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Composite material used for hexavalent chromium-contaminated water or soil remediation and preparation method thereof

A composite material and soil remediation technology, applied in the restoration of polluted soil, water pollutants, water/sewage treatment, etc., can solve the problems of high preparation and use costs

Active Publication Date: 2020-09-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some high-efficiency synthetic materials commonly reported (such as nano-zero-valent iron and nano-metal oxides, etc.) can quickly and effectively detoxify hexavalent chromium in the environment, their preparation and use costs are high. In addition, the subsequent environmental risks caused by them are also gaining more and more attention

Method used

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  • Composite material used for hexavalent chromium-contaminated water or soil remediation and preparation method thereof
  • Composite material used for hexavalent chromium-contaminated water or soil remediation and preparation method thereof
  • Composite material used for hexavalent chromium-contaminated water or soil remediation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 50.0 g of raw material montmorillonite was dispersed in hydrochloric acid solution with a mass concentration of 0.06%, and ultrasonicated for 120 min at a frequency of 40 KHz and a power of 200 W. Then wash 3-5 times with deionized water. Make a suspension with a solid-to-liquid ratio (g:ml) of 1:20, pass nitrogen gas (purity>99.9%) for 60 min, then add 6.95 g of ferrous sulfate heptahydrate, and stir magnetically for 30 min under nitrogen protection. Then add 0.25g sodium carboxymethyl cellulose under stirring action, stabilize 10min, then add sodium sulfide nonahydrate 6.0g under the protection of nitrogen (it can be added in the form of 60ml of sodium sulfide nonahydrate solution with a concentration of 0.5mol / L) ), the composite material was prepared, and after being stable for 6 hours, the solid-liquid was separated or made into a suspension with a certain concentration for use.

Embodiment 2

[0025] 50.0 g of raw material montmorillonite was dispersed in hydrochloric acid solution with a mass concentration of 0.06%, and ultrasonicated for 120 min at a frequency of 40 KHz and a power of 200 W. Then rinse with deionized water several times. A suspension was prepared at a solid-to-liquid ratio of 1:20 and passed through high-purity nitrogen for 60 minutes, then 13.90 g of ferrous sulfate heptahydrate was added, and magnetically stirred for 20 minutes under the protection of nitrogen. Then add 0.25g of sodium carboxymethyl cellulose under the action of stirring, stabilize for 10min, add 9.6g of sodium sulfide nonahydrate under the protection of nitrogen, and prepare the composite material. The suspension is ready for use.

Embodiment 3

[0027] The composite material obtained in Example 1 is used to remove hexavalent chromium in the aqueous solution, the initial concentration of hexavalent chromium in the solution is 46.3mg / L respectively, the solid-to-liquid ratio of the reaction system is 1:270, reacts at room temperature for 60min, detects 5 / 10 / 15 / 20 / 30 / 60min concentration of hexavalent chromium in the solution. The test results of the supernatant are shown in Table 1 below.

[0028]

[0029] Table 1 Experimental results of removing hexavalent chromium in water by composite materials

[0030] The results show that after the composite material prepared in Example 1 is mixed with water at a mass ratio of 1:270, the initial concentration is 46.3mg / L, and within 60min, it can rapidly remove hexavalent chromium in the aqueous solution to a lower level (0.12mg / L), the removal rate is above 99%, and this composite material greatly reduces the environmental risk of hexavalent chromium polluted water.

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Abstract

The invention discloses a composite material for remediation of hexavalent chromium contaminated water or soil, and a preparation method thereof, and provides an easy-to-operate, efficient, environment-friendly and economically-feasible remediation material for the hexavalent chromium contaminated water or soil. The composite material mainly comprises a framework material, namely montmorillonite.A reducing agent comprises nano ferrous sulfide, and sodium carboxymethylcellulose is used as a stabilizer for the nano ferrous sulfide. The preparation method of the composite material includes pretreating a certain amount of the montmorillonite, loading the nano ferrous sulfide onto interlayers and layer surfaces of the montmorillonite under reducing conditions and under the action of the stabilizer according to a coprecipitation process, and performing centrifugation or suction filtration to obtain the composite material. The composite material is proved to have an efficient hexavalent chromium removal effect.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a composite material for repairing hexavalent chromium polluted water or soil and a preparation method thereof. Background technique [0002] The scenes of chromium-contaminated sites in my country mainly include chrome ore production sites, chrome salt factories, chrome slag dumps, electroplating factories and production workshops of tanning factories. Chromium slag yards are places where production enterprises pile up chromium-contaminated waste, and relevant data show that there are 62 dumpsites and their legacy factories across the country. According to the pollution census in early 2014, there are 36 chromium salt factories nationwide, of which 10 are still in production and 26 are shut down. The treatment of chromium pollution in the soil and groundwater of these historical land plots and the factories still in production is a problem to be solved in the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/16C02F1/28B01J20/28B09C1/00C02F101/22
CPCB01J20/0262B01J20/16B01J20/28059B09C1/00C02F1/281C02F2101/22
Inventor 邹德勋李小飞郑旭升刘研萍
Owner BEIJING UNIV OF CHEM TECH