UV-vis spectra of Orange I solution before and after adsorption.

<p>UV-vis spectra of Orange I solution before and after adsorption.</p

Schematic illustration for adsorption of Orange I by Fe₃O₄-CS.

<p>Schematic illustration for adsorption of Orange I by Fe₃O₄-CS.</p

Effect of contact time on Orange I adsorption by Fe₃O₄-CS.

<p>Effect of contact time on Orange I adsorption by Fe₃O₄-CS.</p

Effect of pH on Orange I adsorption by Fe₃O₄-CS.

<p>Effect of pH on Orange I adsorption by Fe₃O₄-CS.</p

XRD patterns of Fe₃O₄-CS.

<p>XRD patterns of Fe₃O₄-CS.</p

Langmuir and Freundlich parameters for adsorption of Orange I by Fe₃O₄-CS.

<p>Langmuir and Freundlich parameters for adsorption of Orange I by Fe₃O₄-CS.</p

TGA curve of Fe₃O₄-CS.

<p>TGA curve of Fe₃O₄-CS.</p

Effect of initial concentration on Orange I decoloration by Fe₃O₄-CS.

<p>Effect of initial concentration on Orange I decoloration by Fe₃O₄-CS.</p

Plots of Langmuir (a) and Freundlich (b) isotherms.

<p>Plots of Langmuir (a) and Freundlich (b) isotherms.</p

SEM images (a, b, c) and TEM image (d) of Fe₃O₄ and Fe₃O₄-CS.

<p>SEM images (a, b, c) and TEM image (d) of Fe₃O₄ and Fe₃O₄-CS.</p