Zinc Adsorption Property of Gamma-MnO2 Nanostructure: Equilibrium and Kinetic Studies

Van Phuc Dinh; Ngoc Chung Le; Thi Phuong Tu Nguyen; Thi Dong Thuong Hoang; Van Dong Nguyen; Ngoc Tuan Nguyen

doi:10.4028/www.scientific.net/KEM.708.3

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Zinc Adsorption Property of Gamma-MnO₂ Nanostructure: Equilibrium and Kinetic Studies
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 708Zinc Adsorption Property of Gamma-MnO2...

Zinc Adsorption Property of Gamma-MnO₂ Nanostructure: Equilibrium and Kinetic Studies

Abstract:

In this work, gamma–MnO₂ nanostructure was used as a sorbent to remove Zn (II) ion from aqueous solution. The influence of pH, sorption time and Zn (II) ion initial concentration were examined. The results showed that equilibrium adsorption was obtained after 60 minutes with 240 rpm of shaking speed at pH = 4.0. The experimental data were analyzed using five non-linear isotherm models: Langmuir, Freundlich, Sips, Tempkin and Dubinin – Radushkevich. The adsorption capacity (qm) from the Langmuir isotherm model for Zn (II) is founded as 55.23 mg/g. The heat of sorption process and the mean free energy were estimated from Temkin and Dubinin – Redushkevich isotherm models to be less than 8 kj/mol which vividly proved that the adsorption experiment followed a physical process. Kinetic studies have shown that although the adsorption data partially followed pseudo-first-order and pseudo-second-order equation for different time, it was well expressed by pseudo-second-order model.

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Key Engineering Materials (Volume 708)

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3-8

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https://doi.org/10.4028/www.scientific.net/KEM.708.3

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September 2016

Authors:

Van Phuc Dinh*, Ngoc Chung Le, Thi Phuong Tu Nguyen, Thi Dong Thuong Hoang, Van Dong Nguyen, Ngoc Tuan Nguyen

Keywords:

Adsorption, Isotherm, Kinetic, Zinc, γ-MnO Nanostructrure

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