Abstract
In this study, a novel core@shell bead adsorbent was fabricated by using poly (acrylic acid) (PAA) microgels and polyethersulfone (PES) via a facile and versatile strategy for dye uptake from wastewater. PAA microgels were synthesized by distillation precipitation polymerization, followed by enwrapping with PES films to form core@shell beads by a phase inversion technique. The scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) mapping confirmed that the bead had a core@shell structure with PAA microgels in the core and PES on the shell. Batch adsorption experiments indicated that the contact time, initial dye concentration, adsorbent dosage, pH and ionic strength greatly affected the adsorption process. The beads could adsorb methylene blue as high as 84.82mg/g while the adsorption capacities of methyl violet, rhodamine B, amaranth red and methyl orange were 43.37, 14.60, 2.93 and 2.29mg/g, respectively. Simultaneously, the beads were recyclable for the removal of dye and the adsorption process fitted well with the non-linear Freundlich isotherm. All the results indicated that the prepared beads were promising in dye treatment.
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