A kind of method and its application of preparing nano zero valent iron suspension with green tea
A nano-zero-valent iron and suspension technology, which is applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of poor suspension stability, low production cost, and high preparation cost, and achieve good results. The effect of transportation capacity, non-toxic and non-polluting raw materials, simple process and environmental protection
Inactive Publication Date: 2018-04-10
INST OF HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CHINESE ACAD OF GEOLOGICAL SCI
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
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 ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| particle size | aaaaa | aaaaa |
| particle size | aaaaa | aaaaa |
| clearance rate | aaaaa | aaaaa |
Login to View More
Abstract
A method for preparing nano-zero valent iron with green tea and application of suspension thereof, the process steps of the method are: A. preparing green tea leaching solution, B. preparing ferric chloride solution, and C. preparing green tea nano-zero valent iron suspension . The GT-NZVI prepared by the invention has good suspension stability, simple preparation process, low cost, green environmental protection, good stability, strong penetrating ability in aquifers, and fast removal rate of hexavalent chromium in sewage and groundwater. Remove the merits outright.
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(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