scholarly journals On the theory of the reaction rate of vibrationally excited CO molecules with OH radicals

2006 ◽  
Vol 124 (2) ◽  
pp. 024306 ◽  
Author(s):  
Wei-Chen Chen ◽  
R. A. Marcus
Keyword(s):  
Reaction Rate ◽  
Oh Radicals ◽  
Vibrationally Excited

scholarly journals Reaction Rate Coefficient of OH Radicals with d9-Butanol as a Function of Temperature

ACS Omega ◽  
2021 ◽  
Author(s):  
Amira Allani ◽  
Yuri Bedjanian ◽  
Dimitrios K. Papanastasiou ◽  
Manolis N. Romanias
Keyword(s):  
Reaction Rate ◽  
Rate Coefficient ◽  
Oh Radicals ◽  
Reaction Rate Coefficient

Ultracold collisions and reactions of vibrationally excited OH radicals with oxygen atoms

2011 ◽  
Vol 13 (42) ◽  
pp. 19067 ◽  
Author(s):  
Juan Carlos Juanes-Marcos ◽  
Goulven Quéméner ◽  
Brian K. Kendrick ◽  
Naduvalath Balakrishnan
Keyword(s):  
Oh Radicals ◽  
Vibrationally Excited ◽  
Ultracold Collisions ◽  
Oxygen Atoms

Reaction Rate of Vibrationally Excited Hydroxyl with Ozone

1971 ◽  
Vol 10 (8) ◽  
pp. 1786 ◽  
Author(s):  
R. N. Coltharp ◽  
S. D. Worley ◽  
A. E. Potter
Keyword(s):  
Reaction Rate ◽  
Vibrationally Excited

AN IMPROVED TECHNIQUE FOR THE OBSERVATION OF INFRARED CHEMILUMINESCENCE: RESOLVED INFRARED EMISSION OF OH ARISING FROM THE SYSTEM H + O2

1960 ◽  
Vol 38 (10) ◽  
pp. 1742-1755 ◽  
Author(s):  
P. E. Charters ◽  
J. C. Polanyi
Keyword(s):  
Infrared Spectrum ◽  
Electronic State ◽  
Vibrational Temperature ◽  
Infrared Emission ◽  
Multiple Reflection ◽  
Ground Electronic State ◽  
Oh Radicals ◽  
Vibrationally Excited ◽  
Improved Technique ◽  
First Time

A multiple reflection apparatus for the observation of infrared chemiluminescence is described. By means of this apparatus infrared emission from the system H + O2 has been identified as being due to vibrationally excited OH radicals in levels v = 1, 2, and 3 of the ground electronic state. The resolved infrared spectrum of the OH fundamental has been observed for the first time without interference from other emission. The most likely source of excited OH is the reaction H + HO2 → OH† + OH. The vibrational 'temperature' of OH† (vibrationally excited OH in its ground electronic state) in our system is in the region of TV = 2240 °K. These findings are discussed in relation to Krassovsky's suggestion that reaction between H and O2 could account for the Meinel hydroxyl bands in the night sky.

scholarly journals Photocatalytic Performance of CuxO/TiO2 Deposited by HiPIMS on Polyester under Visible Light LEDs: Oxidants, Ions Effect, and Reactive Oxygen Species Investigation

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 412 ◽  
Author(s):  
Hichem Zeghioud ◽  
Aymen Assadi ◽  
Nabila Khellaf ◽  
Hayet Djelal ◽  
Abdeltif Amrane ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Magnetron Sputtering ◽  
Visible Light ◽  
Metallic Nanoparticles ◽  
Reaction Rate ◽  
Potassium Dichromate ◽  
Reactive Oxygen ◽  
Oh Radicals ◽  
Primary Role ◽  
Oxygen Species

