Have a problem with recycling. Thus, in general and even in countries that the more they try and complicate things. But, specifically, we have a problem with plastic recycling. It is a difficult and therefore expensive process, rather than producing new plastic, which leads to a scenario in which potential waste accumulates. To complicate things further, there are many types of plasticsand some are terribly difficult to recycle. But the University of Cambridge has had an idea: a solar reactor to destroy those difficult plastics.
And the secret ingredient is car battery acid.
The data. Before entering the ‘invention‘ from Cambridge, let’s go with some context. Recycling is not collecting, and vice versa. An example of this is Japan, a country in which there are areas in which there are 45 different categories of garbage that citizens must separate and where only 20% is recycled. In Spain, with an infinitely less obsessive systemwe are around 39%.
And what is not recycled is burned in Japan and sent to landfills in Spain. Focusing on plastic and according to Cambridge researchers, the world produces 400 million tons per year and only 18% is recycled. And, as I say, there are plastics such as nylon or polyurethane that are particularly complex to recycle because their chemical structure is very resistant, which makes breaking them down complex and very expensive.
plastic fulminator. This is where the discovery of the University of Cambridge comes into play. What they have developed is a solar-powered reactor that uses a very special ingredient: car battery acid. This component breaks the structural chains of the polymers into more basic chemical blocks and, therefore, easier to assimilate, such as ethylene glycol.
Once the new material is obtained, a very special photocatalyst is what allows it to be converted into hydrogen and acetic acid, putting an end to that ‘rebellious’ plastic.
By fluke. The team of researchers comments that the discovery was practically an accident since they knew that battery acid could be used for the process, but it was not convenient because, just as it melts plastics, it ‘eats’ the catalysts. Theirs, however, held out, and it turns out to be cheap and scalable.
It is a photocatalyst composed of carbon nitride functionalized with cyanamide and integrated with molybdenum disulfide promoted with cobalt. Lots of text to say that it is a hybrid material specifically designed to remain stable in a strongly acidic environment. According to the team, it is economical and solves two problems at once: it dissolves difficult plastics and reuses battery acid that usually ends up as waste after extracting its lead content for resale.
Future. In the tests, the team points out that the system has worked for more than 260 hours without losing performance and works with the aforementioned plastics, but also with that of the plastic bottles They are also not particularly easy to deal with. They claim that their discovery offers a potential cost reduction in recycling tasks because, in addition, reusable hydrogen is produced in the process.
The key here is finding a way to collect the battery acid before it is neutralized for uninterrupted use to break down plastics. The team comments that they do not promise to solve the problem, but they demonstrate how waste can become a resource.
new life. This approach approaches the problem from the angle of decomposition, but there are other proposals to give these plastics a second life. Because ‘melting’ them may be expensive, but if they are put into presses they can be turned directly into bricks or paving stones for the streets. This is what Nzambi Matee proposes, a Kenyan materials engineer who has proposed convert that waste into construction material.
Like the University of Cambridge experiment, it addresses two problems at the same time: recycling and creating necessary non-polluting construction elements, and this idea is catching on because the authorities have given the green light to use this 2.0 brick to pave the streets of Nairobi.
Returning to battery acid, the business arm of the University of Cambridge is looking to commercialize the company, but now the most complicated thing remains: making it a standard.
Images | Cambridge University (Beverly Low)
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