Enhanced microscopic structure and properties of palygorskite by associated extrusion and high-pressure homogenization process

• A facile and efficient method for dispersion of palygorskite bundles was developed.
• Extrusion and homogenization generate synergistic effect on dispersion and properties.
• Desirable disaggregation effect was achieved by controlling the extrusion times.
• The viscosity of dispersion enhanced by 1857% as compared to natural palygorskite.
• The specific surface area of the treated palygorskite increased by 38%.

A facile method was presented to disaggregate the crystal bundles of palygorskite (Pal) by combining the extrusion with high-pressure homogenization technique. The effects of extrusion times on the disaggregation degree of crystal bundles, the micro-structure and properties of Pal were investigated. Morphological characterization indicated that the crystal bundles were perfectly disaggregated without disrupting the rod-like single crystals after Pal extruded for three times and homogenized at 30 MPa. The specific surface area, micropore surface area, and micropore volume of the corresponding Pal increased from 175 m2/g, 31 m2/g, and 0.013 cm3/g (natural Pal) to 241 m2/g, 103 m2/g, and 0.048 cm3/g, respectively. Also, the viscosity of Pal dispersion increased from 152 mPa s (natural Pal) to 2976 mPa s.

A facile and effective method of extrusion associated with high-pressure homogenization process allows for producing well disaggregated palygorskite rod-like crystals and improved microstructural and colloidal properties.Figure optionsDownload as PowerPoint slide