Ion-exchange properties of a salicylic acid–melamine–formaldehyde terpolymer resin

Synthesis of resin I: salicylic acid, hexamethylene diamine and formaldehyde and its ion-exchange properties

“…The results of the effect of pH on the amount of metal ion distributed between two phases are incorporated in Table 5. The results indicate that the relative amount of metal ions taken up by the terpolymer increases with increasing pH of the medium [32,35,36]. The study was carried out only up to a definite pH value for the particular metal ion to prevent hydrolysis of the metal ions at higher pH.…”

“…the weak ligand stabilization energy of the metal complexes [39,40]. The possible order of selectivity of a cation-exchange resin for divalent metal ions is [35]: Pd>Cu>Ni>Co>Zn>Cd>Fe>Mn>Mg. In the present study the observed order of distribution ratio of metal ions measured in the range of 1.5 to 6.5 pH was found to be Fe 3+ > Cu 2+ > Ni 2+ > Co 2+ > Zn 2+ > Cd 2+ > Pb 2+ .…”

“…Ion exchangers are widely used in hydrometallurgy, antibiotic purification, analytical chemistry, separation of radioisotopes and also find large scale application in water treatment and pollution control [1][2][3][4]. In our laboratory, extensive research work was carried out on synthesis and characterization of terpolymers and their ion exchange properties [5,6].…”

“…Resacetophenone (2,4 dihydroxy Aceto phenone)-formaldehyde and Resacetophenone oxime-formaldehyde polymer have been reported as ion exchangers [10][11]. In continuation with our departmental laboratory work on synthesis and characterization of chelating ion-exchangers [12][13][14], this article describes the synthetic, structural characterization and ion exchange properties of a new terpolymer derived from salicylic acid, hexamethylenediamine and formaldehyde.…”

Ion-Exchange Applications of Newly Synthesized of Aminoacetophenone, Biuret, Formaldehyde Derivative as New Chelating Terpolymer Resin

“…In 3 necks, volumetric flask, mixed of o-amino acetophenone (13.5 g, 0.1 mol) and biuret (10.30 g, 0.1 mol) with 37 % formaldehyde (9.0 g, 0.3 mol) in HCl medium at 130 °C in an oil bath for 5 h. After cooling, red brown solution was formed and next day poured in the ice water to obtain yellowish precipitate then washed with distilled water (Scheme-I). The dried resin was further purified by dissolving in 8 % NaOH and regenerated in 1:1(v/v) HCl/ water [10][11][12]. This process was repeated twice to separate the pure terpolymer resin and dried vacuum at room temperature.…”