Sorption behaviour of Pu⁴⁺and PuO₂²⁺on amido amine-functionalized carbon nanotubes: experimental and computational study

Abstract

Amido amine-functionalized multi-walled carbon nanotubes (MWCNT-AA) were used for efficient and selective solid phase separation of plutonium(iv) and plutonium(vi).

An insight into the sequestration of tetra and hexavalent actinides by tri ethoxysilyl-amino-propyl-3-oxa-glutaramic acid (SAPOGA) functionalized titania

“…For the isotherm analysis, the Langmuir, D–R and Freundlich models were considered. These are summarized below: 13 where C e (mg L −1 ) is the equilibrium concentration; q e is the amount of metal ion adsorbed (mg g −1 ) on the sorbent at equilibrium; q 0 is the sorption capacity; b is the sorption energy; X m and β are the maximum sorption capacity and activity coefficient, respectively; K f (mg g −1 ) is the Freundlich isotherm constant; and n is the sorption intensity. The experimental data were fitted into the linear equations of these isotherms mentioned above.…”

Diglycolic Acid Monoamide-Functionalized UiO-66-Based Metal Organic Framework (MOFDGAMA) for Selective Removal of UO22+ and Th4+

“…Obtained kinetics data were fitted into three different kinetics models: Lagergren first order ( SE1 ), pseudo-second order ( SE2 ), and intraparticle diffusion ( SE3 ) (Figures S1–S3). − Regression coefficient analysis showed that sorption kinetics fits best in the pseudo-second order model. The sorption isotherm shown in Figure C describes the maximum sorption capacity for UO 2 2+ ≈ 193 mg g –1 and Th 4+ ≈ 227 mg g –1 .…”

Diglycolamic Acid-Functionalized MWCNT-Augmented Polymeric Beads for Efficient Separation of Trivalent Lanthanides and Actinides

“…In order to understand the sorption process in more detail, the kinetic data was fitted to various sorption models, such as Lagergren (pseudo-first-order), intraparticle diffusion, and pseudo-second-order kinetics models. The Lagergren’s first-order kinetics is represented by the following equation ,, log ( q normale − q t ) = loq 0.25em q e − kt 2.303 where q e and q t are the amounts of radionuclides adsorbed by the PS-DGA-CNT beads at equilibrium and at time t , respectively; k is the adsorption rate constant and t is the time in minutes. The linear regression coefficients for the Lagergren first-order kinetic model for Am 3+ and Eu 3+ were found to be 0.9668 and 0.9465, respectively.…”