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Fast organic pollutant removing method based on vulcanized zero-valence-iron-activated hydrogen peroxide

A technology of organic pollutants and zero-valent iron, applied in water pollutants, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve reagent consumption and iron sludge production, reduce iron sludge generation, and use efficiency Low-level problems, to achieve the effect of improving electron transfer efficiency, reducing difficulty, and improving utilization efficiency

Active Publication Date: 2017-02-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the low utilization efficiency of hydrogen peroxide in the classic Fenton system, the large amount of reagent consumption and iron sludge production, and the need to pre-adjust the pH of the system; Fe 0 / H 2 o 2 Low catalytic reaction efficiency in the Fenton-like system is the key bottleneck problem that limits its large-scale and efficient application. It is proposed to use zero-valent iron sulfide as a substitute for Fe 2+ or Fe 0 , using a mechanochemical process to convert micron-sized crystalline FeS with excellent electrical conductivity into 2 coated with Fe 0 Surface, instead of the passivation film (iron oxide) that may be formed, accelerates the Fe in the system by improving the electron transfer efficiency 2+ generation and regeneration, greatly reducing the generation of iron sludge, and using FeS 2 with H 2 o 2 and its relationship with Fe 3+ The reaction provides the pH environment required by the Fenton system (reaction formula 1, 2), so as to achieve efficient and rapid removal of target pollutants

Method used

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  • Fast organic pollutant removing method based on vulcanized zero-valence-iron-activated hydrogen peroxide
  • Fast organic pollutant removing method based on vulcanized zero-valence-iron-activated hydrogen peroxide

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A. Preparation of zero-valent iron sulfide

[0033]100g of reduced iron powder (20 mesh, purchased from Nanjing Best Metal Materials Co., Ltd.) and 10g of pyrite (100 mesh, purchased from Luoyang Weixiang Abrasives Co., Ltd.) were uniformly mixed, and a mortar grinder (FRITSCH, PULVERISETTE 2) Grinding for 24 hours at a speed of 80rpm, so that FeS in pyrite 2 Coated in Fe 0 On the surface, the obtained particle size is 200-5000 mesh zero-valent iron sulfide powder, which is characterized by XRD, see figure 1 , the results show that the sulfide zero-valent iron powder is FeS 2 / Fe 0 Complex crystal structure.

[0034] B. Removal of organic pollutants

[0035] The polluted medium to be treated is water polluted by phenol and p-chlorophenol, pH=6.7, COD=1320mg / L, and the concentration of phenol is 420mg / L and p-chlorophenol is 126mg / L measured by ultraviolet spectrophotometry, in 100L waste water Add 75g of zero-valent iron sulfide powder and 360mL of 30% hydrogen pe...

Embodiment 2

[0037] A. Preparation of zero-valent iron sulfide

[0038] Mix 300g of reduced iron powder (40 mesh, purchased from Nanjing Best Metal Material Co., Ltd.) with 50g of pyrite (200 mesh, purchased from Tongling Heer Mineral Products Co., Ltd.), and use a disc grinder (FRITSCH, PULVERISETTE 13) Grinding for 16 hours, the rotating speed is 440rpm, so that FeS in pyrite 2 Coated in Fe 0 On the surface, obtain zero-valent iron sulfide powder with a particle size of 400-8000 meshes to obtain FeS 2 / Fe 0 Composite crystal form of zero-valent iron sulfide powder.

[0039] B. Removal of organic pollutants

[0040] The polluted medium to be treated is dye-contaminated water, pH=8.2, COD=3450mg / L, the concentration of methyl orange is 1380mg / L, and the concentration of orange G is 560mg / L by ultraviolet spectrophotometry. Add 240g of sulfide to 100L of waste water Zero-valent iron powder and 960mL 30% hydrogen peroxide constitute a reaction system. After mixing and reacting at room t...

Embodiment 3

[0042] A. Preparation of zero-valent iron sulfide

[0043] Mix 60 g of reduced iron powder (60 mesh, purchased from Hangzhou Fangsheng Chemical Co., Ltd.) with 5 g of pyrite (325 mesh, purchased from Foshan Perete Mineral Raw Materials Co., Ltd.), and use a vibrating cup mill (FRITSCH, PULVERISETTE 9) Grinding for 12 hours, the rotating speed is 1200rpm, so that FeS in pyrite 2 Coated in Fe 0 On the surface, obtain zero-valent iron sulfide powder with a particle size of 800-12500 mesh, and obtain FeS 2 / Fe 0 Composite crystal form of zero-valent iron sulfide powder.

[0044] B. Removal of organic pollutants

[0045] The polluted medium to be treated is a water body polluted by nitrobenzene, pH=5.5, COD=680mg / L, and the concentration of nitrobenzene measured by high performance liquid chromatography is 270mg / L, and 30g of sulfide zerovalent iron powder and 150mL of 30% hydrogen peroxide constituted the reaction system. After mixing and reacting at room temperature for 12 m...

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Abstract

The invention discloses a fast organic pollutant removing method based on vulcanized zero-valence-iron-activated hydrogen peroxide. The method has the advantages that the surface of Fe0 is coated with crystal type FeS2 with excellent conductivity through a mechanical chemical process so as to replace a possibly-formed passive film (iron oxide), the generation and regeneration of Fe2+ in a system are accelerated, a pH environment needed by a Fenton system is provided by using FeS2 and H2O2 and reaction of the FeS2 and H2O2 with Fe3+, and accordingly target pollutants can be removed efficiently and fast; the materials needed by the method are wide in source and cheap, and the method is high in pollutant degrading drive force, fast, and high in reagent utilization efficiency; the method is high in universality, applicable to the treatment of various industrial wastewater and other polluted water and most organic pollutants in soil and underground environments, evident in economic, environment and social benefits and worthy of large-scale popularization and has no strict requirements on the initial pH condition of a target medium.

Description

[0001] (1) Technical field [0002] The invention relates to a method for removing organic pollutants by catalytic oxidation, which belongs to the advanced oxidation technology in the field of environmental chemistry. [0003] (2) Background technology [0004] High-speed, continuous, and extensive industrial development has greatly improved people's material life, but it has also brought many problems to the ecological environment, especially a series of artificially synthesized refractory, persistent toxic and harmful pollutants that continue to enter the environment and pass through the food chain. Enrichment, a great threat to human health and development. [0005] Fenton's advanced oxidation technology based on hydroxyl radicals (Fe 2+ / H 2 o 2 ) because of its strong driving force (OH redox potential as high as 2.79V) and fast reaction speed (reaction rate constant as high as 10 6 mol / s), wide application range (can react with 95% organic matter), simple operation, an...

Claims

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Application Information

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IPC IPC(8): C02F1/72
CPCC02F1/722C02F1/725C02F2101/305C02F2101/306C02F2101/308C02F2101/345C02F2101/36C02F2101/38C02F2305/026
Inventor 何锋黄丹维吴骏谷亚威胡二丹
Owner ZHEJIANG UNIV OF TECH
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