TY - JOUR
T1 - Liquid filtration of nanoparticles through track-etched membrane filters under unfavorable and different ionic strength conditions
T2 - Experiments and modeling
AU - Lee, Handol
AU - Segets, Doris
AU - Süß, Sebastian
AU - Peukert, Wolfgang
AU - Chen, Sheng Chieh
AU - Pui, David Y.H.
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/2/15
Y1 - 2017/2/15
N2 - Nanoparticle deposition experiments under unfavorable conditions were conducted experimentally and theoretically. The 0.2 and 0.4 µm rated track-etched membrane filters were challenged with 60, 100, 147, 220, 350 and 494 nm polystyrene latex (PSL) particles with different ionic strengths ranging from 0.005 to 0.05 M. The capillary tube model, with replacing the viscosity of air to water, was used to estimate the initial efficiency, or the transport efficiency of the particles to the filter surface, which was corrected in a second step by allowing the detachment of the nanoparticles according to the sum of adhesive and hydrodynamic torques. The adhesive torques were derived from surface interactions accessed by the extended DLVO theory. Calculation results showed that the adhesive torque of a particle located in the calculated primary minimum was slightly larger than the hydrodynamic torque, resulting in particle deposition. However, experimental data clearly indicated that detachment occurred. This could only be explained by the presence of additional hydration forces, leading to a larger separation which became relevant at high ionic strengths. By including hydration into our theoretical framework, experiment and theory were in very good agreement under all different ionic strength conditions. The findings allow a basic understanding of surface interactions between nanoparticles and membranes in micro- and ultra-filtration applications for drinking water production, wastewater treatment and particle free water production in industries.
AB - Nanoparticle deposition experiments under unfavorable conditions were conducted experimentally and theoretically. The 0.2 and 0.4 µm rated track-etched membrane filters were challenged with 60, 100, 147, 220, 350 and 494 nm polystyrene latex (PSL) particles with different ionic strengths ranging from 0.005 to 0.05 M. The capillary tube model, with replacing the viscosity of air to water, was used to estimate the initial efficiency, or the transport efficiency of the particles to the filter surface, which was corrected in a second step by allowing the detachment of the nanoparticles according to the sum of adhesive and hydrodynamic torques. The adhesive torques were derived from surface interactions accessed by the extended DLVO theory. Calculation results showed that the adhesive torque of a particle located in the calculated primary minimum was slightly larger than the hydrodynamic torque, resulting in particle deposition. However, experimental data clearly indicated that detachment occurred. This could only be explained by the presence of additional hydration forces, leading to a larger separation which became relevant at high ionic strengths. By including hydration into our theoretical framework, experiment and theory were in very good agreement under all different ionic strength conditions. The findings allow a basic understanding of surface interactions between nanoparticles and membranes in micro- and ultra-filtration applications for drinking water production, wastewater treatment and particle free water production in industries.
KW - Adhesive and hydrodynamic torque
KW - Derjaguin-Landau-Verwey-Overbeek (DLVO) theory
KW - Microfiltration
KW - Short range hydration effects
KW - Track-etched polycarbonate membrane filter
UR - http://www.scopus.com/inward/record.url?scp=85002917966&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85002917966&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2016.11.023
DO - 10.1016/j.memsci.2016.11.023
M3 - Article
AN - SCOPUS:85002917966
SN - 0376-7388
VL - 524
SP - 682
EP - 690
JO - Journal of Membrane Science
JF - Journal of Membrane Science
ER -