Published: 12th Jan, 2023
Context
A team of researchers has analysed how light breaks down polystyrene, a non-biodegradable plastic from which packing peanuts, DVD cases and disposable utensils are made.
Findings
- When exposed to light, the nanoplastics derived from polystyrene unexpectedly facilitated the oxidation of aqueous manganese ions.
- The formation of manganese oxide solids that can affect the fate and transport of organic contaminants in natural and engineering water systems.
- It showed how the photochemical reaction of nanoplastics through light absorption generates peroxyl and superoxide radicals on nanoplastic surfaces, and initiates oxidation of manganese into manganese oxide solids.
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Nanoplastics are particles unintentionally produced (i.e. from the degradation and the manufacturing of the plastic objects), within the size range from 1 to 1000 nm. |
Concern associated:
- There are concerns over the physical presence of nano-plastics rather than their active roles as reactants.
- The small plastic particles that can more easily interact with neighbouring substances, such as heavy metals and organic contaminants, and can be more reactive.
- The smaller particle size of the polystyrene Nano-plastics may more easily decompose and release organic matter because of their larger surface area.
- This dissolved organic matter may quickly produce reactive oxygen species in light and facilitate manganese oxidation.
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