Removal of thorium by modified multi-walled carbon nanotubes: Optimization, thermodynamic, kinetic, and molecular dynamic viewpoint

被引：0

作者：

Yılmaz, Cansu Endes ^{[1
]}

Aslani, Mahmoud A.A. ^{[1
]}

Aslani, Ceren Kütahyalı ^{[1
]}

机构：

[1] Ege University, Institute of Nuclear Sciences, Bornova, Izmir,35100, Turkey

来源：

Progress in Nuclear Energy | 2020年 / 127卷

关键词：

One of the crucial aspect of nuclear waste management is the radioactive waste stream released from the nuclear fuel cycle. In radioactive waste treatment; adsorption is one of the most powerful methods for the pre-concentration process. In this study; functionalization of multiwalled carbon nanotubes (MWCNTs) using potassium permanganate (KMnO4) and citric acid (C6H8O7) as oxidizing agents was investigated for adsorption of thorium from aqueous solutions named PPM-MWCNTs and CA-MWCNTs; respectively. The central composite design technique was used to examine the initial thorium concentration; pH; and temperature as the adsorption parameters. The thermodynamic parameters (standard enthalpy (ΔH°); entropy; (ΔS°); and free energy (ΔG°)) were determined and the results indicated that both adsorption systems were endothermic processes. The adsorption isotherms of modified MWCNTs were investigated using the Langmuir; Freundlich and Dubinin-Radushkevich isotherm models for characterizing the process. According to the high correlation coefficients; the Langmuir model described well the adsorption of thorium on PPM-MWCNTs and CA-MWCNTs and adsorption capacities were found to be 105.28 and 50.67 mg g−1; respectively. In addition; molecular dynamics simulations were successfully performed on the Th bonded modified MWCTNs. © 2020 Elsevier Ltd;

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