TY - JOUR
T1 - Surface plasmon resonance enhanced visible-light-driven photocatalytic activity in Cu nanoparticles covered Cu 2 O microspheres for degrading organic pollutants
AU - Cheng, Yahui
AU - Lin, Yuanjing
AU - Xu, Jianping
AU - He, Jie
AU - Wang, Tianzhao
AU - Yu, Guojun
AU - Shao, Dawei
AU - Wang, Wei Hua
AU - Lu, Feng
AU - Li, Lan
AU - Du, Xiwen
AU - Wang, Weichao
AU - Liu, Hui
AU - Zheng, Rongkun
N1 - Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.
PY - 2016/3/15
Y1 - 2016/3/15
N2 - Micron-sized Cu 2 O 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 ∼565 nm. Methylene blue (MB) photodegrading experiments under visible-light display that the Cu 2 O-Cu-H 2 O 2 system exhibits a superior photocatalytic activity to Cu 2 O-H 2 O 2 or pure H 2 O 2 with an evident dependency on Cu coverage. The maximum photodegradation rate is 88% after visible-light irradiating for 60 min. The role of the Cu NPs is clarified through photodegradation experiments under 420 nm light irradiation, which is different from the SPR wavelength of Cu NPs (∼565 nm). 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 H 2 O 2 . The radical quenching experiments indicate that both •O 2 - 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 H 2 O 2 , the Cu 2 O-based photocatalytic activity could be significantly improved due to the SPR effect and dark catalysis.
AB - Micron-sized Cu 2 O 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 ∼565 nm. Methylene blue (MB) photodegrading experiments under visible-light display that the Cu 2 O-Cu-H 2 O 2 system exhibits a superior photocatalytic activity to Cu 2 O-H 2 O 2 or pure H 2 O 2 with an evident dependency on Cu coverage. The maximum photodegradation rate is 88% after visible-light irradiating for 60 min. The role of the Cu NPs is clarified through photodegradation experiments under 420 nm light irradiation, which is different from the SPR wavelength of Cu NPs (∼565 nm). 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 H 2 O 2 . The radical quenching experiments indicate that both •O 2 - 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 H 2 O 2 , the Cu 2 O-based photocatalytic activity could be significantly improved due to the SPR effect and dark catalysis.
KW - Cu O
KW - Photocatalysis
KW - Surface plasmon resonance
KW - Visible-light-driven
UR - http://www.scopus.com/inward/record.url?scp=84960111470&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2015.12.238
DO - 10.1016/j.apsusc.2015.12.238
M3 - Article
AN - SCOPUS:84960111470
SN - 0169-4332
VL - 366
SP - 120
EP - 128
JO - Applied Surface Science
JF - Applied Surface Science
ER -