Photochemically induced decarboxylation in diesel soot extracts

被引：16

作者：

Braun, A.

Wirick, A.

Kubatova, A.

Mun, B. S.

Huggins, F. E.

机构：

[1] Univ Kentucky, Dept Mat & Chem Engn, Lexington, KY 40506 USA

[2] SUNY Stony Brook, Dept Phys, Stony Brook, NY 11794 USA

[3] Univ N Dakota, Energy & Environm Res Ctr, Grand Forks, ND 58202 USA

[4] Ernest Orlando Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

来源：

ATMOSPHERIC ENVIRONMENT | 2006年 / 40卷 / 30期

基金：

美国国家科学基金会;

关键词：

NEXAFS spectroscopy; diesel soot extract; decarboxylation; photolysis;

D O I：

10.1016/j.atmosenv.2006.05.024

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Aqueous extracts from diesel engine exhaust particulate matter (soot) obtained by hot pressurized water extraction were subject to near-edge X-ray absorption fine structure (NEXAFS) spectroscopy with respect to the carbon K (1 s) absorption edge at a synchrotron radiation source. The highly intense X-ray beam caused a significant decrease of the carboxyl peak intensity at 288 eV, to the benefit of a newly arising carbonate peak at 291.2eV. The same phenomenon was found in alginic acid when exposed to the same conditions. With knowledge of the molecular structure of alginic acid, we are able to propose a simple photochemical reaction scenario that describes a decay path for carboxyl in soot: the radiolysis of carboxylate into carbonate in diesel soot during irradiation. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：5837 / 5844

页数：8

共 35 条

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