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Charcoal load nanometer zero-valent iron activated sodium persulfate system and preparation and application thereof

A nano-zero-valent iron and sodium persulfate technology, which is applied in chemical instruments and methods, pathogenic microorganism wastewater treatment, special compound water treatment, etc., can solve the problems of difficult recycling and reuse, low efficiency of sodium persulfate, etc., and achieve enhanced The effect of reusability, high utilization rate, and simple process

Inactive Publication Date: 2018-08-24
徐建
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem: The object of the present invention is to provide a kind of biochar loaded nanometer zero valent iron activated sodium persulfate system and its preparation and application, this biochar loaded nanometer zero valent iron activated sodium persulfate system is the combination of nano zero Sodium persulfate is activated after the carbon is compounded. Since the nano-zero-valent iron particles have a larger surface area than zero-valent iron, they can fully contact with sodium persulfate, and the adhesion on the surface of the biochar can well fix the nano-zero-valent iron. Particles, successfully solved the problems of low efficiency of zero-valent iron activation of sodium persulfate in the prior art, and it is not easy to recycle and reuse.

Method used

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  • Charcoal load nanometer zero-valent iron activated sodium persulfate system and preparation and application thereof
  • Charcoal load nanometer zero-valent iron activated sodium persulfate system and preparation and application thereof
  • Charcoal load nanometer zero-valent iron activated sodium persulfate system and preparation and application thereof

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preparation example Construction

[0036]The method for preparing biochar-supported nanometer zero-valent iron activating and activating sodium persulfate oxidation system (nZVI / BC-PS) according to the present invention comprises the steps of adding sodium borohydride dropwise under the protection of nitrogen by using a liquid phase reduction method Reducing ferrous sulfate into nano-zero-valent iron, in the high-speed agitated nano-zero-valent iron biochar mixed liquid, tiny nano-zero-valent iron particles continue to adhere to the shape and structure of the biochar. The obtained biochar-loaded nano-zero-valent iron activation material is evenly dispersed in the organic-contaminated solution, and sodium persulfate solution is added to the solution to form the nZVI / BC-PS oxidation system, and the nano-zero-valent iron adhered to the biochar It can effectively activate sodium persulfate to produce strong oxidizing sulfate radicals and hydroxyl radicals. The nZVI / BC-PS oxidation system can remove various refracto...

Embodiment 1

[0040] A preparation method for activated sodium persulfate system loaded with nanometer zero-valent iron on biochar, comprising the following steps:

[0041] (1) Cut the peanut shells into pieces and burn them in an anaerobic muffle furnace at 350°C for 2 hours. After pyrolysis and cooling, they are ground and pulverized to make powdery biochar Ⅰ;

[0042] (2) Acidify the biochar with high-grade hydrochloric acid with a mass concentration of 10% for 12 hours, remove the ash, wash it with deionized water three times, and dry it in an oven at 60°C to obtain powdered biochar II;

[0043] (3) Weigh 3.0g FeSO 4 ·7H 2 O was dissolved in 20 mL of deionized water stripped with nitrogen, then poured into a reaction vessel containing 1.0 g of powdered biochar II, stirred continuously under nitrogen atmosphere at a stirring rate of 150 r / min, and after mixing evenly, 60 mL of water ethanol, keep V 无水乙醇 :V 水 = 3:1, then add 50mL 20mg / L NaBH dropwise at a rate of 1-2 drops per second ...

Embodiment 2

[0048] A preparation method for activated sodium persulfate system loaded with nanometer zero-valent iron on biochar, comprising the following steps:

[0049] (1) Cut the peanut shells into pieces and burn them in an anaerobic muffle furnace at 450°C for 2 hours. After pyrolysis and cooling, they are ground and pulverized to make powdery biochar;

[0050] (2) Acidify the biochar with high-grade hydrochloric acid with a mass concentration of 10% for 12 hours, remove the ash, wash it with deionized water for 3 times, and dry it in an oven at 60°C for later use;

[0051] (3) Weigh 3.0g FeSO 4 ·7H 2 O was dissolved in 20 mL of deionized water stripped with nitrogen, then poured into a reaction vessel containing 1.0 g of powdered biochar II, stirred continuously under nitrogen atmosphere at a stirring rate of 150 r / min, and after mixing evenly, 60 mL of water ethanol, keep V 无水乙醇 :V 水 = 3:1, then add 50mL 20mg / L NaBH dropwise at a rate of 1-2 drops per second using a separatory...

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Abstract

The invention relates to a charcoal loading nanometer zero-valent iron activated sodium persulfate system and preparation and application thereof. Firstly, biomass is burned into charcoal, the charcoal is cleaned and dried after being acidized, and added into a ferrous sulphate solution taking absolute ethyl alcohol and water as a dispersing agent for being stirred fully, then a sodium borohydridesolution is added dropwise to generate the charcoal loading nanometer zero-valent iron; lastly, a composite material prepared with pure water and ethyl alcohol is washed and dried, the obtained charcoal loading nanometer zero-valent iron activated material is placed in the solution, after ultrasonic treatment is carried out, the material is uniformly dispersed in the solution, at the moment, a sodium persulfate solution is added, the mixture is mixed evenly to obtain the charcoal loading nanometer zero-valent iron activated sodium persulfate system. The oxidation system is used for reducing waste, polluted surface water and target pollutants in the underground water, and the problems of the agglomeration and lower activity of sodium persulfate during the use of the nanometer zero-valent iron are solved.

Description

technical field [0001] The invention relates to a biochar loaded nanometer zero-valent iron activated sodium persulfate system and its preparation and application, belonging to the field of material preparation and water treatment. Background technique [0002] Printing and dyeing wastewater has the characteristics of complex composition, high organic content, and large water quality changes. Direct discharge poses a great safety hazard to the ecological environment and human health, and at the same time causes a waste of water resources. Azo dyes are organic pollutants that often appear in printing and dyeing wastewater. Direct black is a typical azo dye, which is mostly used for dyeing cotton fabrics, silk, wool, etc. The unreasonable disposal of direct black in industrial wastewater will seriously threaten and affect biodiversity and human living environment. However, traditional water treatment processes are difficult to discharge such organic wastewater up to standard. ...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F103/06
CPCC02F1/72C02F2103/003C02F2103/06C02F2305/023
Inventor 徐建张学良孙成杨绍贵何欢
Owner 徐建
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