Ethylenediamine grafted to graphene oxide@Fe₃O₄ for chromium(VI) decontamination: Performance, modelling, and fractional factorial design - Fig 4

<p>(a) Time profiles of Cr(VI) adsorption with GO@Fe₃O₄ and EDA-GO@Fe₃O₄; Kinetics of Cr(VI) adsorption by fitting (b) pseudo-first-order and pseudo-second-order models, and (c) intraparticle diffusion model, respectively (initial Cr(VI) concentration = 10 mg/L; sorbent dose = 2 mL; temperature = 25°C; pH = 2).</p

Adsorption kinetics parameters for Cr(VI) adsorption onto GO@Fe₃O₄ and EDA-GO@Fe₃O₄.

<p>Adsorption kinetics parameters for Cr(VI) adsorption onto GO@Fe₃O₄ and EDA-GO@Fe₃O₄.</p

HRTEM images of EDA-GO@Fe₃O₄ at different magnification.

<p>HRTEM images of EDA-GO@Fe₃O₄ at different magnification.</p

Effect of solution pH on Cr(VI) adsorption onto the EDA-GO@Fe₃O₄: (initial Cr(VI) concentration = 10 mg/L; sorbent dose = 2 mL; temperature = 25°C; time = 8 h).

<p>Effect of solution pH on Cr(VI) adsorption onto the EDA-GO@Fe₃O₄: (initial Cr(VI) concentration = 10 mg/L; sorbent dose = 2 mL; temperature = 25°C; time = 8 h).</p

Isotherm parameters for Cr(VI) ions adsorption onto EDA-GO@Fe₃O₄.

<p>Isotherm parameters for Cr(VI) ions adsorption onto EDA-GO@Fe₃O₄.</p

Le Courrier

15 juillet 18341834/07/15 (N196)