Affiliation:
1. College of Food Science and Engineering/Collaborative Innovation Center for Modern Grain Circulation and Safety/Key Laboratory of Grains and Oils Quality Control and Processing Nanjing University of Finance and Economics Nanjing China
2. Changzhou Food and Drug Fiber Quality Supervision and Inspection Center Changzhou China
3. Hebei Key Laboratory of Food Safety Hebei Food Inspection and Research Institute Shijiazhuang China
Abstract
AbstractIn this work, an ultrasensitive electrochemical sensor based on Zr‐MOF‐SH/rGA/NPG was developed for the first time for the rapid determination of mercury ions. First, nanoporous gold (NPG) film was covered on the glassy carbon electrode (GCE) to offer a desirable substrate. Then, Zr‐MOF‐SH/rGA composites were dropped on the NPG film to form a modified electrode. Mercapto functionalized MOFs (Zr‐MOF‐SH) showed strong adsorption capability toward mercury ions, and the unique structure of reduced graphene oxide aerogel (rGA) provided various sites for coupling with Zr‐MOF‐SH as well as improved the electrochemical activity. As a consequence of the synergistic effect of Zr‐MOF‐SH, rGA, and NPG, the optimized Zr‐MOF‐SH/rGA/NPG/GCE sensor showed excellent detection performance toward mercury ions with a linear range from 0 to 200 nM and a low limit of detection of 1.4 nM. Meanwhile, the fabricated electrochemical sensor exhibited outstanding stability, reproducibility, and anti‐interference ability. To verify the practical applicability, the Zr‐MOF‐SH/rGA/NPG/GCE was applied for the determination of mercury ions in real rice samples with desirable recovery rates ranging from 98.8% to 108.3%.
Funder
Priority Academic Program Development of Jiangsu Higher Education Institutions
National Natural Science Foundation of China