Synthesis, characterisation of ternary layered double hydroxides (LDH) for sorption kinetics and thermodynamics of Cd2+

被引：11

作者：

Abasi C.Y. ^{[1
]}

Ejidike I.P. ^{[1
]}

Dikio E.D. ^{[1
]}

机构：

[1] Applied Chemistry and Nanoscience Laboratory, Department of Chemistry, Faculty of Applied and Computer Sciences, Vaal University of Technology, Vanderbijlpark

来源：

International Journal of Environmental Studies | 2019年 / 76卷 / 03期

关键词：

Adsorption; cadmium; kinetics; layered double hydroxides; temperature;

D O I：

10.1080/00207233.2018.1517936

中图分类号：

学科分类号：

摘要：

Kinetic and thermodynamic studies were carried out on the sorption of Cd2+ on three synthesised and characterised layered double hydroxides, namely: Ni-Co-Ti, Ni-Co-La and Mn-Ni-Al-CO3. Sorption kinetics were investigated through time-dependent studies. Thermodynamics were determined by the effect of temperature on adsorption. Kinetic modelling of the adsorption of Cd(II) ions on the LDHs was determined using the first-order, pseudo-first order, pseudo-second order and Elovich kinetic models, as well as additional diffusion models. The results showed that the pseudo-second-order model best correlated the adsorption data with R2 values of 1.000, 0.998 and 1.000 for NiCoTi, NiCoLa and MnNiAl-LDH respectively. Diffusion of the adsorbate was best correlated by the Weber-Morris intraparticle diffusion model with R2 values of 0.9753, 0.8472 and 0.9412 for NiCoTi, NiCoLa and MnNiAl-LDH respectively. Thermodynamic studies showed that the adsorption was spontaneous and exothermic with a high probability of sticking. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

引用

页码：441 / 455

页数：14

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