Color Removal of Reactive Procion Dyes by Clay Adsorbents

The adsorptions of reactive procion brilliant red H-EGXL and procion yellow H-EXL by various clay adsorbents were investigated in this research. The research showed that synthetic talc has the highest adsorption capacity for decolorization of both procion type of reactive dyes compared with other clay adsorbents. The removal efficiencies of synthetic talc relatively stable above 80% until the initial dye concentration reached at 160 mg.L-1 of both reactive procion dyes when the liquid/solid ratio of 50 mL.g-1. Synthetic talc and kaolin showed higher adsorption capacity under acidic condition than neutral and alkaline condition because of higher zeta potential. The adsorption isotherm of synthetic talc and kaolin were fitted by Langmuir adsorption isotherm that assumes that dyes molecule only formed monolayer over the homogenous surface of adsorbent.