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Strategies to flash graphene petrochemical waste plastics

wallpapers Industry 2021-01-06
The flash graphene made of plastic in the Rice University laboratory starts with post-consumer plastic received by recyclers. It is then mixed with carbon black and processed into turbine layer graphene through AC and DC timing pulses.
Scientists at Rice University say this is a process of effective use of waste plastics, otherwise, it will exacerbate the earth's environmental dilemma. In this case, Rice chemist James Tour's laboratory modified its method of preparing flash graphene to enhance its ability to recycle plastic into graphene.
In short, the laboratory did not use direct current to increase the temperature of the carbon source as in the original process, but first exposed the plastic waste to high-intensity alternating current for about eight seconds, and then performed direct current oscillation.
The product is high-quality turbine layer graphene, a valuable soluble substance that can be used to reinforce electronic products, composite materials, concrete and other materials, and carbon oligomers. These molecules can be expelled from graphene for other uses.
He said: "We have to deal with this problem." "There is another problem: the microorganisms in the ocean that convert carbon dioxide into oxygen are hindered by plastic decomposition products. They are reversing this process, absorbing oxygen and converting it into carbon dioxide. This is indeed harmful to humans."
Tour pointed out that the fast Joule conversion eliminates many of the costs associated with plastic recycling, including the need to sort and clean energy and water. He said: "Instead of recycling plastic into pellets priced at US$2,000 per ton, it's better to upgrade it to higher-value graphene." "There are both economic and environmental incentives."
Despite a large amount of plastic raw materials, too much graphene will not be a problem. He said: "No matter how you handle carbon, once you absorb carbon from oil, natural gas or coal, the carbon will eventually enter the carbon dioxide cycle." "The advantage of graphene is that it is highly biodegradable under many conditions. . Slow, so in most cases, it will not re-enter the carbon cycle of hundreds of years."
He pointed out that researchers are working to improve the flash graphene process for other materials (especially food waste). He said: "We are trying to generate a good pulse sequence to convert food waste into high-quality graphene and minimize emissions." "We are using machine learning programs to help us know where to go."
This new research follows another recent paper that describes flash graphene produced from carbon black by direct current Joule heating. The paper (also used in ACS Nano) combines microscopy and simulation to show two different morphologies: turbine-layer graphene and wrinkled graphene sheets. This study describes how and why the rearranged carbon atoms will take one form or another, and the ratio can be controlled by adjusting the duration of the flash.

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