Naslov
Ion-exchange Separation Ag(I) from Waste Waters

Autori
Cerjan-Stefanović, Štefica ; Kaštelan-Macan, Marija

Izvornik
International Journal of Environmental Analytical Chemistry (0306-7319) 38 (1990); 323-328

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Silver concentration; cation ion exchanger; silver sorption and elution

Sažetak
In photographic industry and for preparing silver films, waste waters are rich with silver. Some of the silver is electroanalitycally regenerated, but low concentrations (0.5 g/dm3) stay in waste waters. In our work, we separated and concentrated the silver by ion exchange resin. Fixing baths and stop baths are polyvalent solutions, therefore we examine synthetic solutions. For exchange of silver, Amberlit IRA-120 and Dowex 50x4 were used. The batch method was used to obtain a static equilibrium. The optimum medium concentrations and the time for sorption were determined: 1x10-3 moldm-3 HNO3 and 1 hour. Silver elution from cation exchanger is based on silver transformation to a stable anion complex. Reference data determinated the use of CN- and (S2O3)2- for forming stable complexes. By varying the ligands, pH and eluant concentrations, optimum elution has been in 1 hour, 2M KCN and 1M Na2S2O3.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA