TY - JOUR ID - 133705 TI - Adsorption of Cd, Co and Zn from multi-ionic solutions onto Iranian sepiolite isotherms JO - Central Asian Journal of Environmental Science and Technology Innovation JA - CAJESTI LA - en SN - 2717-4034 AU - Samieifard, Ramin AU - Landi, Ahmad AU - Pourreza, Nahid AD - Department of soil sciences, Faculty of Agriculture & Natural Resources, University of Tehran, Karaj, Iran AD - Department of soil science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran AD - Department of Chemistry, Faculty of Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran Y1 - 2021 PY - 2021 VL - 2 IS - 3 SP - 102 EP - 118 KW - heavy metals KW - Environmental pollutions KW - Sepiolite KW - Langmuir and Freundlich DO - 10.22034/CAJESTI.2021.03.02 N2 - Nowadays, removal of heavy-metal contaminants from industrial waste waters is one of the most important environmental polemics which necessarily requires a solution. Clays, because of their low cost and unique chemical and structural properties have been widely used to remove heavy metals from aqueous solutions. In this investigation, sepiolite mineral was obtained from a mine near Fariman Township, Khorasan, Iran. The mineral samples used in this study were powdered with sizes less than 0.05 mm (-1). Langmuir and Freundlich isotherm models were investigated to illustrate the adsorption of heavy metals by natural and heat pre-treated sepiolites from aqueous solutions in two different pH values: 4 and 5. It was determined that the experimental data were more fitted to the Langmuir model (R2≈0.99) and it was observed that cobalt ions were more adsorbed than zinc and cadmium in the order of adsorbing regularity: Co>Zn>Cd. In this study, the quantities of released Mg2+ from the mineral structures were also investigated. In addition, changes in pH values in final solutions were investigated at the end of the experiments. UR - http://www.cas-press.com/article_133705.html L1 - http://www.cas-press.com/article_133705_72f572f923f59e90eec6db11b974c411.pdf ER -