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DOI | 10.1073/pnas.1804481115 |
Role of elemental carbon in the photochemical aging of soot | |
Li, Meng1,2; Bao, Fengxia1,2; Zhang, Yue1,2; Song, Wenjing1,2; Chen, Chuncheng1,2; Zhao, Jincai1,2 | |
2018-07-24 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:30页码:7717-7722 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Soot, which consists of organic carbon (OC) and elemental carbon (EC), is a significant component of the total aerosol mass in the atmosphere. Photochemical oxidation is an important aging pathway for soot. It is commonly believed that OC is photoactive but EC, albeit its strong light absorption, is photochemically inert. Here, by taking advantage of the different light absorption properties of OC and EC, we provide direct experimental evidence that EC also plays an important role in the photochemical aging of soot by initiating the oxidation of OC, even under red light irradiation. We show that nascent soot, in addition to undergoing photochemical oxidation under blue light with a wavelength of 440 nm, undergoes similar oxidation under red light irradiation of lambda = 648 nm (L-648). However, separated OC (extracted from soot by n-hexane) and EC exhibit little reactivity under L-648. These observations indicate that EC plays a pivotal role in photoaging of soot by adsorbing light to initiate the oxidation of OC. Comparison of in situ IR spectra and photoelectrochemical behaviors suggests that EC-initiated photooxidation of OC proceeds through an electron transfer pathway, which is distinct from the photoaging induced by light absorption of OC. Since the absorption spectra of EC have a much larger overlap with the solar spectra than those of OC, our results provide insight into the chemical mechanism leading to rapid soot aging by organic species observed from atmospheric field measurements. |
英文关键词 | soot photochemistry aging elemental carbon |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000439574700049 |
WOS关键词 | HYDROCARBON FLAME SOOT ; HETEROGENEOUS REACTION ; ORGANIC-CARBON ; BLACK CARBON ; HEXANE SOOT ; SIMULATED SUNLIGHT ; OPTICAL-PROPERTIES ; QUANTUM DOTS ; KNUDSEN CELL ; DIESEL SOOT |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204956 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Chinese Acad Sci, Inst Chem, Res Educ Ctr Excellence Mol Sci, Key Lab Photochem, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Chem Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Li, Meng,Bao, Fengxia,Zhang, Yue,et al. Role of elemental carbon in the photochemical aging of soot[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(30):7717-7722. |
APA | Li, Meng,Bao, Fengxia,Zhang, Yue,Song, Wenjing,Chen, Chuncheng,&Zhao, Jincai.(2018).Role of elemental carbon in the photochemical aging of soot.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(30),7717-7722. |
MLA | Li, Meng,et al."Role of elemental carbon in the photochemical aging of soot".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.30(2018):7717-7722. |
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