Removal of copper(II) from aqueous solution in fixed-bed column by carboxylic acid functionalized deacetylated konjac glucomannan

► CADKGM can be prepared on a large scale through thermoplastic extrusion. ► CADKGM has good mechanic strength to support the fixed-bed column. ► Maximum removal efficiency of Cu2+ ions from the fluid by CADKGM was 99.7%. ► CADKGM can be regenerated and operated for multiple uses.