قالب وردپرس درنا توس
Home / Science / Strategies for flashing graphene to petrify waste plastics

Strategies for flashing graphene to petrify waste plastics



Strategies for flashing graphene to petrify waste plastics

The flash graphene made of plastic in Rice University’s laboratory started with post-consumer plastic received from recyclers. It is then mixed with carbon black and processed into turbine-layer graphene through AC and DC timing pulses.Credit: Tour Group/Rice University

Thanks to ACDC, the plastic waste returns to black in the form of pure graphene.


Scientists at Rice University call it a process of effective use of waste plastic, otherwise it will increase the earth’s environmental dilemma. In this case, Rice chemist James Tour̵

7;s laboratory modified its method of manufacturing flash graphene to enhance its ability to recycle plastic into graphene.

The laboratory’s research was published in the Journal of the American Chemical Society ACS Nano.

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 subjected to direct current oscillation.

The product is high-quality turbine layer graphene, a valuable soluble substance that can be used to enhance electronic products, composite materials, concrete and other materials, and carbon oligomers. These molecules can be expelled from graphene for Other uses.

Rice graduate student and lead author Wala Algozeeb (Wala Algozeeb) said: “We produce a lot of hydrogen during the flash evaporation process, which is a clean fuel.”

Tour estimates that on an industrial scale, the ACDC process can produce graphene for electricity costs of approximately $125 per ton of plastic waste.

Strategies for flashing graphene to petrify waste plastics

The transmission electron microscope image shows ACDC flash graphene produced by Rice University. This process is expected to produce high-quality turbine layer graphene from waste plastics, which can be used to enhance electronics, composites, concrete and other materials.Credit: Tour Group/Rice University

“We proved in the original paper that plastic can be converted, but the quality of graphene is not as good as we wanted,” Tour said. “Now, by using different electrical pulse sequences, we can see a big difference.”

He pointed out that most plastic recycling technologies in the world are ineffective, and only about 9% of produced plastics are recycled. Thor said the most notorious is a plastic waste island formed in the Pacific Ocean, the size of which is about the size of Texas.

He said: “We have to deal with this problem.” “There is another problem: the microorganisms in the ocean that convert carbon dioxide to oxygen are hindered by plastic decomposition products. They are reversing this process, absorbing oxygen and converting it to carbon dioxide. This is indeed harmful to humans.”

Tour noted that the fast Joule conversion eliminates many of the costs associated with recycling plastic, including the need for energy and water to sort and clean. He said: “Instead of recycling plastic into pellets priced at $2,000 per ton, it is better to upgrade it to graphene with higher value.” “There are both economic incentives and environmental incentives.”

Tour said that despite the huge amount of plastic raw materials, too much graphene content will not be a problem. He said: “No matter what you do with carbon, once it is absorbed from oil, natural gas or coal underground, the carbon will eventually enter the carbon dioxide cycle.” “The good thing about graphene is that it is very 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 in ACS Nano) combines microscopy and simulation to show two different morphologies: turbine-layer graphene and wrinkled graphene sheets. The study describes how and why the rearranged carbon atoms will take one form or another, and the ratio can be controlled by adjusting the flash duration.


The laboratory instantly turns garbage into valuable graphene


More information:
Wala A. Algozeeb et al., “Flash Graphene in Plastic Waste”, ACS Nano (2020). DOI: 10.1021 / acsnano.0c06328

Provided by Rice University

Citation: On October 30, 2020 from https://phys.org/news/2020-10-graphene-strategy-plastic.html to retrieve plastic waste rapid graphene rock strategy (October 30, 2020)

This document is protected by copyright. Except for any fair transactions for private learning or research purposes, no content may be copied without written permission. The content is for reference only.




Source link