Advances in application of cotton-based adsorbents for heavy metals trapping, surface modifications and future perspectives

Ecotoxicology and Environmental Safety
Kovo G Akpomie, Jeanet Conradie

Abstract

Cotton-based adsorbents (CBAs) are promising materials for combating the problem of heavy metal pollution of environmental waters. This is ascribed to the low cost, abundance, biodegradability and efficiency of CBAs. Herein we review the adsorption of heavy metals (HMs) onto CBAs. We found that several surface modifications were employed to improve the efficiency of the CBAs. These modifications were effected via thermal, physical and chemical means to obtain activated carbons, biochars, ionic liquids, aerogels, hydrogels, chitosans and nanoparticle-derived CBAs. The CBAs exhibited maximum HMs uptake as low as 0.002 mg/g to as high as 505.6 mg/g. Although, the cotton-derived activated carbons and biochars exhibited enhanced HM uptake from that of the unmodified CBAs, they were less efficient than CBAs modified by other methods. Recent chemical, ionic liquid, chitosan and nano-derived CBAs were the most efficient, with high uptake and fast kinetic removal. However, the nanoparticle-based adsorbents are preferred to the chemically modified forms, due to the possibility of secondary pollution and the noxious effect of the latter to the environment. Findings showed that chemical treatment produced CBAs most efficient for As(V), Pb(...Continue Reading

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Citations

Sep 9, 2020·International Journal of Phytoremediation·Kovo G Akpomie, Jeanet Conradie
Jan 17, 2021·Environmental Science and Pollution Research International·Kovo G Akpomie, Jeanet Conradie
Oct 15, 2021·Analytical Methods : Advancing Methods and Applications·Deonir AgustiniDosil Pereira de Jesus

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