Spectrally Coordinated Plasmonic–Photothermal Photocatalysts for Mineralization of Mixed Indoor VOCs Under White LED Illumination

ABSTRACT Indoor volatile organic compounds (VOCs) remain a major health concern, yet conventional photocatalysts show limited effectiveness under low‐intensity indoor lighting. Here, a spectrally coordinated plasmonic–photothermal–photocatalytic architecture integrating Cu(II)‐grafted TiO 2 (CuT), yolk–shell Au@SiO 2 (AuSi), and reduced graphene oxide sheets (GS) is presented for efficient mixed‐VOC mineralization under white light‐emitting diode (LED) illumination. Rather than acting as a simple multicomponent composite, this architecture couples partially overlapping but preferential spectral contributions across the LED spectrum: CuT drives visible‐light photocatalytic oxidation, AuSi contributes localized surface‐plasmon‐resonance‐induced electric‐field enhancement near CuT, and GS converts longer‐wavelength photons into localized heat to accelerate interfacial oxidation kinetics. Co…