Iranian Nanotechnology Society International Journal of Nanoscience and Nanotechnology 1735-7004 13 2 2017 05 01 Removal of Pb(II) and Cu(II) Ions from ‎Aqueous Solutions by Cadmium Sulfide ‎Nanoparticles 105 117 25609 EN S. Golkhah Department of Chemistry, Semnan University, Semnan 35131-19111, Iran.‎ H. Zavvar Mousavi Department of Chemistry, Semnan University, Semnan 35131-19111, Iran.‎ H. Shirkhanloo Occupational and Environmental Health Research Center (OEHRC), Iranian Petroleum ‎Industry Health Research Institute (IPIHRI), Tehran 1485733111, Iran.‎ A. Khaligh Department of Chemistry, Semnan University, Semnan 35131-19111, Iran.‎ Journal Article 2015 05 09 <em>   In this study, cadmium sulfide nanoparticles (CdS NPs) were prepared, characterized and used as a new adsorbent for simultaneous removal of Pb(II) and Cu(II) ions from aqueous solutions. Using a batch adsorption method, the effects of solution pH, contact time, adsorbent dose, and temperature were studied and optimized. Removal efficiencies, higher than 98% were obtained for both the metal ions at the optimum conditions. The adsorption process was rapid, as equilibrium was achieved within 15 min. The kinetic and isotherm experiment data could be well described with the pseudo-second order kinetic model and the Freundlich isotherm model. The maximum adsorption capacities for Pb(II) and Cu(II) ions were 200 mg/g and 166.7 mg/g, respectively. The thermodynamics of adsorption process such as changes in standard free energy, enthalpy and entropy were also discussed. This study revealed that CdS NPs are effective adsorbent for rapid removal of Pb(II) and Cu(II) ions from aqueous solutions.</em> https://www.ijnnonline.net/article_25609_505b6ea93ea6842589972851cd79a1fc.pdf