Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 615, Issue -, Pages 549-557Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2017.09.324
Keywords
Radioactive iodide; Montmorillonite; Response surface methodology; Optimization; Adsorption
Categories
Funding
- Human Resource Training Program for Regional Innovation and Creativity through the Ministry of Education (ME)
- National Research Foundation (NRF) of Korea [NRF-2014H1C1A1066929]
- ME of Korea [NRF-2009-0093819, NRF-2016R1A2B4010431]
- NRF of Korea [NRF-2009-0093819, NRF-2016R1A2B4010431]
- NRF grant from the Korean government (MSIP) [NRF-2015M2A7A1000194]
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Magnetite nanoparticles supported on organically modified montmorillonite (MNP-OMMTs) were successfully synthesized by a facile coprecipitation method. The surface of natural clay was modified using a cationic surfactant, hexadecyltrimethylammonium. The synthesized MNP-OMMTs were used as an adsorbent to remove iodide from aqueous solutions. The maximum adsorption capacity of the adsorbent was 322.42 mg/g, which is much higher than other previously reported adsorbents for removing iodide in aqueous solution. The experimental data were well fitted to a pseudo-second-order kinetic model, and the adsorption behavior followed the Langmuir isotherm. A thermodynamic study indicated that iodide adsorption was spontaneous and endothermic. The individual and combined effects of key process parameters (pH, temperature, and initial iodide concentration) were studied using a response surface methodology. The maximum iodide removal efficiency of 93.81% was obtained under the optimal conditions of pH 3.9, a temperature of 41.3 degrees C, and an initial iodide concentration of 113.8 mg/L. (C) 2017 Elsevier B.V. All rights reserved.
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