Analytical Sciences

Abstract − Analytical Sciences, 35(5), 551 (2019).

Sensitive Chemiluminescent Sensing Method for Mercury(II) Ions Based on Monolayer Molybdenum Disulfide
Hongli YANG, Yongxin HUANG, Yanjun ZHAO, and Aiping FAN
School of Pharmaceutical Science and Technology, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, 300072, Tianjin, PR China
A simple and sensitive chemiluminescent (CL) sensing platform for mercury(II) ions (Hg2+) in water was developed based on monolayer molybdenum disulfide (MoS2). The layered MoS2 can catalyze the oxidation of luminol by H2O2, producing an enhanced CL signal because of the peroxidase-like activity of the layered MoS2. In addition, MoS2 has a good adsorption ability to Hg2+ because of the inherent affinity of Hg2+ to sulfur contained in MoS2. Interestingly, the pre-incubation of Hg2+ with layered MoS2 inhibited the catalytic activity of MoS2 on the luminol–H2O2–MoS2 CL reaction, leading to CL quenching. The CL intensity decreased linearly with increasing concentration of Hg2+ 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 Hg2+ 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.