Nature of the Electron-Hole Pair in the System Anthracene Crystal/Rhodamine B Adsorbed from Aqueous Solution. Dependence of Kinetics and Spin-Dynamics on External Parameters. Part I: External Electric Field

1979 ◽  
Vol 83 (2) ◽  
pp. 130-139 ◽  
Author(s):  
N. Müller ◽  
G. Papier ◽  
K.-P. Charlé ◽  
F. Willig
Keyword(s):  
Aqueous Solution ◽  
Electric Field ◽  
External Electric Field ◽  
Rhodamine B ◽  
Spin Dynamics ◽  
Hole Pair ◽  
Electron Hole ◽  
Electron Hole Pair ◽  
Anthracene Crystal

scholarly journals A Facile Synthesis of Visible-Light Driven Rod-on-Rod like α-FeOOH/α-AgVO3 Nanocomposite as Greatly Enhanced Photocatalyst for Degradation of Rhodamine B

Catalysts ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 392 ◽  
Author(s):  
Meng Sun ◽  
Raja Senthil ◽  
Junqing Pan ◽  
Sedahmed Osman ◽  
Abrar Khan
Keyword(s):  
Electron Microscopy ◽  
Visible Light ◽  
Rhodamine B ◽  
Diffuse Reflectance Spectroscopy ◽  
Hole Pair ◽  
Precipitation Method ◽  
Aqueous Environment ◽  
Electron Hole ◽  
X Ray ◽  
Electron Hole Pair

In this work, we have synthesized the rod-on-rod–like α-FeOOH/α-AgVO3 nanocomposite photocatalysts with the different amounts of solvothermally synthesized α-FeOOH nanorods via a simple co-precipitation method. The as-synthesized photocatalysts were characterized by X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) spectroscopy, UV−Visible diffuse reflectance spectroscopy, scanning electron microscopy (SEM), element mapping, high-resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS) analysis. The observed SEM images show that both α-AgVO3 and α-FeOOH exhibits the rod-shaped morphology with nano size. Furthermore, the photocatalytic activities of the obtained photocatalysts were evaluated towards the degradation of Rhodamine B (RhB) under visible-light irradiation. It is demonstrated that the 3 mg α-FeOOH added to the α-FeOOH/α-AgVO3 nanocomposite exhibited an enhanced photocatalytic performance as compared with the pure α-AgVO3 and α-FeOOH. This significant improvement can be attributed to the increased photo-excited electron-hole pair separation efficiency, large portion of visible-light absorption ability and the reduced recombination of the electron-hole pair. The recycling test revealed that the optimized nanocomposite exhibited good photostability and reusability properties. In addition, the believable photodegradation mechanism of RhB using α-FeOOH/α-AgVO3 nanocomposite is proposed. Hence, the developed α-FeOOH/α-AgVO3 nanocomposite is a promising material for the degradation of organic pollutants in an aqueous environment.

scholarly journals Azadirachta indica leaves extract assisted green synthesis of Ag-TiO2 for degradation of Methylene blue and Rhodamine B dyes in aqueous medium

2019 ◽  
Vol 8 (1) ◽  
pp. 659-666 ◽  
Author(s):  
Muhammad Saeed ◽  
Majid Muneer ◽  
Muhammad Kaleem Khan Khosa ◽  
Nadia Akram ◽  
Sheeba Khalid ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Azadirachta Indica ◽  
Rhodamine B ◽  
Textile Industry ◽  
Catalytic Efficiency ◽  
Fluid Phase ◽  
Hole Pair ◽  
Electron Hole ◽  
Degradation Of Dyes ◽  
Electron Hole Pair

Abstract Aqueous pollution due to textile industry is an important issue. Photocatalysis is one of the methods used for eradication of dyes from textile industrial effluents. In this study, the synthesis, characterization and evaluation of photo catalytic activity of Ag-TiO2 is reported. TiO2 catalysts with 2, 4, 6 and 8% loading of Ag were prepared by green methods using Azadirachta indica leaves extract as reducing agent with titanium dioxide and silver nitrate as precursor materials. Prepared catalyst was characterized by advanced techniques and was used as catalyst for degradation of Methylene blue and Rhodamine B dyes. Deposition of Ag greatly enhanced the catalytic efficiency of TiO2 towards degradation of dyes. Irradiation of catalyst excites electrons from conduction band of catalyst to valence band yielding an electron-hole pair. This electron-hole pair undergoes secondary reactions and produce OH∙ radicals. These active radicals take part in degradation of dyes. More than 90% dyes were degraded in 120 min. Photo catalytic degradation of Methylene blue and Rhodamine B followed Eley-Rideal mechanism which states that dye react in fluid phase with adsorbed oxygen.

scholarly journals Tunable electronic and optical properties of a BAs/As heterostructure by vertical strain and external electric field

RSC Advances ◽  
2021 ◽  
Vol 11 (35) ◽  
pp. 21824-21831
Author(s):  
X. Q. Deng ◽  
R. Q. Sheng ◽  
Q. Jing
Keyword(s):  
Optical Properties ◽  
Electric Field ◽  
External Electric Field ◽  
Photogenerated Electron ◽  
Electron Hole ◽  
Electronic And Optical Properties ◽  
Vertical Strain

The CBM (VBM) of the heterostructure is mainly contributed by the BAs (arsenene), which will favor the separation of photogenerated electron–hole pairs.

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
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