Journal
RADIOCHIMICA ACTA
Volume 107, Issue 6, Pages 459-467Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/ract-2018-3077
Keywords
Uranium; adsorption; bacterial cellulose; phosphorylation
Funding
- National Key Research and Development Program [2016YFC1402507]
- National Natural Science Foundation of China [51578307]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13026]
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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 similar to 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 secondorder 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.
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