Magnetic alginate beads with high basic dye removal potential and excellent regeneration ability

The adsorption of crystal violet (CV) dye onto magnetic alginate (MAlg) composite from 
aqueous solutions was studied. Experiments were carried out as function of contact time, 
dosage, temperature, pH, and CV concentration in the solutions. Optimum CV uptake was 
observed at equilibrium pH 7 and most of the CV was sorbed within 30 min. The equilibrium 
adsorption data were analyzed using two common adsorption models: Langmuir and 
Freundlich. The results revealed that Langmuir isotherm fit the experimental results well. The 
maximum adsorption capacity obtained from Langmuir isotherm equation was 0.113 mmol 
g− 1 at 298±1 K. The kinetics adsorption of CV onto MAlg composite was investigated using 
the pseudo first-order and pseudo second-order kinetic models.