Mechanistic Insights into the Interface-Directed Transformation of Thiols into Disulfides and Molecular Hydrogen by Visible-Light Irradiation of Quantum Dots

2014 ◽  
Vol 126 (8) ◽  
pp. 2117-2121 ◽  
Author(s):  
Xu-Bing Li ◽  
Zhi-Jun Li ◽  
Yu-Ji Gao ◽  
Qing-Yuan Meng ◽  
Shan Yu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Molecular Hydrogen ◽  
Light Irradiation ◽  
Directed Transformation

scholarly journals Synthesis of Carbon Doped TiO2 Quantum Dots for Photocatalytic Sterilization under the Visible Light Irradiation and the Mechanisms

2019 ◽  
Vol 118 ◽  
pp. 01013 ◽  
Author(s):  
Wei Xiong ◽  
Altair T.F. Cheung ◽  
Michael K.H. Leung
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Superoxide Radical ◽  
Light Irradiation ◽  
Doping Amount ◽  
E Coli ◽  
Carbon Doped ◽  
Chemical States ◽  
Self Protection

In this article, the carbon doped TiO2 (C-TiO2) quantum dots (QDs) were prepared through the hydrothermal method and calcination. The size of the C-TiO2 QDs is about 5.7 nm. The doping amount of carbon can be tuned by adjusting the volumes of the carbon source, ethylene glycol added. The carbon atoms are proved to be doped into the interstitial sites of TiO2 lattice and induce the change of chemical states of Ti 2p and C 1s. The doping of carbon leads to the increasing photocatalytic sterilization of E. coli under the visible light irradiation. The survival rate of E. coli cells over C-TiO2 is only 1.5 % after 6 h. The reactive oxygen species (ROS), such as hydroxyl radical and superoxide radical, are considered as the primary factors for the photocatalytic sterilization. Due to oxidative stress of the attack by ROS, the enzyme activity per cells increases for self-protection during the photocatalytic sterilization.

Well dispersed MoC quantum dots in ultrathin carbon films as efficient co-catalysts for photocatalytic H2 evolution

2018 ◽  
Vol 6 (39) ◽  
pp. 18979-18986 ◽  
Author(s):  
Fan Gao ◽  
Yan Zhao ◽  
Lulu Zhang ◽  
Bo Wang ◽  
Yaozhu Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Carbon Films ◽  
Light Irradiation ◽  
Photocatalytic Reaction ◽  
H2 Evolution ◽  
Co Catalysts ◽  
Photocatalytic H2 Evolution

The proposed mechanism of photocatalytic reaction using a MoC-QDs/C/ZIS composite under visible light irradiation.

scholarly journals MOF-Derived Porous Fe2O3 Nanoparticles Coupled with CdS Quantum Dots for Degradation of Bisphenol A under Visible Light Irradiation

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1701 ◽  
Author(s):  
Ruowen Liang ◽  
Zhoujun He ◽  
Chen Zhou ◽  
Guiyang Yan ◽  
Ling Wu
Keyword(s):  
Quantum Dots ◽  
Bisphenol A ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
High Performance ◽  
Energy Levels ◽  
Light Irradiation ◽  
Cds Quantum Dots ◽  
Endocrine Disrupting Chemical ◽  
Cds Qds

In this work, CdS quantum dots (QDs) were planted on magnetically recyclable porous Fe2O3 (denoted as F450) to obtain CdS QDs/porous Fe2O3 hybrids (denoted as X–CdS/F450, in which X is the immersion times of CdS QDs). Porous Fe2O3 was first obtained by pyrolysis from an iron-containing metal–organic framework by a two-step calcination method. Next, CdS QDs (of average size 3.0 nm) were uniformly and closely attached to the porous F450 via a sequential chemical-bath deposition strategy. As expected, the X–CdS/F450 hybrids serve as high-performance photocatalysts for the degradation of bisphenol A, a typical endocrine-disrupting chemical. Almost ∼100% of the bisphenol A was degraded over 5-CdS/F450 after visible light irradiation for 30 min (λ ≥ 420 nm). In comparison, the degradation efficiency of pure F450 powder is 59.2%. The high performance of 5-CdS/F450 may be ascribable to the fast electron transport of porous F450, the intense visible-light absorption of the CdS QDs and the matched energy levels between CdS and F450. More significantly, through the photocatalytic degradation reaction, the X–CdS/F450 hybrids can easily be recovered magnetically and reused in subsequent cycles, indicating their stability and recyclability.

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