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TiO2 nanoparticle transport and retention through saturated limestone porous media under various ionic strength conditions

Bayat, Ali Esfandyari and Junin, Radzuan Bin and Derahman, Mohd. Nawi Awi and Samad, Adlina Abdul (2015) TiO2 nanoparticle transport and retention through saturated limestone porous media under various ionic strength conditions. Chemosphere, 134 . pp. 7-15. ISSN 0045-6535

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Official URL: http://dx.doi.org/10.1016/j.chemosphere.2015.03.05...

Abstract

The impact of ionic strength (from 0.003 to 500mM) and salt type (NaCl vs MgCl2) on transport and retention of titanium dioxide (TiO2) nanoparticles (NPs) in saturated limestone porous media was systematically studied. Vertical columns were packed with limestone grains. The NPs were introduced as a pulse suspended in aqueous solutions and breakthrough curves in the column outlet were generated using an ultraviolent-visible spectrometry. Presence of NaCl and MgCl2 in the suspensions were found to have a significant influence on the electrokinetic properties of the NP aggregates and limestone grains. In NaCl and MgCl2 solutions, the deposition rates of the TiO2-NP aggregates were enhanced with the increase in ionic strength, a trend consistent with traditional Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Furthermore, the NP aggregates retention increased in the porous media with ionic strength. The presence of salts also caused a considerable delay in the NPs breakthrough time. MgCl2 as compared to NaCl was found to be more effective agent for the deposition and retention of TiO2-NPs. The experimental results followed closely the general trends predicted by the filtration and DLVO calculations. Overall, it was found that TiO2-NP mobility in the limestone porous media depends on ionic strength and salt type.

Item Type:Article
Uncontrolled Keywords:ionic strength, limestone porous media
Subjects:Q Science > QC Physics
Divisions:Petroleum and Renewable Energy Engineering
ID Code:59028
Deposited By: Haliza Zainal
Deposited On:04 Dec 2016 12:07
Last Modified:01 Feb 2017 14:52

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