Design an efficient photoelectrochemical aptasensor for PCB72 based on CdTe@CdS core@shell quantum dots-decorated TiO2 nanotubes

Dongyun Liao; Guifang Liang; Yuyao Liu; Wenjun Yan; Yujing Guo; Wenting Liang; Chuan Dong; Lifang Fan

doi:10.1016/j.jhazmat.2022.129901

Design an efficient photoelectrochemical aptasensor for PCB72 based on CdTe@CdS core@shell quantum dots-decorated TiO₂ nanotubes

J Hazard Mater. 2023 Jan 5:441:129901. doi: 10.1016/j.jhazmat.2022.129901. Epub 2022 Sep 3.

Authors

Dongyun Liao¹, Guifang Liang¹, Yuyao Liu¹, Wenjun Yan², Yujing Guo¹, Wenting Liang¹, Chuan Dong¹, Lifang Fan³

Affiliations

¹ Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi 030006, PR China.
² Analytical Instrumentation Center, Institute of Coal Chemistry, CAS, Taiyuan 030001, PR China.
³ Institute of Environmental Science, College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, Shanxi 030006, PR China. Electronic address: flf@sxu.edu.cn.

PMID: 36084454
DOI: 10.1016/j.jhazmat.2022.129901

Abstract

In this work, an efficient and novel photoelectrochemical (PEC) aptasensor for 2,3',5,5'-tetrachlorobiphenyl (PCB72) was constructed based on CdTe@CdS core@shell quantum dots (CdTe@CdS QDs)-decorated TiO₂ nanotubes (TiO₂ NTs). CdTe@CdS QDs were prepared by the combination of CdTe and CdS with a proper lattice mismatch. Due to their large band offsets, core@shell QDs can reduce undesirable carrier recombination, significantly improving their charge separation efficiency. Then the synthesized CdTe@CdS QDs were modified on TiO₂ NTs (CdTe@CdS QDs/TiO₂ NTs) through electrostatic adsorption method. The as-prepared composites exhibit a wide visible light absorption range, good PEC activity and high photoelectric conversion efficiency. Also, the PEC aptasensor prepared via the immobilization of anti-PCB72 aptamer on the composites exhibits outstanding analytical performance with high sensitivity and specificity for PCB72 under visible-light irradiation, achieving a detection limit as low as 0.03 ng/L. It was also applied to detect PCB72 in four different real environmental samples with satisfactory results.

Keywords: CdTe@CdS QDs; Photoelectrochemical aptasensor; Polychlorinated biphenyls; TiO(2) nanotubes.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Cadmium Compounds*
Electrochemical Techniques
Nanotubes*
Quantum Dots*
Tellurium
Titanium

Substances

Cadmium Compounds
titanium dioxide
Titanium
Tellurium
cadmium telluride