Abstract
To overcome the limits of low adsorption capacity and the separation difficulty of solid from liquid phase for graphene oxide (GO), a novel nanocomposite graphene oxide-manganese oxide (GOMO) was facilely fabricated under ultrasonic radiation. The structures and micro-morphology of the products were characterized by fourier transform infrared (FT-IR) spectroscopy, raman shift spectroscopy, X-ray diffraction (XRD) pattern and scanning electron microscopy (SEM). The effect of solution pH, adsorbent dose, contact time, initial uranium concentration, ionic strength and temperature on uranium removal efficiency was studied by batch adsorption experiments. The product GOMO was used to examine the feasibility of the removal of high salt content in uranium-containing wastewater. The adsorption results were fitted using the Langmuir and Freundlich isotherm models. The kinetic parameters in the adsorption process were measured and fitted. Five adsorption/desorption cycles were performed using 3 M HNO3 as the regenerant in order to evaluate the reuse of GOMO.
Highlights
The removal and recovery of nuclide uranium with a long half-life and hazardous radio-toxicity has been regarded as one of the most important and challenging research problems
The results proved that graphene oxide–manganese oxides (GOMO) could be used repeatedly for U(VI) adsorption, and the removal rate of uranium decreased only slightly through five cycles
A composite adsorbent GOMO was successfully synthesized by a facile ultrasonic radiation method
Summary
The removal and recovery of nuclide uranium with a long half-life and hazardous radio-toxicity has been regarded as one of the most important and challenging research problems. Graphene oxide (GO) with abundance of oxygen-containing groups (e.g., carboxyl and hydroxyl) has obtained plenty of attention owing to its large specific surface area, excellent adsorption performance and unique electronic properties[14,15]. It is well-known that some typical competing cations (e.g., Na+, K+, Mg2+, and Ca2+) commonly present in wastewater probably produce a certain interference for the adsorption capacity of GO as the adsorbent. We modified the GO surface with MnxOy by the ultrasonic method and prepared the novel composite adsorbent graphene oxide–manganese oxides (GOMO). The feasibility of the removal of high salt content in the wastewater samples using GOMO was evaluated in this study
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