Hydrothermally synthesized MnO2 nanowires and their application in Lead (II) and Copper (II) batch adsorption

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Publikace nespadá pod Ekonomicko-správní fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.

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CLAROS Martha KUTA Jan EL-DAHSHAN Omar MICHALICKA Jan JIMENEZ Yecid P. VALLEJOS Stella

Rok publikování 2021
Druh Článek v odborném periodiku
Časopis / Zdroj Journal of Molecular Liquids
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://www.sciencedirect.com/science/article/pii/S0167732220374456?via%3Dihub
Doi http://dx.doi.org/10.1016/j.molliq.2020.115203
Klíčová slova Hydrothermal synthesis; Heavy metal adsorption; MnO2 nanowires
Popis Manganese oxide (MnO2) nanowires with diameters of 20 nm to 100 nm are synthesized by hydrothermal method. Chemical characterization of these nanostructures demonstrates the formation of Mn(IV), corroborating the MnO2 compound. The nanowires were used as adsorbents of Pb(II) and Cu(II) ions from water in batch system at room temperature. The results indicate faster adsorption rates and better affinity towards Pb(II) compared to Cu(II), since the adsorption capacity (3.730 [mg.g(-1)]) and the percentage of removal (99.99%) at equilibrium for Pb(II) are higher than those for Cu(II), 2.972 [mg.g(-1)] and 75.48%. The kinetics of adsorption was described by a pseudo-second order rate model for both ions, and Weber and Morris intra-particle diffusion model was used to a better understanding of the process. In addition, the Langmuir and Freundlich models were used to describe the isotherms, the first model was better adjusted for Cu(II) adsorption and the later for Pb(II) adsorption.
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