title: A highly selective and picomolar level photoelectrochemical sensor for PCB 101 detection in environmental water samples.
abstract: A highly selective and sensitive photoelectrochemical (PEC) sensor was fabricated for fast and convenient detection of PCB 101 in environmental water samples with a low detection limit of 1.0×10(-14)molL(-1) based on single crystalline TiO2 nanorods (NRs). By integration with molecular imprinting (MI) technique, the PEC sensor's selectivity towards PCB 101 was significantly improved, so that the interference caused by 100-fold excess of PCB 126 and PCB 77 which had similar structure with PCB 101 was below 37%, not to mention other coexisted pollutants. This high selectivity could be attributed to the high-quality expression of the molecular imprinting sites on the rigid and smooth surface of single crystalline TiO2 NRs on which PCB 101 could be selectively and preferentially adsorbed. The oriented and multiple halogen bonds formed between PCB 101 and the molecular imprinting sites played a critical role in improving the recognition ability of the PEC sensor. Meanwhile, the one dimensional nanorods structure of TiO2 was beneficial for the efficient separation of photogenerated electrons and holes, leading to enhanced photocurrent response and further improving the sensitivity of the PEC sensor.
authors.affiliation: Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors.forename: Huijie
authors.initials: H
authors.lastname: Shi
authors.affiliation: Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors.forename: Jinzhi
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai 200092, China.
authors.forename: Yingling
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai 200092, China. Electronic address: g.zhao@tongji.edu.cn.
authors.forename: Guohua
authors.initials: G
authors.lastname: Zhao
mesh_terms: D003460:Crystallization; D055664:Electrochemical Techniques / Q000379:methods*; D004784:Environmental Monitoring / Q000379:methods*; D008027:Light; D057230:Limit of Detection; D054802:Molecular Imprinting; D043942:Nanotubes / Q000737:chemistry / Q000648:ultrastructure; D055668:Photochemical Processes; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D045483:Rivers / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; C009495:titanium dioxide; C009828:2,4,5,2',5'-pentachlorobiphenyl; D014025:Titanium; D011078:Polychlorinated Biphenyls
keywords: Environmental monitoring; Molecular imprinting; PCB101 sensor; Selective photoelectrochemical detection; Single crystalline TiO(2) NRs