巴豆生物柴油和化石柴油共热解产生的自由基和超细颗粒物排放。

Q1 Chemistry Chemistry Central Journal Pub Date : 2018-08-07 DOI:10.1186/s13065-018-0458-6
Joshua K Kibet, Bornes C Mosonik, Vincent O Nyamori, Silas M Ngari
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引用次数: 9

摘要

背景:大气已成为燃烧事件中自由基和颗粒物的主要传输通道。这项研究的动机是确定柴油混合物热降解过程中形成的颗粒物排放和表面结合自由基的性质,以评估二元运输燃料对健康和环境的危害。方法:因此,这一贡献探索了在石英反应器中,在600°C的惰性氮气流下,以0.5 s的停留时间,以1:1的重量比共同热解大菱角生物柴油和化石柴油时发生的相互作用。使用Feld发射枪扫描电子显微镜(FEG-SEM)对所形成的热炭的表面形态进行成像,同时使用电子顺磁共振波谱仪(EPR)来探索热炭表面上自由基的存在。利用傅立叶变换红外光谱(FTIR)研究了热炭表面吸附的分子官能团。结果:红外光谱表明,炭表面的主要官能团基本上是芳基和一些亚甲基。在这项工作中检测到的颗粒物排放是超细的(~ 32nm)。颗粒物与本研究中观察到的SEM图像一致。电子顺磁共振结果给出了2.0027的g值,这是芳香性质的碳基自由基的特征。获得的光谱峰-峰宽度(∆Hp-p)较窄(4.42 G)。结论:被鉴定为碳基的自由基在医学上臭名昭著,可能通过各种大小的颗粒物转移到人肺表面,从而引发癌症和肺部疾病。这项工作中确定的纳米颗粒可能会在人类和其他自然生态系统中引发严重的生物健康问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Free radicals and ultrafine particulate emissions from the co-pyrolysis of Croton megalocarpus biodiesel and fossil diesel.

Background: The atmosphere has become a major transport corridor for free radicals and particulate matter from combustion events. The motivation behind this study was to determine the nature of particulate emissions and surface bound radicals formed during the thermal degradation of diesel blends in order to assess the health and environmental hazards of binary transport fuels.

Methodology: Accordingly, this contribution explored the interactions that occur when Croton megalocarpus biodiesel and fossil diesel in the ratio of 1:1 by weight were co-pyrolyzed in a quartz reactor at a residence time of 0.5 s under an inert flow of nitrogen at 600 °C. The surface morphology of the thermal char formed were imaged using a Feld emission gun scanning electron microscope (FEG SEM) while Electron paramagnetic resonance spectrometer (EPR) was used to explore the presence of free radicals on the surface of thermal char. Molecular functional groups adsorbed on the surface of thermal char were explored using Fourier transform infrared spectroscopy (FTIR).

Results: FTIR spectrum showed that the major functional groups on the surface of the char were basically aromatic and some methylene groups. The particulate emissions detected in this work were ultrafine (~ 32 nm). The particulates are consistent with the SEM images observed in this study. Electron paramagnetic resonance results gave a g-value of 2.0027 characteristic of carbon-based radicals of aromatic nature. Spectral peak-to-peak width (∆Hp-p) obtained was narrow (4.42 G).

Conclusions: The free radicals identified as carbon-based are medically notorious and may be transported by various sizes of particulate matter on to the surface of the human lung which may trigger cancer and pulmonary diseases. The nanoparticulates determined in this work can precipitate severe biological health problems among humans and other natural ecosystems.

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来源期刊
Chemistry Central Journal
Chemistry Central Journal 化学-化学综合
CiteScore
4.40
自引率
0.00%
发文量
0
审稿时长
3.5 months
期刊介绍: BMC Chemistry is an open access, peer reviewed journal that considers all articles in the broad field of chemistry, including research on fundamental concepts, new developments and the application of chemical sciences to broad range of research fields, industry, and other disciplines. It provides an inclusive platform for the dissemination and discussion of chemistry to aid the advancement of all areas of research. Sections: -Analytical Chemistry -Organic Chemistry -Environmental and Energy Chemistry -Agricultural and Food Chemistry -Inorganic Chemistry -Medicinal Chemistry -Physical Chemistry -Materials and Macromolecular Chemistry -Green and Sustainable Chemistry
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