Breakthrough curves of synthetic and real alkaline copper-plating wastewater (after NaOCl oxidation of cyanide and followed by neutralization) on an Amberlite IRC718 weakly acidic cation exchanger. Solution pH: 2.5; Cu(II) concentration: 450 ppm; amount of resin: 4 g; throughput rate: 1.3 mL/min.

Contexts in source publication

Context 1

... ppm Cu) was passed through 4 g of resin at 1.3 mL/min to confirm the previously found capacity of the resin. Simultaneously, a real alkaline wastewater sample containing 450 ppm cop- per (II) was treated with excessive NaOCl, treated with 1 M H 2 SO 4 to yield a final pH of 2.5, and passed through the resin column under identical conditions. (See Fig. 2 for breakthrough curves.) The retained copper from each separation was eluted with 50 mL of 1 M H 2 SO 4 ...

Context 2

... the dissolution of the hydrolytic copper (II) precipitate upon hypochlorite oxidation. Above approximately pH 3, the hy- drolytic Cu(II) precipitate could partly suspend in solution forming a colloidal so- lution, which would negatively affect overall copper recovery. The breakthrough curves of pure, synthetic, and real samples are shown in Fig. 2 and represent over- all copper yield efficiency of 99.0 ( 0.39)%. Elution of copper from the chelat- ing resin was made with 50 mL of 1 M H 2 SO 4 , yielding a desorption efficiency of 99.9 ( ...