NiFe2O4 coated sand as a nano-adsorbent for removal of Pb (II) from aqueous solutions

Abstract

In this study, NiFe2O4 magnetic nanoparticles as an adsorbent for lead (Pb) removal were coated on sand particles. Adsorption studies were conducted to investigate the efficacy of contact time, pH, adsorbent dosage and initial lead ion concentration on the removal efficiency. To choose the most fitting kinetic model, the pseudo-first order and pseudo-second order models were compared and the most suitable kinetic model was selected by the pseudo-second order. Langmuir and Freundlich isotherms were evaluated and the most suitable isotherm was observed as the Freundlich model. In addition, the NiFe2O4 coated sand can simply be removed by an ordinary filtration process.

Equilibrium, Thermodynamic, and Density Functional Theory Modeling Studies for the Removal of Dichromate Ions from Wastewater Using Calix[4]arene Modified Silica Resin

“…Wastewater might be contaminated by different toxicants such as inorganic ions, organic dyes, and pesticides that may produce several diseases in humans. − Among different inorganic ions, chromium is one of the highly toxic metal ions and known as a major water pollutant due to its uses in the electroplating process, metal finishing, leather tanning, and chromate synthesis. − Chromium exists in two forms in water Cr­(VI) and Cr­(III). Cr­(VI) is present in acidic media while Cr­(III) in basic media. , Cr­(VI) is highly soluble in water, and its oxidation potential shows hazardous properties .…”