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Open AccessArticle

Removal of Chromium(VI) from Contaminated Water Using Untreated Moringa Leaves as Biosorbent

1
Chemical Engineering Department, Abu Dhabi University, P.O. Box 59911, Abu Dhabi, United Arab Emirates
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Chemical Engineering Department, University of Waterloo, Waterloo, ON N2L 3G1, Canada
*
Author to whom correspondence should be addressed.
Received: 3 February 2021 / Revised: 12 February 2021 / Accepted: 15 February 2021 / Published: 25 February 2021
(This article belongs to the Section Industrial Pollution)
Biosorption of chromium (Cr(VI)) is studied by using raw (chemically not modified) Moringa (Moringa Oleifera) leaf powder without any pretreatment. Cr(VI) is one of the potentially harmful heavy metals found in industrial wastewater. In the Moringa leaf powder, the presence of a significant amount of organic acids form the source for the biosorption of Cr(VI). The concentration of Cr(VI) in the feed solution is varied and different dosages of the proposed biosorbent are used to study its efficiency in the removal of Cr(VI). The concentration of Cr(VI) is varied from 1 ppm to 20 ppm while the amount of biosorbent is varied from 0.5 g to 2.5 g. The equilibrium time for adsorption of Cr(VI) is observed to vary between half an hour and 90 min. The metal removal efficiency varied from 30% to 90% which is a significant achievement compared to other conventional methods which are either energy-intensive or not cost effective. The experimental results are modeled using Langmuir, Freundlich and Redlich–Peterson isotherms. The metal removal efficiency is attributed to the chelating effect of carboxylate and hydroxyl groups present in the moringa leaves and is confirmed from the FTIR analysis. Further molecular docking simulations are performed to confirm the binding of the metal to the speculated sites within the different acids present in the moringa leaves. Untreated green moringa leaf powder used as a biosorbent in this study leads to a sustainable and cheaper option for treating wastewater containing Cr(VI). View Full-Text
Keywords: biosorption; chromium removal; moringa; adsorption isotherms; molecular docking biosorption; chromium removal; moringa; adsorption isotherms; molecular docking
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MDPI and ACS Style

Madhuranthakam, C.M.R.; Thomas, A.; Akhter, Z.; Fernandes, S.Q.; Elkamel, A. Removal of Chromium(VI) from Contaminated Water Using Untreated Moringa Leaves as Biosorbent. Pollutants 2021, 1, 51-64. https://0-doi-org.brum.beds.ac.uk/10.3390/pollutants1010005

AMA Style

Madhuranthakam CMR, Thomas A, Akhter Z, Fernandes SQ, Elkamel A. Removal of Chromium(VI) from Contaminated Water Using Untreated Moringa Leaves as Biosorbent. Pollutants. 2021; 1(1):51-64. https://0-doi-org.brum.beds.ac.uk/10.3390/pollutants1010005

Chicago/Turabian Style

Madhuranthakam, Chandra M.R.; Thomas, Archana; Akhter, Zhainab; Fernandes, Shannon Q.; Elkamel, Ali. 2021. "Removal of Chromium(VI) from Contaminated Water Using Untreated Moringa Leaves as Biosorbent" Pollutants 1, no. 1: 51-64. https://0-doi-org.brum.beds.ac.uk/10.3390/pollutants1010005

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