Modeling the PAAc‐AN‐TV surface using ¹³⁴Cs and ^152+154Eu sorption

Abstract

A novel composite, composed of poly (acrylic acid (AAc), acrylonitrile, and titanium vanadate, was prepared by induced gamma irradiation route at 20 kGy to be used as a hybrid organic-inorganic sorbent. 5-200 lm particle diameters of the composite were obtained. An average particle size of 75 lm of crystalline (17-20) composite was used; it was thermally stable to 486 C. The distribution coefficients of Cs þ and Eu 3þ were studied as a function of pH; 2350 mL.g À1 and 645 mL.g À1 were obtained in case of 152þ154 Eu and 134 Cs at pH 6. 1.55 mmol.g À1 and 1.85 mmol.g À1 maximum loadings were accommodated for the same ions at the same pH. Different models were used to scan the surface of the exchanger, so that the topography of the surface was studied as a function of surface active site types, concentrations, and heterogeneity. Langmuir, Freundlich and D-R models were used. Also, different kinetic models, as Lagergren pseudo first-order, pseudo second-order and Morris-Weber intraparticle diffusion models were applied to study the possible mechanism of the sorption process; pseudo first-order was exempted to investigate the mechanism. They proved that chemisorption and ion exchange mechanism with controlled diffusion are predominant, with their characteristic mean energies (8.

Preparation of titanate nanoflower for sorption of 75Se(IV) radioisotope from aqueous solution: Equilibrium, kinetic and thermodynamic studies

“…Where 2 is the rate constant of second order sorption (g/(mg min)), e is the amount of 75 Se(IV) adsorbed at equilibrium (mg/g) and t is the amount of sorbate on the surface of the sorbent at any time (mg/g) [41]. Similarly, Figure 8b indicates the pseudo-second order model of the data through the plot of / t vs. .…”