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

被引：16

作者：

Liao, Dongyun ^{[1
]}

Liang, Guifang ^{[1
]}

Liu, Yuyao ^{[1
]}

Yan, Wenjun ^{[2
]}

Guo, Yujing ^{[1
]}

Liang, Wenting ^{[1
]}

Dong, Chuan ^{[1
]}

Fan, Lifang ^{[1
]}

机构：

[1] Shanxi Univ, Coll Chem & Chem Engn, Inst Environm Sci, Taiyuan 030006, Shanxi, Peoples R China

[2] Chinese Acad Sci, Inst Coal Chem, Analyt Instrumentat Ctr, Taiyuan 030001, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2023年 / 441卷

基金：

中国国家自然科学基金;

关键词：

Photoelectrochemical aptasensor; Polychlorinated biphenyls; TiO2; nanotubes; CdTe@CdS QDs;

D O I：

10.1016/j.jhazmat.2022.129901

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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.

引用

页数：12

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