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首页> 外文期刊>Science and Technology for the Built Environment >Performance of various commercial TiO2 in photocatalytic degradation of a mixture of indoor air pollutants: Effect of photocatalyst and operating parameters
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Performance of various commercial TiO2 in photocatalytic degradation of a mixture of indoor air pollutants: Effect of photocatalyst and operating parameters

机译：室内空气污染物混合物的光催化降解各种商业TiO2的性能：光催化剂和操作参数的影响

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Photocatalytic oxidation (PCO) air cleaners can be installed in air handling units to reduce occupants' exposure to hazardous gases, boost indoor air quality, and concomitantly lower HVAC energy consumption by lowering the required ventilation rate. In this work, photocatalytic activity of four commercialized titanium dioxide photocatalysts (P25, PC500, UV100, and S5-300A) for treating a mixture of seven prevalent volatile organic compounds (VOCs) were assessed in a continuous flow reactor. The impacts of major experimental factors, namely concentration (15-100ppb), relative humidity level (0-60% at 23 degrees C), and residence time (0.012-0.05s), on the removal efficiency and by-products generation were examined. Photocatalysts were characterized by X-ray diffraction (XRD), nitrogen adsorption-desorption, Fourier transform infrared (FTIR), and scanning electron microscopy (SEM). UV100 possessed the highest values for total VOC removal efficiency, which could be attributed to its large surface area, high porosity, good crystallinity, and large population of surface hydroxyls. Regarding relative humidity, two dominant trends were found: i) increasing the humidity resulted in lower removal efficiencies or ii) existence of an optimum humidity level in some cases. The treatment efficiency followed the order: alcohols>ketones>aromatics>alkanes. The main by-products in the gas phase were formaldehyde, acetaldehyde, acetone, and propionaldehyde.
机译：光催化氧化（PCO）空气清洁剂可以安装在空气处理单元中，以减少占用者的危险气体，促进室内空气质量，并通过降低所需的通风率来伴随HVAC能耗。在这项工作中，在连续流动反应器中评估用于治疗七种普遍的挥发性有机化合物（VOC）的混合物的四种商业化二氧化钛光催化剂（P25，PC500，UV100和S5-300A）的光催化活性。重大实验因素，即浓度（15-100ppb），相对湿度水平（在23℃下0-60％）的影响，以及停留时间（0.012-0.05s），对去除效率和副产物产生进行。光催化剂的特征在于X射线衍射（XRD），氮吸附 - 解吸，傅里叶变换红外（FTIR），以及扫描电子显微镜（SEM）。 UV100具有总VOC去除效率的最高值，可归因于其大表面积，高孔隙率，良好的结晶度和大量表面羟基群体。关于相对湿度，发现了两种显性趋势：i）在某些情况下，增加湿度导致较低的去除效率或II）存在最佳湿度水平。治疗效率遵循订单：醇>酮>芳烃>烷烃。气相中的主要副产物是甲醛，乙醛，丙酮和丙醛。

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