Details

Autor(en) / Beteiligte

• Cheng, Yahui
• Lin, Yuanjing
• Xu, Jianping
• He, Jie
• Wang, Tianzhao
• Yu, Guojun
• Shao, Dawei
• Wang, Wei-Hua
• Lu, Feng
• Li, Lan
• Du, Xiwen
• Wang, Weichao
• Liu, Hui
• Zheng, Rongkun

Titel

Surface plasmon resonance enhanced visible-light-driven photocatalytic activity in Cu nanoparticles covered Cu2O microspheres for degrading organic pollutants

Ist Teil von

• Applied surface science, 2016-03, Vol.366, p.120-128

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Cu NPs introduce the SPR and result in an increase of visible light absorption.•The photocatalytic activity of Cu2O/Cu improves greatly due to the SPR effect.•A dark catalytic activity is observed stemming from the Fenton-like reaction.•The •O2− and •OH radicals contribute to the photocatalytic process.•The •OH radicals contribute to the dark catalytic process. Micron-sized Cu2O with different coverage of Cu nanoparticles (NPs) on the sphere has been synthesized by a redox procedure. The absorption spectra show that Cu NPs induce the surface plasmon resonance (SPR) at the wavelength of ∼565nm. Methylene blue (MB) photodegrading experiments under visible-light display that the Cu2O–Cu–H2O2 system exhibits a superior photocatalytic activity to Cu2O–H2O2 or pure H2O2 with an evident dependency on Cu coverage. The maximum photodegradation rate is 88% after visible-light irradiating for 60min. The role of the Cu NPs is clarified through photodegradation experiments under 420nm light irradiation, which is different from the SPR wavelength of Cu NPs (∼565nm). By excluding the SPR effect, it proves that Cu SPR plays a key role in the photodegradation. Besides, a dark catalytic activity is observed stemming from the Fenton-like reaction with the aid of H2O2. The radical quenching experiments indicate that both •O2− and •OH radicals contribute to the photocatalysis, while the dark catalysis is only governed by the •OH radicals, leading to a lower activity comparing with the photocatalysis. Therefore, with introducing Cu NPs and H2O2, the Cu2O-based photocatalytic activity could be significantly improved due to the SPR effect and dark catalysis.