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Influence of aging on the removal of poly(ethylene terephtalate) microplastics with ferrate (VI)
Summary
Researchers investigated how aging of poly(ethylene terephthalate) (PET) microplastics affects their removal efficiency using ferrate(VI) treatment. The study examined how physical and chemical changes induced by weathering alter the interaction between PET microplastics and ferrate(VI), with implications for optimizing microplastic removal in water treatment processes.
Plastiku karakterizira visoka kemijska i fizička stabilnost, trajnost i niski troškovi proizvodnje. Zbog tih karakteristika postala je široko korištena u industriji i svakodnevnom životu. Međutim, masovna proizvodnja plastike i loše gospodarenje otpadom rezultirali su njenom sveprisutnošću u okolišu što doprinosi ekološkom problemu mikroplastike. Mikroplastika u okolišu nastaje kroz kemijsku, fizičku i biološku degradaciju, a njezina glavna obilježja uključuju visoku kemijsku stabilnost, sposobnost daljnje fragmentacije u nanoplastiku, te sposobnost adsorpcije drugih onečišćujućih tvari. Zbog potencijala za bioakumulaciju također predstavlja ozbiljan rizik za ekosustave i ljudsko zdravlje. Jedan od glavnih izvora mikroplastike u okolišu su vodeni tokovi koji su prošli sustave pročišćavanja jer se mikroplastika teško uklanja standardnim metodama pročišćavanja. Međutim, istraživanja o učinkovitosti uklanjanja mikroplastike još su u ranoj fazi zbog nemogućnosti pronalaska preciznih metoda kvantifikacije mikroplastike u okolišnim uzorcima. Ferati(VI) poznati su po svojoj multifunkcionalnosti, osobito u pročišćavanju onečišćujućih tvari, gdje zahvaljujući snažnim oksidacijskim svojstvima učinkovito djeluju na širok spektar organskih i anorganskih onečišćujućih tvari, uključujući i mikroplastiku. Poli(etilen-tereftalat) (PET) jedan je od najrasprostranjenijih plastičnih materijala, te je zbog svoje dugovječnosti i otpornosti na razgradnju jedan od glavnih tipova polimera prisutnih u okolišu u obliku mikroplastike. U ovom radu ispitana je mogućnost uklanjanja termički starene i nestarene PET mikroplastike procesom koagulacije feratima(VI) iz vodene otopine u različitim uvjetima pH. Masa istaložene mikroplastike određena je mjerenjem sadržaja organskog ugljika u filtratima uzoraka. Ferati(VI) pokazali su se donekle primjenjivim za uklanjanje mikroplastike, međutim potrebno je ispitati učinkovitost uklanjanja pri istim koncentracijama ali manjim obrocima višekratno.
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