Effect of natural aquatic colloids on Cu(II) and Pb(II) adsorption by Al2O3 nanoparticles

•Size fractionation and characterization of natural aquatic colloids.•Metal adsorption by Al2O3 NPs is pH-dependent due to its complexation with AlOH.•Colloidal organic matter significantly facilitated metal adsorption.•Aquatic colloids affected metal adsorption via changing surface properties of Al...

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Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2013-06, Vol.225, p.464-473
Main Authors: Sun, Weiling, Yin, Kun, Yu, Xiangquan
Format: Article
Language:English
Subjects:
Adsorption
Aluminum oxide
Aluminum oxide nanoparticles
Aquatic colloids
Colloids
Composition effects
Cu(II)/Pb(II)
Dissolution
Nanoparticles
Rivers
Surface chemistry
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container_title Chemical engineering journal (Lausanne, Switzerland : 1996)
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description •Size fractionation and characterization of natural aquatic colloids.•Metal adsorption by Al2O3 NPs is pH-dependent due to its complexation with AlOH.•Colloidal organic matter significantly facilitated metal adsorption.•Aquatic colloids affected metal adsorption via changing surface properties of Al2O3. The effect of aquatic colloids on Cu(II) and Pb(II) adsorption by Al2O3 nanoparticles (NPs) was investigated, and particular attention was paid to the relationship between the composition of the colloids and metal adsorption by Al2O3 NPs. The water samples collected from the Wenyu River and the Yellow River were separated into four fractions (1–0.22μm, 0.22–0.006μm, 0.006–0.003μm,
doi_str_mv 10.1016/j.cej.2013.04.010
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The effect of aquatic colloids on Cu(II) and Pb(II) adsorption by Al2O3 nanoparticles (NPs) was investigated, and particular attention was paid to the relationship between the composition of the colloids and metal adsorption by Al2O3 NPs. The water samples collected from the Wenyu River and the Yellow River were separated into four fractions (1–0.22μm, 0.22–0.006μm, 0.006–0.003μm, &lt;0.003μm) using cross-flow filtration. The uptake of Cu(II) or Pb(II) by Al2O3 NPs in the dissolved solution was pH-dependent, governed mainly by the surface complexation of AlOH and metals. Due to the differences in colloidal organic matter contents, the Cu(II) and Pb(II) adsorption onto Al2O3 NPs was promoted significantly (p&lt;0.05) by aquatic colloids of the Wenyu River, while different results were observed for the Yellow River. The zeta potential and particle size of Al2O3 NPs were changed due to the adsorption of aquatic colloids, which affected the metal adsorption. 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1873-3212
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subjects Adsorption
Aluminum oxide
Aluminum oxide nanoparticles
Aquatic colloids
Colloids
Composition effects
Cu(II)/Pb(II)
Dissolution
Nanoparticles
Rivers
Surface chemistry
title Effect of natural aquatic colloids on Cu(II) and Pb(II) adsorption by Al2O3 nanoparticles
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