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Method for repairing heavy metal contaminated soil by modified nanoscale zero-valent iron synergizing with microorganisms

A technology of nano-zero-valent iron and microbial remediation, applied in the restoration of polluted soil, etc., can solve the problems of enhanced adsorption, reduction and fixation of soil heavy metals, accelerated nano-iron corrosion, easy passivation of nano-zero-valent iron, etc., to achieve enhanced Dispersibility and oxidation resistance, good economic value, and high production efficiency

Inactive Publication Date: 2018-11-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses cheap, easy-to-obtain, and biodegradable carboxymethyl cellulose to modify nano-zero-valent iron to improve its dispersibility and oxidation resistance, and at the same time cooperate with anaerobic microorganisms to solve the problem of easy passivation of nano-zero-valent iron. The action of microorganisms blocks the direct contact between air and nano-iron, accelerates the corrosion of nano-iron and induces ferrous ions to generate highly active minerals on its surface through the extracellular polymer of microorganisms, enhancing its adsorption, reduction and fixation of soil heavy metals

Method used

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  • Method for repairing heavy metal contaminated soil by modified nanoscale zero-valent iron synergizing with microorganisms
  • Method for repairing heavy metal contaminated soil by modified nanoscale zero-valent iron synergizing with microorganisms
  • Method for repairing heavy metal contaminated soil by modified nanoscale zero-valent iron synergizing with microorganisms

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Embodiment 1

[0032] A kind of preparation method of carboxymethyl cellulose modified nano zero valent iron, it comprises the following steps:

[0033] Preparation of carboxymethyl cellulose modified nanometer zero-valent iron (CMC-nFe) by liquid phase reduction method 0 ): Under nitrogen protection, 50mL of CMC solution with a mass concentration of 0.5% and 100mL of FeSO with a concentration of 0.05mol / L 4 ·7H 2 O Stir and mix well (FeSO 4 ·7H 2 The mass ratio of O to CMC is 5.6:1); then under stirring (300r / min), add 100mL of NaBH with a concentration of 0.15mol / L dropwise at a speed of 1mL / min 4 solution until no bubbles are produced and then continue to stir for 20 minutes to ensure that the reaction is complete. After washing with absolute ethanol and deoxygenated water to neutrality, the CMC-nFe with a concentration of 1g / L is obtained. 0 The suspension is stored in a brown bottle for later use.

[0034] Unmodified nano zero valent iron (nFe 0 ): Using the same method as above b...

Embodiment 2

[0048] A kind of preparation method of carboxymethyl cellulose modified nano zero valent iron, it comprises the following steps:

[0049] Preparation of carboxymethyl cellulose modified nanometer zero-valent iron (CMC-nFe) by liquid phase reduction method 0 ): Under nitrogen protection, 50mL of CMC solution with a mass concentration of 0.5% and 100mL of FeSO with a concentration of 0.05mol / L 4 ·7H 2 O Stir and mix well (FeSO 4 ·7H 2 The mass ratio of O to CMC is 5.6:1); then under stirring (300r / min), add 100mL of NaBH with a concentration of 0.15mol / L dropwise at a speed of 1mL / min 4 solution until no bubbles are produced and then continue to stir for 20 minutes to ensure that the reaction is complete. After washing with absolute ethanol and deoxygenated water to neutrality, the CMC-nFe with a concentration of 1g / L is obtained. 0 The suspension is stored in a brown bottle for later use.

[0050] A method for modifying nano-zero-valent iron to cooperate with microorganism...

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Abstract

The invention belongs to the technical field of heavy metal contaminated soil repair, and discloses a method for repairing heavy metal contaminated soil by modified nanoscale zero-valent iron synergizing with microorganisms. The method comprises the following steps that (1) carboxymethyl cellulose is used as a modifier, a liquid phase reduction method is adopted, and a water-soluble salt containing Fe is subjected to reduction by using a reducing agent to obtain carboxymethyl cellulose modified nanoscale zero-valent iron; and (2) the carboxymethyl cellulose modified nanoscale zero-valent iron,anaerobic microorganisms, water and the heavy metal contaminated soil are uniformly mixed and stood for reaction, and the repair of the heavy metal contaminated soil is completed. The modified nanoscale zero-valent iron has high dispersibility and oxidation resistance, corrosion of the zero-valent iron is accelerated and high-activity minerals are generated through the synergistic effect with themicroorganisms, and the effect of the modified nanoscale zero-valent iron on repairing the heavy metal contaminated soil is further improved. The method for repairing the heavy metal contaminated soil by the modified nanoscale zero-valent iron synergizing with the microorganisms has the advantages of high processing efficiency, simple process conditions, less secondary pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of ecological restoration of heavy metal-contaminated soil environment, and in particular relates to a method for modifying nanometer zero-valent iron to cooperate with microorganisms to restore heavy metal-contaminated soil. Background technique [0002] In recent years, with the rapid development of industrialization and urbanization, a large number of heavy metal elements such as chromium, cadmium, lead, etc. have been used in metal processing, electroplating, leather, printing and dyeing, electronics and other industries. Due to production leakage, wanton discharge of wastewater and infiltration of waste residues, the soil around such enterprises is seriously polluted by heavy metals. Heavy metal elements stay in the soil for a long time and are not easy to leach with water or be biodegraded; when heavy metals in the soil accumulate to a certain extent, they are easily transferred to crops and further en...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/08B09C1/10B09C2101/00
Inventor 吴锦华方一莉苏眉李平
Owner SOUTH CHINA UNIV OF TECH
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