Yang Hongli, Huang Yongxin, Zhao Yanjun, Fan Aiping
School of Pharmaceutical Science and Technology, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University.
Anal Sci. 2019 May 10;35(5):551-556. doi: 10.2116/analsci.18P502. Epub 2019 Jan 18.
A simple and sensitive chemiluminescent (CL) sensing platform for mercury(II) ions (Hg) in water was developed based on monolayer molybdenum disulfide (MoS). The layered MoS can catalyze the oxidation of luminol by HO, producing an enhanced CL signal because of the peroxidase-like activity of the layered MoS. In addition, MoS has a good adsorption ability to Hg because of the inherent affinity of Hg to sulfur contained in MoS. Interestingly, the pre-incubation of Hg with layered MoS inhibited the catalytic activity of MoS on the luminol-HO-MoS CL reaction, leading to CL quenching. The CL intensity decreased linearly with increasing concentration of Hg from 0.005 - 40 μM. The limit of detection (LOD) was estimated to be 1 nM. The relative standard deviation (RSD) was found to be 3.71%, indicating good reproducibility. The recoveries of Hg spiked in tap water were from 100.0 to 116.0% with RSD from 2.7 to 5.6%, detected by the standard addition method, and demonstrated good applicability.
基于单层二硫化钼（MoS）开发了一种用于检测水中汞离子（Hg）的简单且灵敏的化学发光（CL）传感平台。层状MoS可催化鲁米诺被HO氧化，由于层状MoS具有类过氧化物酶活性，从而产生增强的CL信号。此外，由于Hg对MoS中所含硫的固有亲和力，MoS对Hg具有良好的吸附能力。有趣的是，Hg与层状MoS预孵育会抑制MoS对鲁米诺-HO-MoS CL反应的催化活性，导致CL猝灭。CL强度随Hg浓度从0.005 - 40 μM增加而呈线性下降。检测限（LOD）估计为1 nM。相对标准偏差（RSD）为3.71%，表明重现性良好。通过标准加入法检测，自来水中加标Hg的回收率为100.0%至116.0%，RSD为2.7%至5.6%，显示出良好的适用性。
