Cyclodextrin–gold nanocluster decorated TiO2 enhances photocatalytic decomposition of organic pollutants

2018 ◽  
Vol 6 (3) ◽  
pp. 1102-1108 ◽  
Author(s):  
Haiguang Zhu ◽  
Nirmal Goswami ◽  
Qiaofeng Yao ◽  
Tiankai Chen ◽  
Yanbiao Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Organic Pollutants ◽  
Gold Nanoclusters ◽  
Hole Pair ◽  
Photocatalytic Decomposition ◽  
Electron Hole ◽  
Gold Nanocluster ◽  
Electron Hole Pair

We decorated per-6-thio-β-cyclodextrin protected gold nanoclusters on TiO2 nanoparticles to improve photocatalytic activity by inhibiting electron–hole pair recombination and absorbing organic targets via host–guest interactions.

scholarly journals Photoelectrochemical and theoretical investigation of the photocatalytic activity of TiO2 : N

RSC Advances ◽  
2016 ◽  
Vol 6 (92) ◽  
pp. 89687-89698 ◽  
Author(s):  
Gabriela Byzynski Soares ◽  
Renan Augusto Pontes Ribeiro ◽  
Sergio Ricardo de Lazaro ◽  
Caue Ribeiro
Keyword(s):  
Photocatalytic Activity ◽  
Band Gap ◽  
Effective Mass ◽  
Theoretical Investigation ◽  
Hole Pair ◽  
Electron Hole ◽  
Electron Hole Pair ◽  
N Doping ◽  
Hole Recombination

In N-doping on TiO2 nanomaterial occurs a big decrease of band-gap (1 eV); however, its photocatalysis is low. We clarify such fact from effective mass, i.e., the electron–hole recombination is more than creation of electron–hole pair.

Preparation and Characterization of Ag/TiO2-xNx Nanoparticles

2007 ◽  
Vol 534-536 ◽  
pp. 105-108
Author(s):  
Zhong Qing Liu ◽  
Zheng Hua Li ◽  
Yan Ping Zhou ◽  
Chang Chun Ge
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Ultraviolet Light ◽  
Hole Pair ◽  
Electron Hole ◽  
Photoexcited Electron ◽  
Photochemical Deposition ◽  
Electron Hole Pair

The Ag/TiO2-xNx nanoparticles were synthesized by photochemical deposition with irradiation of visible light in a TiO2-XNX suspension system. The prepared products were characterized by means of XRD, Uv-vis, and FEM. Its photocatalytic activity was investigated by the decomposition of methylene blue (MB) solution under illumination of visible and ultraviolet light, respectively. Compared to TiO2-xNx, the photocatalytic activity of as–prepared Ag/TiO2-xNx is obviously enhanced due to the decreasing recombination of a photoexcited electron-hole pair. The mechanism in which photocatalytic activity is enhanced is discussed in detail.

Synthesis and Photocatalytic Degradation Performance of g-C3N4/ CQDs/SAPO-5 Ternary Composite

2018 ◽  
Vol 768 ◽  
pp. 201-205 ◽  
Author(s):  
Ling Fang Qiu ◽  
Zhi Wei Zhou ◽  
Xiao Bin Qiu ◽  
Shu Wang Duo
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Recombination Rate ◽  
Load Ratio ◽  
Carbon Quantum Dots ◽  
Hole Pair ◽  
Electron Hole ◽  
Ternary Composite ◽  
Electron Hole Pair ◽  
Ft Ir

Due to the fatal drawback of fast photoreduced electron-hole pair recombination rate of g-C3N4, g-C3N4/CQDs/SAPO-5 ternary composite were prepared. Both of carbon quantum dots and SAPO-5 can form heterojunction with g-C3N4to inhibit the recombination. Their properties were characterized by XRD, SEM, FT-IR, DRS and PL. Data of PL shows a much lower photoreduced electron-hole pair recombination rate of g-C3N4/CQDs/SAPO-5. The effect of CQDs amount loaded on ternary composite on the RhB photodegradation performance under visible light was discussed in detail. The observed RhB degradation performances indicate that the order of photocatalytic activity is: g-C3N4/CQDs/SAPO-5> g-C3N4/ SAPO-5 > g-C3N4. g-C3N4/CQDs/SAPO-5 with CQDs load ratio of 0.25 w.t.% shows the best photodegradation performance. The highest efficiency is about 24.43% higher than g-C3N4/ SAPO-5 and 47.15% higher than pristine g-C3N4, respectively. This work is promising for developing novel g-C3N4-based photocatalysts for environmental purification.

Observation of the effect of DAP separation on electron-hole pair ODMR signals in GaS

1982 ◽  
Vol 44 (4) ◽  
pp. 459-464 ◽  
Author(s):  
N. Killoran ◽  
B.C. Cavenett ◽  
F. Levy
Keyword(s):  
Hole Pair ◽  
Electron Hole ◽  
Electron Hole Pair

scholarly journals Direct Observation of Entropy-Driven Electron-Hole Pair Separation at an Organic Semiconductor Interface

2015 ◽  
Vol 114 (24) ◽  
Author(s):  
Nicholas R. Monahan ◽  
Kristopher W. Williams ◽  
Bharat Kumar ◽  
Colin Nuckolls ◽  
X.-Y. Zhu
Keyword(s):  
Direct Observation ◽  
Organic Semiconductor ◽  
Hole Pair ◽  
Electron Hole ◽  
Semiconductor Interface ◽  
Pair Separation ◽  
Electron Hole Pair

Few-Layered MoS2 Nanostructures for Highly Efficient Visible Light Photocatalysis

NANO ◽  
2016 ◽  
Vol 11 (10) ◽  
pp. 1650114 ◽  
Author(s):  
Dan Li ◽  
Jianwei Li ◽  
Caiqin Han ◽  
Xinsheng Zhao ◽  
Haipeng Chu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Electrochemical Impedance ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
Electrochemical Impedance Spectra ◽  
X Ray ◽  
Transmission Electron ◽  
Electron Hole Pair

Few-layered MoS2 nanostructures were successfully synthesized by a simple hydrothermal method without the addition of any catalysts or surfactants. Their morphology, structure and photocatalytic activity were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, electrochemical impedance spectra and UV-Vis absorption spectroscopy, respectively. These results show that the MoS2 nanostructures synthesized at 180[Formula: see text]C exhibit an optimal visible light photocatalytic activity (99%) in the degradation of Rhodamine B owing to the relatively easier adsorption of pollutants, higher visible light absorption and lower electron–hole pair recombination.

Electron-hole pair generation energy in gallium arsenide byxand γ photons

2002 ◽  
Vol 92 (3) ◽  
pp. 1248-1255 ◽  
Author(s):  
Giuseppe Bertuccio ◽  
Diego Maiocchi
Keyword(s):  
Gallium Arsenide ◽  
Hole Pair ◽  
Electron Hole ◽  
Electron Hole Pair ◽  
Pair Generation
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