Research

Researchers create new composite from waste coffee grounds

Coffee is one of the most popular drinks in the world and is drunk by a large number of us daily, this generates a lot of waste material, in particular, those spent coffee grounds that went into making your cup of Joe.

Researchers from Washington State University have come up with a way of using these materials by creating a new plastic composite material made partly from waste coffee grounds.

It’s hoped that the work could lead to new applications for 3D printing as well as make better use of waste materials. Reporting in the journal, ACS Sustainable Chemistry and Engineering, the researchers found that their material, made from up to 20% coffee waste, had a more than 400% increase in toughness over pure poly‑lactic acid (PLA), the type of plastic that is most commonly used in 3D printing.

PLA is a plastic material used for many medical and consumer products, such as in drug delivery, tissue engineering, food packaging, as well as for 3D printing. Made from corn starch, it is biodegradable. But, when used for 3D printing applications, products made from PLA lack strength and break easily. Products that are 3D printed, in fact, are almost entirely limited to being toys, trinkets, or display models.

Researchers have been looking to add low‑cost additives, such as wood fibre, silica, or clay, to enhance the material’s performance as well as to reduce manufacturing costs. Such additives from renewable sources could also keep waste materials from ending up in a landfill and creating additional pollution.

For their study, the WSU researchers decided to add coffee ground waste to the PLA. People around the world drink more than two billion cups of coffee every day, so waste coffee grounds are abundantly available.

We have a virtually limitless supply of coffee grounds. Our goal is to extend the life cycle for these waste products. We looked at what is overproduced and tried to make something useful out of it. Yu‑Chung Chang – Washington State University Graduate Student

The researchers didn’t use actual coffee grounds. Rather, they used a dry and odourless material that is left over after the coffee oil had been removed and used for biodiesel production. After mixing their coffee material with the PLA, they printed out and tested their specimens.

The research showed that the oil‑extracted spent coffee grounds can not only increase the impact toughness, but they also reduce the cost of overall 3D printing materials. They are hoping to continue the work and conduct further study on how the material will degrade in the environment.

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