Modified aluminum slag (MAS) was applied as an adsorbent for Congo red
(CR) prepared by the hydrothermal treatment of Ca(OH)2. At 25°C, with
a MAS dosage of 0.3 g, initial CR concentration of 100 mg/L and initial pH = 5,
and the adsorption time was 40 min, the CR removal efficiency was 98.41%. The
adsorption trend of CR conformed to the second-order kinetics, and the
adsorption isotherm follows the Freundlich isotherm model. Compared with RAS,
MAS has a larger pore volume and specific surface area. The mechanism of action
of MAS on CR was the interaction between membrane diffusion and internal
diffusion, and the adsorption rate during the membrane diffusion was the
fastest.
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