Adsorption and Hydraulic Conductivity Studies on Bentonite in Presence of Copper Solution
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 25, Issue 2
Abstract
The presence of toxic chemicals in landfill deteriorates the quality of liner material by affecting its adsorption capacity and hydraulic properties. In this study, the influence of various concentrations of copper will be examined on two bentonites with different mineralogical and chemical composition. A series of batch studies in the pH range of 2–8, scanning electron microscope (SEM), Fourier Transform Infrared (FTIR) analyses, isotherm study, and consolidation tests will be carried out to investigate the adsorption capacity, change in surface morphology, and hydraulic conductivity of the bentonites. It was observed that pH 5 was more effective in the removal of Cu2+. The test results indicated an adsorption capacity of 22.8 and 20.4 mg/g at 2,000 mg/L of Cu2+ solution for both bentonites. Furthermore, FTIR characterization of both bentonites in the presence and absence of Cu2+ confirmed the involvement of Si–O–Si stretching and water (−OH). From the SEM study, a change in surface morphology was witnessed for Cu2+ adsorbed bentonites. The isotherm study indicated that the Freundlich model closely fits the equilibrium data. The results revealed that hydraulic conductivity increased with the increase in copper concentration. Conclusive evidence suggested that bentonite with higher cation exchange capacity (CEC), swelling volume, and specific surface area (SSA) possessed a larger adsorption capacity and removal efficiency.
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Journal of Hazardous, Toxic, and Radioactive Waste
Volume 25 • Issue 2 • April 2021
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© 2020 American Society of Civil Engineers.
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Received: Jul 8, 2020
Accepted: Oct 14, 2020
Published online: Dec 7, 2020
Published in print: Apr 1, 2021
Discussion open until: May 7, 2021
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