Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 34, Pages 29337-29344Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b09419
Keywords
uranium sorption; ion-imprinting; mesoporous silica; radioactive; strong acid
Funding
- Natural Science Foundation of China [91326202, U1532111]
- Key Project of Natural Science Foundation of the Higher Education Institutions of Jiangsu Province [16KJA310001]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Qing-Lan Project of Jiangsu Province
- Jiangsu Key Laboratory of Radiation Medicine and Protection
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It is strategically important to recycle uranium from radioactive liquid wastes for future uranium supply of nuclear energy. However, it is still a challenge to adsorb uranium selectively from highly acidic and radioactive waste. In this paper, we report a novel strategy for effective uranium removal from highly acidic and radioactive media by surface ion-imprinted mesoporous silica sorbent. The sorbent was successfully synthesized by a co-condensation method with uranyl as the template ion and diethylphosphatoethyltriethoxysilane as the functional ligands. The pseudo-second-order model and Langmuir model showed better correlation with the sorption kinetic and isotherm data, and the sorption equilibrium could be reached within 40 min., the maximum adsorption capacity from Langmuir model was 80 mg/g in 1 mol/L nitric acid (HNO3) solution at 298.15 K. The sorbent Showed faster kinetics and higher selectivity toward uranium over other ions compared with nonimprinted mesoporous and other previous sorbents. Furthermore, the ion-imprinted materials exhibited remarkable radioresistance stability and could be regenerated efficiently after five cycles. This work may provide a new approach for highly efficient sorption of uranium from strong HNO3 and radioactive media.
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