Abstract

CdS nanowires doped with different contents of Eu dopant were synthesized by solvothermal method. XRD, SEM, TEM and Raman analyses certified that the as-synthesized samples were hexagonal CdS uniform nanowires. The pure CdS nanowires were 1–3 ​μm long and 80 ​nm diameter with the 1st and 2nd order longitudinal phonon modes at 298 and 594 ​cm−1. The 3% Eu-doped CdS wires were 800 ​nm–2.5 ​μm long and 75 ​nm diameter with the 1st and 2nd order longitudinal phonon modes at 296 and 593 ​cm−1. CdS nanowires grew along the [001] direction due to the surface energy effect. The photocatalytic properties of CdS and Eu-doped CdS nanowires were investigated for the degradation of rhodamine B (RhB) illuminated by visible radiation. In this research, Eu dopant played the role in promoting the photocatalytic kinetics because Eu3+ ions act as an electron acceptor to promote charge separation and photocatalytic activity. Both ●OH and ●O2− were the main active radicals used to transform RhB molecules into CO2, H2O and other intermediates.

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