Efficient Mineralization of Organic Pollutants Using Visible-light-induced PTCDA Anions Electronic Reservoir and Photogenerated Holes

2021 ◽  
Author(s):  
Yan Guo ◽  
Qixin Zhou ◽  
Jun Nan ◽  
Yongfa Zhu
Keyword(s):  
Visible Light ◽  
Organic Pollutants ◽  
Advanced Oxidation Processes ◽  
Degradation Rate ◽  
Organic Molecules ◽  
Flow Reactor ◽  
Oxygen Species ◽  
Continuous Flow Reactor ◽  
Light Excitation ◽  
Visible Light Degradation

Abstract Introducing the anion intermediate found with PTCDA into advanced oxidation processes (AOPs) overcomes the limitation of visible-light degradation. Stabilized PTCDA anionic intermediates act as electron reservoir to activate PMS to generate reactive oxygen species, thus improving the degradation rate of organic pollutants driven by visible light. At the same time, the photogenerated holes of PDI induce α and β scission with the unshared electron in organic molecules, and realize the deep mineralization of converting organic molecules to CO2. The BPA degradation rate of PTCDA /PMS is over 125.8 and 2.8 times as high as PTCDA photocatalysis and Co3O4/PMS, respectively. The BPA mineralization of PTCDA /PMS reaching ~ 88% outclasses Co3O4/PMS (~ 25%). In continuous flow reactor, it has a ~ 100% degradation and ~ 80% mineralization of BPA. The outstanding degradation in real water under solar light excitation indicates that PTCDA/PMS would be an intriguing system for non-toxic and harmless elimination of organic pollutants.

Zwitterionic buffer-induced visible light excitation of TiO2 for efficient pollutant photodegradation

RSC Advances ◽  
2016 ◽  
Vol 6 (42) ◽  
pp. 35449-35454 ◽  
Author(s):  
Xiang Xiao ◽  
Wen-Wen Zhu ◽  
Yu-Bin Lei ◽  
Qiu-Yue Liu ◽  
Qian Li ◽  
...  
Keyword(s):  
Visible Light ◽  
Light Absorption ◽  
Organic Molecules ◽  
Surface Complexation ◽  
Environmentally Benign ◽  
Visible Light Absorption ◽  
Photocatalytic Application ◽  
Light Excitation ◽  
Zwitterionic Buffer

TiO2 surface complexation with antenna organic molecules confers it a visible light absorption ability that favors ​photocatalytic application, but environmentally benign antenna molecules are yet to be developed.

Synthesis of NdFeO3 Perovskites in a Reverse Microemulsion and its Visible Light Photocatalytic Activity

2011 ◽  
Vol 282-283 ◽  
pp. 593-596 ◽  
Author(s):  
Ying Juan Hao ◽  
Bo Li ◽  
Rui Hong Liu ◽  
Fa Tang Li
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Degradation Rate ◽  
Irradiation Time ◽  
Photocatalytic Property ◽  
Reverse Microemulsion ◽  
Xrd Pattern ◽  
Degradation Reaction ◽  
Visible Light Degradation ◽  
Visible Light Photocatalytic

The synthesis of NdFeO3 perovskites in a reverse microemulsion and its photocatalytic property for visible light degradation reaction of methylene blue were investigated, respectively. When the irradiation time prolonged from o to 90 minutes, the degradation rate for methylene blue could achieve 60%. XRD pattern shows that a well-crystallized perovskite structure is observed for the NdFeO3 sampled prepared. The TEM characterization result indicates that the dimension of NdFeO3 nanopowders is in the range of 35~45 nm, which is consistent with the calculation result using the Scherrer equation.

scholarly journals Photocatalysis Using Semiconductor Nanoclusters

1998 ◽  
Vol 549 ◽  
Author(s):  
J.P. Wilcoxon ◽  
T.R. Thurston
Keyword(s):  
Energy Source ◽  
Liquid Chromatography ◽  
Visible Light ◽  
Valence Band ◽  
Conduction Band ◽  
Organic Pollutants ◽  
Organic Molecules ◽  
Redox Potentials ◽  
Reaction Products ◽  
Positive Valence

AbstractWe report on experiments using nanosize MoS2 to photo-oxidize organic pollutants in water using visible light as the energy source. We have demonstrated that we can vary the redox potentials and absorbance characteristics of these small semiconductors by adjusting their size, and our studies of the photooxidation of organic molecules have revealed that the rate of oxidation increases with increasing bandgap (i.e. more positive valence band and more negative conduction band potentials). Because these photocatalysis reactions can be performed with the nanoclusters fully dispersed and stable in solution, liquid chromatography can be used to determine both the intermediate reaction products and the state of the nanoclusters during the reaction. We have demonstrated that the MoS2 nanoclusters remain unchanged during the photooxidation process by this technique. We also report on studies of MoS2 nanoclusters deposited on TiO2 powder.

Visible light-enabled selective depolymerization of oxidized lignin by an organic photocatalyst

2020 ◽  
Vol 56 (76) ◽  
pp. 11243-11246
Author(s):  
Shuyuan Li ◽  
Zhongkai Hao ◽  
Kaixuan Wang ◽  
Min Tong ◽  
Yanan Yang ◽  
...  
Keyword(s):  
Visible Light ◽  
Continuous Flow ◽  
Flow Reactor ◽  
Perylene Diimide ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Efficient Strategy ◽  
Continuous Flow Reactor ◽  
Organosolv Lignin ◽  
Lignin Model

A novel and efficient strategy for the selective depolymerization of lignin model compounds and organosolv lignin via a visible-light-induced photocatalytic continuous-flow reactor was first developed by using perylene diimide (PDI) as a organocatalyst.

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