Details

Autor(en) / Beteiligte

• Yang, Huaming
• Ouyang, Jing
• Tang, Aidong
• Xiao, Yu
• Li, Xianwei
• Dong, Xiaodan
• Yu, Yongmei

Titel

Electrochemical synthesis and photocatalytic property of cuprous oxide nanoparticles

Ist Teil von

• Materials research bulletin, 2006-07, Vol.41 (7), p.1310-1318

Ort / Verlag

United States: Elsevier Ltd

Erscheinungsjahr

2006

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Cuprous oxide (Cu2O) nanoparticles of 35nm in crystal size have been successfully synthesized via electrochemical method in alkali NaCl solutions with copper as electrodes and K2Cr2O7 as additive. Photocatalytic degradation of methyl orange (MeO) in aqueous Cu2O solution was investigated under either ultraviolet (UV) light or sunlight. X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transformation infrared spectroscopy (FT-IR), ultraviolet–visible spectroscopy (UV–vis) and X-ray photoelectron spectroscopy (XPS) were introduced to characterize the samples. The results indicate that electric current shows no obvious effect on the growth of Cu2O nanocrystals and that 97% of MeO can be decolorized under UV irradiation for 2h or under sunlight for 3h when amount of Cu2O is 2g/L. Recycling use of the catalyst revealed that Cu2O still has a high photocatalytic efficiency when repeatedly used for four times. Cu2O nanoparticles still kept its cubic crystal phase, but fractionally oxidized to be CuO after the photocatalysis. Compared with the original Cu2O nanoparticles, there has 1eV shift of Cu 2p electron and 1.6eV shift of Cu Auger signals for the Cu2O powders after four times photocatalysis. Some new peaks can also be observed at 401.1, 237.4 and 170.2eV in the Cu2O powders after photocatalysis.