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Chitosan microspheres loaded Cu(II) were prepared using a precipitation method and heterogeneously crosslinked with glutaraldehyde. The abilities of the binary [Cu(II)/Glut‐chitosan] system for binding two acid dyes, that is, Acid blue 25 (AB25) and Calmagite (Calma) were investigated. Sorption experiments were performed using a batch process at 25°C and indicate pH dependence. Evidence for the modification...