Abstract
Porous χ‐Al2O3 is a new material for fabricating coated inkjet printing paper. Paper coated with χ‐Al2O3 powders has excellent water fastness. This study investigated the dye‐fixing ability of χ‐Al2O3 powders through measurements of adsorption isotherms. The variations in zeta potential, pore volume, pore size distribution, and specific surface area of χ‐Al2O3 powders during the dye‐fixing process were also examined. The results show that χ‐Al2O3 powders have a strong affinity to dye colorants. The adsorption isotherm is classified as HA‐type and the adsorption data fit the Langmuir model. In addition to the positive‐charged surface of χ‐Al2O3 provides cationic sites for fixing dye colorants via electrostatic interaction, the porous structure on the surface of χ‐Al2O3 particles plays an indispensable role in trapping the colorant.
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