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Lead(II) adsorption on thiourea treated graphene oxide in aqueous solutions

Ersoy Özmen, Güliz
Lead poisoning has serious damages on the human health. The Pb+2 contamination in water affects the kidneys and nervous, cardiovascular, immune, reproductive and developmental systems resulting in Alzheimer's, Parkinson's and Schizophrenia diseases. One of the ways that human are exposed to lead is through water resources, therefore, removing lead from aqueous solutions is a significant issue in our everyday life. It is known that graphene oxide (GO) is a promising material to remove Pb+2 ions due to its high adsorption capacity. It is believed that treatment of GO by thiourea enhance the Pb+2 adsorption capacity due to raise in attachment points on the surface of the material. For this purpose, in this research GO and thiourea treated GO for 5 min (GO/TUT/5min), 40 min (GO/TUT/40min), 50 min (GO/TUT/50 min), 60 min (GO/TUT/60 min), 3 hours (GO/TUT/3 h), 24 hours at 70 °C (GO/TUT/24h) and 24 hours at 80 °C (r-GO) were prepared and characterized by FTIR, XRD and TGA. Their Pb+2 adsorption capacities were defined by ICP-MS. The adsorption capacities were found to be 1232 mg/g GO, 2042 mg/g GO/TUT/5min, 1891 mg/g GO/TUT/40min, 752 mg/g GO/TUT/50min, 1714 mg/g GO/TUT/60min, 1188 mg/g GO/TUT/3h, 1786 mg/g GO/TUT/24h and 763 mg/g r-GO. The observation of highest Pb+2 ion adsorption capacity for GO/TUT/5min might be due to existance of highest anchor points on the surface of sample and alteration of stack structure into almost individual layer.