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Removal of microplastic particles using ferrate (VI) from water
Summary
This Croatian study tested ferrate (VI), a multi-functional water treatment reagent, for removing PET microplastics from water using coagulation. Results showed partial removal effectiveness, with the authors noting further work is needed across a wider pH range and to quantify any nanoplastic fraction released during treatment.
Plastika se najčešće odlikuje visokom stabilnosti, trajnosti i niskom cijenom proizvodnje. Postala je sveprisutna u okolišu kao posljedica masovne proizvodnje i lošeg gospodarenja otpadom. Mikroplastika nastaje kroz fizičku, kemijsku i biološku degradaciju većih komada plastike u okolišu. Mikroplastiku karakterizira velika kemijska stabilnost u okolišu, mogućnost daljnje fragmentacije u nanoplastiku i sposobnost adsorpcije drugih onečišćivala, kao i potencijal za bioakumulaciju. Otpadne vode sadrže mikroplastiku i nepoznate količine nanoplastike koje ne mogu biti u potpunosti uklonjene. Studije efikasnosti uklanjanja mikroplastike u početnoj su fazi zbog nedostatka standardnih protokola kvantifikacije mikroplastike u okolišnim matricama. Ferat je već dugo poznat kao svestran i multifunkcionalni reagens u obradi voda s mogućnošću pročišćavanja različitih vrsta zagađivača, ali nedostaci poput niske stabilnosti ograničavaju njegovu široku primjenu. U ovom radu provedeno je modelno starenje mikroplastike, te je ispitana mogućnost uklanjanja PET mikroplastike procesom koagulacije feratima iz vodene otopine u blago kiselom pH. Uzorci su karakterizirani FTIR spektrofotometrom, a masa istaložene mikroplastike određena je mjerenjem sadržaja organskog ugljika u filtratima uzoraka. Ferat se pokazao donekle primjenjivim za uklanjanje mikroplastike, međutim potrebno je ispitati učinkovitost uklanjanja u širem rasponu pH te kvantificirati udio nanoplastike.
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