Nanoparticles for the Degradation of Water Pollutants
3.4 Conclusions
Gold particles have been used as surface modifiers because they possibly inhibit charge recombination by accelerating transfer of photoexcited electrons from titania to substrates. Another advantage of materials containing gold is their absorption to induce photocatalytic reactions under visible light irradiation [74]. Nevertheless, the results obtained for the Au photocatalysts suggest the existence of different activation mechanisms depending on the type of carbon material and on the irradiation wavelength used [75].
photocatalytic reactions under visible light irradiation. Nevertheless, the results obtained for the Au photocatalysts suggest the existence of different activation mechanisms depending on the type of carbon material and on the irradiation wavelength used. Moreover, the gold nanoparticle size has no influence in the catalytic activity, since the sample with the largest size (Au/GO–TiO2, 23.7 nm) is the most active, but the trend is not followed when the other samples are compared.
Acknowledgements
Financial support for this work was provided by FCT/MEC and FEDER under Programme PT2020 (Project UID/EQU/50020/2013), NORTE-07–
0162-FEDER-000050 and NORTE-07–0124-FEDER-000015 co-financed by FEDER through ON2 and QREN. LMPM, SACC and AMTS acknowledge Investigador FCT (IF/01248/2014, IF/01381/2013/CP1160/CT0007 and IF/01501/2013, respectively), with financing from the European Social Fund and the Human Potential Operational Program. Authors are thankful to Dr Carlos M. Sá (CEMUP) for assistance with SEM analyses.
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