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High efficient dechlorination composite material and preparation method thereof

A composite material, dechlorination technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, water/sludge/sewage treatment, etc. Low cost, avoid agglomeration, increase the effect of specific area

Inactive Publication Date: 2016-12-07
ZHONGKE DINGSHI ENVIRONMENTAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The remediation of soil and groundwater contaminated by DNAPL has become a research hotspot abroad, but there are few domestic research reports on it

Method used

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  • High efficient dechlorination composite material and preparation method thereof
  • High efficient dechlorination composite material and preparation method thereof
  • High efficient dechlorination composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Preparation of starch-loaded iron-nickel bimetallic nanoparticles dechlorination composite material

[0027] Specific steps are as follows:

[0028] (1) Weigh 1.39g FeSO 4 ·7H 2 O and 2.256g of starch were dissolved in 100mL of anaerobic water, put into a three-necked flask, and passed through N 2 Stir for 15 minutes;

[0029] (2) Dispense 100mL of 0.8mol / L NaBH with a separatory funnel 4 The solution was slowly added dropwise to the Fe 2+ In the solution, a large amount of gas is generated during the dropwise addition reaction, and the N 2 , stirred for 15min, the generated H 2 Drive away in time; the theoretically obtained mass of zero-valent nano-Fe is 0.28g;

[0030] (3) Observe the reaction until no bubbles are generated, and continue to feed N 2 , then add 0.237g of NiCl 2 ·6H 2 0 to the three-necked flask, replace 20% Fe, react 15min to stop the reaction, theoretically obtain the nano-Fe / Ni bimetal containing 0.224g Fe, 0.058g Ni, and the the...

Embodiment 2

[0032] Example 2: Dechlorination experiment of starch-loaded iron-nickel bimetallic nanoparticles dechlorinated composite material to degrade trichlorethylene

[0033]The specific experimental steps are as follows:

[0034] Weigh respectively the starch-loaded iron-nickel bimetallic nanoparticles prepared in Example 1 0.3g, 0.5g, 0.7g, 0.9g, 1.1g, 1.3g and put into 6 bottles of trichlorethylene solution (concentration is 73ppm) that 40mL is housed respectively Serum bottles, numbered 1-6, were filled with 40 mL of trichlorethylene solution (concentration: 73 ppm) without adding the dechlorination composite material as a blank control. Place room temperature stirring (650rpm) to test the dechlorination degradation effect after reacting for 10h, such as figure 2 As shown, except No. 1, the degradation efficiency of trichlorethylene in all samples is above 80%, the optimal dosage is 0.7g, and its degradation efficiency of trichlorethylene can reach 97.2% within 10 hours.

Embodiment 3

[0035] Example 3: Dechlorination experiment of starch-loaded iron-nickel bimetallic nanoparticles dechlorination composite material to degrade chloroform

[0036] The specific experimental steps are as follows:

[0037] Take by weighing respectively the starch-loaded iron-nickel bimetallic nanoparticles 0.3g, 0.5g, 0.7g, 0.9g, 1.1g, and 1.3g prepared in Example 1 and put into 6 bottles of chloroform solution (concentration is 75ppm) serum bottles that are equipped with 40mL Among them, No. 1-6, 40 mL of chloroform solution (concentration of 75 ppm) was filled with no dechlorination composite material as a blank control. Place room temperature stirring (650rpm) to test the dechlorination degradation effect after reacting for 10h, such as image 3 As shown, except No. 1, the degradation efficiency of chloroform in all samples is above 80%, the optimal dosage is 0.7g, and its degradation efficiency to chloroform can reach 95.6% within 10 hours.

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Abstract

The invention relates to a high efficient dechlorination composite material and a preparation method thereof. The composite material can be used to process underground water containing chlorocarbon organic pollutants and is prepared by loading nano iron-nickel on starch. The dechlorination composite material is prepared by the following steps: taking sodium borohydride as the reducing agent to reduce ferrous sulfate, using nickel chloride to replace part of nano iron to obtain iron-nickel dual metals, taking starch as the carrier, and obtaining the high efficient dechlorination composite material through a liquid phase reduction method. The prepared starch-loaded nano iron-nickel composite material has the advantages that the reducing property of starch is utilized to protect the dechlorination performance of nano iron-nickel, at the same time, starch can prevent the agglomeration of iron-nickel, the specific surface area of iron-nickel is enlarged, the adsorption on target pollutants is enhanced, and thus the high efficient reduction and dechlorination effect of nano iron-nickel on trichloroethylene and chloroform is strengthened.

Description

technical field [0001] The invention relates to the development of a composite reagent for in-situ restoration of groundwater containing chlorinated hydrocarbon pollutants, specifically a starch-loaded nano-iron-nickel bimetallic dechlorination composite material and a preparation method thereof, belonging to the technical field of water treatment . Background technique [0002] According to the solubility of pollutants, pollutants in groundwater can be divided into soluble pollutants and insoluble pollutants. Soluble pollutants are mostly inorganic substances and organic substances with high water solubility, and most studies focus on such pollutants; insoluble pollutants are organic hydrocarbons slightly soluble in water, which are immiscible with water After contact with water, it will form an obvious layered state. According to its density, it can be divided into low-density non-aqueous phase liquid (Light non-aqueous phase liquid, LNAPL) and high-density non-aqueous ph...

Claims

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Application Information

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IPC IPC(8): B01J31/06C02F1/70C02F101/36
CPCC02F1/70B01J31/06C02F2101/36B01J35/392B01J35/393B01J35/399
Inventor 付明来杨勇谢蝶殷晓东黄海张文徐峰
Owner ZHONGKE DINGSHI ENVIRONMENTAL ENG CO LTD
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