Ag NPs decorated with betalamic acid was prepared as described above. In the case of sample without linker, the set involving adding 4-aminobenzoic acid was replaced by simply adding an equivalent amount of pure water. Finally, methylene blue (1.3 × 10−5 M) and 1 drop of trifluoracetic acid were added to the reaction mixture. A schematic representation of the photocatalytic reactor is presented in Fig. S1. A 405 nm CW laser was used to excite selectively the Ag NPs LSP and the gaseous products were extracted via a carrier gas (argon) and analyzed in flow mode with a QMS (quadrupole mass-spectrometer), while methylene blue depletion and emission from the sample was monitored by UV-Vis spectroscopy in batch mode.
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