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Volume 41 Issue 1 February 2018 Article ID 0006
Lead ions removal from aqueous solution using modified carbon nanotubes
NGUYEN DUC VU QUYEN TRAN NGOC TUYEN DINH QUANG KHIEU HO VAN MINH HAI DANG XUAN TIN PHAM THI NGOC LAN ITATANI KIYOSHI
Surface-modified carbon nanotubes (CNTs) were prepared in order to remove lead ions (Pb$^{2+}$) from aqueoussolution. The modification of CNTs was conducted by oxidation, using a mixture of nitric acid (HNO$_3$) and sulphuric acid(H$_2$SO$_4$). The adsorption behaviour was well fitted to the Langmuir model and the maximum adsorption capacity of Pb$^{2+}$ was found to be 100 mg g$^{−1}$. The adsorption of Pb$^{2+}$ reached equilibrium in 80 min. The experimental data were well fitted to a pseudo-second-order rate model rather than a pseudo-first-order model. The activation energy and activation enthalpy of the adsorption calculated from Arrhenius and Eyring equations were, respectively, 21.08 and 18.56 kJ mol$^{−1}$, which reflect the outside surface adsorption and ion exchange mechanism. The thermodynamical studies showed that the adsorption of Pb$^{2+}$ was a spontaneous and endothermic process. The ion exchange mechanism of Pb$^{2+}$ removal was confirmed by the pH and electrical conductivity data in solution before and after adsorption.
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Bulletin of Materials Science
Volume 46, 2023
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Continuous Article Publishing mode
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Bulletin of Materials Science | News
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020 -
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Posted on July 25, 2019Click here for Editorial Note on CAP Mode
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