Chromium (III) removal by supported liquid membranes: a comparison among D2HEPA, DNNSA, and a novel extractant as carriers.
A facilitated transport study in supported liquid membranes (SLM) using the extraction reagents di-2-ethylexilfosphoric acid (D2HEPA), dinonylnaftalene sulfuric acid (DNNSA), and a novel complexing agent, trimethyl cis,cis-1,3,5-tripropyl-1,3,5 cyclohexenetricarboxilic acid (TTCHTCA) as carriers has been carried out. Organic solvents with different dielectric constants as diluents have been used to obtain the highest extraction and transport values. The results obtained have shown that, by using different organic phases (carrier and/or diluent), SLMs with different ion flux and transport ability can be obtained. The carrier concentration in the membrane and the chromium (III) [Cr(III)] ions concentration in aqueous phase have been varied to see the effect on transport of Cr(III) ions across the membrane. For the carriers D2HEPA and TTCHTCA, the transport of Cr(IlI), both in batch and in recirculation operation mode, has been studied. Very good results in terms of flux and transport have been obtained using TTCHTCA.
Department of Chemical and Material Engineering, University of Calabria, Rende (CS), Italy. mg.buonomenna@itm.cnr.it
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D002274:Carcinogens, Environmental / Q000302:isolation & purification*; D002857:Chromium / Q000302:isolation & purification*; D003510:Cyclohexanes / Q000737:chemistry*; D005374:Filtration / Q000295:instrumentation*; D007220:Industrial Waste; D007474:Ion Exchange; D012989:Soil Pollutants; D013056:Spectrophotometry, Ultraviolet; D013464:Sulfuric Acids / Q000737:chemistry*; D014233:Tricarboxylic Acids / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
D002274:Carcinogens, Environmental; D003510:Cyclohexanes; D007220:Industrial Waste; D012989:Soil Pollutants; D013464:Sulfuric Acids; D014233:Tricarboxylic Acids; C512889:trimethyl cis,cis-1,3,5-tripropyl-1,3,5 cyclohexenetricarboxilic acid; D002857:Chromium