Copper(II) removal and/or recovery from wastewaters, e.g., washing water of contaminated soils,was investigated by using a new chelant, the molecule 2-hydroxy-5-dodecylbenzaldehyde (2-H-5-DBA), never used before as a ligand for metal ions. This material was designed and synthesizedby improving a method reported in the literature, obtaining a very high yield (80 vs 19%). Processselectivity and supported liquid membrane (SLM) viability were studied. The operating conditionsand selectivity of the process were found by means of L-L extraction tests performed at differentcarrier concentrations (10, 30, and 50% v/v) using kerosene as the solvent. At 50% v/v carrierconcentration and pH 5, the selectivities of Cu2+ separation vs Ni2+, Zn2+, and Mn2+ were 4.25,315.0, and 280.0, respectively. The carrier concentration had a strong influence on the viabilityof the SLM process: indeed, by increasing the concentration of the carrier, the operating pHcould be decreased, thereby avoiding copper precipitation in the feed phase. The enrichmentfactor of Cu2+ in the strip ([Cu2+]strip/[Cu2+]feed)final was 23.5
Copper(II) Removal from Wastewaters by a New Synthesized Selective Extractant and SLM viability
Molinari R.;Cassano R.;Picci N.;Argurio P.
2004-01-01
Abstract
Copper(II) removal and/or recovery from wastewaters, e.g., washing water of contaminated soils,was investigated by using a new chelant, the molecule 2-hydroxy-5-dodecylbenzaldehyde (2-H-5-DBA), never used before as a ligand for metal ions. This material was designed and synthesizedby improving a method reported in the literature, obtaining a very high yield (80 vs 19%). Processselectivity and supported liquid membrane (SLM) viability were studied. The operating conditionsand selectivity of the process were found by means of L-L extraction tests performed at differentcarrier concentrations (10, 30, and 50% v/v) using kerosene as the solvent. At 50% v/v carrierconcentration and pH 5, the selectivities of Cu2+ separation vs Ni2+, Zn2+, and Mn2+ were 4.25,315.0, and 280.0, respectively. The carrier concentration had a strong influence on the viabilityof the SLM process: indeed, by increasing the concentration of the carrier, the operating pHcould be decreased, thereby avoiding copper precipitation in the feed phase. The enrichmentfactor of Cu2+ in the strip ([Cu2+]strip/[Cu2+]feed)final was 23.5I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
