Omega chrome black blue G as a colorimetric reagent for the microdetermination of various cations

Raheem, A. A. Abd El; Amin, A. A.; Osman, Farouk A.

doi:10.1007/bf00457072

Cited by 2 publications

(1 citation statement)

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“…Liang et al combined arsenazo III dye with gold nanoparticles and fabricated a new sensor for selective detection of uranyl ions [21]. The mono azo-dye omega chrome black G is widely used as an indicator for the volumetric determination of some metal ions [22]. To the best of our knowledge, no studies have applied omega chrome black G as a chemosensor for the visual detection of uranium from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Cubically cage-shaped mesoporous ordered silica for simultaneous visual detection and removal of uranium ions from contaminated seawater

et al. 2021

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There is an increasing interest in developing new technologies enabling the efficient detection and removal of radioactive pollution from seawater. Here, we report a dual-function organic-inorganic mesoporous structure 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, this corresponds to the range of concentration where the signal is linear against U(VI) concentration (i.e., 5 to 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 2 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.

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Section: Introductionmentioning

confidence: 99%