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首页> 外文期刊>Building and Environment >Photocatalytic degradation of VOCs on various commercial titanium dioxides: Impact of operating parameters on removal efficiency and by- products generation
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Photocatalytic degradation of VOCs on various commercial titanium dioxides: Impact of operating parameters on removal efficiency and by- products generation

机译：各种市售二氧化钛对VOC的光催化降解：操作参数对去除效率和副产物生成的影响

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摘要

Ultraviolet photocatalytic oxidation (UV-PCO) is regarded as one of the promising technologies for indoor air remediation. The present study examines the photocatalytic activity of four commercialized titanium dioxide photocatalysts (P25, PC500, UV100, and S5-300A) in a small-scale single-pass continuous flow reactor. Challenge compounds have been chosen from two prevalent VOC families in indoor environment: toluene (aromatics) and methyl ethyl ketone (ketones). The influence of key experimental conditions including concentration (100-1000 ppb), relative humidity (0-50% at 23 degrees C), light intensity (1.25-5 W m(-2)), and residence time (0.02-0.1 s) on removal efficiency are evaluated. Due to the fact that one of the main shortcomings of PCO air purifiers is by-products generation, a special emphasis is put on identification and quantification of gaseous by-products using HPLC and GC-MS methods. The obtained efficiencies on various photocatalysts are explained considering crystalinity, crystalline phase, crystal size, surface area, and population of surface hydroxyl groups. Despite possessing lower crystalinity, PC500, UV100 and S5-300A outperformed P25 in toluene and MEK removal efficiency, primarily owed to their larger surface area, smaller crystal size, and higher concentration of surface hydroxyl groups. Acetone, acetaldehyde, and formaldehyde were identified as the main gaseous byproducts in PCO of toluene and MEK.
机译：紫外线光催化氧化（UV-PCO）被认为是室内空气修复的有前途的技术之一。本研究在小型单程连续流反应器中研究了四种商业化的二氧化钛光催化剂（P25，PC500，UV100和S5-300A）的光催化活性。已从室内环境中的两个常见VOC系列中选择了挑战化合物：甲苯（芳族化合物）和甲基乙基酮（酮）。关键实验条件的影响包括浓度（100-1000 ppb），相对湿度（23摄氏度下为0-50％），光强度（1.25-5 W m（-2））和停留时间（0.02-0.1 s） ）去除效率的评估。由于PCO空气净化器的主要缺点之一是副产物的产生，因此特别强调了使用HPLC和GC-MS方法鉴定和定量气态副产物的方法。考虑到结晶度，晶相，晶体尺寸，表面积和表面羟基基团，解释了在各种光催化剂上获得的效率。尽管PC500，UV100和S5-300A具有较低的结晶度，但甲苯和MEK的去除效率却优于P25，这主要是由于它们具有较大的表面积，较小的晶体尺寸和较高的表面羟基浓度。丙酮，乙醛和甲醛被确定为甲苯和MEK的PCO中的主要气态副产物。

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