Biomimetic Confined Assembly of Plasmonic CuS from Electronic Waste for Rapid Photothermal Disinfection.

Abstract

Photothermal disinfection (PTD) offers promising potential for water purification due to its sustainable and broad-spectrum bactericidal properties, although it is hindered by slow charge separation in photosensitizers. Herein, we present a plasma-mediated PTD technique utilizing an efficient localized heating effect induced by incident light at specific wavelengths for rapid bacterial inactivation. A metallic CuS photosensitizer, derived from electronic waste through a biomimetic transmembrane confined-assembled strategy, facilitates collective and coherent oscillation of free electrons around Cu atoms in the near-infrared range. The resulting plasmon resonance effect generates abundant high-energy hot carriers, further enhancing the separation efficiency of carriers generated by plasmon-induced intrinsic excitation. The nonradiative dissipation of these carriers triggers a significant localized heating effect in water matrices, leading to comprehensive PTD performance against <i>E. coli</i> and <i>B. subtilis</i>. This study highlights the role of the plasmonic heating effect from waste-derived photosensitizers in enhancing PTD performance, inspiring the development of advanced water disinfection technologies.