Rapid and high capacity adsorption of heavy metals by Fe3O4/montmorillonite nanocomposite using response surface methodology: Preparation, characterization, optimization, equilibrium isotherms, and adsorption kinetics study

Abstract

a b s t r a c tFe 3 O 4 /montmorillonite nanocomposite (Fe 3 O 4 /MMT NC) was synthesized for removal of Pb 2+ , Cu 2+ and Ni 2+ ions from aqueous systems. The nanoadsorbent was characterized by X-ray diffraction and transmission electron microscopy and mean diameter of magnetic nanoparticles was about 8.24 nm. The experiments were designed by response surface methodology and quadratic model was used to prediction of the variables. The adsorption parameters of adsorbent dosage, removal time, and initial heavy metal ions concentration were used as the independent variables and their effects were investigated on the heavy metal ions removal. Variance analysis was utilized to judge the adequacy of the chosen models. Optimum conditions with initial heavy metal ions concentration of 510.16, 182.94, and 111.90 mg/L, 120 s of removal time and 0.06 g/0.025 L, 0.08 g/0.025 L, and 0.08 g/0.025 L of adsorbent amount were given 89.72%, 94.89%, and 76.15% of removal efficiency Pb 2+ , Cu 2+ and Ni 2+ ions, respectively. Prediction of models was in good agreement with experimental results and Fe 3 O 4 /MMT NC was found successful in removing heavy metals from their aqueous solutions.

Novel Fe3O4/hydroxyapatite/β‐cyclodextrin nanocomposite adsorbent: Synthesis and application in heavy metal removal from aqueous solution

“…There are many types of research on heavy metal removal with different Fe 3 O 4 ‐based nanocomposites, but to the best of our knowledge, no work on hydroxyapatite (HA) and β‐cyclodextrin (β‐CD) modified Fe 3 O 4 has been published in the literature. HA is an inorganic material which constitutes a main part of bones and teeth.…”

Synthesis and characterization of magnetic-montmorillonite and magnetic-organo-montmorillonite: Surface sites involved on cobalt sorption

“…Combination of magnetic nanoparticles with clays has been applied even in enzymatic immobilization [17], as bactericide materials [18], T in catalytic activity [19,20], environmental remediation and biocompatible materials [21][22][23][24].…”

Mutual Adsorption of Lead and Phosphorus onto Selected Soil Clay Minerals

“…The interaction between toxic metals and clay mineral colloids is important in surface chemistry, soil science, and pollution studies [7] [8] [9]. For example, the interaction between phosphate and soil minerals affects the surface activity of the colloid and mobility of P in the soil.…”