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Title: Association of the sites of heavy metals with nanoscale carbon in a Kentucky electrostatic precipitator fly ash

Abstract

A combination of high-resolution transmission electron microscopy, scanning transmission electron microscopy, and electron energy-loss spectroscopy (HRTEM-STEM-EELS) was used to study fly ashes produced from the combustion of an eastern Kentucky coal at a southeastern-Kentucky wall-fired pulverized coal utility boiler retrofitted for low-NOx combustion. Fly ash was collected from individual hoppers in each row of the electrostatic precipitators (ESP) pollution-control system, with multiple hoppers sampled within each of the three rows. Temperatures within the ESP array range from about 200 {degree}C at the entry to the first row to <150{degree}C at the exit of the third row. HRTEM-STEM-EELS study demonstrated the presence of nanoscale (10 s nm) C agglomerates with typical soot-like appearance and others with graphitic fullerene-like nanocarbon structures. The minute carbon agglomerates are typically juxtaposed and intergrown with slightly larger aluminosilicate spheres and often form an ultrathin halo or deposit on the fly ash particles. The STEM-EELS analyses revealed that the nanocarbon agglomerates host even finer (<3 nm) metal and metal oxide particles. Elemental analysis indicated an association of Hg with the nanocarbon. Arsenic, Se, Pb, Co, and traces of Ti and Ba are often associated with Fe-rich particles within the nanocarbon deposits. 57 refs., 5 figs.

Authors:
; ; ; ;  [1]
  1. University of Kentucky, Lexington, KY (United States). Center for Applied Energy Research
Publication Date:
OSTI Identifier:
21126091
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 42; Journal Issue: 22; Other Information: hower@caer.uky.edu; Journal ID: ISSN 0013-936X
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; USA; KENTUCKY; COAL; HOPPERS; FLY ASH; ELECTRON MICROSCOPY; SCANNING ELECTRON MICROSCOPY; COMBUSTION PRODUCTS; ELECTROSTATIC PRECIPITATORS; PULVERIZED FUELS; IMAGES; SPHEROIDS; BOILERS; NANOSTRUCTURES; FULLERENES; MORPHOLOGY; TRACE AMOUNTS; METALS; DEPOSITS; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Hower, James C, Graham, Uschi M, Dozier, Alan, Tseng, Michael T, and Khatri, Rajesh A. Association of the sites of heavy metals with nanoscale carbon in a Kentucky electrostatic precipitator fly ash. United States: N. p., 2008. Web. doi:10.1021/es801193y.
Hower, James C, Graham, Uschi M, Dozier, Alan, Tseng, Michael T, & Khatri, Rajesh A. Association of the sites of heavy metals with nanoscale carbon in a Kentucky electrostatic precipitator fly ash. United States. https://doi.org/10.1021/es801193y
Hower, James C, Graham, Uschi M, Dozier, Alan, Tseng, Michael T, and Khatri, Rajesh A. 2008. "Association of the sites of heavy metals with nanoscale carbon in a Kentucky electrostatic precipitator fly ash". United States. https://doi.org/10.1021/es801193y.
@article{osti_21126091,
title = {Association of the sites of heavy metals with nanoscale carbon in a Kentucky electrostatic precipitator fly ash},
author = {Hower, James C and Graham, Uschi M and Dozier, Alan and Tseng, Michael T and Khatri, Rajesh A},
abstractNote = {A combination of high-resolution transmission electron microscopy, scanning transmission electron microscopy, and electron energy-loss spectroscopy (HRTEM-STEM-EELS) was used to study fly ashes produced from the combustion of an eastern Kentucky coal at a southeastern-Kentucky wall-fired pulverized coal utility boiler retrofitted for low-NOx combustion. Fly ash was collected from individual hoppers in each row of the electrostatic precipitators (ESP) pollution-control system, with multiple hoppers sampled within each of the three rows. Temperatures within the ESP array range from about 200 {degree}C at the entry to the first row to <150{degree}C at the exit of the third row. HRTEM-STEM-EELS study demonstrated the presence of nanoscale (10 s nm) C agglomerates with typical soot-like appearance and others with graphitic fullerene-like nanocarbon structures. The minute carbon agglomerates are typically juxtaposed and intergrown with slightly larger aluminosilicate spheres and often form an ultrathin halo or deposit on the fly ash particles. The STEM-EELS analyses revealed that the nanocarbon agglomerates host even finer (<3 nm) metal and metal oxide particles. Elemental analysis indicated an association of Hg with the nanocarbon. Arsenic, Se, Pb, Co, and traces of Ti and Ba are often associated with Fe-rich particles within the nanocarbon deposits. 57 refs., 5 figs.},
doi = {10.1021/es801193y},
url = {https://www.osti.gov/biblio/21126091}, journal = {Environmental Science and Technology},
issn = {0013-936X},
number = 22,
volume = 42,
place = {United States},
year = {Sat Nov 15 00:00:00 EST 2008},
month = {Sat Nov 15 00:00:00 EST 2008}
}