中文摘要：

挥发性有机物（volatile organic compounds,VOCs）是主要的室内空气污染物,传统的处理方法存在运行费用高或二次污染的问题。为了寻找一种处理效率高、能量利用率高的方法,创新性地将介质阻挡放电处理技术与光催化技术相结合,以介质阻挡放电过程中产生的低温等离子体代替单纯紫外光为光催化材料的驱动力,有效地降低了能耗;协同处理过程中最终产物为无毒的CO2、H2O等无机小分子,副产物少且无害。实验过程中将经过改性的光催化剂氧化硅担载在电极表面,在人工搭建的密室内成功地利用介质阻挡放电协同介质光催化处理VOCs,协同处理效率明显大于单独介质阻挡放电技术或光化催技术的处理效率。基于介质阻挡放电处理技术与光催化技术的原理分析,进一步研究了电极直径、温度、湿度、催化剂位置及数量等参数对处理效果的影响特点与规律,处理效率与电极直径、湿度负相关,与催化剂数量正相关,环境温度对协同处理效率无明显影响,催化剂担载于正极比负极的协同处理效率低。通过将光催化与介质阻挡放电相结合,使2者相互协同、优势互补,为进一步研究开发出一种处理效率高、能耗低、副产物少且无害的室内VOCs降解方法提供参考与依据。

英文摘要：

Volatile organic compounds（VOCs） are the main indoor pollutants. The conventional methods to treat them are either of high cost or of secondary pollution risk. In order to develop an efficient and low consuming purification system against VOCs, dielectric barrier discharge （DBD） is innovatively introduced to cooperate with photo-catalytic treatment. Instead of using ultraviolet light solely to activate photo-catalytic materials, the low-pressure plasma generated from DBD plays an important role in the process and greatly reduces the energy consumption. Final products of the system are small inorganic molecules, such as CO2 and H20, and a small amount of non-toxic by-products. In the experiments, modified TiO2 as photo-catalyst was loaded on the electrode surface, and the VOCs were successfully treated by DBD and the pho- to-catalytic in the treatment room. The cooperating treatment had obviously higher efficiency than either DBD or photo-catalytic treatments. By theoretically analyzing the mechanism of DBD and photo-catalytic treatments, we investi- gated the relation of cooperated treatment efficiency with treatment settings, such as electrode diameter, temperature, humidity, catalyst location, and catalyst quantity. It is concluded that the treatment efficiency is negatively correlated with electrode diameter and humidity, positively correlated with catalyst amount, but barely correlated with temperature. Loading the catalyst on the positive electrode can lower the treatment efficiency compared to catalyst on the negative electrode. By combining DBD and photo-catalytic treatments together, the two means complement each other and blend into a method that paves the way for developing VOCs treatment of high efficiency, low power consumption, and limited innocuous by-products.