Role of collector alternating charged patches on transport of cryptosporidium parvum oocysts in a patchwise charged heterogeneous micromodel

Yuanyuan Liu, Changyong Zhang, Dehong Hu, Mark S. Kuhlenschmidt, Theresa B. Kuhlenschmidt, Steven E. Mylon, Rong Kong, Rohit Bhargava, Thanh H. Nguyen

Research output: Contribution to journalArticle

Abstract

The role of collector surface charge heterogeneity on transport of Cryptosporidium parvum oocyst and carboxylate microsphere in 2-dimensional micromodels was studied. The cylindrical silica collectors within the micromodels were coated with 0, 10, 20, 50, and 100% Fe2O3 patches. The experimental values of average removal efficiencies (η) of the Fe2O3 patches and on the entire collectors were determined. In the presence of significant (>3500 kT) Derjaguin-Landau- Verwey-Overbeek (DLVO) energy barrier between the microspheres and the silica collectors at pH 5.8 and 8.1, η determined for Fe2O3 patches on the heterogeneous collectors were significantly less (p < 0.05, t test) than those obtained for collectors coated entirely with Fe 2O3. However, η calculated for Fe2O 3 patches for microspheres at pH 4.4 and for oocysts at pH 5.8 and 8.1, where the DLVO energy barrier was relatively small (ca. 200-360 kT), were significantly greater (p < 0.05, t test) than those for the collectors coated entirely with Fe2O3. The dependence of η for Fe 2O3 patches on the DLVO energy barrier indicated the importance of periodic favorable and unfavorable electrostatic interactions between colloids and collectors with alternating Fe2O3 and silica patches. Differences between experimentally determined overall η for charged heterogeneous collectors and those predicted by a patchwise geochemical heterogeneous model were observed. These differences can be explained by the model's lack of consideration for the spatial distribution of charge heterogeneity on the collector surface.

Original languageEnglish (US)
Pages (from-to)2670-2678
Number of pages9
JournalEnvironmental Science and Technology
Volume47
Issue number6
DOIs
StatePublished - Mar 19 2013

Fingerprint

Energy barriers
Microspheres
Silicon Dioxide
silica
energy
Colloids
Surface charge
colloid
Coulomb interactions
Spatial distribution
spatial distribution
test

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Role of collector alternating charged patches on transport of cryptosporidium parvum oocysts in a patchwise charged heterogeneous micromodel. / Liu, Yuanyuan; Zhang, Changyong; Hu, Dehong; Kuhlenschmidt, Mark S.; Kuhlenschmidt, Theresa B.; Mylon, Steven E.; Kong, Rong; Bhargava, Rohit; Nguyen, Thanh H.

In: Environmental Science and Technology, Vol. 47, No. 6, 19.03.2013, p. 2670-2678.

Research output: Contribution to journalArticle

@article{e8e4bcadaef54791b6e3330d557813f9,
title = "Role of collector alternating charged patches on transport of cryptosporidium parvum oocysts in a patchwise charged heterogeneous micromodel",
abstract = "The role of collector surface charge heterogeneity on transport of Cryptosporidium parvum oocyst and carboxylate microsphere in 2-dimensional micromodels was studied. The cylindrical silica collectors within the micromodels were coated with 0, 10, 20, 50, and 100{\%} Fe2O3 patches. The experimental values of average removal efficiencies (η) of the Fe2O3 patches and on the entire collectors were determined. In the presence of significant (>3500 kT) Derjaguin-Landau- Verwey-Overbeek (DLVO) energy barrier between the microspheres and the silica collectors at pH 5.8 and 8.1, η determined for Fe2O3 patches on the heterogeneous collectors were significantly less (p < 0.05, t test) than those obtained for collectors coated entirely with Fe 2O3. However, η calculated for Fe2O 3 patches for microspheres at pH 4.4 and for oocysts at pH 5.8 and 8.1, where the DLVO energy barrier was relatively small (ca. 200-360 kT), were significantly greater (p < 0.05, t test) than those for the collectors coated entirely with Fe2O3. The dependence of η for Fe 2O3 patches on the DLVO energy barrier indicated the importance of periodic favorable and unfavorable electrostatic interactions between colloids and collectors with alternating Fe2O3 and silica patches. Differences between experimentally determined overall η for charged heterogeneous collectors and those predicted by a patchwise geochemical heterogeneous model were observed. These differences can be explained by the model's lack of consideration for the spatial distribution of charge heterogeneity on the collector surface.",
author = "Yuanyuan Liu and Changyong Zhang and Dehong Hu and Kuhlenschmidt, {Mark S.} and Kuhlenschmidt, {Theresa B.} and Mylon, {Steven E.} and Rong Kong and Rohit Bhargava and Nguyen, {Thanh H.}",
year = "2013",
month = "3",
day = "19",
doi = "10.1021/es304075j",
language = "English (US)",
volume = "47",
pages = "2670--2678",
journal = "Environmental Science and Technology",
issn = "0013-936X",
publisher = "American Chemical Society",
number = "6",

