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Abstract
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A highly efficient eco-friendly nanoadsorbent i.e. γ-Fe2O3/MWCNTs/Cellulose was derived from waste tires and natural
cellulose for malachite green removal from aqueous solutions through a chemical vapor deposition technique. The properties
of the synthesized nanoadsorbent were identified using XRD, FESEM, EDX, TEM, EDS, DLS, FTIR, VSM, BET, XPS,
and TGA. According to the results, the highest malachite green adsorption capacity was obtained by γ-Fe2O3/MWCNTs/
cellulose 47.61 mg/g. In addition, the amount of dye adsorption increased with decreasing flow rate and enhancing column
length from 9 to 3 mL/min and 2 to 10 min, respectively. The pseudo-second-order and the Langmuir model were the best
kinetic and isothermal models to describe the malachite green adsorption process (R2 > 99%). The thermodynamic results
demonstrated that the adsorption process is exothermic and spontaneous. However, after 4 consecutive adsorption/desorption
cycles, the removal efficiency was 87.35%. Therefore, γ-Fe2O3/MWCNTs/Cellulose can be considered as an outstanding
adsorbent for malachite green removal.
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