Cadmium(II) ions removal using dried banana bunch powder: experimental, kinetics, and equilibria

An algorithm was developed for the simulation of a phase transition in solid state whichmakes it possible to obtain the kinetic curves of transformation under different initialconditions (the number and arrangement of new phase nuclei, the distance betweenthe nearest nuclei). The simulation results were analyzed using the Kolmogorov-Johnson-Mehl-Avrami equation and the corresponding coefficients were determined.The correlation between the simulation results and the experimental kinetics of theaustenite isothermal transformation in alloyed steels was shown.

Download Full-text

Исследование изменения лигандного состава хелата Eu-=SUP=-3+-=/SUP=- методами двухступенчатого лазерного возбуждения люминесценции и компьютерного моделирования кинетики

Журнал технической физики ◽

10.21883/os.2019.02.47194.176-18 ◽

2019 ◽

Vol 126 (2) ◽

pp. 134

Author(s):

И.В. Станишевский ◽

Т.А. Павич ◽

С.М. Арабей

Keyword(s):

Dynamic Model ◽

Rate Constants ◽

Structural Rearrangement ◽

Triphenylphosphine Oxide ◽

Iterative Approximation ◽

Reversible Processes ◽

Experimental Kinetics ◽

Nelder Mead Algorithm ◽

Excitation Method ◽

The Eu

AbstractThe europium(III)–tris(dibenzoylmethane)–triphenylphosphine oxide complex was studied in the polycrystalline state and in toluene at 298 K using the luminescence excitation method with two-stage rectangular pulses with decreasing intensity of stages. Experimental nonmonotonic kinetic curves were numerically simulated within the framework of a four-level dynamic model describing reversible processes in the complex, associated with its structural rearrangement. The maximum correspondence between the experimental and simulated curves was obtained using an iterative approximation performed using the Nelder–Mead algorithm. Based on the obtained numerical values of the rate constants and parameters of the model, experimental kinetics were interpreted, and it was concluded that they are a consequence of the processes associated with changes in the ligand composition of the Eu^3+ chelate.

Download Full-text

Dye removal abilities of the mesophilic and thermophilic biomass: a kinetics study

Global NEST Journal ◽

10.30955/gnj.002608 ◽

2018 ◽

Vol 20 (2) ◽

pp. 408-416

Keyword(s):

Intraparticle Diffusion ◽

Second Order ◽

Intraparticle Diffusion Model ◽

First Order Kinetics ◽

Different Types ◽

Pseudo Second Order ◽

Acidic Conditions ◽

Red Dye ◽

Experimental Kinetics ◽

Kinetics Of

Mesophilic biomass and thermophilic biomass samples were isolated and used to remove Dorasyn Red dye from aqueous solutions. The biosorption kinetics of dye uptake by four different types of biomass at three temperatures (20, 30, and 40 °C) were investigated using pseudo-first order kinetics, pseudo-second order kinetics, intraparticle diffusion, Elovich, and Bangham models. The pseudo-second-order kinetics model and the first stage of the intraparticle diffusion model were effective in describing the experimental kinetics data. The biosorption results showed that the mesophilic biomass samples could be useful for removing dye under acidic conditions.

Download Full-text