biostudies-literatureHai ZNIMHD NIH HHS10829-10835https://www.ebi.ac.uk/biostudies/studies/S-EPMC4892124biostudies-literatureUnknown1(36)Au, Cu and bimetallic Au-Cu nanoparticles were synthesized on the surface of commercial TiO₂ compounds (P25) by reduction of the metal precursors with tetrakis (hydroxymethyl) phosphonium chloride (THPC) (0.5 % in weight). The alloyed structure of Au-Cu NPs was confirmed by HAADF-STEM, EDS, HRTEM and XPS techniques. The photocatalytic properties of the modified TiO₂ have been studied for phenol photodegradation in aqueous suspensions under UV-visible irradiation. The modification by the metal nanoparticles induces an increase in the photocatalytic activity. The highest photocatalytic activity is obtained with Au-Cu/TiO₂ (Au/Cu 1:3). Their electronic properties have been studied by time resolved microwave conductivity (TRMC) to follow the charge-carrier dynamics. TRMC measurements show that the TiO₂ modification with Au, Cu and Au-Cu nanoparticles plays a role in charge-carrier separations increasing the activity under UV-light. Indeed, the metal nanoparticles act as a sink for electron, decreasing the charge carrier recombination. The TRMC measurements show also that the bimetallic Au-Cu nanoparticles are more efficient in electron scavenging than the monometallic Au and Cu ones.Journal of materials chemistry. AModification of TiO₂ by Bimetallic Au-Cu Nanoparticles for Wastewater Treatment.PMC4892124G12 MD007591Etcheberry AUribe DBChen JRemita HVigneron JBeaunier PSorgues SKolli NEColbeau-Justin CJose-Yacaman MHai ZfalseModification of TiO₂ by Bimetallic Au-Cu Nanoparticles for Wastewater Treatment.Au, Cu and bimetallic Au-Cu nanoparticles were synthesized on the surface of commercial TiO₂ compounds (P25) by reduction of the metal precursors with tetrakis (hydroxymethyl) phosphonium chloride (THPC) (0.5 % in weight). The alloyed structure of Au-Cu NPs was confirmed by HAADF-STEM, EDS, HRTEM and XPS techniques. The photocatalytic properties of the modified TiO₂ have been studied for phenol photodegradation in aqueous suspensions under UV-visible irradiation. The modification by the metal nanoparticles induces an increase in the photocatalytic activity. The highest photocatalytic activity is obtained with Au-Cu/TiO₂ (Au/Cu 1:3). Their electronic properties have been studied by time resolved microwave conductivity (TRMC) to follow the charge-carrier dynamics. TRMC measurements show that the TiO₂ modification with Au, Cu and Au-Cu nanoparticles plays a role in charge-carrier separations increasing the activity under UV-light. Indeed, the metal nanoparticles act as a sink for electron, decreasing the charge carrier recombination. The TRMC measurements show also that the bimetallic Au-Cu nanoparticles are more efficient in electron scavenging than the monometallic Au and Cu ones.2013-01-01T00:00:00Z2013 Sep2025-04-04T02:42:56.679Z2019-03-27T02:15:15ZS-EPMC48921242727484410.1039/C3TA11684K10.1039/c3ta11684k