Investigation of a basic dye adsorption from aqueous solution onto raw and pre-treated sepiolite surfaces

摘要

The temperature,pH and ionic strength effects on the adsorption of crystal violet (CV)by raw,base activated and Al-saturated sepiolite samples were studied.Al-saturated sepiolite has relatively weak ability for CV adsorption compared to the raw clay,whereas the highest adsorption observed for the base activated sepiolite may be due to the Na~+ions replaced part of Mg~(2+)located at the edges of the channels.Different thermodynamic parameters for raw and pre-treated sepiolite samples indicate the adsorption of the dye component on a non-uniform surface.