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Facile and Rapid Visualization of Colorless Endocrine Disruptor Bisphenol A by Interfacial Charge‐Transfer Transitions with TiO 2 Nanoparticles
Author(s) -
Fujisawa Junichi,
Matsumura Shingo,
Hanaya Minoru
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700590
Subject(s) - bisphenol a , endocrine disruptor , nanoparticle , visible spectrum , photochemistry , materials science , chemistry , anatase , chemical engineering , photocatalysis , organic chemistry , nanotechnology , endocrine system , catalysis , epoxy , optoelectronics , biochemistry , engineering , hormone
Bisphenol A (BPA) is an estrogen‐mimicking endocrine disruptor, which has been widely used in the production of polycarbonates and epoxy resins. Because BPA is a colorless material owing to the wide HOMO‐LUMO gap of ca. 4.3 eV, we cannot discern toxic BPA dissolved in solution with eyes. Here, we report a facile and rapid method for visible‐light sensing of BPA with TiO 2 nanoparticles. The chemical adsorption of BPA on anatase TiO 2 nanoparticles via the two phenol groups induces interfacial charge‐transfer (ICT) transitions from BPA to TiO 2 in the visible region. The ICT transitions give rise to visible‐light absorption up to ca. 600 nm, allowing visible‐light sensing of BPA. This method is also applicable to other phenol‐containing endocrine disruptors. More generally, to our best knowledge, this is the first demonstration for visible‐light sensing of colorless toxic organic compounds based on ICT transitions.