School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China.
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Feb 5;246:118974. doi: 10.1016/j.saa.2020.118974. Epub 2020 Sep 23.
We combined the virtues of mesoporous silica and organic functional groups to develop a hybrid fluorescent sensor, PyU-SBA-15, with excellent ability to detect Hg in aqueous medium with high selectivity. In this sensor, the pyrene fluorophore acts as the reporter and the urea unit acts as the receptor during Hg determination. The control material, PyH-SBA-15, which lacks a carbonyl group in the receptor portion, did not display metal-ion selectivity, thereby demonstrating that introducing an additional metal-chelating unit is necessary to improve the metal-ion selectivity of the hybrid sensor. When the concentration of Hg was increased, the fluorescence emission intensities of PyU-SBA-15 at 379, 398, and 476 nm gradually decreased. The emission intensity at 379 nm was linearly proportional to Hg concentrations in the range of 0-1.0 × 10 M, and the sensor was determined to have a detection limit of 9.92 × 10 M. This work provides an effective strategy for improving or modulating the metal-ion selectivity of fluorescent sensors based on organic-inorganic hybrid mesoporous silica systems.
我们结合介孔硅和有机官能团的优点，开发了一种混合荧光传感器 PyU-SBA-15，它具有在水介质中高选择性检测 Hg 的优异能力。在该传感器中，芘荧光团作为报告基团，脲单元在 Hg 测定中作为受体。对照材料 PyH-SBA-15 缺少受体部分的羰基，没有显示出金属离子选择性，从而表明引入额外的金属螯合单元对于提高混合传感器的金属离子选择性是必要的。当 Hg 浓度增加时，PyU-SBA-15 在 379、398 和 476nm 处的荧光发射强度逐渐降低。379nm 处的发射强度与 0-1.0×10-6M 范围内的 Hg 浓度呈线性关系，传感器的检测限为 9.92×10-6M。这项工作为提高或调节基于有机-无机杂化介孔硅体系的荧光传感器的金属离子选择性提供了一种有效的策略。
