Rapid adsorption of heavy metals by Fe3O4/talc nanocomposite and optimization study using response surface methodology.

Katayoon Kalantari,Mahiran Basri,Kamyar Shameli,Roshanak Khandanlou,Hamid Masoumi,Mansor Ahmad

doi:10.3390/ijms150712913

Katayoon Kalantari, Mahiran Basri + Show 4 more

Open Access

https://doi.org/10.3390/ijms150712913

Copy DOI

Abstract

Fe3O4/talc nanocomposite was used for removal of Cu(II), Ni(II), and Pb(II) ions from aqueous solutions. Experiments were designed by response surface methodology (RSM) and a quadratic model was used to predict the variables. The adsorption parameters such as adsorbent dosage, removal time, and initial ion concentration were used as the independent variables and their effects on heavy metal ion removal were investigated. Analysis of variance was incorporated to judge the adequacy of the models. Optimal conditions with initial heavy metal ion concentration of 100, 92 and 270 mg/L, 120 s of removal time and 0.12 g of adsorbent amount resulted in 72.15%, 50.23%, and 91.35% removal efficiency for Cu(II), Ni(II), and Pb(II), respectively. The predictions of the model were in good agreement with experimental results and the Fe3O4/talc nanocomposite was successfully used to remove heavy metals from aqueous solutions.

Highlights

The release of heavy metals in aqueous systems is of severe concern due to their hazardous effects on human and the environment
Fe3O4/talc nanocomposite was used for removal of Cu(II), Ni(II) and Pb(II) ions from aqueous solutions and response surface methodology (RSM) was applied for optimization study and screening variables effects on ion removal
The objective of this study was to examine the ability of Fe3O4/talc nanocomposite to remove heavy metal ions from aqueous solution according to response surface methodology design

Summary

Introduction

The release of heavy metals in aqueous systems is of severe concern due to their hazardous effects on human and the environment. Several conventional techniques have been reported to remove metal ions from aqueous solutions, such as oxidation, reduction, precipitation, membrane filtration, ion exchange, and adsorption. Among these methods, adsorption is the most favorable process, economically and technically, for removing heavy metals from aqueous solutions [2,3]. Fe3O4 nanoparticles were shown to be highly efficient materials for heavy metal ion removal by adsorption; metal ion adsorption by magnetite was demonstrated through a combination of electrostatic attraction and ligand exchange [4,5,6]. Several techniques have been developed to minimize the co-aggregation of the Fe3O4 nanoparticles and improve their manipulation, for example using polymers and clays [9]. Clay soils are widely used as adsorbents that isolate hazardous and other waste materials from surrounding environments

Objectives

Methods

Results

Conclusion