Chinese Academy of Sciences to develop new airgel provide new materials to improve the efficiency of oil in water
May 21, reporters learned that the city pollution Institute of Urban Environment, Chinese Academy of transformation Laboratory Zheng Yuming research team using a new electrostatic spinning – to receive technical support dispersion to interfacial chemistry-related theory, developed a high performance carbon nanofibers / graphene composite oxide airgel (CNF / GOAs). CNF / GOAs exhibit a high oil absorption capacity (120-286 times their own weight), inside a one-dimensional carbon nanofibers with graphene oxide sheets are assembled to form a two-dimensional open pore network, having excellent mechanical properties, by direct combustion or mechanical crushing recycling manner. This study provides new materials to improve the efficiency of oil in water, also provides a new idea for the three-dimensional fiber microstructure design and control. June 2017, the Indian Ocean with a major oil spill, a ship carrying more than 5,000 tons of crude oil tanker sank once again highlighted the development of effective control of oil spill urgency. Oil spill will seriously affect people and the environment, so far, has developed a number of oil spill remediation technology, such as oil booms, skimmers, oil-absorbing agents, diffusion, combustion and biodegradation. Compared with other technologies, physical adsorption method is considered to be the easiest, most economical way, you can quickly remove oil spill in the emergency treatment, the less impact on the environment. However, the oil absorption capacity and selectivity with industrial oil absorbent polypropylene generally poor. Many researchers have over the oil spill sorbent dedicated to designing high absorption rate and high selectivity. Wherein the carbon-based aerogels because of its ultra-low density, high porosity and widespread concern. Biological carbon airgel (CAs), although relatively inexpensive, environmentally friendly, but tend to have a low adsorption capacity and poor mechanical strength. In order to improve the mechanical strength, typically single-layer graphene (a unique two-dimensional (2D) structure) CNT-based airgel added. Three-dimensional structure of the airgel due to assembly requires a higher bulk density, carbon nanotubes, and graphene large consumption significantly increases production costs. Currently, the preparation of three-dimensional electrospinning nanofiber airgel has been widespread attention, but the tedious process of preparation, preparation stringent conditions. Accordingly, there is a need for an easier way to construct based on the electrical nanofibers CAs. Petrochemical industry is an important pillar industry, plays an important role in national economic development; but triggered in oil production, transportation, refining and other oil spills during the aquatic environment and will bring serious harm to human health; overflow major treatment methods for oil accidentsIn its simple physical absorption method, a small secondary pollution, the water can quickly transfer oil and other advantages, have been widely used; but using a commercial low absorption capacity of the absorption felt present, poor selectivity, easy recycling insufficient; therefore , develop a high absorption capacity and oil absorbent material for use renewable important. The oil pollution serious health water environment, it is necessary to design over the oil absorbent having a large absorption capacity and a high selectivity to effectively purify contaminated water. To absorb the oil prepared high-performance carbon airgel has attracted more and more attention, but challenges remain. This article describes a simple mechanical strength enhancing dimensional (3d) preparing a nanofiber airgel, mainly the auxiliary liquid collected by the support agent – electrospinning technique, according to the liquid – solid interface theory, dipping nanofibers measured impregnating ability. Especially electrospun polyacrylonitrile (PAN) nanofiber (NFS) were collected directly in the graphene oxide (go) in the aqueous dispersion, in a continuous electrospinning process and fiber backbone dimensional (2d) go assembled sheet an open porous network is formed, substantially avoid the tedious preparation step (nanofiber membrane was cut and re-crosslinking) before use. Due to the open porous network to ensure the structural stability of the airgel, airgel required during stacking feed amount is greatly reduced in the subsequent freeze-drying process is not strict requirements pre-freezing temperature and pre-freeze mode. Further, after the heat treatment pan nf / go airgel composite was obtained fluffy carbon nanofibers / go airgel (cnf / goas), surplus display density (2-3mg / ml) and great compressibility (80%). After vapor deposition of a polydimethylsiloxane modified hydrophobicity, CNF / goas having a high absorptive capacity (120-286 wt / wt) of various oils. As the fire performance, flexibility, simply by burning or mechanical extrusion can be recovered, after 10 cycles still has a large absorption capacity, large-scale application. related to research Facile synthesis of electrospun carbon nanofiber / graphene oxide composite aerogels for high efficiency oils absorption was published in Environment International, 128, 37-45. The urban environment Master Lin Ying being the first author, researcher Zheng Yuming corresponding author. The study was funded by the National Natural Science Foundation of China (51578525) of.