New Methodology for Modifying Sodium Montmorillonite Using DMSO and Ethyl Alcohol

Area of Science:

• Materials Science
• Nanotechnology
• Clay Science

Background:

• Modified clays with organic molecules have diverse applications, including pollutant adsorption, catalysis, and drug delivery.
• Existing intercalation methodologies for clays often involve lengthy processes.
• Sodium Montmorillonite (Na-Mt) is a widely studied clay mineral with significant potential for modification.

Purpose of the Study:

• To develop and investigate a new, faster methodology for modifying Na-Mt with organic molecules, specifically dimethyl sulfoxide (DMSO).
• To characterize the resulting modified clay (DMSO-SMAT) using advanced analytical techniques.
• To evaluate the influence of DMSO concentration, temperature, and sonication time on the modification process.

Main Methods:

• Modification of Na-Mt using a mixture of ethyl alcohol, DMSO, and Na-Mt under magnetic stirring.
• Characterization of the modified clay (DMSO-SMAT) using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), BET surface area analysis, and thermogravimetric analysis (TG/DTG).
• Statistical analysis employing a 2^3-factorial design to assess process parameters.

Main Results:

• XRD and FTIR confirmed the intercalation of DMSO into the Na-Mt structure, increasing the interplanar distance by an average of 0.57 nm.
• BET analysis indicated a significant decrease in surface area (from 41.89 m²/g to 2.16 m²/g) and an increase in porosity.
• Thermal analysis demonstrated the thermal stability of DMSO-SMAT, with a calculated formula of Na[Al5Mg]Si12O30(OH)6 · 0.54 DMSO. The drying time was reduced to 30 minutes at room temperature.

Conclusions:

• The developed methodology offers a rapid and effective way to intercalate DMSO into Na-Mt, yielding a thermally stable material.
• The amount of DMSO was identified as the significant factor influencing the increase in interlayer space.
• The resulting DMSO-SMAT material holds promise for applications requiring modified clay structures with enhanced properties and faster processing.