L-cysteine/TiO2modified screen-printed graphite electrode for improved mercury and arsenic ions detection

Description

To address the challenges posed by the escalating heavy metal pollution, there is an urgent need for qualitative and quantitative assessments of these heavy metal ions. Consequently, extensive research efforts have been directed towards developing cost-effective electrochemical sensors. An electrochemical sensor based on a screen-printed electrode co-modified with titanium dioxide and L-cysteine for simultaneous detection of Hg(II) and As(III)was constructed. The successful binding of titanium dioxide and L-cysteine was confirmed by a scanning electron microscope(SEM), transmission electron microscopy(TEM),and Fourier transform infrared spectra(FTIR).The differential pulse voltammetry(DPV)results show that the limit of detection for the constructed sensor for arsenic and mercury ionswere0.43 μM and 0.64 μM, respectively. The iridium oxide modified reference electrode has greatly facilitated an improved reproducibility to the arsenic and mercury ions detection compared to its pristine screen-printed electrode. This work opens up a new venue for screen-printed electrode heavy metal detection.

Period	1 Sept 2022 → 15 Dec 2023
Examination held at	Xi'an Jiaotong-Liverpool University
Degree of Recognition	International