Preparation of novel Ce (IV)-based MOF/GO composite and its highly effective phosphate removal from aqueous solution

Abstract

In this study, a cerium- Metal-Organic Framework /Graphene Oxide (Ce-MOF/GO) composite material with highly efficient phosphate removal was synthesized via a solvothermal method. The physiochemical properties and removal mechanism of phosphate on composite material were analyzed by Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and Brunauer-Emmett-Teller (BET). The influencing parameters such as, effect of reaction time, solution pH, initial concentration, adsorbent dosage, and temperature on the adsorption capacity of the adsorbent were investigated. The kinetic and isothermal adsorption data were consistent with the pseudo-second-order model and the Langmuir adsorption isotherm model. The result shows that the maximum adsorption capacity of Ce-MOF/GO-2% composite for phosphate removal was 308. 64 mg g-1, which is higher than that of Ce-MOF. The adsorbent shows excellent reusability and after four adsorption/regeneration cycles, still maintains (92%) adsorption capacity.