scholarly journals Dynamics of Ion Pairing in Dilute Aqueous HCl Solutions by Spectroscopic Measurements of Hydroxyl Radical Conversion into Dichloride Radical Anions

2021 ◽  
Author(s):  
Lukasz Kazmierczak ◽  
Ireneusz Janik ◽  
Marian Wolszczak ◽  
Dorota Swiatla-Wojcik
Keyword(s):  
Hydroxyl Radical ◽  
Ion Pairing ◽  
Radical Anions ◽  
Spectroscopic Measurements ◽  
Radical Conversion

scholarly journals Treatment of Trichloroethylene with Photocatalyst-Coated Optical Fiber

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2391 ◽  
Author(s):  
Chen ◽  
Wu ◽  
Hsieh ◽  
Chen
Keyword(s):  
Light Intensity ◽  
Optical Fiber ◽  
Hydroxyl Radical ◽  
Diffuse Reflectance Spectroscopy ◽  
Degradation Efficiency ◽  
Basic Solution ◽  
Low Light ◽  
Chlorobenzoic Acid ◽  
Light Emitting ◽  
Radical Conversion

In this present study, we investigated the effect of photocatalyzation on the degradation of trichloroethylene (TCE) in the aqueous phase by a photocatalyst-coated plastic optical fiber (POF). Two light-emitting diodes (LEDs) with low light intensity were used as the light source and TiO2 and ZnO were used as photocatalysts, which were characterized by scanning electron microscope (SEM) and UV-Vis diffuse reflectance spectroscopy (DRS). The para-chlorobenzoic acid (pCBA) was used as the hydroxyl radical probe for kinetic study and for the calculation of hydroxyl radical conversion rate (ROH,UV ). Experimental results show that POF coated with TiO2 exhibited higher degradation efficiency of TCE in basic solution, but POF coated with ZnO performed better in acidic solution. The increase of coating times resulted in the decrease in degradation efficiency of TCE due to increased thickness of the photocatalyst layer. The enhancement of light intensity contributed to the improvement of photocatalytic treatment efficiency. The ROH,UV for TiO2 and ZnO coated POF increased from 2 × 103 to 8 × 103 M s cm2 mJ−1 and from 8 × 102 to 2 × 103 M s cm2 mJ−1, respectively, as the pH increased from 4 to 10.

Elektronentransfer und Ionenpaar-Bildung, 7 [1, 2] Kontakt-Ionenpaare Schwefel enthaltender Radikalanionen / Electron Transfer and Ion Pairing, 7 [1, 2] Contact Ion Pairs of Sulfur-Containing Radical Anions

1988 ◽  
Vol 43 (10) ◽  
pp. 1240-1246 ◽  
Author(s):  
Hans Bock ◽  
Peter Hänel ◽  
H.-F Herrmann ◽  
Heindirk torn Dieck
Keyword(s):  
Electron Transfer ◽  
Ion Pairs ◽  
Ion Pairing ◽  
Radical Anions ◽  
Contact Ion Pairs ◽  
Sulfur Containing

The structurally different radical anions M⊖ of peralkylated 1-sila-2,5-diazacyclopentane-3,4-dithione and of tetrakis(isopropylthio)-p-benzoquinone are generated by reduction with potassium/2.2.2-cryptand under aprotic conditions in THF solution. On addition of Li⊕B(C6H5)4⊖, both form hitherto elusive sulfur-containing contact ion pairs, which are characterized by their ESR/ENDOR spectra.

Cyclic In-Plane Electron Delocalization (σ-Bishomoaromaticity) in 4N/5e Radical Anions and 4N/6e DianionsGeneration, Structures, Properties, Ion-Pairing, and Calculations

2000 ◽  
Vol 122 (43) ◽  
pp. 10650-10660 ◽  
Author(s):  
Kai Exner ◽  
Oliver Cullmann ◽  
Markus Vögtle ◽  
Horst Prinzbach ◽  
Birgit Grossmann ◽  
...  
Keyword(s):  
Ion Pairing ◽  
Electron Delocalization ◽  
Radical Anions
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