Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University, Alkharj, 11942, Saudi Arabia.
Chemistry Department, Faculty of Science, Menoufia University, Menoufia, Egypt.
Mikrochim Acta. 2021 Dec 2;189(1):3. doi: 10.1007/s00604-021-05083-7.
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 λ = 548 nm within 1 min response time (t); 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.
报道了一种具有双重功能的有机-无机介孔结构，可用于从水溶液中进行铀酰离子的肉眼检测和去除。介孔传感器/吸附剂是通过从四元微乳液液晶相直接模板合成高度有序的二氧化硅单体（HOM）来制备的。所得的 HOM 通过在空腔中和二氧化硅结构的外表面上生长有机探针ω铬黑蓝 G（OCBBG）进一步进行修饰。[HOM-OCBBG→U（VI）]配合物的光谱响应在 1 分钟响应时间（t）内于 λ=548nm 处显示最大反射率；LOD 接近 9.1μg/L，LOQ 接近 30.4μg/L，这对应于信号与 U（VI）浓度呈线性关系的浓度范围（即 5-1000μg/L）在 pH3.4 下，标准偏差（SD）为 0.079（RSD%=11.7，n=10）。实验和 DFT 计算表明，在有机探针和铀酰离子之间存在强结合能，形成具有蓝色的配合物，即使在低铀浓度下也可以用肉眼检测到。关于放射性修复，新的介孔传感器/捕获剂在吸附过程的几分钟内能够达到 95mg/g 的最大容量。该合成材料可以通过简单的浸出进行再生，并在容量没有明显下降的情况下重复使用几次。
