Citation: WEI Fu-Cun, OU Pan-Pan, WU Ye-Yu, WU Jia-Wen, LIN Yu, DU Fang-Kai, TAN Xue-Cai. Construction of Electrochemiluminescence Sensor for Detection of Coper Ion Based on Novel Porous Titanium Dioxide Coupled Cadmium Sulfide Quantum Dots[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(8): 1308-1317. doi: 10.19756/j.issn.0253-3820.201678 shu

Construction of Electrochemiluminescence Sensor for Detection of Coper Ion Based on Novel Porous Titanium Dioxide Coupled Cadmium Sulfide Quantum Dots

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, gxuntan@126.com
Received Date: 15 November 2020
Revised Date: 22 April 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), the Young and Middle Aged Teachers Basic Ability Promotion Project by Guangxi Education Department (No.2019KY0162), and the Graduate Education Innovation Plan of Guangxi University for Nationalities (No.gxun-chxzs2019018).

A novel porous titanium dioxide (P-TiO₂) was successfully synthesized via calcination of metal-organic framework MIL-125(Ti). Then P-TiO₂ was coated with massive polyethyleneimine films and further bound covalently with 3-mercaptopropionic acid stabilized cadmium sulfide quantum dots (CdS QDs) to prepare P-TiO₂/CdS QDs composites. The as-prepared P-TiO₂/CdS QDs was modified on the surface of glassy carbon electrode to develop a sensitive electrochemiluminescence (ECL) sensor for detection of Cu²⁺. The morphology, microstructure and element composition of different materials were characterized by scanning electron microscope, X-ray powder diffraction, energy disperse spectroscopy, ultraviolet-visible absorption spectrometry, fluorescence spectrometry and infrared spectrometry, respectively. The electrochemical behavior and ECL performance of the sensor were also studied by cyclic voltammetry, electrochemical impedance and ECL technique. Under the optimized conditions, the proposed sensor demonstrated excellent analytical performance with a wide linear detection range from 3 nmol/L to 530 nmol/L (R²=0.9989) and a detection limit of 0.01 nmol/L (S/N=3) for Cu²⁺. This method exhibited excellent stability, reproducibility and selectivity. In addition, the detection results of Cu²⁺ in water samples were similar to that of inductively coupled plasma-atomic emission spectrometry method (ICP-AES) with recovery rates of 96.9%-105.8%.
- Porous titanium dioxide,
- Cadmium sulfide quantum dots,
- Electrochemiluminescence sensor,
- Copper ion
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