We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Cubically cage-shaped mesoporous ordered silica for simultaneous visual detection and removal of uranium ions from contaminated seawater.
- Authors
Tolan, Dina A.; Elshehy, Emad A.; El-Said, Waleed A.; Taketsugu, Tetsuya; Yoshizawa, Kazunari; El-Nahas, Ahmed M.; Kamali, Ali Reza; Abdelkader, Amr M.
- Abstract
A dual-function organic-inorganic mesoporous structure is reported for naked-eye detection and removal of uranyl ions from an aqueous environment. The mesoporous sensor/adsorbent is fabricated via direct template synthesis of highly ordered silica monolith (HOM) starting from a quaternary microemulsion liquid crystalline phase. The produced HOM is subjected to further modifications through growing an organic probe, omega chrome black blue G (OCBBG), in the cavities and on the outer surface of the silica structure. The spectral response for [HOM-OCBBG → U(VI)] complex shows a maximum reflectance at λmax = 548 nm within 1 min response time (tR); the LOD is close to 9.1 μg/L while the LOQ approaches 30.4 μg/L, and this corresponds to the range of concentration where the signal is linear against U(VI) concentration (i.e., 5-1000 μg/L) at pH 3.4 with standard deviation (SD) of 0.079 (RSD% = 11.7 at n = 10). Experiments and DFT calculations indicate the existence of strong binding energy between the organic probe and uranyl ions forming a complex with blue color that can be detected by naked eyes even at low uranium concentrations. With regard to the radioactive remediation, the new mesoporous sensor/captor is able to reach a maximum capacity of 95 mg/g within a few minutes of the sorption process. The synthesized material can be regenerated using simple leaching and re-used several times without a significant decrease in capacity.
- Subjects
URANIUM; MESOPOROUS silica; LIQUID crystal states; URANIUM oxides; IONS; URANIUM compounds; SPECTRAL sensitivity; SEAWATER
- Publication
Microchimica Acta, 2022, Vol 189, Issue 1, p1
- ISSN
0026-3672
- Publication type
Article
- DOI
10.1007/s00604-021-05083-7