Fast and selective removal of trace concentrations of bismuth (III) from water onto procaine hydrochloride loaded polyurethane foams sorbent: Kinetics and thermodynamics of bismuth (III) study

Kinetics and thermodynamic characteristics of cadmium(II) sorption from water using procaine hydrochloride physically impregnated polyurethane foam

“…The values of DH, DS, and DG of cadmium(II) uptake by PUFs sorbent were calculated from the intercept and slope of Fig. 7 The numerical values of DH and DS computed from the slope and intercept of the plot were À41.54 AE 0.9 kJ mol À1 , À144.58 AE3.1 J mol À1 K À1 , respectively with a correlation factor of 0 [37,39] that a solvent-like extraction mechanism is involved. The physical structure of PUFs membrane may be changed on raising temperature.…”

“…1) was used as received. A stock solution (0.1% m/v) of the reagent PQ + ÁCl À was prepared in water [37] in presence of few drops of dilute HNO 3 . Commercial polyurethane foams (PUFs) sheets of polyether type (gas bubbles occupy about 97% of the volume, mean diameter of the cells is about 0.7-0.8 mm with 12-14 cells/cm) were cut as cubes (10-15 mm, 3 kg m À3 ), washed with HCl (1.0 mol L À1 ), distilled water and acetone and finally dried as reported [35].…”

“…Some of these methods are not precise, expensive, and nonselective and require careful experimental conditions and considerable time consuming. The potentialities of PUFs for trace analysis and speciation of metal ions are promising [34][35][36][37][38][39][40][41][42]. PUFs sorbent represents one of the most are effective sorbent for metal speciation in water [36,38].…”

Synthesis, Voltammetric and Analytical Applications of Some Fluorine Substituted Spirosteroidalthiazolidin‐4‐one Derivatives of Sulfa Drugs

“…The half-life time (t 1/2 ) of the equilibrium sorption of bismuth (III) as calculated from the plot of -log (A b -A f )/A b vs. time onto immobilized PUFs from the aqueous media to reach 50% saturation of the sorption capacity was in the range 2-2.3 min, respectively in good agreement with the data reported earlier for bismuth(III) retention by solid phase extractor. 37 The extraction percentage (%E) and the distribution ratio (D) of bismuth (III) retention onto reagent 5a treated PUFs were better than that species were analyzed by measuring its absorbance at 420 nm vs. reagent blank. 37 Satisfactory recovery (90.8 ± 2.7)…”

“…37 The extraction percentage (%E) and the distribution ratio (D) of bismuth (III) retention onto reagent 5a treated PUFs were better than that species were analyzed by measuring its absorbance at 420 nm vs. reagent blank. 37 Satisfactory recovery (90.8 ± 2.7)…”