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A water restoration method based on silicified zero-valent iron activated persulfate

A technology for activating persulfate and water body remediation, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc. Efficient processing, low cost, convenient operation effect

Active Publication Date: 2021-11-16
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to disclose a water body remediation method based on silicified zero-valent iron activated persulfate, so as to improve the defects of easy deactivation, poor cycle performance and dissolution of secondary pollutants in the existing iron-based activated persulfate technology

Method used

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  • A water restoration method based on silicified zero-valent iron activated persulfate
  • A water restoration method based on silicified zero-valent iron activated persulfate
  • A water restoration method based on silicified zero-valent iron activated persulfate

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Effect test

Embodiment 1

[0034] Get 10 grams of reduced micron iron powder and 0.64g layered sodium disilicate and mix and place it in a ball mill jar, and ball mill it under a vacuum environment for 4 hours. wxya BM ) as a control, washed and dried. Carry out X-ray photoelectron spectroscopy and infrared spectroscopic analysis to both surface chemical compositions (see figure 1 , figure 2 shown), Si-mZVI BM Significant silicon content exists at the surface interface.

[0035] Take 100 mL of simulated antibiotic (sulfamethazine) polluted water body with a concentration of 10 mg / L as the remediation object, and add 0.02 g of the ball-ground iron prepared above and 1.5 mM sodium persulfate to it. Under constant temperature condition, rotating speed is 200rpm / min shaker reaction, after regular sampling, measure sulfamethazine content with high performance liquid chromatography, the result is as follows image 3 shown. After 32 minutes of reaction, the removal rate of sulfamethazine in the zero-val...

Embodiment 2

[0037] Take 10 grams of reduced micron iron powder, add 0, 0.16, 0.33, 0.66, 1, 2.6 g of sodium silicate respectively and mix them in a ball mill jar, ball mill for 5 hours in a vacuum environment, the ball mill speed is 550rpm / min, wash and dry Dry, respectively marked as mZVI BM 、1#Si-mZVI BM 、2#Si-mZVI BM 、3#Si-mZVI BM 、4#Si-mZVI BM and 5#Si-mZVI BM .

[0038] Take 100mL of simulated dichlorophenol polluted water with a concentration of 10mg / L as the remediation object, add 0.03g of the above-mentioned ball-ground iron sample and 2mM potassium persulfate to it, and react on a shaking table at a constant temperature with a rotating speed of 200rpm / min. After regular sampling, measure the dichlorophenol content with liquid phase, the results are as follows: Figure 4 shown. 4#Si-mZVI after 60min reaction BM and 5#Si-mZVI BM The removal rate of p-dichlorophenol reaches 95%, 2#Si-mZVI BM 、3#Si-mZVI BM The efficiency of activated persulfate to remove dichlorophenol wa...

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Abstract

A water restoration method based on silicified zero-valent iron activating persulfate: using silicified micron zero-valent iron as a catalytic activator and persulfate as an oxidizing agent to treat organic wastewater, and the molar ratio of the catalytic activating agent to the oxidizing agent is 1 :0.5‑3. The invention adds silicide zero-valent iron and persulfate to the pollution to be treated to oxidize and remove organic pollutants, and the surface of the silicide zero-valent iron is rich in silanol groups (≡Si-OH). The method can solve the problems of easy deactivation of iron-based materials and insufficient release of ferrous ions in the traditional activated persulfate system, has high repair efficiency and is environmentally friendly, and is suitable for the treatment and repair of various organic polluted wastewater and groundwater.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental materials and restoration of polluted water, in particular to a water restoration method based on silicified zero-valent iron activated persulfate. Background technique [0002] Utilizing the strong electron-donating ability of zero-valent iron, the technology of using zero-valent iron to activate persulfate has become a very promising technology in the treatment of refractory organic pollutant wastewater. This technology can generate sulfate radicals that are stronger than hydroxyl radicals, and they have a long lifetime and certain selectivity. The heterogeneous activation technology based on zero-valent iron can alleviate the uncontrollable reaction rate in the homogeneous ferrous system, the rapid hydrolysis and precipitation of iron ions, the introduction of anions that can quench free radicals, and the secondary damage caused by iron-containing sludge. pollution etc. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F101/30
CPCC02F1/725C02F2101/30
Inventor 郑明霞虞敏达苏婧何小松赵昕宇孙源媛傅雪梅
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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