Sorption of Heavy Metals onto Selective Ion-Exchange Resins with Aminophosphonate Functional Groups

Abstract

The ion-exchange equilibria for the exchange of heavy metal ions (Cu 2+ , Ni 2+ , Cd 2+ , Zn 2+ , and Co 2+ ) and of Ca 2+ , Na + , and NH 4 + ions by two commercially available chelating ion-exchange resins with aminophosphonate functional groups (Purolite S 940 and S 950) have been studied. From simple binary systems of the exchange of each of the species for H + ions, the series of selectivity for these species were determined. Evaluation of the binary data by means of the surface complexation theory led to sets of binary equilibrium parameters that remain unchanged in multicomponent systems. By means of these parameter values, ternary and quaternary equilibria and equilibria with complexing-agent-bearing wastewaters from metal surface treatments were predicted and compared with experimental results. In all cases, very satisfactory agreement was found.

Waste Water Treatment after Removal of Thermic Oxides from Stainless Steel Welding Joints

“…The obtained sediment falls into the category of dangerous wastes and should be disposed following legal regulations. Removal of metals from diluted waste water can be performed in a much simpler way, by flowing the water through ionic transformers [10,11]. In this case diluted chromium and nickel can be recycled (i.e., used in some other processes-chroming and nickeling).…”

Preparation and Characterization of Styrene Bearing Diethanolamine Side Group, Styrene Copolymer Systems, and Their Metal Complexes

“…The ligands are very important for metal ion complexation because of their hydrophilicity, accessibility, and high capacity [5]. Such ligands include iminodiacetates [4,6], amides [7], hydroxylamines [8], Schiff bases [9], and phosphonates [10]. Usually, these ligands are prepared by the modification of crosslinked copolymers polystyrene, poly (vinyl benzyl) chloride, poly (glycidyl methacrylate), and polyacrylic acid [11].…”

Adsorption of lead, zinc and cadmium ions from contaminated water onto Peganum harmala seeds as biosorbent

“…Many separation methods including chemical precipitation (Esalah and Husein 2008), ion exchange (Kiefer and Höll 2001), reverse osmosis (Bakalár et al 2009), electroplating (Abo-Ghander et al 2006), solvent extraction (Zamani et al 2009) and transport through liquid membranes (Canet et al 2002;Srisuwan and Thongchai 2002) have been developed and used for removal of heavy metal ions from various water samples. It is noteworthy that the use of these methods are often limited due to high cost, high reagent and energy requirements, incomplete metal removal and/or production of waste products that themselves require further disposal or treatment.…”