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Preparation and use of alginate-based composites with the addition of graphene oxide for the removal of divalent metal ions from aqueous solutions

Fryczkowska Beata, Zaręba Piotr

Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej

2024

Nr 92 (tom 1)

85--101

Industrial wastewater contains heavy metals such as zinc, copper, lead, chromium, nickel, cadmium, arsenic, cobalt and mercury and is one of the types of sewage that negatively affect the environment. Metal ions can be removed using various types of sorbents. An interesting solution are polysaccharide-based sorbents. This paper presents research on the preparation and use of granules based on 2% alginate with the addition of 2.81% graphene oxide as sorbents of the following ions: Ni2+, Co2+, Cu2+, Pb2+ and Cd2+. Graphene oxide / alginate solutions, containing from 0.18% to 5.62% of GO, were prepared for the tests. Granules were formed by coagulating successive alginate solutions in 2.5% CaCl2 (Method 1). The possibility of introducing alginate solutions directly into solutions containing metal ions was also tested (Method 2). As a result of the study, it was observed that the use of ready-made sorbent (Method 1) allows the removal of ~ 30% of the contamination within 30 to 60 minutes. This method turned out to be the most effective for removing Ni2+, Co2+ and Cu2+ ions. The use of a simplified procedure (Method 2), on the other hand, allows the removal of all tested metal ions in amounts ranging from 5% (Cd2+) to 25% (Co2+).