirring, slowly pour the sodium hydrosulfide and sodium sulfide solutions into the solution prepared in step (2) in sequence, and at the same time add NaOH solution dropwise to adjust the pH of the solution to maintain it at 5.0~5.5, Stir magnetically for 15 min.

[0050] (4) Slowly add sodium sulfite solution to the solution obtained in step (3), add HCl dropwise, maintain the pH at 5.0-5.5, and stir ...

Embodiment 3

[0055] Take 200mL of the effluent from the secondary sedimentation tank of the biological treatment of printing and dyeing wastewater into a 250mL beaker. The COD of the water sample is 128mg / L, and the pH=7.2. 2mM hydrogen peroxide and 0.5mM sodium persulfate were added to the water sample, and 0.5g / L of the heterogeneous Fenton-like activator prepared in Example 1 was added thereto, and the reaction was stirred for 60min. After the reaction, the COD is 45mg / L, which meets the first-class A emission standard.

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Abstract

The invention relates to a preparation method and application of an iron-sulfur heterogeneous Fenton-like catalyst. The preparation method comprises the following steps of adding a dispersing agent into a ferrous solution, and performing uniform stirring; sequentially and slowly pouring solutions of hydrosulfide and sulfide into the solution, keeping the pH of the solution to be 5.0 to 5.5, and performing stirring for 10 to 20min; slowly adding a solution of sulfite into the solution, keeping the pH value to be 5.0 to 5.5, and performing stirring for 5 to 10min to obtain precursor sol; transferring the precursor sol into a sealed glass bottle, and performing constant temperature (25 DEG C) aging reaction in dark to obtain black precipitates, i.e. the final catalyst. The pH of wastewater is regulated to 7.0 to 11.0, a mixed solution of hydrogen peroxide / persulfate and the synthesized heterogeneous fenton-like catalyst are added into the wastewater, and stirring reaction is performed for 10 to 120min to finish the degrading of organic pollutants in the wastewater. A preparation process of the prepared iron-sulfur heterogeneous Fenton-like catalyst is simple, conditions are mild, and when being used, the prepared iron-sulfur heterogeneous Fenton-like catalyst is large in applicable pH range, and has a good deep treatment effect on industrial wastewater.

Description

technical field [0001] The invention relates to a preparation method of an iron-sulfur heterogeneous Fenton-like catalyst and its application in advanced treatment of industrial wastewater. Background technique [0002] As a common advanced oxidation technology, Fenton oxidation technology has been widely used in the advanced treatment of wastewater. The main principle is that through the Fe 2+ with H 2 o 2 Produce hydroxyl radicals to oxidize and degrade refractory organic pollutants in water. However, the traditional homogeneous Fenton reaction has certain defects, such as a large amount of iron oxide precipitation, and the applicable pH range is lower than 3, Fe 2+ Catalytic H 2 o 2 Generation of hydroxyl radicals does not completely remove all pollutants. The heterogeneous Fenton-like catalysis came into being, and its goal is to solve the problems of large sludge production and narrow applicable pH range of homogeneous Fenton. [0003] At present, the commonly u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043B01J35/02C02F1/72B01J35/00
CPCC02F1/722C02F1/725B01J27/043C02F2101/30C02F2305/026B01J35/23
Inventor 吴德礼张亚雷刘燕夏
Owner TONGJI UNIV
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