scholarly journals Physicochemical Properties of α,ω-Type Surfactant in Aqueous Solution. Bis(triethylammonium) 1,20-Eicosanediyl Disulfate

1989 ◽  
Vol 62 (4) ◽  
pp. 1032-1036 ◽  
Author(s):  
Kenji Ikeda ◽  
Motoharu Ishikawa ◽  
Masaaki Yasuda ◽  
Kunio Esumi ◽  
Kenjiro Meguro ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Physicochemical Properties

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

Physicochemical Properties of Aryl Oleate Surfactants in Aqueous Solution

2008 ◽  
Vol 26 (4) ◽  
pp. 413-422
Author(s):  
Z. Xu ◽  
Y. Tian ◽  
M. Zhu ◽  
W. Qiao ◽  
Z. Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Physicochemical Properties

scholarly journals The Removal Performance and Mechanisms of Tetracycline Over Mn-rich Limonite

2021 ◽  
Author(s):  
Luyao Wang ◽  
Hanlin Wang ◽  
Haibo Liu ◽  
Xuehua Zou ◽  
Dong Chen ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Physicochemical Properties ◽  
Active Sites ◽  
Manganese Oxides ◽  
Mesoporous Structure ◽  
High Specific Surface Area ◽  
Solution Ph ◽  
Natural Mineral ◽  
Naturally Occurring ◽  
Ft Ir

Abstract Naturally occurring Mn-rich limonite mainly composed of goethite and manganese oxides was used to remove tetracycline (TC) from the aqueous solution. The physicochemical properties of limonite were illustrated by various characterization techniques such as XRD, FE-TEM, XPS and FT-IR. The effects of dosage, initial solution pH, temperature and coexisting anions on TC removal were investigated. The results showed that TC could be efficiently adsorbed by limonite with high specific surface area and mesoporous structure through electrostatic interaction and complexation. The co-existence of PO43- inhibited the adsorption of TC by limonite due to the competition with TC for active sites. In addition, manganese oxides exhibited oxidative properties to TC, and the singlet oxygen (1O2) generated during the redox reaction was responsible for TC degradation. Furthermore, the regenerated limonite displayed an efficient recycling performance after four cycles. This study revealed that the Mn-rich limonite was a promising adsorbent for TC removal from aqueous solutions and promoted the application of natural mineral material in the environmental field.

scholarly journals Suitability Assessment of Legal Regulation of Chemical Concentrations According to Vapor Pressure and Damage Radius

2019 ◽  
Vol 16 (3) ◽  
pp. 347 ◽  
Author(s):  
Hyo Eun Lee ◽  
Seok J. Yoon ◽  
Jong-Ryeul Sohn ◽  
Da-An Huh ◽  
Seok-Won Jang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Vapor Pressure ◽  
Physicochemical Properties ◽  
Hydrogen Chloride ◽  
Hydrogen Fluoride ◽  
Aqueous Ammonia ◽  
Legal Regulation ◽  
Chemical Accidents ◽  
Low Concentrations

Many chemicals used in the industrial field present risks, which differ depending on their chemical properties. Additionally, their various physicochemical properties change considerably with concentration. Many chemicals are used in customized processes in factories in the form of different aqueous solutions. The Korean Chemicals Control Act evaluates “hazardous chemicals,” describes their risks to the public, and regulates their concentration. To prepare against chemical accidents, factories construct models of potential damage radius, which is greatly influenced by a chemical’s vapor pressure. This study selected substances with widely varying vapor pressures (hydrogen fluoride, hydrogen chloride, aqueous ammonia, and hydrogen peroxide) and compared the results of different modeling programs (KORA, ALOHA, PHAST, and RMP*Comp) for various aqueous solution concentrations. The results showed that damage radius and vapor pressure increased similarly for each substance. Damage radius was negligible at low concentrations for all substances studied. Damage radius of ammonia solution increased with vapor pressure. Hydrogen fluoride is not found in aqueous solution at concentrations of less than 37%, and hydrogen peroxide does not show a large damage radius at low concentrations. However, the Chemicals Control Act strictly regulates hydrogen fluoride concentration beginning at 1%, hydrogen chloride and aqueous ammonia at 10%, and hydrogen peroxide at 6%. To effectively prepare against chemical accidents, we must examine scientifically-based, suitable regulations based on physicochemical properties.

Some Physicochemical Properties of the Chromium(III) Hydrous Oxide-Aqueous Solution Interface

1995 ◽  
Vol 169 (1) ◽  
pp. 149-160 ◽  
Author(s):  
Carla E. Giacomelli ◽  
Marcelo J. Avena ◽  
Osvaldo R. Camara ◽  
Carlos P. De Pauli
Keyword(s):  
Aqueous Solution ◽  
Physicochemical Properties ◽  
Hydrous Oxide ◽  
Solution Interface

Synthesis and physicochemical properties in aqueous solution of the sequential polypeptide poly(Tyr-Ala-Glu)

Biopolymers ◽  
1971 ◽  
Vol 10 (10) ◽  
pp. 1829-1851 ◽  
Author(s):  
Janakramana Ramachandran ◽  
Arieh Berger ◽  
Ephraim Katchalski
Keyword(s):  
Aqueous Solution ◽  
Physicochemical Properties
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