Catalytic oxidation processes for removing dimethylsulfoxide from wastewater.
Alina-Livia Maciuca1, Emil Dumitriu, François Fajula
1Institut 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.
Chemosphere
|February 27, 2007
Summary
This study introduces a novel catalytic method using tungsten-containing layered double hydroxides (LDH) to effectively remove dimethylsulfoxide (DMSO) from wastewater. The process efficiently converts DMSO into dimethylsulfone using hydrogen peroxide under mild conditions.
Area of Science:
- Environmental Chemistry
- Catalysis
- Materials Science
Background:
- Dimethylsulfoxide (DMSO) is a common industrial solvent, but its presence in wastewater poses environmental challenges.
- Effective and sustainable methods for removing DMSO from industrial effluents are crucial.
Purpose of the Study:
- To develop an efficient catalytic method for the selective oxidation of DMSO in wastewater.
- To synthesize and characterize tungsten-containing layered double hydroxides (LDH) as catalysts for this process.
Main Methods:
- Synthesis of W-containing LDH catalysts via ionic exchange using MgAl-LDH or ZnAl-LDH precursors.
- Characterization of catalysts using XRD, N(2) adsorption, TGA, DRUV, and Raman spectroscopy.
- Catalytic oxidation of DMSO using dilute H(2)O(2) in aqueous solutions at low temperatures (20-50 °C).
Main Results:
- Successful incorporation of W-oxospecies into the interlayer space of LDH catalysts, modifying their textural properties.
- High catalytic activity and stability observed for all synthesized W-LDH catalysts in DMSO conversion.
- Over 95% efficiency in H(2)O(2) utilization for DMSO to dimethylsulfone conversion.
- Water demonstrated effectiveness as a solvent, comparable to organic solvents.
Conclusions:
- W-containing LDH catalysts offer an effective and stable solution for DMSO removal from wastewater.
- The catalytic sulfoxidation process is efficient under mild conditions, making it environmentally friendly.
- This method presents a promising approach for treating DMSO-contaminated industrial wastewater.
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