Chelation Ion‐Exchange Properties of a Copolymer Derived from 2‐Hydroxyacetophenone, Oxamide and Formaldehyde

Copolymer resin. VII. 8‐hydroxyquinoline‐5‐sulfonic acid–thiourea–formaldehyde copolymer resins and their ion‐exchange properties

“…The amount of metal ions taken up by the copolymer in the presence of a given electrolyte of a known concentration was determined from the difference between the blank reading and the reading in the actual experiment. 15 The experiment was repeated in the presence of several electrolytes of known concentrations with five different metal ions: Fe(III), Co(II), Ni(II), Cu(II), and Pb(II). The same procedure was applied to all the molar ratios of the copolymer samples.…”

“…To estimate the time required to reach the state of equilibrium under the given experimental conditions, a series of experiments of the aforementioned type were carried out, in which the metal ion taken up by the copolymer resin was estimated from the time to room temperature (300 K) in the presence of 25 mL of a solution of NaNO 3 . It was assumed that under the given conditions, the state of equilibrium was established within 24 h. 15,16 The rate of metal-ion uptake was expressed as the percentage of the amount of metal ions taken up after a certain time related to that in the state of equilibrium. 15,17 Evaluation of the distribution of metal ions at different pHs.…”

“…It was assumed that under the given conditions, the state of equilibrium was established within 24 h. 15,16 The rate of metal-ion uptake was expressed as the percentage of the amount of metal ions taken up after a certain time related to that in the state of equilibrium. 15,17 Evaluation of the distribution of metal ions at different pHs. The distribution of each one of the five metal ions [Fe(III), Ni(II), Cu(II), Co(II), and Pb(II)] between the polymer phase and aqueous phase was estimated at 300 K and in the presence of a solution of NaNO 3 .…”

Synthesis, Characterization and Ion-Exchange Properties of Terpolymer Resin-II Derived from p-Hydroxybenzaldehyde, Thiourea and Ethylene Glycol

“…The metal content was determined by a spectrophotometer. The amount of metal exchanged was determined from the difference between reading in blank and actual experiments [9][10][11] . The amounts of metal ion in mg per g of resin were calculated in the presence of NaCl, NaNO 3 , NaClO 4 and Na 2 SO 4 electrolyte for metal ions Sb 3+ , Bi 3+ , Zn 2+ and Mg 2+ .…”

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.…”