Chlorinated Ethene Degradation Rate Coefficients Simulated with Intact Sandstone Core Microcosms

2020 ◽  
Vol 54 (24) ◽  
pp. 15829-15839
Author(s):  
Rong Yu ◽  
Lawrence C. Murdoch ◽  
Ronald W. Falta ◽  
Richard G. Andrachek ◽  
Amanda A. Pierce ◽  
...  
Keyword(s):  
Degradation Rate ◽  
Rate Coefficients ◽  
Chlorinated Ethene

Degradation of Ametryn in Aqueous Solution by Solar/ S-Doped Titanium Dioxide Process

2010 ◽  
Vol 113-116 ◽  
pp. 1375-1378 ◽  
Author(s):  
Cheng Liu ◽  
Wei Chen
Keyword(s):  
Removal Efficiency ◽  
Degradation Rate ◽  
Solar Irradiation ◽  
Rate Coefficients ◽  
Sulfur Source ◽  
Doped Tio2 ◽  
Photo Catalyst ◽  
Hydrolysis Method ◽  
Water Ph ◽  
Acid Catalyzed

The removal efficiency of ametryn in water and the influencing factors by the combined process of solar irradiation and S-doped TiO2 were studied in detail, in which S-doped TiO2 photo-catalyst with high sunlight activity was prepared by acid catalyzed hydrolysis method with thiourea as sulfur source; As a comparison, solar/TiO2 process was studied in the meantime; The experiment results showed that ametryn could be more effectively oxidized by the solar/S-doped TiO2 process than the solar/ TiO2 one, while the removal efficiency of 60% and 40% respectively after 30 min’s irradiation; Pseudo-first-order model could be used to simulate the oxidation process in which the degradation rate coefficients were independent of the initial concentration of ametryn; Degradation rate could be greatly affected by the concentration of H2O2, the optimum concentration for the system of solar/S-doped TiO2 was found to be 20mg/L, which was 5mg/L higher than that of solar/TiO2 system; Lower water pH favored the degradation of ametryn for the change of charge density of both the ametryn molecular and photo-catalyst surface.

A New AID for Interpolating and Assessing Collision Strengths and Rate Coefficients

1988 ◽  
Vol 102 ◽  
pp. 107-110
Author(s):  
A. Burgess ◽  
H.E. Mason ◽  
J.A. Tully
Keyword(s):  
Significant Loss ◽  
Impact Excitation ◽  
Rate Coefficients ◽  
Electron Impact Excitation ◽  
Graphical Display ◽  
Practical Procedure ◽  
Positive Ions ◽  
Allowed Transition ◽  
Computational Errors ◽  
Existing Data

AbstractA new way of critically assessing and compacting data for electron impact excitation of positive ions is proposed. This method allows one (i) to detect possible printing and computational errors in the published tables, (ii) to interpolate and extrapolate the existing data as a function of energy or temperature, and (iii) to simplify considerably the storage and transfer of data without significant loss of information. Theoretical or experimental collision strengths Ω(E) are scaled and then plotted as functions of the colliding electron energy, the entire range of which is conveniently mapped onto the interval (0,1). For a given transition the scaled Ω can be accurately represented - usually to within a fraction of a percent - by a 5 point least squares spline. Further details are given in (2). Similar techniques enable thermally averaged collision strengths upsilon (T) to be obtained at arbitrary temperatures in the interval 0 < T < ∞. Application of the method is possible by means of an interactive program with graphical display (2). To illustrate this practical procedure we use the program to treat Ω for the optically allowed transition 2s → 2p in ArXVI.

Quantification of the export of cytokinins from roots to shoots of Rosa hybrida and their degradation rate in the shoot

1997 ◽  
Vol 101 (2) ◽  
pp. 347-352 ◽  
Author(s):  
Janneke A. Dieleman ◽  
Francel W. A. Verstappen ◽  
Rene R. J. Perik ◽  
Daan Kuiper
Keyword(s):  
Degradation Rate ◽  
Rosa Hybrida

Electron impact excitation of Al XIII : Collision strengths and rate coefficients

2001 ◽  
Vol 11 (PR2) ◽  
pp. Pr2-309-Pr2-312
Author(s):  
K. M. Aggarwal ◽  
F. P. Keenan ◽  
S. J. Rose
Keyword(s):  
Electron Impact ◽  
Impact Excitation ◽  
Rate Coefficients ◽  
Electron Impact Excitation

THE IONIZATION RATE COEFFICIENTS FOR SOME RADIATIVELY EXCITED RUBIDIUM STATES

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-87-C7-88
Author(s):  
A. N. Klucharev ◽  
A. V. Lazarenko ◽  
V. Vujnovic
Keyword(s):  
Ionization Rate ◽  
Rate Coefficients

Photo-catalytic degradation of gaseous pollutants in paper mills of southern China

TAPPI Journal ◽  
2018 ◽  
Vol 17 (03) ◽  
pp. 167-178 ◽  
Author(s):  
Xin Tong ◽  
Jiao Li ◽  
Jun Ma ◽  
Xiaoquan Chen ◽  
Wenhao Shen
Keyword(s):  
Degradation Rate ◽  
Southern China ◽  
Catalytic Degradation ◽  
Pulp And Paper ◽  
Gaseous Pollutants ◽  
Pulp And Paper Mills ◽  
Paper Mills ◽  
Initial Concentration ◽  
First Order ◽  
First Order Kinetics

Studies were undertaken to evaluate gaseous pollutants in workplace air within pulp and paper mills and to consider the effectiveness of photo-catalytic treatment of this air. Ambient air at 30 sampling sites in five pulp and paper mills of southern China were sampled and analyzed. The results revealed that formaldehyde and various benzene-based molecules were the main gaseous pollutants at these five mills. A photo-catalytic reactor system with titanium dioxide (TiO2) was developed and evaluated for degradation of formaldehyde, benzene and their mixtures. The experimental results demonstrated that both formaldehyde and benzene in their pure forms could be completely photo-catalytic degraded, though the degradation of benzene was much more difficult than that for formaldehyde. Study of the photo-catalytic degradation kinetics revealed that the degradation rate of formaldehyde increased with initial concentration fitting a first-order kinetics reaction. In contrast, the degradation rate of benzene had no relationship with initial concentration and degradation did not conform to first-order kinetics. The photo-catalytic degradation of formaldehyde-benzene mixtures indicated that formaldehyde behaved differently than when treated in its pure form. The degradation time was two times longer and the kinetics did not reflect a first-order reaction. The degradation of benzene was similar in both pure form and when mixed with formaldehyde.

Analysis of alginate implants degradation rate in rat myocardium

2014 ◽  
Vol 24 (2) ◽  
pp. 173-173
Author(s):  
Tatyana V. Shkand ◽  
◽  
Anatoliy L. Tatarets ◽  
Keyword(s):  
Degradation Rate ◽  
Rat Myocardium
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