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Carbon nanotube-based adsorbents for the removal of dyes from waters: A review

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Abstract

Contamination of water is calling for new techniques to provide safe and clean water for drinking and other usages. Among existing techniques of wastewater treatment, adsorption is one of the most efficient methods. Recently, carbon nanotube-based adsorbents are attracting research and industrial attention due to their large surface area, cylindrical hollow structure and well-flourished mesopores. Raw carbon nanotubes can be modified and adapted to the intended applications and targeted pollutants. Here we review the efficacy of unmodified and modified carbon nanotubes for the removal of dyes from wastewater. Reports show that chemical modification leads to an improvement of the adsorption capacity. The adsorption of dyes on carbon nanotubes depends on the nature of the adsorbent and adsorbate. Adsorption mechanisms involve van der Waals forces, π–π stacking, hydrophobic interactions, hydrogen bonding and electrostatic interactions. Nonetheless, hydrophobicity and cost actually restrict practical applications.

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Acknowledgements

The authors thankfully acknowledge the Chairperson of the Department of Applied Chemistry, Aligarh Muslim University, for providing necessary facilities.

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Correspondence to Inamuddin.

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Mashkoor, F., Nasar, A. & Inamuddin Carbon nanotube-based adsorbents for the removal of dyes from waters: A review. Environ Chem Lett 18, 605–629 (2020). https://doi.org/10.1007/s10311-020-00970-6

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  • DOI: https://doi.org/10.1007/s10311-020-00970-6

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