Recycling of Ni(II)?citrate complexes using precipitation in alkaline solutions

Reaction of aqueous Cu–Citrate with MnO2 birnessite: Characterization of Mn dissolution, oxidation products and surface interactions

“…2A. The shoulder peaks at bands 3841 cm À1 and 3748 cm À1 may represent AOH intermolecular bonding between enolic forms of acetonedicarboxylate or acetoacetate, whereas a band at 3625 cm À1 in the Cu-citrate solution represents conjugated vAOH stretching vibrations (Gyliene et al, 2004;Wade, 2011). Finally, the peaks at 1481 cm À1 of the Cu-citrate solution and at 1465 cm À1 were ascribed to rocking of the CH 2 methyl groups, possibly in transition from intramolecular proton transfers common in tautomeric capable b-keto acids.…”

Simultaneous biodegradation of Ni–citrate complexes and removal of nickel from solutions by Pseudomonas alcaliphila

“…They are also used in the extraction of toxic metals and radionuclides from wastes, sludges, sediments, and contaminated soils (Francis and Dodge, 1998). However, when treating metal-bearing wastewater, the presence of complexes makes chemical precipitation less effective (Malik, 2004), especially when the complexes are in excess of the metals (Gyliene et al, 2004). Adsorption, ion exchange and reverse osmosis processes have been utilized for the removal of chelated metals from solutions (Gyliene et al, 2009;Juang et al, 2006;Lu et al, 2010;Ozaki et al, 2002), but no satisfactory chemical or physical methods have been developed to cheaply remove or recover chelated metals from dilute solutions.…”

Recovery and reuse of Ni(II) from rinsewater of electroplating industries

“…Conventional methods for the removal of Ni(II) from wastewaters include chemical precipitation, chemical reduction, flocculation, filtration, evaporation, solvent extraction, biosorption, activated carbon adsorption, ion-exchange, reverse osmosis, electrodialysis, membrane separation processes, etc. The chemical precipitation [11], is the most cost-effective treatment technology. The possibility to precipitate metals in the form of insoluble * Corresponding author.…”