School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, People's Republic of China.
Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, Nanning, 530004, People's Republic of China.
Mikrochim Acta. 2021 Nov 5;188(12):410. doi: 10.1007/s00604-021-05063-x.
A terthiophene-functionalized mesoporous SBA-15 silica, i.e., TTU-SBA-15, was successfully developed and used as a highly selective and ultrasensitive fluorescence sensor for methyl orange (MO) detection. When the concentration of MO was increased, the fluorescence emission intensity of TTU-SBA-15 suspensions at 452 nm gradually decreased at an excitation wavelength of 368 nm, and the color of the suspension solutions changed obviously from blue to dark under 365 nm UV light. The fluorescence intensity at 452 nm was linearly proportional to the concentration of MO in the range 0.20 - 2.0 μM, with a detection limit of 0.092 μM. Competitive pollutants, variations in pH, and sample recycling had subtle or negligible effects on the detection of MO. TTU-SBA-15 was applied to the determination of MO in tap water, and recoveries from spiked samples were in the range 98.3 - 103.0%. This study provides a convenient and effective strategy to realize highly sensitive and selective sensors that could target dyes via the functional modification of mesoporous materials.
一种基于噻吩修饰的介孔 SBA-15 二氧化硅，即 TTU-SBA-15，被成功开发出来并用作一种高选择性和超灵敏的荧光传感器，用于检测甲基橙（MO）。当 MO 的浓度增加时，在激发波长为 368nm 时，TTU-SBA-15 悬浮液的 452nm 处的荧光发射强度逐渐降低，而在 365nm 紫外光下，悬浮液的颜色从蓝色明显变为深黑色。在 0.20-2.0μM 的范围内，452nm 处的荧光强度与 MO 的浓度呈线性关系，检测限为 0.092μM。竞争污染物、pH 值的变化和样品回收对 MO 的检测只有细微或可以忽略不计的影响。TTU-SBA-15 被用于自来水中 MO 的测定，加标样品的回收率在 98.3%-103.0%之间。本研究为通过介孔材料的功能修饰实现高灵敏度和选择性的染料靶向传感器提供了一种方便有效的策略。
