Geochemistry of carbon nanotube assemblages in coal fire soot, Ruth Mullins fire, Perry County, Kentucky

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• 作者：Luis F.O. Silva^a ; Marcos L.S. Oliveira^a ; Vivian Philippi^a ; ^{felipeqma@yahoo.com.br} ; Carmen Serra^b ; Shifeng Dai^c ; Weifeng Xue^c ; Wenmei Chen^c ; Jennifer M.K. O'Keefe^d ; Christopher S. Romanek^e ; Shelley G. Hopps^f ; James C. Hower^f ; ^{james.hower@uky.edu}
• 关键词：Arsenic ; Selenium ; Mercury ; Coal ; Nanotube
• 刊名：International Journal of Coal Geology
• 出版年：2012
• 期刊代码：24_01665162
• 类别：pw
• 出版时间：1 May, 2012
• 卷：94
• 期：Complete
• 页码：206-213
• 文件大小：1390 K

摘要

Coal fires typically generate a variety of mineral and organic deposits associated with the venting emission gases. In addition to the tars typically found at the Ruth Mullins coal fire, Perry County, Kentucky, a sooty carbon, superficially similar to a carbon from a university-based stoker-fired power plant, was sampled in an August 2010 visit. Carbons in the soot include complex carbon particles, nanotubes encapsulating Hg, onion-like structures with polyhedral and quasi-spherical morphology with hollow centers, and metal-bearing multiwalled nanotubes. Mineral and amorphous inorganic phases included glassy Al-Si spheres with associated Pb and Se; nanopyrite grains with trace As and Se; nanohematite with V³⁺; salammoniac; quartz; Cr- and Pb-bearing jarosite; fibrous pickeringite with surficial natrojarosite; and Cd-, Co-, Mo-, Ni, V-, W-, and Zr-bearing nanospheres. The enrichment of ¹⁵N in the soot is associated with the fractionation of NH₃ to NH₄ in the formation of salammoniac. Selenium, Pb, and Zn are found in relatively high concentrations in the soot and Hg, with 5.68 ppm, has a higher concentration than any Kentucky fly ash.