Assessing Synergistic Ultrafiltration Membrane Fouling by TiO2 Nanoparticles and Humic Acid Using Interaction Energy Analysis
Lin Tian1, Chunyi Sun1, Fengkai Sun2, RuiQiang Zong3, Shuang Liang1
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1Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science
and Engineering, Shandong University, Jinan 250100, China
2Shandong Daojian Environmental Protection Technology Co., Ltd. Jinan 250014, China
3Department of Environmental Engineering, Texas A&M University, Kingsville 700 University Boulevard,
Kingsville, TX 78363-8202, USA
Submission date: 2017-03-05
Acceptance date: 2017-04-05
Online publication date: 2017-08-28
Publication date: 2017-09-28
Pol. J. Environ. Stud. 2017;26(5):2259-2266
This research attempts to elucidate the effect of humic acid (HA) on TiO2 nanoparticle ultrafiltration (UF) membrane fouling, and quantitatively analyze the synergistic membrane fouling mechanisms using interaction energies. The extended Derjaguin-Landau-Verwey-Overbeek (xDLVO) theory was employed to analyze the interaction energies and predict UF membrane fouling. Membrane fouling effects were studied during the dead-end filtration of individual TiO2 and HA-TiO2 mixtures using two kinds of polymeric UF membranes. It was found that HA-TiO2 mixtures lead to greater flux declines than individual TiO2. For specific foulant, the hydrophobic PVDF membrane showed relative severe membrane fouling than hydrophilic PES membrane. As for the HA-TiO2 mixture, much higher irreversible fouling was observed compared with that of individual TiO2. Moreover, this study highlights the importance of HA concentration in synergistic fouling effects of the HA-TiO2 mixture. The increase of HA concentration caused an increase of contact angle and lower interaction energy, thus aggravating membrane fouling. Results illustrated that synergistic membrane fouling by TiO2 and HA could be successfully explained using the xDLVO analysis. The extent of membrane fouling turned out to be dominated by Lewis acid-base interaction.
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