Nanometer-Scale Chemical Heterogeneities of Black Carbon Materials and Their Impacts on PCB Sorption Properties:Soft X-ray Spectromicroscopy Study

TAE HYUN YOON; KARIM BENZERARA; SUNGWOO AHN

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Nanometer-Scale Chemical Heterogeneities of Black Carbon Materials and Their Impacts on PCB Sorption Properties:Soft X-ray Spectromicroscopy Study

机译：黑碳材料的纳米级化学异质性及其对PCB吸附性能的影响：软X射线光谱学研究

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Synchrotron-based soft X-ray spectromicroscopy was used to probe nanometer-scale chemical heterogeneities of black carbon (BC)materials,including anthracite coal,coke,and activated carbon (AC),and to study their impact on the partitioning of one type of polychlorinated biphenyls (PCB-166:2,3,4,4',5,6 hexachloro biphenyl)onto AC particles.Various carbon species (e.g.,aromatic,ketonic/phenolic,and carboxylic functional groups)were found in all of the BC materials examined,and impurities (e.g.,carbonate and potassium ions in anthracite coal)were identified in nanometer-scale regions of these samples.We show that these chemical heterogeneities in AC particles influence their sorption of hydrophobic organic compounds (HOCs).PCB-166 was found to accumulate preferentially on AC particles with the highest content of aromatic functionalities.These new findings from X-ray spectromicroscopy have the following implications for the role of BC materials in the environment:(1)the functional groups of BC materials vary on a 25-nanometer scale,and so does the abundance of the HOCs;(2)molecular-level characterization of HOC sorption preferences on AC will lead to an improved understanding of AC sorption properties for the remediation of HOCs in soils and sediments.

机译：基于同步加速器的软X射线光谱显微镜可探测无烟煤，焦炭和活性炭（AC）等黑碳（BC）材料的纳米级化学异质性，并研究它们对一种类型的碳黑分配的影响。在AC颗粒上的多氯联苯（PCB-166：2,3,4,4'，5,6六氯联苯）。在所有卑诗省均发现了各种碳物种（例如芳族，酮/酚和羧基官能团）在这些样品的纳米级区域中确定了所检查的材料以及杂质（例如无烟煤中的碳酸盐和钾离子）。我们证明了AC颗粒中的这些化学异质性会影响其对疏水性有机化合物（HOC）的吸附。PCB-166 X射线光谱学的这些新发现对BC材料在环境中的作用具有以下影响：（1）碳纳米管的官能团BC材料在25纳米尺度上变化，HOC的丰度也随之变化;（2）HOC在AC上的吸附偏好的分子水平表征将导致人们对AC吸附特性的更好理解，以修复土壤和土壤中的HOC。沉积物。

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来源
《Environmental Science & Technology》 |2006年第19期|p.5923-5929|共7页
作者
TAE HYUN YOON; KARIM BENZERARA; SUNGWOO AHN;
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作者单位

Surface & Aqueous Geochemistry Group,Department of Geological & Environmental Sciences,Stanford University,Stanford,California 94305-2115,Department of Chemistry,Hanyang University,17 Haengdang-dong,Seongdong-gu,Seoul,133-791,Korea,Laboratoire de Min;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
中图分类环境化学;
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Nanometer-Scale Chemical Heterogeneities of Black Carbon Materials and Their Impacts on PCB Sorption Properties:Soft X-ray Spectromicroscopy Study

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