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Hydroxyl radical ESR spectra of Pd/TNTs nanocomposites (1 wt% of Pd), pure Pd NPs, and pure TNTs formed in aqueous dispersions in a Pyrex vessel containing ∼20 mg sample after 5 min irradiation by visible light (filter: λ > 450). In the system, the concentration of DMPO is 0.4 mol L−1
