The Effect of Sulfurhexafluoride on the Photochemistry of Aqueous Solutions

1971 ◽  
Vol 49 (8) ◽  
pp. 1262-1267 ◽  
Author(s):  
R. C. Rumfeldt
Keyword(s):  
Aqueous Solutions ◽  
Low Concentration ◽  
The Relationship ◽  
Saturated Solutions

The effect of SF6 as a specific scavenger for eaq− in the photolysis of aqueous solutions has been studied. The photolysis of aqueous solutions of I− with 2537 Å light and Br−, Cl−, and SCN− with 1849 Å light containing [SF6] = 1.4 × 10−3 M results in the formation of F−, the yields of which are [Formula: see text], 1.98 ± 0.05, 2.40 ± 0.08, and 2.07 ± 0.05, respectively. By comparison with [Formula: see text]from N2O saturated solutions the relationship [Formula: see text] was confirmed. Assuming the same ratio, [Formula: see text] for pure H2O and aqueous HPO42− with 1849 Å radiation and [SF6] = 2.4 × 10−4 is 0.013 ± 0.002 and 0.30 ± 0.07, but these are considered minimum values due to the low concentration of SF6. Despite these yields HPO42− could be used as buffer in 1849 Å photolysis due to its low extinction at this wavelength.

scholarly journals Photoreduction of Cr(VI) Ions in Aqueous Solutions by UV/ Photocatalytic Processes

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Chih Ming Ma ◽  
Yung Shuen Shen ◽  
Po Hsiang Lin
Keyword(s):  
Aqueous Solutions ◽  
Reaction Rate ◽  
Removal Rate ◽  
Experimental Results ◽  
Order Kinetic ◽  
Solution Ph ◽  
Relationship Of ◽  
The Relationship ◽  
Photocatalytic Processes ◽  
Order Kinetic Equation

This study discussed the photoreduction of Cr(VI) ions in aqueous solutions by UV/TiO2photocatalytic processes under various operational factors. Experimental results showed that the removal rate of Cr(VI) increased with decreasing solution pH values and with increasing dosages of organic compounds, indicating that the recombination rate of electrons and h+can be retarded in the reaction systems by the addition of the scavenger, thus raising the reaction rate of Cr(VI). The relationship of the chemical reaction rate of Cr(VI), TiO2dosage, and changes of Cr(VI) concentration was expressed by the pseudo-first-order kinetic equation. Comparing the experimental results of two different doping metals in modified TiO2photoreduction systems, the removal rate of Cr(VI) by the Ag/TiO2process is larger, possibly because the electron transferring ability of Ag is superior to that of Cu. However, the photoreduction rates of Cr(VI) by modified UV/TiO2processes are worse than those by a nonmodified commercial UV/TiO2process.

scholarly journals Investigation on the Influence of Microstructure Based on Hydrogen Bonding on Surface Tension by Raman Spectroscopy

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Nannan Wu ◽  
Shunli Ouyang ◽  
Junjie Cui ◽  
Shiliang Liu ◽  
Mingzhe Zhang ◽  
...  
Keyword(s):  
Surface Tension ◽  
Raman Spectroscopy ◽  
Hydrogen Bonding ◽  
Aqueous Solutions ◽  
Tracking System ◽  
Binary Solution ◽  
Spectroscopic Method ◽  
Mixed Solution ◽  
Direct Experiment ◽  
The Relationship

Surface tension (http://mts.hindawi.com/update/) in our Manuscript Tracking System and after you have logged in click on the ORCID link at the top of the page. This link will take you to the ORCID website where you will be able to create an account for yourself. Once you have done so, your new ORCID will be saved in our Manuscript Tracking System automatically."?>and Raman spectra containing hydrogen bonding in acetonitrile aqueous solutions with different mole ratios were obtained. Varied surface tension and hydrogen bonding in the mixed solution were discussed. For this purpose, the OH stretching bands were fitted into three Gaussian components to which different hydrogen-bonded water samples were assigned. Furthermore, the microstructures of binary solution were analyzed. The results indicated that the surface tension decreases dramatically with the enhancement of hydrogen bonds in the mixture. A spectroscopic method for studying the macroscopic properties of aqueous solutions was employed. The direct experiment results provided the relationship between surface tension and microstructure in aqueous solutions.

scholarly journals Recovery of gold(0) nanoparticles from aqueous solutions using effluents from a bioremediation process

RSC Advances ◽  
2016 ◽  
Vol 6 (114) ◽  
pp. 112784-112794 ◽  
Author(s):  
Ana Assunção ◽  
Bernardete Vieira ◽  
João P. Lourenço ◽  
Maria Clara Costa
Keyword(s):  
Aqueous Solutions ◽  
Biological Processes ◽  
Low Concentration ◽  
Secondary Sources

Biological processes for the recovery of gold from low-concentration media derived from leaching of secondary sources are of great importance due to the scarcity of the primary resources and the economic and environmental advantages of these methods.

Investigation on Correlation between the Modified Criterion and the Glass-Forming Ability for Metallic Glasses

2010 ◽  
Vol 97-101 ◽  
pp. 591-596
Author(s):  
Wen Bin Sheng ◽  
Chun Ming Zhang ◽  
Wan Li Gu
Keyword(s):  
Aqueous Solutions ◽  
Cooling Rate ◽  
Metallic Glasses ◽  
Statistical Correlation ◽  
Glass Forming Ability ◽  
Correlation Parameter ◽  
Glass Forming ◽  
A Value ◽  
The Relationship ◽  
Modified Equation

A modified criterion γ’ (=Tx/(1.5Tg+Tl) of glass-forming ability (GFA) for metallic glasses is suggested on the basis of present criterion γ (=Tx/(Tg+Tl) that correlates well with some systems including metallic glasses, some glassy oxides and some cryo-protective aqueous solutions. Results show that the modified criterion γ’ shows stronger correlation with the critical cooling rate Rc for metallic glasses than the criterion γ, which is demonstrated by a value increase in the statistical correlation parameter R2 from 0.9022 to 0.9037. Furthermore, a modified equation is given to reflect the relationship between γ’ and Rc.

scholarly journals Mechanism of gelation in low-concentration aqueous solutions of silver nitrate with l-cysteine and its derivatives

Soft Matter ◽  
2017 ◽  
Vol 13 (30) ◽  
pp. 5168-5184 ◽  
Author(s):  
Svetlana D. Khizhnyak ◽  
Pavel V. Komarov ◽  
Maxim M. Ovchinnikov ◽  
Lubov V. Zherenkova ◽  
Pavel M. Pakhomov
Keyword(s):  
Aqueous Solutions ◽  
Silver Nitrate ◽  
Low Concentration

A mechanism of gelation in aqueous solutions of silver nitrate with l-cysteine and its derivatives is discussed.

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