Background: Modified bio-based adsorbents from plant sources can be used for
pollution remediation by adsorption due to their low cost and availability in large quantities.
Objective: In this study, the competitive biosorption of Pb(II) and Cu(II) by Micropogonias
undulates functionalised fish scales (FFS) was conducted. The functionalisation was done by
wet impregnation with Fe2+.
Methods: The biosorbent was characterised by Fourier Transform Infrared Spectroscopy
(FT-IR), Scanning Electron Microscopy with Energy-Dispersive X-ray Spectroscopy (SEMEDS)
and Branueur-Emmett-Teller (BET) analyses.
Results: The major constituents in the FFS were calcium and phosphorus from the collagen
and apatite on the scales. Optimum removal efficiency for both metals was >99% at 10 g/l
dosage. It was observed that the Langmuir isotherm model and the pseudo second order kinetics
model were the best fit for the experimental data. The monolayer adsorption capacity
of FFS for Pb(II) and Cu(II) was observed to be 96.15 mg/g and 100 mg/g, respectively.
Conclusion: The study revealed that the competitive biosorption of heavy metals can be
achieved (at a good adsorption capacity) using functionalised Micropogonias undulates fish
Keywords: Biosorption, Competitive adsorption, Croacker, Fish scales, Water pollution, PhACs.
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