Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 195, Issue -, Pages 20-29Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2015.01.006
Keywords
Chitosan; Fe3O4 nanoparticles; Composite; Adsorbent; Response surface methodology
Funding
- National Research Foundation of Korea (NRF) grant - Korea government Ministry of Education, Science and Technology (MEST) [2010-C1AAA001-0029018]
- Basic Science Research Program through the National Research Foundation of Korea(NRF) - Ministry of Science, ICT & Future Planning [2014R1A5A1009799]
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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 degrees 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. (C) 2015 Elsevier B.V. All rights reserved.
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