Facile preparation and adsorption performance of graphene oxide-manganese oxide composite for uranium

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.

Modulation of Conductivity of Alginate Hydrogels Containing Reduced Graphene Oxide through the Addition of Proteins

“…Among adsorption kinetic mathematical models, the low R 2 values calculated in the pseudo-first-order model (0.35–0.82), with vast difference between estimated qe and experimental qt ( Table 2 ), discarded this model for describing adsorption phenomena on the rGO surface. However, the pseudo-second-order model showed high R 2 values (0.93–0.99) and convergence between the estimated qe and the experimental qt values ( Table 2 ); therefore, this model can be considered the best kinetic model to define the studied protein adsorption phenomena on the rGO surface [ 58 , 59 ]. Interestingly, pseudo-second-order constant K 2 reduced while hydrophilicity increased with the lowest K 2 for elastin (2.16·µg −1 ·in −1 ) and with the highest for collagen (27.27 µg·µg −1 ·min −1 ).…”

Ultra-thin iron phosphate nanosheets for high efficient U(VI) adsorption

“…The excellent adsorption performance of two-dimensional materials(e.g. grapheme oxide-manganese oxide [49], MXene [50], MoS 2 [51] LDHs [52, 53]) in the field of radioactive adsorption indicates that increasing the specific surface area of materials is an extremely effective means to improve their adsorption performance. Li’s group [40] dispersed phosphate groups on the graphene oxide (PGO) nanosheets with a chemical process to increase the usage of phosphate group.…”

Fast and High Amount of U(VI) Uptake by Functional Magnetic Carbon Nanotubes with Phosphate Group

“…Among the different methods for removing uranium from wastewater, the sorption method has been proven to be the most effective . Numerous sorbents have been reported in the literature, for example, graphene oxide, − metal–organic frameworks (MOFs), − mesoporous silica nanospheres, polymers, , magnesium oxide foam, and chitosan …”