Solvent extraction of copper(II) from ammonium chloride and hydrochloric acid solutions with hydrophobic pyridineketoximes

Feasibility and enhancement of copper and ammonia removal from wastewater using struvite formation: a comparative research

“…Furthermore, copper etching by ammonia solution is commonly used in the manufacture of PCBs and the concentration of copper in spent solutions is usually high (up to 150 g L −1 ) . So the decontamination of spent solutions and rinsing waters is complicated because of the formation of stable water soluble complexes Cu(NH 3 ) n 2+ , where n ranges from 1–4 …”

“…9 So the decontamination of spent solutions and rinsing waters is complicated because of the formation of stable water soluble complexes Cu(NH 3 ) n 2+ , where n ranges from 1-4. 10 Because of the refractory characteristics of the chelated copper-ammonia wastewater, biological methods are usually not 326 www.soci.org C Peng et al…”

pH-sensitive hydrogel for coacervative cloud point extraction and spectrophotometric determination of Cu (II): optimization by central composite design

“…Various preconcentration and separation methods such as, liquid-liquid extraction (LLE) [5][6][7][8], cloud point extraction (CPE) [9][10][11][12], solid phase extraction (SPE) [13][14][15][16], ion exchange [17] and co-precipitation [18,19] hyphenated Abstract In this work a new coacervative extraction method using pH-sensitive hydrogel has been developed for preconcentration and spectrophotometric determination of Cu (II) based on the complex formation with Zincon (2-carboxy-2″-hydroxy-5″-sulfoformazylbenzene) in water samples. In the extraction step, appropriate amounts of poly (styrene-alt-maleic anhydride), as a pH-sensitive hydrogel, was added into the aqueous solution, so a rather cloudy solution was formed.…”

Equilibrium and mechanism of cobalt(II) extraction from chloride solution by hydrophobic 2-pyridineketoxime

“…The extraction ability of the pyridylketoximes towards copper(II), zinc(II), cadmium(II) and iron(III) from chloride solutions [17][18][19][20][21], copper(II) and nickel(II) from chloride/sulphate solution [22,23] and copper(II) from ammonium chloride/ammonia solution [24] has been widely investigated. While 1-(2-pyridyl)tridecan-1-one oxime is very suitable to apply for selective recovery of various metals from chloride solutions, its application to recovery of cobalt(II) ions has not been proposed so far.…”