Authors:Fangli Fan, Huajie Ding, Jing Bai, Xiaolei Wu, Fuan Lei, Wei Tian, Yang Wang, and Zhi Qin
The sorption of uranium(VI) from aqueous solutions was investigated using synthesized magnesium silicate hollow spheres as
a novel adsorbent. Batch experiments were conducted to study the effects of initial pH, amount of adsorbent, contact time
and initial U(VI) concentrations on uranium sorption efficiency. The desorbing of U(VI) and the effect of coexisting ions
were also investigated. Kinetic studies showed that the sorption followed a pseudo-second-order kinetic model. The Langmuir
sorption isotherm model correlates well with the uranium sorption equilibrium data for the concentration range of 25–400 mg/L.
The maximum uranium sorption capacity onto magnesium silicate hollow spheres was estimated to be about 107 mg/g under the
experimental conditions. Desorption of uranium was achieved using inorganic acid as the desorbing agent. The practical utility
of magnesium silicate hollow spheres for U(VI) uptake was investigated with high salt concentration of intercrystalline brine.
This work suggests that magnesium silicate hollow spheres can be used as a highly efficient adsorbent for removal of uranium
from aqueous solutions.