Method for preparing NZVI (nano-scale zero-valent iron) suspension from green tea as well as application of suspension

A nano-zero-valent iron, suspension technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of low production cost, high preparation cost, poor suspension stability, etc. Good transportation ability, non-toxic and non-polluting raw materials, simple and environmentally friendly process

Inactive Publication Date: 2015-08-26
INST OF HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CHINESE ACAD OF GEOLOGICAL SCI
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Problems solved by technology

[0004] In order to solve the problems of high preparation cost and poor suspension stability of nano-zero-valent iron suspension in the prior art, the present invention studies a method for preparing nano-zero-valent iron with green tea, and prepares green tea nano-zero-valent iron by reducing ferric chloride with green tea extract. Valence iron, tea polyphenols in green tea can be used as a chelating agent and capping agent for nano-iron, which protects it from oxidation and agglomeration while reducing to generate nano-zero-valent iron. Nano-zero-valent iron suspension prepared from green tea extract Not only is the production cost low and the toxicity is low, but tea polyphenols can be used as nutrients to improve biodegradation, and the green tea nano-zero-valent iron suspension is used to remove hexavalent chromium in water

Method used

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  • Method for preparing NZVI (nano-scale zero-valent iron) suspension from green tea as well as application of suspension
  • Method for preparing NZVI (nano-scale zero-valent iron) suspension from green tea as well as application of suspension
  • Method for preparing NZVI (nano-scale zero-valent iron) suspension from green tea as well as application of suspension

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Embodiment 1

[0043] (1) Preparation of green tea zero-valent iron suspension:

[0044] A. In a 500mL beaker, add 30ml of deionized water and 300ml of absolute ethanol to form a mixed solution. Add 13.2g of green tea to the above mixed solution. The green tea is commercially available green tea, and then heated to 80°C. React at high temperature for 20 minutes, then move to a cell grinder, sonicate for 10 minutes at a duty ratio of 1:1 (breaking 10s / stopping 10s), and the ultrasonic frequency is 20KHz. Filter to obtain 300 mL of green tea eluate, and set aside;

[0045] B. In a 500mL beaker, add 30ml of deionized water and 300ml of absolute ethanol to form a mixed solution, and 8.927g of solid FeCl 3 ·6H 2 O was dissolved in the above mixed solution to obtain 330 mL of 0.1mol / L ferric chloride solution, which was set aside;

[0046] C. Take a 1000mL beaker and place it in an impeller stirrer, start stirring, and control the stirring rate to be 200r / min. When the ferric chloride solution ...

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Abstract

The invention discloses a method for preparing NZVI (nano-scale zero-valent iron) from green tea as well as an application of a suspension of the NZVI. The method comprises technological steps as follows: A, preparing a green tea dissolution solution; B, preparing a ferric trichloride solution; C, preparing the GT-NZVI (green tea-NZVI) suspension. The prepared GT-NZVI has the advantages of good suspension stability, simple preparation technology, low cost, environment-friendliness, good stability, high penetrability in an aquifer and capability of quickly and thoroughly removing hexavalent chromium in sewage and underground water.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanometer materials and removal of hexavalent chromium, and in particular relates to a method for preparing nanometer zero-valent iron suspension with green tea and its application for removing hexavalent chromium in water. Background technique [0002] Nano-scale Zero Valent Iron (NZVI) has the advantages of large specific surface area, strong adsorption capacity and high reaction rate constant. Nano-zero-valent iron can efficiently degrade chlorinated hydrocarbons, and can be directly injected into aquifers to repair groundwater pollution. It is currently the most promising remediation agent for chlorinated hydrocarbons in groundwater. 2+ 、Cu + 、Ag + , Hg 2+ , Cr(Ⅵ)(Cr 2 o 7 2- , CrO 4 2- ), etc. also have a good removal effect, and have great application potential in groundwater pollution remediation. However, the preparation cost is expensive, and the easy agglomeration in wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/70C02F1/28C02F1/62
Inventor 韩占涛马春晓吕晓立张威孔祥科
Owner INST OF HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CHINESE ACAD OF GEOLOGICAL SCI
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