Removal Kinetics of Chromium by Nano-Magnetite in Different Environments of Groundwater
Publication: Journal of Environmental Engineering
Volume 146, Issue 2
Abstract
Chromium (Cr) is a toxic contaminant and ubiquitously present in the environment. This study was conducted to investigate the removal of Cr by nano-magnetite () in different biogeochemical environments of groundwater. Size of used was in the range of 50–100 nm, and it contained Fe (58.88%) and O (31.13%). Removal rates of total Cr () by were significantly improved () as the concentrations of were increased (). However, removal rates of by were decreased () as the concentrations of increased (). In addition, the removal rate of by was significantly increased () as the pH increased (pH 5.5–pH 9). Removal rates of by were significantly decreased () as the concentrations of humic acid (HA) increased (). This study revealed that the reactive surface of plays an important role to enhance maximum removal of . The surface charge of with or without is directly related to the reactive surface area of , which has not been well reported in the literature. Chemisorption reaction mechanisms may occur during the removal kinetics of by . Experimental findings from this study proved that has the capability to remove and provided fundamental knowledge on the potential reaction mechanisms of removal by .
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
This study was funded by Universiti Teknologi MARA (600-IRMI/MYRA 5/3/LESTARI (0068/2016) through the project Removal of Heavy Metal by Iron Bearing Soil Mineral from Soil and Groundwater. The authors greatly acknowledge the Faculty of Civil Engineering for the analytical support, laboratory assistant, and research team members (myBioREC Members) and also Associate Professor Dr. Rheo Lamorena-Lim (Faculty of Chemistry, University of the Philippines) for her great support during the preparation of this manuscript.
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©2019 American Society of Civil Engineers.
History
Received: Dec 14, 2018
Accepted: Jun 4, 2019
Published online: Dec 6, 2019
Published in print: Feb 1, 2020
Discussion open until: May 6, 2020
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