Cui Xiao, Yuqing Zhao, Cui Jiantao, Zheng Qian, Bo Wang
Software Engineering College, Zhengzhou University of Light Industry, Zhengzhou 450001, PR China.
School of Civil Engineering and Communication, North China University Of Water Resources and Electric Power, Zhengzhou 450045, Henan, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Feb 15;191:442-453. doi: 10.1016/j.saa.2017.10.050. Epub 2017 Oct 18.
The following paper reported and discussed a nitrite ion optical sensing platform based on a core-shell structure, using superamagnetic nanoparticles as the core, a silica molecular sieve MCM-41 as the shell and two rhodamine derivatives as probe, respectively. This superamagnetic core made this sensing platform reclaimable after finishing nitrite ion sensing procedure. This sensing platform was carefully characterized by means of electron microscopy images, porous structure analysis, magnetic response, IR spectra and thermal stability analysis. Detailed analysis suggested that the emission of these composite samples was quenchable by nitrite ion, showing emission turn off effect. A static sensing mechanism based on an additive reaction between chemosensors and nitrite ion was proposed. These composite samples followed Demas quenching equation against different nitrite ion concentrations. Limit of detection value was obtained as low as 0.4μM. It was found that, after being quenched by nitrite ion, these composite samples could be reclaimed and recovered by sulphamic acid, confirming their recyclability.
以下论文报道并讨论了一种基于核壳结构的亚硝酸根离子光学传感平台，该平台分别以超顺磁性纳米粒子为核，二氧化硅分子筛MCM - 41为壳，并以两种罗丹明衍生物作为探针。这种超顺磁性核使得该传感平台在完成亚硝酸根离子传感过程后可回收利用。通过电子显微镜图像、多孔结构分析、磁响应、红外光谱和热稳定性分析等手段对该传感平台进行了详细表征。详细分析表明，这些复合样品的发射可被亚硝酸根离子猝灭，呈现发射关闭效应。提出了一种基于化学传感器与亚硝酸根离子之间加成反应的静态传感机制。这些复合样品针对不同浓度的亚硝酸根离子遵循德马斯猝灭方程。检测限低至0.4μM。研究发现，这些复合样品在被亚硝酸根离子猝灭后，可用氨基磺酸回收并恢复，证实了它们的可回收性。
