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TOF–SIMS surface analysis of chemical components of size–fractioned urban aerosols in a typical heavy air pollution event in Beijing

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Journal of Environmental Sciences 2018年第7期30卷 61-76页

作者： Wenjun Li Hong Li Jinjuan Li Xueli Cheng Zhengzheng Zhang Fahe Chai Hao Zhang Ting Yang Pengli Duan Defeng Lu Yizhen Chen College of Resource and Environmental Engineering Guizhou University Guiyang 550025 China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing 100012 China Collaborative Innovation Center on Atmospheric Environment and Equipment Technology Nanjing University of Information Science andTechnology Nanjing 210044 China SAE Technology Development (Dongguan) Co. Ltd. Guangdong 523087 China Environment Research Institute Shandong University Jinan 250100 China College of Earth Sciences Jilin University Changchun 130061 China Institute of Environment Science Shanxi University Shanxi 030001 China Core Tech Integrated (Beijing) Pty. Ltd. Beijing 100086 China

Size–fractioned atmospheric aerosol particles were collected during a typical heavy air pollution event in Beijing. The organic and inorganic components on the surfaces of the samples were analyzed using time–of–flight secondary ion mass spectrometry（TOF–SIMS）.The variation characteristics of the surface chemical composition and influencing factors were studied, and the possible sources of these chemical compositions were identified through principal component analysis. The results showed that inorganic components such as crustal elements and sulfate, and organic components such as aliphatic hydrocarbons and oxygen–containing organic groups were present. Some surface components, such as polycyclic aromatic hydrocarbons, heavy metals and fluorides may exert adverse effects on human health. The species and relative percentages of the chemical components varied with particle size, diurnal and pollution progress. During a heavy pollution event, the species and relative percentages of secondary components such as oxygen–containing organic groups and sulfurous compounds increased, indicating that particles aged during this event. The surface chemical composition of the aerosol particles was affected mainly by emissions from coal combustion and motor vehicles. In addition, air pollution, meteorological factors, and air mass transport also exerted a significant effect on the surface chemical composition of aerosol particles.

关键词： Atmospheric aerosol particles Air pollution event surface chemical composition Influence factor Static Time-of-flight secondary ion mass spectrometry Beijing

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发光二极管用于活性炭负载光催化剂反应器中挥发性有机化合物的降解(英文)

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催化学报 2011年第5期32卷 756-761页

作者： Sung-Bong YANG Mee-Seon YU Jong-Soon KIM Wan-Kuen JO Department of Chemistry College of Natural ScienceUniversity of Ulsan NGETech Inc Department of Environmental Engineering Kyungpook National University

The applicability of ultraviolet-light emitting diodes(LEDs)as a light source for photocatalysis using granular activated charcoal (GAC)impregnated with transition metal-enhanced photocatalysts for the control of volatile organic compounds(VOCs)was investigated. Two target compounds(toluene and methyl mercaptan)were selected to evaluate the removal activities of the TiO2/GAC *** photocatalysts were prepared by a sol-gel *** trimethoxy silane was added as a precursor sol solution to bind the photocatalyst with the ***(Zn 2+ ,Fe 3+ ,Ag + ,and Cu 2+ )enhanced TiO2/GAC composites were prepared and tested for their photocatalytic activities under 400 nm LED *** specific surface area(SSA)and the surface chemical composition of the prepared composites were *** SSAs of all the impregnated composites were similar to those of pure *** field emission-scanning electron microscopy and energy dispersive spectroscopic analysis confirmed that titanium and the impregnated metals were deposited on the surface of the *** breakthrough time for GAC toward toluene or methyl mercaptan gas increased upon photocatalytic impregnation and LED *** different binders affected the breakthrough time of the TiO2/GAC composite and the addition of zinc oxide to TiO2 increased the VOC removal capacity of the GAC composite.

关键词： granular activated charcoal titania sol-gel method light emitting diode surface chemical composition zinc oxide

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