ABSTRACT Carbonaceous constituents in fine particulate matter (PM2.5) are often associated with adverse health effects in humans. Although air filtration technology is widely used for preventing exposure to PM2.5, the trapped PM2.5 still has hazardous property if not treated subsequently. Thus, this study aimed to realise detoxification of PM2.5 with a photocatalytic decomposition of carbonaceous compounds in PM2.5 samples collected on a quartz fibre filter coated with titanium dioxide (TiO2). The mass of PM2.5 gradually decreased with time during the UV irradiation with a significant release of carbon dioxide (CO2) as a product. The analysis of organic carbon (OC) and elemental carbon (EC) using a thermal/optical carbon analyser following the IMPROVE protocol showed that carbonaceous constituents such as OC1, OC2, OC3, OC4, and EC1 fractions were successfully decomposed by UV-irradiated TiO2, whereas EC2 and EC4 fractions were inert to the photocatalysis. However, a majority of the carbon content, approximately 92% of the total carbon, was reduced by the proposed method. This shows that the photon-induced TiO2 potentially reduces the hazardous effects of PM2.5. GRAPHICAL ABSTRACT

中文翻译：

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TiO2支撑石英纤维过滤器上收集的大气细颗粒物（PM2.5）的光催化降解

摘要 细颗粒物 (PM2.5) 中的含碳成分通常与人类的不良健康影响有关。虽然空气过滤技术被广泛用于防止暴露于 PM2.5，但被捕获的 PM2.5 如果不进行后续处理，仍然具有危险性。因此，本研究旨在通过光催化分解在涂有二氧化钛 (TiO2) 的石英纤维过滤器上收集的 PM2.5 样品中的含碳化合物来实现 PM2.5 的解毒。PM2.5 的质量在紫外线照射期间随着时间的推移逐渐减少，同时大量释放二氧化碳 (CO2) 作为产物。使用热/光碳分析仪按照 IMPROVE 协议对有机碳 (OC) 和元素碳 (EC) 进行分析表明，碳质成分如 OC1、OC2、OC3、OC4、和 EC1 馏分被紫外线照射的 TiO2 成功分解，而 EC2 和 EC4 馏分对光催化是惰性的。然而，大部分碳含量，约占总碳的 92%，被建议的方法减少了。这表明光子诱导的 TiO2 可能会降低 PM2.5 的有害影响。图形概要