In the present study, we propose a new photocatalytic interface prepared by high-power impulse magnetron sputtering (HiPIMS), and investigated for the degradation of Reactive Green 12 (RG12) as target contaminant under visible light light-emitting diodes (LEDs) illumination. The CuxO/TiO2 nanoparticulate photocatalyst was sequentially sputtered on polyester (PES). The photocatalyst formulation was optimized by investigating the effect of different parameters such as the sputtering time of CuxO, the applied current, and the deposition mode (direct current magnetron sputtering, DCMS or HiPIMS). The results showed that the fastest RG12 degradation was obtained on CuxO/TiO2 sample prepared at 40 A in HiPIMS mode. The better discoloration efficiency of 53.4% within 360 min was found in 4 mg/L of RG12 initial concentration and 0.05% Cuwt/PESwt as determined by X-ray fluorescence. All the prepared samples contained a TiO2 under-layer with 0.02% Tiwt/PESwt. By transmission electron microscopy (TEM), both layers were seen uniformly distributed on the PES fibers. The effect of the surface area to volume (dye volume) ratio (SA/V) on the photocatalytic efficiency was also investigated for the discoloration of 4 mg/L RG12. The effect of the presence of different chemicals (scavengers, oxidant or mineral pollution or salts) in the photocatalytic medium was studied. The optimization of the amount of added hydrogen peroxide (H2O2) and potassium persulfate (K2S2O8) was also investigated in detail. Both, H2O2 and K2S2O8 drastically affected the discoloration efficiency up to 7 and 6 times in reaction rate constants, respectively. Nevertheless, the presence of Cu (metallic nanoparticles) and NaCl salt inhibited the reaction rate of RG12 discoloration by about 4 and 2 times, respectively. Moreover, the systematic study of reactive oxygen species’ (ROS) contribution was also explored with the help of iso-propanol, methanol, and potassium dichromate as •OH radicals, holes (h+), and superoxide ion-scavengers, respectively. Scavenging results showed that O2− played a primary role in RG12 removal; however, •OH radicals’ and photo-generated holes’ (h+) contributions were minimal. The CuxO/TiO2 photocatalyst was found to have a good reusability and stability up to 21 cycles. Ions’ release was quantified by means of inductively coupled plasma mass spectrometry (ICP-MS) showing low Cu-ions’ release.

scholarly journals Optimization of TiO2-P25 photocatalyst dose and H2O2 concentration for advanced photooxidation using the smartphone-based colorimetry

2021 ◽  
Author(s):  
Nazarii Danyliuk ◽  
Tetiana Tatarchuk ◽  
Karthik Kannan ◽  
Alexander Shyichuk
Keyword(s):  
Reaction Rate ◽  
Wastewater Treatment Plants ◽  
Organic Pollutant ◽  
Side Reaction ◽  
Reaction Rate Constant ◽  
Oh Radicals ◽  
H2o2 Concentration ◽  
Reaction Rate Constants ◽  
Photodegradation Rate ◽  
Final Degree

Abstract Color images taken by a smartphone camera were used to estimate the rate of advanced photooxidation reaction of Direct Red 23 (DR23) azo dye as a model organic pollutant. The RGB color coordinates were tested to quantify the dye. Images of the reaction mixture were taken at specified intervals to obtain kinetic lines and reaction rate constants. Both the reaction rate constant and the final degree of degradation were plotted as functions of the photocatalyst dose and the concentration of H2O2. The smartphone measurements are fully consistent with the reference spectrophotometry data. The maximum degradation efficiency of the DR23 dye was recorded at C0(H2O2) = 2.5 mM and photocatalyst dose equal to 1.0 mg/L. Higher H2O2 concentrations reduce the degradation rate as a result of the side reaction of H2O2 with OH radicals. A two-factor experimental design was used to study the effects of photocatalyst dose and H2O2 concentration with 5 and 7 levels, respectively. The ANOVA results indicated that the concentration of H2O2 had the greater influence. The smartphone provides quick and easy measurement of the photodegradation rate directly in the solutions without sampling. The proposed approach can be applied under field conditions in wastewater treatment plants.

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