Citation: OU Pan-Pan, WEI Fu-Cun, WU Ye-Yu, TANG Xiao-Qiang, CHEN Zhi-Fan, WU Jia-Wen, LIN Yu, TAN Xue-Cai. A Photoelectrochemical Sensor for Sensitive Detection of Hg²⁺ Based on M-TiO₂-CdSe Quantum Dots Composite Material[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(11): 1897-1907. doi: 10.19756/j.issn.0253-3820.210513 shu

A Photoelectrochemical Sensor for Sensitive Detection of Hg²⁺ Based on M-TiO₂-CdSe Quantum Dots Composite Material

Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commission, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products, Key Laboratory of Guangxi Colleges and Universities for Food Safety and Pharmaceutical Analytical Chemistry, School of Chemistry and Chemical and Engineering, Guangxi University for Nationalities, Nanning 530008, China

Corresponding author: TAN Xue-Cai, gxunxctan@126.com
Received Date: 19 May 2021
Revised Date: 26 August 2021

Fund Project: Supported by the National Natural Science Foundation of China (No.21365004), the Key Research and Development Project of Guangxi (No.AB18126048), the Guangxi Innovation-driven Development Special Fund Project (No.AA18118013-10), the Specific Research Project of Guangxi for Research Bases and Talents (No.AD18126005), Young and Middleaged Teachers Basic Ability Promotion Project by Guangxi Education Department (No.2019KY0162), the Innovation Project of Guangxi University for Nationalities Graduate Education (No.gxun-chxps202077).

A novel and simple photoelectrochemical (PEC) sensor for ultrasensitive detection of mercury ion (Hg²⁺) was fabricated based on metal organic framework-derived porous titanium dioxide-cadmium selenide quantum dots (M-TiO₂-CdSe QDs) composites. The morphology and structure of different materials were characterized by field emission scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). The performance of the sensor was studied by current time method (i-t) and electrochemical impedance spectroscopy technology (EIS). The results showed that the prepared M-TiO₂ not only retained the original morphology and structure of MIL-125(Ti), but also exhibited more abundant pore structure and good PEC properties. Comparing with M-TiO₂, the as-prepared M-TiO₂-CdSe QDs nanocomposite exhibited excellent PEC performances including about 2-fold enhancement of photocurrent intensity, which were ascribed to the large surface of M-TiO₂ and the introduction of CdSe QDs. Based on the selective inhibitory effect of Hg²⁺ on the photocurrent intensity of the M-TiO₂-CdSe QDs PEC system, a novel PEC sensor for Hg²⁺ concentration determination was constructed, with a wide linear response range of 0.005-5 nmol/L and a detection limit of 4.2 pmol/L (S/N=3). The detection method was used for analysis of Hg²⁺ in real water samples with the spiked recoveries of 96%-110%, and the possible detection mechanism of the M-TiO₂-CdSe QDs PEC system was also discussed.
- Photoelectrochemical sensor,
- Metal-organic-framework-derived porous titanium dioxide,
- CdSe quantum dots,
- Mercury ion
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A Photoelectrochemical Sensor for Sensitive Detection of Hg2+ Based on M-TiO2-CdSe Quantum Dots Composite Material

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通讯作者: 陈斌, bchen63@163.com

A Photoelectrochemical Sensor for Sensitive Detection of Hg²⁺ Based on M-TiO₂-CdSe Quantum Dots Composite Material