Abstract
In this study, phosphate functionalized bacterial cellulose with micro-fibrous structure was prepared, characterized and applied for U(VI) adsorption. The successful grafting of phosphoric functional groups was proved by the FTIR spectra and EDS analysis (P~4.15 wt%), and the porous structure was confirmed by SEM and BET analyses. Furthermore, the effect of initial pH, contact time, initial concentration, and temperature were studied. The as-prepared adsorbent showed a high adsorption capacity at wide pH range (4.0–8.0) and its maximum adsorption capacity was calculated to be 50.65 mg/g. This endothermic adsorption process conformed to the pseudo second-order kinetic model and the Elovich kinetic models and the Langmuir isothermal models. According to the FTIR and XPS analysis, an adsorption mechanism was tentatively proposed, mainly due to the interaction between U(VI) and phosphoric groups.
Funding source: National Key Research and Development Program
Award Identifier / Grant number: 2016YFC1402507
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 51578307
Funding source: Program for Changjiang Scholars and Innovative Research Team in University
Award Identifier / Grant number: IRT-13026
Funding statement: The research was supported by the National Key Research and Development Program (2016YFC1402507), the National Natural Science Foundation of China (51578307) and the Program for Changjiang Scholars and Innovative Research Team in University (IRT-13026).
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