Removal of Aqueous Cr(VI) using Magnetite Nanoparticles Synthesized from a Low Grade Iron Ore
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We demonstrated the efficacy of magnetic nanoparticles (MNPs) produced from a low grade iron ore as anadsorbent for the removal of Cr(VI), a toxic heavy metal anion present in wastewater. The adsorption of Cr(VI) bythese MNPs strongly depended on the dosage of MNPs, the initial concentration of the Cr(VI) solutions, and pH. Thehighest Cr(VI) adsorption efficiency of 22.0 mg/g was observed at pH 2.5. The adsorption data were best fit with theLangmuir isotherm and corresponded to a pseudo‐second‐order kinetic model. The used adsorbent was regenerated byeluting in highly alkaline solutions. Sodium bicarbonate showed the highest desorption efficiency of 83.1% amongvarious eluents including NaOH, Na2HPO4, and Na2CO3. Due to the high adsorption capacity, the simple magneticseparation, and the high desorption efficiency, this nano‐adsorbent produced from inexpensive and abundant resourcesmay attract the attention of the industries to apply for removing various metal anionic contaminants from wastewater.
Abstract
We demonstrated the efficacy of magnetic nanoparticles (MNPs) produced from a low grade iron ore as anadsorbent for the removal of Cr(VI), a toxic heavy metal anion present in wastewater. The adsorption of Cr(VI) bythese MNPs strongly depended on the dosage of MNPs, the initial concentration of the Cr(VI) solutions, and pH. Thehighest Cr(VI) adsorption efficiency of 22.0 mg/g was observed at pH 2.5. The adsorption data were best fit with theLangmuir isotherm and corresponded to a pseudo‐second‐order kinetic model. The used adsorbent was regenerated byeluting in highly alkaline solutions. Sodium bicarbonate showed the highest desorption efficiency of 83.1% amongvarious eluents including NaOH, Na2HPO4, and Na2CO3. Due to the high adsorption capacity, the simple magneticseparation, and the high desorption efficiency, this nano‐adsorbent produced from inexpensive and abundant resourcesmay attract the attention of the industries to apply for removing various metal anionic contaminants from wastewater.
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