| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 606400 | Journal of Colloid and Interface Science | 2016 | 13 Pages |
•Fe3O4 was synthesized by coprecipitation using TMAOH and thoroughly characterized.•Magnetite nanoparticles successfully remediated aqueous Cr6+ and Pb2+.•Magnetite Langmuir adsorption capacities of ∼35 (Cr6+) and ∼53 (Pb2+) mg/g were obtained.•Likely Cr6+ and Pb2+ sorption mechanisms versus pH were described.•Kinetics were pseudo-second order, rate dependent on the number of surface sites.
Magnetic magnetite (Fe3O4) nanoparticles synthesized by chemical co-precipitation were characterized using XRD, TEM, SEM-EDX, FT-IR, ED-XRF, PPMS, point of zero charge (pHpzc) and surface area measurements. As-prepared Fe3O4 nanoparticles were successful for aqueous Cr6+ and Pb2+ removal. Batch adsorption experiments systematically investigated the influence of pH, temperature, contact time and adsorbate/adsorbent concentration on Cr6+ and Pb2+ adsorption. Maximum Cr6+ and Pb2+ removal occurred at pH 2.0 and 5.0, respectively. Sorption data fit pseudo-second order kinetics, indicating a chemical adsorption. The Freundlich, Langmuir, Redlich–Peterson, Toth, Radke and Sips adsorption isotherm models were applied to describe equilibrium data. The Sips and Langmuir models best described Cr6+ and Pb2+ adsorption on magnetite nanoparticles, respectively. The maximum Langmuir adsorption capacities were 34.87 (Cr6+) and 53.11 (Pb2+) mg/g at 45 °C, respectively. Fe3O4 nanoparticles are promising potential adsorbents and exhibited remarkable reusability for metal ions removal in water and wastewater treatment.
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