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

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Problems solved by technology

The remediation of soil and groundwater contaminated by DNAPL has become a

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

Example Embodiment

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

[0027] Specific steps are as follows:

[0028] (1) Weigh 1.39g FeSO 4 ·7H 2 Dissolve O and 2.256g starch in 100mL of anaerobic water, put them in a three-necked flask, pass N 2 Stir for 15min;

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

[0030] (3) Observe the reaction until no bubbles are generated, and continue to pass in N 2 , Then add 0.237g of NiCl 2 ·6H 2 O into a three-necked flask, replace 20% of Fe, stop the reaction after 15 minutes of reaction, theoretically obtain a nano-Fe / Ni bimetal containing 0.224g of Fe and 0.058g of Ni, and the theoretical m...

Example Embodiment

[0032] Example 2: Experiment on the degradation of trichloroethylene by starch-loaded iron-nickel bimetallic nanoparticle dechlorination composite material

[0033] The specific experimental steps are as follows:

[0034] Weigh 0.3g, 0.5g, 0.7g, 0.9g, 1.1g, 1.3g of the starch-loaded iron-nickel bimetallic nanoparticles prepared in Example 1 into 6 bottles of 40mL trichloroethylene solution (concentration of 73ppm) Serum bottles, numbered 1-6, contained 40 mL of trichloroethylene solution (73 ppm) without dechlorination composite material as a blank control. Put it at room temperature and stir (650rpm) for 10h to test the dechlorination and degradation effect, such as figure 2 As shown, except for No. 1, the degradation efficiency of trichloroethylene in all samples is above 80%, and the optimal dosage is 0.7g, and the degradation efficiency of trichloroethylene can reach 97.2% within 10 hours.

Example Embodiment

[0035] Example 3: Experiment on degradation of chloroform by starch-loaded iron-nickel bimetallic nanoparticle dechlorination composite material

[0036] The specific experimental steps are as follows:

[0037] Weigh 0.3g, 0.5g, 0.7g, 0.9g, 1.1g, 1.3g of the starch-loaded iron-nickel bimetallic nanoparticles prepared in Example 1 into 6 serum bottles containing 40mL of chloroform solution (concentration of 75ppm) No. 1-6, with 40mL chloroform solution (75ppm concentration) without adding dechlorination composite material as blank control. Put it at room temperature and stir (650rpm) for 10h to test the dechlorination and degradation effect, such as image 3 As shown, except for No. 1, the degradation efficiency of chloroform in all samples is above 80%, and the optimal dosage is 0.7g. The degradation efficiency of chloroform can reach 95.6% within 10 hours.

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Abstract

The invention relates to a starch-loaded nano-iron-nickel high-efficiency dechlorination composite material which can be used for treating chlorinated hydrocarbon organic pollutants in groundwater and a preparation method thereof. The dechlorination composite material uses sodium borohydride as a reducing agent to reduce ferrous sulfate, replaces a part of nano-iron with nickel chloride as a nano-iron-nickel bimetal, uses starch as a carrier, and obtains a high-efficiency dechlorination through a liquid phase reduction method. Chlorine composites. The starch-loaded nano-iron-nickel bimetal composite material prepared by the present invention can not only protect the dechlorination performance of the nano-iron-nickel bimetal by utilizing the reducibility of starch, but also avoid the agglomeration of the nano-iron-nickel bimetal, increase the size of the nano-iron The specific area of ​​nickel bimetal enhances the adsorption of target pollutants, thereby promoting the efficient reduction and dechlorination effect of nano-iron-nickel bimetal on trichlorethylene and chloroform.

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
CPCB01J31/06B01J35/0053B01J35/006B01J35/0093C02F1/70C02F2101/36
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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