Figures & data
Figure 1 Comparative Fourier transform infrared spectra of bare-SPIONs. (A–a) Pure PGA (A–a′) and PGA-SPIONs (A–b), as well as thermogravimetric curves of bare-SPIONs (B–a) and PGA-SPIONs (B–b).
Abbreviations: SPIONs, superparamagnetic iron oxide nanoparticles; PGA, poly(γ-glutamic acid); PGA-SPIONs, poly(γ-glutamic acid)-superparamagnetic iron oxide nanoparticles.
Figure 2 X-ray diffraction pattern (A) and transmission electron microscopic images (B) of bare-SPIONs (a) and PGA-SPIONs (b).
Abbreviations: SPIONs, superparamagnetic iron oxide nanoparticles; PGA-SPIONs, poly(γ-glutamic acid)-superparamagnetic iron oxide nanoparticles.
Figure 3 Magnetization curves showing magnetic moments as a function of applied magnetic field (A), and linear plots depicting the variation in magnetic moments as affected by reciprocal of applied magnetic field (B). (a) Bare-SPIONs; (b) PGA-SPIONs.
Abbreviations: SPIONs, superparamagnetic iron oxide nanoparticles; PGA-SPIONs, poly(γ-glutamic acid)-superparamagnetic iron oxide nanoparticles.
Figure 4 Zeta potential analyses of bare-SPIONs (a) and PGA-SPIONs (b) at different solution pH.
Abbreviations: SPIONs, superparamagnetic iron oxide nanoparticles; PGA-SPIONs, poly(γ-glutamic acid)-superparamagnetic iron oxide nanoparticles.
Figure 5 Effect of solution pH on lead and cadmium removal by PGA-SPIONs.
Abbreviation: PGA-SPIONs, poly(γ-glutamic acid)-superparamagnetic iron oxide nanoparticles.
Figure 6 Removal kinetics (A) and removal isotherms (B) for lead and cadmium removal by PGA-SPIONs.
Abbreviation: PGA-SPIONs, poly(γ-glutamic acid)-superparamagnetic iron oxide nanoparticles.
Figure 7 Effect of different ionic strengths at varying sodium acetate solution (0.001 M to 1 M) on lead and cadmium removal by PGA-SPIONs.
Abbreviation: PGA-SPIONs, poly(γ-glutamic acid)-superparamagnetic iron oxide nanoparticles.
Figure 8 Effect of different essential metals on lead removal (A) and cadmium removal (B) by PGA-SPIONs.
Abbreviation: PGA-SPIONs, poly(γ-glutamic acid)-superparamagnetic iron oxide nanoparticles.
Figure 9 Solution pH variation (A) and isotherm (B) studies for removal of lead and cadmium by PGA-SPIONs from simulated gastrointestinal fluid.
Abbreviation: PGA-SPIONs, poly(γ-glutamic acid)-superparamagnetic iron oxide nanoparticles.
