Removal of Co(II) from Water Using Graphene Oxide Functionalized with TOPO

Abstract

Abstract One of the most immensely adsorbents for removing radioactive waste from water is graphene oxide nanosheet (GO). It has a large specific surface area and a variety functional groups, including epoxide, carbonyl, carboxyl, and hydroxyl. This work has prepared GO and functionalized with TOPO (Tri-octyl phosphine oxide). Raman spectroscopy, XRD, High-Resolution Transmission Electron Microscopy (HRTEM), and Fourier transform infrared spectroscopy utilized the unfunctionalized and functionalized GO samples. The results indicate that the produced GO-TOPO adsorbents are very effective Co (II) adsorbents in the acidic medium. The maximum adsorption of Co (II) adsorbed on GO-TOPO was approximately 134 mg/g. The ideal conditions for eliminating Co (II) from water are pH of 6 and temperature 40 °C. Langmuir and Freundlich equations have been used to describe the isothermal data. According to R square, the Langmuir model was better than the Freundlich model.