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Abstract
The adsorption properties and mechanisms of a cationic-polymer/bentonite complex (EPI-DMA/bentonite),
prepared from polyepicholorohydrin-dimethylamine and bentonite, for non-ionic dyes
(Disperse Blue SBL and Vat Scarlet R) and anionic dyes (Reactive Violet K-3R and Acid
Dark Blue 2G) were investigated in this study. The solution pH, presence of salt and
surfactant can significantly affect the dye removal efficiency. The equilibrium data
were analyzed using the Langmuir and Freundlich models. The Langmuir model is the
most suitable to describe non-ionic dye adsorption, but for anionic dyes the Freundlich
model is best. The kinetic data for the adsorption of different dyes were analyzed
using pseudo first- and second-order equations, and the experimental data conformed
to the pseudo second-order kinetic model better. The possibility of intraparticle
diffusion was also examined by using the intraparticle diffusion equation. The single-stage
batch adsorber design for the adsorption of both types of dyes onto EPI-DMA/bentonite
was studied based on the Langmuir isotherm model for non-ionic dyes and the Freundlich
isotherm model for anionic dyes. The results showed that the required amount of EPI-DMA/bentonite
for 95% dye removal in 5 L dye solution with a concentration of 50 mg/L is 378.0 g
for DB SBL, 126.5 g for VS R, 9.7 g for RV K-3R and 15.5 g for ADB 2G.