Removal of Methyl Violet and Cationic Gold Yellow from Aqueous with Porous Magnetic Polymer Microspheres and Its Adsorption Kinetics

Abstract

Porous magnetic polymer microspheres (PMPMs) were used as an adsorbent to removal of methyl violet (MV) from wastewater. Ethanol/water co-solvent mixtures in combination with various inorganic salts were used as eluents to regenerate PMPMs. The desorption capacity of the eluents were systematically investigated. The results showed that when ethanol/water co-solvents were used as the eluent, the desorption efficiency increased with the ethanol concentration. Incorporation of inorganic salts into the co-solvents greatly improved the desorption efficiency of the eluents. Among the eluents, a mixture of ethanol/water (8/2, v/v) in combination with 0.1M KCl exhibited excellent ability for recovering cationic dyes and regenerating PMPMs, which was again demonstrated during treatment of wastewater containing cationic golden yellow. Furthermore, the adsorption kinetics of methyl violet by PMPMs was also studied. It was found that the adsorption capacity depended on the initial concentration of dyes, and the pseudo-second-order model was more suitable to describe adsorption kinetics of methyl violet than the pseudo-first-order model.