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• Time of issue:2019-12-09
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(Summary description)Low-temperature plasma-modified grafting is a treatment technology that has a short treatment time, does not produce chemical pollution, does not damage the overall volume structure of the material, and only changes the surface properties of the material. In recent years, the research group of Chen Changlun, Shao Dadong, Hu Jun, Wang Xiangke, etc. of the “Cryogenic Plasma Application Research Lab” of the Institute of Plasma has used low temperature plasma technology to modify the surface of carbon nanotubes, which has overcome the difficulties The problems caused by solubility have greatly improved its practical application. After modifying and assembling carbon nanotubes with low -temperature plasma technology, the research group applied them to environmental pollutant detection and treatment research and achieved a series of results.
The first is to use Ar / H2O, Ar / NH3, and Ar / O2 microwave plasma to surface-treat carbon nanotubes to introduce oxygen-containing, amino-containing functional groups on the surface, and improve the hydrophilicity and carbon nanotubes. Dispersibility makes it possible to prepare nano solutions. These processed (surface-modified) functionalized materials have good application prospects for improving the adsorption of carbon nanotubes on biological and environmental pollutants. Some research results were published in Applied Physics Letter (2010, 96, 131504); Carbon (2010, 48, 939-948); The Journal of Physical Chemistry C (2009, 113, 7659-7665); Diamond & Related Materials (in press ); And was invited to make 2 oral presentations at international conferences .
Second, the surface of carbon nanotubes is activated by N2 radio frequency plasma, and then organic monomers and natural polymer materials are grafted to prepare carbon nanotube / organic composite materials. The surface of the composite material prepared by plasma has various functional groups. These functional groups have strong adsorption and complexation ability to persistent organic pollutants (POPs), toxic and harmful heavy metal ions, and radionuclides, thereby improving the composition. Material's ability to adsorb pollutants. Some research results were published in The Journal of Physical Chemistry B (2009, 113, 860-864); Chemosphere (2010, 79, 679-685); Plasma Processes and Polymers (in press, and selected as cover) .
The third reason is that the small size of carbon nanotubes makes it difficult to recover and recycle nanomaterials after adsorbing and treating organic / inorganic pollutants. The traditional centrifugation method requires a high rotation speed, and the filtration method is liable to cause clogging of the filtration membrane. If carbon nanotubes that adsorb pollutants enter the environment, secondary pollution will occur. In response to the above problems, the research group used a sol-gel method to first assemble iron oxides on carbon nanotubes, and then activated the carbon nanotube / iron oxide surface with N2 RF plasma, and grafted organic monomers And natural macromolecular materials to prepare magnetic multiple composite nanomaterials. The magnetic composite nanomaterials not only have high adsorption performance, but also the magnetic separation technology can simply and conveniently separate magnetic composite nanomaterials from solution, which solves the solid-liquid problem. Separated problems can be applied to practical work at the same time. Some rcelated research results were published in Environmental Science and Technology (2009, 43, 2362-2367); Journal of Hazard Material (2009, 164, 923-928); Journal of Physical Chemistry B (jp-2009-11424k).
This work has been supported by the National Natural Science Foundation of China, the Ministry of Science and Technology's 973 major research plan "Application of Nanomaterials for Trace Detection and Treatment of Persistent Toxic Pollutants", a major project of the Hefei Institute of Material Science of the Chinese Academy of Sciences, a talent project of Hefei Research Institute, and Spark The project, the Chinese Academy of Sciences Key Laboratory Fund for New Thin Film Solar Cells and other funds.
Material surface modification, plasma treatment instrument Tel: 0519- 86900935 8666730.