Edris Bazrafshan - Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran;
Ayat Hossein Panahi - Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran;
Mohamad havangi - Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran;

Excess fluoride in drinking water causes harmful effects such as dental and skeletal fluorosis. Hence, its concentration in drinking water must not exceed a certain range. This study investigated the removal of fluoride (F) from aqueous solutions with CuO nanoparticles using a rangeof experimental approaches, including pH, adsorbent dose, contact times, and initial F concentration, were investigated. The equilibrium adsorption data were analyzed using Langmuir and Freundlich adsorption models. The maximum uptake value of F was 3152 mg/g at pH 5 during 40 min with 0.005 g/L nanoparticles of CuO for initial F concentration equal 5 mg/L. The fluoride adsorption equilibriumover the adsorbent was well described by the Freundlich model. The findings of this study showed that CuO nanoparticles are quite effective for F removal from aqueous environments. Thermodynamic analyses showed that the adsorption of F onto CuO nanoparticles was endothermic and spontaneous.

Adsorption; Cupric oxide nanoparticles; Fluoride removal