State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, China.
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, China; Alibaba-Zhejiang University Joint Research Institute of Frontier Technologies, China.
Chemosphere. 2021 Apr;269:129395. doi: 10.1016/j.chemosphere.2020.129395. Epub 2020 Dec 21.
The main purpose of this work was to quantify and characterize chemically and morphologically the emission of soot particles from the open burning of several common solid waste including paperboard, wood, peel, chemical fiber, polyethylene (PE) and polyvinyl chloride (PVC). The experiment was conducted in a laboratory-scale open-burning combustor with a dilution sampling system to obtain soot particles. The thermogravimetric profiles (TGA) showed an increasing order of oxidation reactivity: PE > PVC > fiber > paper ≈ peel > wood. High resolution transmission electron microscopy (HRTEM) images revealed more detailed information about the morphology and the particle size of soot aggregates. Subsequent quantification of nanostructure by fringe analysis showed that plastics generated soot particles with the looser carbon layers with higher tortuosity compared to the three kind of biomass. Raman spectroscopy further confirms the observed differences. In addition, wood soot exhibited the highest content of C-OH group (17.5%) among the six samples (X-Ray photoelectron spectroscopy, XPS), whereas PE and PVC soot exhibited the highest absorption peaks of aliphatic C-H groups (Fourier transform infrared spectroscopy, FTIR). Comparative analysis revealed that the interlayer distance was more important on the evaluation of reactivity than soot morphologies. The present work concluded that the physiochemical characteristics of soot particles releasing during open burning are strongly depending on waste composition and provided new data for the understanding of soot emissions from open burning.
这项工作的主要目的是定量和描述几种常见固体废物（包括纸板、木材、果皮、化纤、聚乙烯（PE）和聚氯乙烯（PVC））露天燃烧时的烟尘颗粒的化学和形态特征。实验在带有稀释采样系统的实验室规模露天燃烧燃烧器中进行，以获得烟尘颗粒。热重分析（TGA）曲线显示出氧化反应性的递增顺序：PE＞PVC＞纤维＞纸≈果皮＞木材。高分辨率透射电子显微镜（HRTEM）图像揭示了烟尘颗粒聚集体的形态和粒径的更详细信息。随后通过条纹分析对纳米结构进行定量，结果表明与三种生物质相比，塑料生成的烟尘颗粒具有更疏松的碳层和更高的曲折度。拉曼光谱进一步证实了观察到的差异。此外，在六个样品中（X 射线光电子能谱，XPS），木材烟尘的 C-OH 基团（17.5%）含量最高，而 PE 和 PVC 烟尘的脂肪族 C-H 基团的吸收峰最高（傅里叶变换红外光谱，FTIR）。比较分析表明，在评估反应性方面，层间距比烟尘形态更重要。本研究得出结论，露天燃烧过程中释放的烟尘颗粒的物理化学特性强烈取决于废物成分，并为理解露天燃烧排放的烟尘提供了新的数据。
