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Title: Heterogeneous Lead Phosphate Nucleation at Organic–Water Interfaces: Implications for Lead Immobilization

Journal Article · · ACS Earth and Space Chemistry
 [1];  [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [1]
  1. Univ. of Houston, TX (United States). Dept. of Civil & Environmental Engineering
  2. Washington Univ., St. Louis, MO (United States). Dept. of Energy, Environmental and Chemical Engineering
  3. Washington Univ., St. Louis, MO (United States). Dept. of Earth and Planetary Sciences
  4. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division

Phosphate is added to Pb-contaminated soils to induce lead immobilization through lead phosphate precipitation. Organic coatings on soils, which may affect heterogeneous lead phosphate nucleation, can impact the effectiveness of lead immobilization. SiO2 surfaces were coated with silanol self-assembled thin films terminated with -COOH and -OH functional groups to act as model organic coatings on soil particles. Using grazing incidence small-angle X-ray scattering (GISAXS), heterogeneous lead phosphate nucleation on coatings was measured from mixed Pb(NO3)2 and Na2HPO4/NaH2PO4 solutions at pH 7 with varied ionic strengths (IS = 0.58, 4, and 11 mM). Raman spectroscopy identified the homogeneous precipitates in solution as hydroxylpyromorphite (Pb5(PO4)3OH). The smallest lead phosphate nuclei (4.5 ± 0.5 nm) were observed on -COOH coatings, which resulted from the highest level of lead and phosphate ion adsorption on -COOH coatings. The IS of the solution also affected the sizes of the heterogeneous precipitates on -COOH coating, with smaller nuclei (1.3 ± 0.4 nm) forming under higher IS (4 and 11 mM). Finally, this study provided new findings that can improve our understanding of lead immobilization in contaminated soil environments.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Houston, TX (United States); Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; 1604042; 1603717
OSTI ID:
1484682
Journal Information:
ACS Earth and Space Chemistry, Vol. 2, Issue 9; ISSN 2472-3452
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (3)

Organic–mineral interfacial chemistry drives heterogeneous nucleation of Sr-rich (Ba x , Sr 1− x )SO 4 from undersaturated solution journal May 2019
Advanced chemical stability diagrams to predict the formation of complex zinc compounds in a chloride environment journal January 2019
Preventing the colloidal dispersion of Pb( iv ) corrosion scales and lead release in drinking water distribution systems journal January 2019

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