Abstract
Arsenic, lead, cadmium and chromium are highly harmful and carcinogenic metals extracted from natural processes and anthropogenic practices such as the iron, electroplating and leather industries. Therefore, in order to prevent toxic contamination and to recover these heavy metals in the sense of a future circular economy, arsenic, lead, cadmium and chromium should be extracted from water. Aqueous arsenic, lead, cadmium and chromium species, their toxicity and techniques for extracting them, such as dispersive solid phase extraction (DSPE) and extraction of solid phases, are briefly reviewed here. In this research, the removal of As, Cr, Cd, and Pb using Fe3O4@Al2O3 and Fe3O4@MnO2 nanoparticles (NPs) as a sorbent was aided by dispersive solid phase extraction (DSPE). In order to define the NPs, classification techniques such as XRD, SEM, EDX and surface area (BET) were used. The experimental parameters influencing the removal process were optimised using fractional factorial architecture. Interest analytes were extracted and ICP-OES was then used for quantification. Under the optimal conditions, the LOD and LOQ (n = 20) were reasonably poor for As, Cr, Cd and Pb...
M.Sc. (Chemistry)