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2 results on '"dimethylsulfone"'

1. Comparative Evaluation of Dimethylsulfoxide and Dimethylsulfone Adsorption on a Smooth Platinum Electrode in Acidic Environment.

Author

Akhmedov, M. A., Ibragimova, K. O., and Khidirov, Sh. Sh.

Subjects
*DIMETHYL sulfoxide, *ADSORPTION (Chemistry), *ADSORPTION isotherms, *PLATINUM electrodes, *MOLECULAR spectroscopy, *ADSORBATES
Abstract

a comparative assessment of dimethylsulfoxide and dimethylsulfone adsorption on a smooth platinum electrode in acidic medium in the region of anode potentials is presented. The adsorption isotherms in the "hydrogen" potential range, depending on the dimethylsulfoxide and dimethylsulfone concentration, are S-shaped. At the adsorbate concentrations in the solution exceeding 0.1 M, the surface coverage with dimethylsulfoxide and dimethylsulfone is nearly the same and changes but slightly. A significant difference in the adsorption characteristics of dimethylsulfoxide and dimethylsulfone in the potential region of oxygen adsorption is found. According to the Pt-electrode surface coverage with oxygen in the presence of the test substances, it was concluded that the value of the dimethylsulfoxide and dimethylsulfone adsorption is maximal only when their bulk concentration is higher than 0.1 M, here the oxygen surface coverage in the presence of dimethylsulfone exceeds that in the background solution. [ABSTRACT FROM AUTHOR]

Published
2020
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2. Catalytic oxidation processes for removing dimethylsulfoxide from wastewater

Author

François Fajula, Emil Dumitriu, Alina-Livia Maciuca, Vasile Hulea, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Laboratory of Organic Chemistry (UTI), Faculty of Chemical Engineering-Technical University of Iasi, Eiffel, Institut Charles Gerhardt de Montpellier - Université Technique de Iasi, and Roumanie

Subjects
Environmental Engineering, Tungstate, Magnesium Hydroxide, Health, Toxicology and Mutagenesis, Inorganic chemistry, Dimethylsulfone, Aluminum Hydroxide, engineering.material, 010402 general chemistry, 01 natural sciences, Waste Disposal, Fluid, Catalysis, Ultraviolet visible spectroscopy, Adsorption, X-Ray Diffraction, Environmental Chemistry, Dimethyl Sulfoxide, Environmental Restoration and Remediation, Aqueous solution, 010405 organic chemistry, Chemistry, Public Health, Environmental and Occupational Health, Layered double hydroxides, General Medicine, General Chemistry, [CHIM.CATA]Chemical Sciences/Catalysis, Hydrogen Peroxide, Tungsten Compounds, Pollution, 6. Clean water, 0104 chemical sciences, Solvent, Drug Combinations, Catalytic oxidation, Layered double hydroxide, engineering, Paratungstate, Oxidation-Reduction, Waste disposal
Abstract

An effective method for removing dimethylsulfoxide (DMSO) from wastewater, based on the mild selective catalytic sulfoxidation with H(2)O(2), is proposed in this study. The catalysts are W-containing layered double hydroxides (LDH), and they were obtained by ionic exchange of the nitrate anions from MAl-LDH precursors (M=Mg(2+) or Zn(2+)) with both WO(4)(2-) and W(7)O(24)(6-) species. Results of X-ray diffraction (XRD), N(2) adsorption, thermal gravimetric analysis (TGA), diffuse reflectance ultraviolet spectroscopy (DRUV) and Raman spectroscopy confirmed the formation of the W-oxospecies inside the interlayer space and the modification of the textural properties upon the exchange process. All catalysts showed very good activity and stability in the DMSO conversion into dimethylsulfone with dilute H(2)O(2) aqueous solution, at low temperatures (20-50 degrees C). The efficiency of the H(2)O(2) was higher than 95% and the behaviour of the water as solvent was very close to that of the organic solvents (ethanol, acetonitrile, 1,4-dioxane).

Published
2006
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