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Method for preparing nanometer zero-valent iron with slow release effect by lagerstroemia indica

A nano-zero-valent iron and crape myrtle technology, applied in the field of nano-materials, can solve the problems of lower repair efficiency, easy oxidation and corrosion, etc., achieve low cost, improve comprehensive repair efficiency, and promote degradation effects

Inactive Publication Date: 2018-03-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The strong reducibility of nano-zero-valent iron makes it easy to be oxidized and corroded during the repair process, forming a passivation layer and reducing its repair efficiency

Method used

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  • Method for preparing nanometer zero-valent iron with slow release effect by lagerstroemia indica
  • Method for preparing nanometer zero-valent iron with slow release effect by lagerstroemia indica
  • Method for preparing nanometer zero-valent iron with slow release effect by lagerstroemia indica

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Experimental program
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Effect test

Embodiment 1

[0024] Step (1) Preparation of crape myrtle fruit extract: add crape myrtle fruit into deionized water according to the ratio of 20-50g crape myrtle fruit / 500mL deionized water, heat in a water bath at 80°C for 30min under sealed conditions, filter after the temperature drops to room temperature, and obtain Extract of crape myrtle fruit with a concentration range of 0.004-0.01g / mL;

[0025] Step (2) preparation of iron salt solution: dissolve the iron salt solid in deionized water to prepare 0.3mol / L FeSO 4 solution;

[0026] Step (3) prepares crape myrtle nano zero-valent iron suspension: the FeSO 4 The solution was added to the Erlenmeyer flask, placed on a magnetic stirrer and stirred at room temperature, according to FeSO 4 The volume ratio of the solution and the crape myrtle fruit extract is 1:2. Add 0.5L to 1L of the crape myrtle fruit extract to the conical flask, and continue to stir for 15 minutes after adding the crape myrtle fruit extract to obtain the crape myrt...

Embodiment 2

[0031] The nanometer zero-valent iron material prepared by the present invention is subjected to a Cr(VI) removal rate experiment. Take 1g of the nano-zero-valent iron material prepared by this patent and add it to 100ml of weakly acidic hexavalent chromium solution with a concentration of 0.1g / L, put it into a constant temperature oscillation box at 25°C and shake it at 150r / min for 2h , to complete the adsorption. The concentration of Cr(VI) in the water body was measured by atomic absorption method by sampling every 10 minutes, and the Cr(VI) removal curve of the material was obtained.

Embodiment 3

[0033] The nanometer zero-valent iron material prepared by the present invention is subjected to a removal rate experiment of trichlorethylene. Take 0.5g of the nano-zero-valent iron material prepared by this patent and add it to 10ml of trichlorethylene solution with a concentration of 0.1mg / L, put it into a constant temperature shaking box at 25°C and shake it at 150r / min for 2h, Adsorption is complete. Sampling every 10 minutes in the middle uses gas chromatography to measure the trichlorethylene concentration in the sample to obtain the trichlorethylene removal curve of the material.

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Abstract

The invention discloses a method for preparing nanometer zero-valent iron with a slow release effect by lagerstroemia indica. The method comprises the process steps of: (1) preparation of lagerstroemia indica extracting solution; (2) preparation of FeSO4 solution; (3) preparation of lagerstroemia indica nanometer zero-valent iron suspension; and (4) preparation of a lagerstroemia indica nanometerzero-valent iron material. Compared with general nanometer zero-valent iron, the prepared lagerstroemia indica nanometer zero-valent iron greatly improves the form and the repair performance, and is low in preparation cost, green and simple in process, excellent in removing effect of Cr (VI) and trichloroethylene in sewage and excellent in popularization and application potential.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a method and application of green synthesis of nanometer zero-valent iron with slow-release effect. Background technique [0002] Due to its large specific surface area and strong reducing ability, nanometer zero-valent iron has been widely used to remediate soil and water pollution. At present, the common method for preparing nano-zero-valent iron is liquid-phase reduction method, that is, using a strong reducing agent such as NaBH 4 、KBH 4 Fe in solution 3+ or Fe 2+ The ions are reduced to zero-valent iron particles. However, as a widely used soil and water remediation agent, nano-zero-valent iron uses a large amount of NaBH 4 、KBH 4 The preparation of such reducing agents is not only expensive, but also the prepared waste liquid has certain toxicity to the organisms in the environment, which is easy to cause secondary pollution. Therefore, the development of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y40/00
CPCB82Y40/00B22F9/24B22F2009/245B22F1/07
Inventor 林爱军陶敏黄泽宇焦春磊赵越
Owner BEIJING UNIV OF CHEM TECH
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