Citrate Stabilized Magnetic Nanoparticles (fe3 O4 ) For The Removal Of Pb 2 Ions In Wastewater

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Water contaminations by heavy metals are a major environmental problem due to theirrnacute toxicity and their accumulation in food chains. One of such toxic heavy metals isrnPbrn2+rn ions. In this study the synthesis of bare magnetite nanoparticles (B-MNPs), andrncitric acid coated magnetite nanoparticles (Cit-MNPs) to remove heavy metal Pbrn Page IVrn rn2+rn ionsrnfrom wastewater is reported. The Fern3rnOrn4 rnMNPs were synthesized using standard coprecipitationrnrnmethods. The as such prepared MNPs were characterized by AAS, XRD,rnFTIR, BET, and Zetasizer. Citric acid was used as surface coating and functionalizationrnof MNPs to increase the selectivity of the magnetic MNPs towards Pbrn2+ rnions. Using arnpermanent magnet, the Cit-MNPs were easily separated from the mixture after adsorptionrnof Pbrn2+ rnions. The adsorption of Pbrn2+ rnions from synthetic wastewater was tested using arnbatch experiment to assess the feasibility of the prepared MNPs. The main operationalrnparameters namely pH, adsorbent mass, initial Pbrn2+ rn ions concentration, and contact timernwere investigated to understand the optimal experimental conditions for removal of Pbrn2+rnrnions. The adsorption efficiency was highly pH-dependent. The maximum removalrnefficiencies of Pbrn2+ rnions on Cit-MNPs and B-MNPs were over 96.1% and 83.3%, usingrnadsorbent dose: 0.1 g/L , at pH: 5, contact time: 60 minutes, initial metal ionsrnconcentration: 50 mg/L, shaker speed: 200 rpm, and temperature: normal, respectively.rnThe sorption of Pbrn2+rn ions onto nanoadsorbents obeyed the Freundlich adsorptionrnisotherm model. The maximum adsorption capacity achieved by Cit-MNPs is about 200rnmg/g, which is higher than B-MNPs, i.e., 111.1 mg/g. A kinetic study confirms more thernpseudo-second-order model with Rrn2rn = 0.99. The first-order rate constant of Krn1 rnandrnsecond-order rate constant of Krn2rn were found to be, Krn1rn = 1.1x10rn-2rn minutern-1rn, Krn2rn = 1.3x10rn-2rnrnminutern-1rnfor B-MNPs and Krn1rn = 1.9x10rn-2rn minutern-1rn, Krn2rn = 1.4x10rn-2rn minutern-1 rnfor Cit-MNPs,rnrespectively. This result confirmed that the synthesized MNPs nanoadsorbents arernconsidered the most promising sorbent with high efficiency and more feasible to removernPbrn2+rn, a heavy metal ions from synthetic wastewater.

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Citrate Stabilized Magnetic Nanoparticles (fe3 O4 ) For The Removal Of Pb 2  Ions In Wastewater