Response surface methodology for the optimization of lanthanum removal from an aqueous solution using a Fe3O4/chitosan nanocomposite

Yuvaraj Haldorai, Arunkumar Rengaraj, Taegong Ryu, Junho Shin, Yun Suk Huh, Young Kyu Han

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

In the present work, magnetite nanoparticles/chitosan composites (Fe3O4/CS) were prepared by a chemical precipitation method. We demonstrated the efficient removal of a rare earth metal, lanthanum (La3+), from an aqueous solution using the composite. The removal of La3+ was optimized by using response surface methodology. Analysis of variance and Fisher's F-test were used to determine the reaction parameters which affect the removal of La3+. Optimal conditions, including adsorbent dosage, pH, temperature, and contact time for the removal of La3+, were found to be 6.5 mg, pH 11, 40 °C, and 50 min, respectively. The adsorption capacity was 99.88%. The rate of La3+ adsorption was significantly affected by the solution pH and adsorbent amount. An adsorption isotherm was fitted well by the Freundlich model with a linear regression correlation value of 0.9975. The adsorption of La3+ using the composite followed pseudo second-order kinetics. Thermodynamic studies have revealed that the negative values of Gibbs free energy confirmed the spontaneous and feasible nature of adsorption.

Original languageEnglish
Pages (from-to)20-29
Number of pages10
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume195
DOIs
StatePublished - 1 May 2015

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V.

Keywords

  • Adsorbent
  • Chitosan
  • Composite
  • FeO nanoparticles
  • Response surface methodology

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