Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 366, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2022.131979
Keywords
Photoelectrochemical; Aptasensor; 3?; 4? -Tetrachlorobiphenyl; Z-Scheme; Cation exchange
Funding
- National Natural Science Foundation of P. R. China [51762005, U20A20206]
- Key Projects of Guangxi Natural Science Foundation [2020GXNSFDA297015]
- Natural Science Foundation of Guangxi Province [2022GXNSFAA035565]
- Universities in Guangxi young and middle-aged teachers? [2021KY0771]
- basic ability improvement projects [2018YB032]
- Guangxi Normal University for Nationalities
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A novel photoelectrochemical (PEC) aptasensor coupled with a Z-scheme was developed for the quantitative determination of sub-picogram per liter concentration of tetrachlorobiphenyl. The proposed method showed better photocatalytic activity and photo-to-current conversion efficiency without biased voltage. The PEC aptasensor demonstrated high sensitivity and specificity, making it a potentially valuable tool for detecting polychlorinated biphenyls in marine organisms.
A novel photoelectrochemical (PEC) aptasensor coupled with a Z-scheme was developed to realize quantitative determination of 3,3 ',4,4 '-tetrachlorobiphenyl (PCB77) at a concentration of sub-picogram per liter. The PEC aptasensor was fabricated by immobilizing ZnSe/Ag2Se on indium-tin oxide (ITO) that could covalently bind sulfurized aptamer. Meanwhile, complementary DNA-functionalized CdTe units were used as the sensitizers, and these were immobilized on the aptamer to form Z-scheme dual-photosystem (PS). The Z-scheme PS based on both ZnSe/Ag2Se and CdTe would be provided with better photocatalytic activity than conventional heterojunctions, and improving the photo-to-current conversion efficiency without biased voltage. Following the process of hatching, PCB77 was captured via the aptamer on the PEC aptasensor, producing aptamer-PCB77 complexes with weak conductive performance. Using the photocurrent change as a response signal for the quantitative detection of PCB77, the detection limits of the proposed method were 0.05 pg L-1 and 0.22 ng L-1 for the linear ranges of 0.01-500 pg L-1 and 0.5-105 ng L-1, respectively. Compared with other technologies, the PEC aptasensor is more flexible, sensitive, specific and rapid in the absence of biased voltage under visble light. The results presented herein can potentially help build a model for the detection of various polychlorinated biphenyls (PCBs) with stable chemical properties and insulation performances that can be used to study persistent organic pollutants (POPs) in marine organisms and in the analysis of environmental conditions.
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