الفهرس 
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Abstract
Rice hulls (RH), a harmful biowaste, was used to produce nanosized activated carbon (RHAC) by combustion and phosphoric acid treatment. The developed RHAC was characterized using various structural and morphological techniques (SEM, XRD, FTIR, and N2 adsorption). The prepared RHAC was used to remove heavy metal ions (Fe(III) and Cr(VI)) by the adsorption mechanism. Adsorption parameters, e.g., contact time, the dose, initial concentration of the heavy metals ions, were investigated. Five adsorption models (2 & 3 parameters) were studied. Also, the adsorption kinetic through the intraparticle diffusion model was applied. RHAC shows adsorption capacities of 47.00 and 45.00 mg/g for Fe(III) and Cr(VI), respectively. The findings recommend using RHAC as low-cost and eco-friendly for metal ions removal and water treatment applications.
Highlights:
• Porous activated carbon was successfully obtained from rice hulls
• The prepared material was used as an adsorbent for Fe(III) and Cr(VI) removal
• This low-cost and eco-friendly adsorbent is a promising candidate for water treatment applications
Keywords: Nanoactivated carbon; Rice hulls; Wastewater; Heavy metal; Adsorption isotherm; Kinetic.