Fig 1 -

SEM images of (a) Oyster Shell carbon material (b and c) Acid treated oyster shell biocomposite; EDS Images (aˈ-eˈ)Oyster shell biocomposite.</p

Fig 7 -

Plot of (a and b) predicted and actual value of normal distribution and residual value.</p

Raman spectra of oyster shell biocomposite before and after Cd and Pb adsorption.

Raman spectra of oyster shell biocomposite before and after Cd and Pb adsorption.</p

Fig 9 -

Pseudo-first-order kinetics model for the adsorption (a) Cd(II); (b) Pb(II) ions; Pseudo-second-order kinetics model for the adsorption (c) Cd(II) (d) Pb(II) ions; Elovich model for the adsorption (e) Cd(II) (f) Pb(II) ions, (g) intraparticle diffusion model for the adsorption of Cd(II) (h) Pb(II) ions on oyster shell biocomposite.</p

TEM of oyster shell biocomposite before and after adsorption of Cd and Pb.

TEM of oyster shell biocomposite before and after adsorption of Cd and Pb.</p

Independent variables and experimental data for the adsorption of Cd and Pb on oystershell biocomposite.

Independent variables and experimental data for the adsorption of Cd and Pb on oystershell biocomposite.</p

Oyster shell based adsorbent and removal efficiency for heavy metal removal.

Oyster shell based adsorbent and removal efficiency for heavy metal removal.</p

ANOVA of response second order quadratic model for percentage removal of Pb(II) ions on oyster shell biocomposite.

ANOVA of response second order quadratic model for percentage removal of Pb(II) ions on oyster shell biocomposite.</p

ANOVA of response second order quadratic model for percentage removal of Cd(II) ions on oyster shell biocomposite.

ANOVA of response second order quadratic model for percentage removal of Cd(II) ions on oyster shell biocomposite.</p

Point zero charge study of oyster shell biocomposite adsorbent.

Point zero charge study of oyster shell biocomposite adsorbent.</p