American scientists find better way to recycle plastic bottles

Published: February 28, 2019 14:09:03 | Updated: March 02, 2019 18:16:10

A woman depositing a plastic bottle in a recycling bin in Worcestershire, UK. Photo: Collected

American scientists have developed a more effective and greener way to recycle the single-use plastics made from a common polyester material, which could help protect oceans from plastic waste by jumpstarting the recycled plastics market.

The researchers from the US National Renewable Energy Laboratory (NREL) combined reclaimed polyethylene terephthalate (PET) with molecules derived from waste plant biomass to produce two types of fibre-reinforced plastics, which are two to three times more valuable than the original PET, according to the study published on Wednesday in the journal Joule.

PET is strong, light-weight and water-resistant material widely used in beverage bottles, clothing and carpet. It is recyclable, but tends to have a lower value than the original and can only be reproduced once or twice.

"Standard PET recycling today is essentially 'downcycling,'" said the paper's senior author Gregg Beckham with NREL.

The new process 'upcycles' PET into long-lifetime, high-value composite materials that would be used in car parts, wind turbine blades or surfboards, said Beckham.

Although still in a lab stage, the researchers predicted that the composite product would require 57 per cent less energy than the current recycling process and would emit 40 per cent fewer greenhouse gases than standard fibre-reinforced plastics production, according to Xinhua.

But the researchers still have to test the process for scalability to determine how well it might fare in a manufacturing setting, according to the study.

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