Oxidized multiwalled carbon nanotubes as adsorbent for the removal of manganese from aqueous solution.

Environmental Science and Pollution Research International
Pandian GanesanSubramanyan Vasudevan

Abstract

A batch adsorption process was applied to investigate the removal of manganese from aqueous solution by oxidized multiwalled carbon nanotubes (MWCNTs). In doing so, the thermodynamic, adsorption isotherm, and kinetic studies were also carried out. MWCNT with 5-10-nm outer diameter, surface area of 40-600 m(2)/g, and purity above 95 % was used as an adsorbent. A systematic study of the adsorption process was performed by varying pH, ionic strength, and temperature. Manganese-adsorbed MWCNT was characterized by Raman, FTIR, X-ray diffraction, XPS, SEM, and TEM. The adsorption efficiency could reach 96.82 %, suggesting that MWCNT is an excellent adsorbent for manganese removal from water. The results indicate that second-order kinetics model was well suitable to model the kinetic adsorption of manganese. Equilibrium data were well described by the typical Langmuir adsorption isotherm. Thermodynamic studies revealed that the adsorption reaction was spontaneous and endothermic process. The experimental results showed that MWCNT is an excellent manganese adsorbent. The MWCNTs removed the manganese present in the water and reduced it to a permissible level making it drinkable.

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Citations

May 15, 2015·Environmental Science and Pollution Research International·Lili GaoDihua Wang
May 5, 2018·Environmental Science and Pollution Research International·Adeyinka S YusuffJima F Ngochindo
Oct 14, 2018·Environmental Science and Pollution Research International·Zhuo ZhaoHongliang Zhang
Jan 2, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Carolina Rodríguez, Eduardo Leiva
Aug 21, 2018·Environmental Technology·Saeideh Omranpour ShahrezaSanaz Behnam

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