Photochem Photobiol 2018 07 17;94(4):641-649. Epub 2018 Apr 17.
Department of Chemistry, Indian Institute of Technology, Banaras Hindu University, Varanasi, India.
Curcumin-functionalized Ag/Ag O (c-Ag/Ag O) nanocomposites with varying proportions of curcumin and Ag/Ag O were prepared by a simple one pot green synthesis protocol in aqueous medium. The plasmonic band undergoes slight redshift, broadening and decrease in intensity with increase in the proportion of Ag O formed. These composite nanoparticles were found to be efficient visible-light photocatalysts for aerobic oxidation of methyl orange and rhodamine B (RhB). Functionalization by curcumin significantly enhanced the photocatalytic activity with good reusability. The photocatalytic oxidation rate showed super linear increase with light intensity because of localized surface plasmon resonance (LSPR)-induced strong near field. The trapping experiments confirmed that superoxide radicals were the main active species responsible for the degradation reaction. A plasmonic Z-scheme photocatalytic mechanism is proposed to explain the possible charge transfer and separation behavior of electron-hole pairs among Ag, Ag O and curcumin under visible-light irradiation.