}

TY - JOUR

T1 - Role of collector alternating charged patches on transport of cryptosporidium parvum oocysts in a patchwise charged heterogeneous micromodel

AU - Liu, Yuanyuan

AU - Zhang, Changyong

AU - Hu, Dehong

AU - Kuhlenschmidt, Mark S.

AU - Kuhlenschmidt, Theresa B.

AU - Mylon, Steven E.

AU - Kong, Rong

AU - Bhargava, Rohit

AU - Nguyen, Thanh H.

PY - 2013/3/19

Y1 - 2013/3/19

N2 - The role of collector surface charge heterogeneity on transport of Cryptosporidium parvum oocyst and carboxylate microsphere in 2-dimensional micromodels was studied. The cylindrical silica collectors within the micromodels were coated with 0, 10, 20, 50, and 100% Fe2O3 patches. The experimental values of average removal efficiencies (η) of the Fe2O3 patches and on the entire collectors were determined. In the presence of significant (>3500 kT) Derjaguin-Landau- Verwey-Overbeek (DLVO) energy barrier between the microspheres and the silica collectors at pH 5.8 and 8.1, η determined for Fe2O3 patches on the heterogeneous collectors were significantly less (p < 0.05, t test) than those obtained for collectors coated entirely with Fe 2O3. However, η calculated for Fe2O 3 patches for microspheres at pH 4.4 and for oocysts at pH 5.8 and 8.1, where the DLVO energy barrier was relatively small (ca. 200-360 kT), were significantly greater (p < 0.05, t test) than those for the collectors coated entirely with Fe2O3. The dependence of η for Fe 2O3 patches on the DLVO energy barrier indicated the importance of periodic favorable and unfavorable electrostatic interactions between colloids and collectors with alternating Fe2O3 and silica patches. Differences between experimentally determined overall η for charged heterogeneous collectors and those predicted by a patchwise geochemical heterogeneous model were observed. These differences can be explained by the model's lack of consideration for the spatial distribution of charge heterogeneity on the collector surface.

AB - The role of collector surface charge heterogeneity on transport of Cryptosporidium parvum oocyst and carboxylate microsphere in 2-dimensional micromodels was studied. The cylindrical silica collectors within the micromodels were coated with 0, 10, 20, 50, and 100% Fe2O3 patches. The experimental values of average removal efficiencies (η) of the Fe2O3 patches and on the entire collectors were determined. In the presence of significant (>3500 kT) Derjaguin-Landau- Verwey-Overbeek (DLVO) energy barrier between the microspheres and the silica collectors at pH 5.8 and 8.1, η determined for Fe2O3 patches on the heterogeneous collectors were significantly less (p < 0.05, t test) than those obtained for collectors coated entirely with Fe 2O3. However, η calculated for Fe2O 3 patches for microspheres at pH 4.4 and for oocysts at pH 5.8 and 8.1, where the DLVO energy barrier was relatively small (ca. 200-360 kT), were significantly greater (p < 0.05, t test) than those for the collectors coated entirely with Fe2O3. The dependence of η for Fe 2O3 patches on the DLVO energy barrier indicated the importance of periodic favorable and unfavorable electrostatic interactions between colloids and collectors with alternating Fe2O3 and silica patches. Differences between experimentally determined overall η for charged heterogeneous collectors and those predicted by a patchwise geochemical heterogeneous model were observed. These differences can be explained by the model's lack of consideration for the spatial distribution of charge heterogeneity on the collector surface.

UR - http://www.scopus.com/inward/record.url?scp=84875345449&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84875345449&partnerID=8YFLogxK

U2 - 10.1021/es304075j

DO - 10.1021/es304075j

M3 - Article

C2 - 23373745

AN - SCOPUS:84875345449

VL - 47

SP - 2670

EP - 2678

JO - Environmental Science and Technology

JF - Environmental Science and Technology

SN - 0013-936X

IS - 6

ER -