title: Catalytic oxidation processes for removing dimethylsulfoxide from wastewater.
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).
authors.affiliation: Institut Charles Gerhardt, UMR 5253, CNRS-UM2-ENSCM-UM1, Matériaux Avancés pour la Catalyse et la Santé, 8 rue de l'Ecole Normale, 34 296 Montpellier Cedex 5, France.
authors.forename: Alina-Livia
authors.initials: AL
authors.lastname: Maciuca
authors.forename: Emil
authors.initials: E
authors.lastname: Dumitriu
authors.forename: François
authors.initials: F
authors.lastname: Fajula
authors.forename: Vasile
authors.initials: V
authors.lastname: Hulea
mesh_terms: D000536:Aluminum Hydroxide / Q000737:chemistry; D002384:Catalysis; D004121:Dimethyl Sulfoxide / Q000302:isolation & purification*; D004338:Drug Combinations; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006861:Hydrogen Peroxide / Q000737:chemistry; D008276:Magnesium Hydroxide / Q000737:chemistry; D010084:Oxidation-Reduction; D017973:Tungsten Compounds / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D004338:Drug Combinations; D017973:Tungsten Compounds; C013591:aluminum hydroxide, magnesium hydroxide, drug combination; D000536:Aluminum Hydroxide; D006861:Hydrogen Peroxide; D008276:Magnesium Hydroxide; C045951:tungstate; D004121:Dimethyl Sulfoxide