화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.31, No.4, 630-638, April, 2014
DOI10.1007/s11814-013-0285-3  Export Citation
Reductive removal of hexavalent chromium from aqueous solution using sepiolite-stabilized zero-valent iron nanoparticles: Process optimization and kinetic studies
Amirhosein Ramazanpour Esfahani†, Saeid Hojati, Amin Azimi1, Leila Alidokht2, Alireza Khataee3, †, and Meysam Farzadian
  • Department of Soil Science, Faculty of Agriculture, Shahid Chamran University, Ahvaz, Iran
  • 1Department of Soil Science, Faculty of Agriculture, Islamic Azad University of Science and Research of Khorasgan, Esfahan, Iran
  • 2Department of Soil Science, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
  • 3Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
E-mail:,
We studied the optimization of hexavalent chromium (Cr(VI)) removal from aqueous solution using the synthesized zero-valent iron nanoparticles stabilized with sepiolite clay (S-ZVIN), under various parameters such as reaction time (min), initial solution pH and concentration of S-ZVIN (g·L^(-1)) using response surface methodology (RSM). The kinetic study of Cr(VI) was conducted using three types of the most commonly used kinetic models including pseudo zero-order, pseudo first-order, and pseudo second-order models. The rate of reduction reaction showed the best fit with the pseudo first-order kinetic model. The process optimization results revealed a high agreement between the experimental and the predicted data (R2=0.945, Adj-R2=0.890). The results of statistical analyses showed that reaction time was the most impressive factor influencing the efficiency of removal process. The optimum conditions for maximum response (98.15%) were achieved at the initial pH of 4.7, S-ZVIN concentration of 1.3 g·L^(-1) and the reaction time of 75 min.
Keywords:Zero-valent Iron;Sepiolite;Hexavalent Chromium;Response Surface Methodology;Central Composite Design
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