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Soil Science Society of America Journal Abstract - Soil Chemistry

Facilitated Transport of Copper with Hydroxyapatite Nanoparticles in Saturated Sand

 

This article in SSSAJ

  1. Vol. 76 No. 2, p. 375-388
     
    Received: June 3, 2011


    * Corresponding author(s): dmzhou@issas.ac.cn
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doi:10.2136/sssaj2011.0203
  1. Dengjun Wanga,
  2. Scott A. Bradfordb,
  3. Marcos Paradeloc,
  4. Willie J.G.M. Peijnenburgd and
  5. Dongmei Zhou *e
  1. a Key Lab. of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of Sciences No. 71 East Beijing Rd. Nanjing 210008, China and Graduate School of the Chinese Academy of Sciences Beijing 100049, China
    b USDA-ARS U.S. Salinity Lab. 450 W. Big Springs Rd. Riverside, CA 92507
    c Soil Science Group Dep. of Plant Biology and Soil Science Faculty of Sciences Univ. of Vigo Ourense E-32004, Spain
    d Lab. of Ecological Risk Assessment National Institute of Public Health and the Environment P.O. Box 1 3720 BA Bilthoven, the Netherlands and Institute of Environmental Sciences Leiden Univ. P.O. Box 9518 2300 RA Leiden, the Netherlands
    e Key Lab. of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of Sciences No. 71 East Beijing Rd. Nanjing 210008, China

Abstract

Saturated packed column experiments were conducted to investigate the facilitated transport of Cu with hydroxyapatite nanoparticles (nHAP) at different pore water velocities (0.22–2.2 cm min−1), solution pH (6.2–9.0), and fraction of Fe oxide coating on grain surfaces (λ, 0–0.36). The facilitated transport of Cu by nHAP (nHAP-F Cu) was found to increase with decreasing nHAP retention and decreasing transport of dissolved Cu. In particular, nHAP-F Cu transport increased with pH (8.0, 8.5, and 9.0) and especially λ (0.07–0.36) but was less significant than dissolved Cu transport at lower pH (6.2 and 7.0). The transport of dissolved Cu decreased with pH and λ because of increased Cu sorption or precipitation. The nHAP retention decreased with velocity, pH, and decreasing λ. Scanning electron microscope images revealed that nHAP retention at pH 7.0 was controlled by surface roughness and nHAP aggregation, whereas measured zeta potentials indicate that attachment of the nHAP occurred on the Fe oxide coated grains. The retention profiles of nHAP exhibited a hyperexponential shape, with greater retention in the section adjacent to the column inlet and rapidly decreasing retention with depth for all of the considered pH and λ conditions, but tended to become more exponential in shape at a higher velocity. These observations suggest that hyperexponential profiles are a general phenomenon of unfavorable attachment conditions that is sensitive to the hydrodynamics at the column inlet.

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