The release of volatile organic compounds (VOCs) from stationary and mobile sources increases the concentration of these pollutants in the environment. These compounds have the potential to cause adverse effects on human health and the environment. The adoption of management and engineering procedures to control the emission of these pollutants to the air has become essential. The aim of this study was to use an advanced oxidation process namely the catalytic ozonation to reduce the concentration of these pollutants in industrial output. In this experimental study, the catalytic ozonation process in the presence of ZnO nanoparticles coated on zeolite media was used in a laboratory scale to treat the air contaminated with BTEX compounds as indicators of VOCs. For this purpose, First the nanocomposites were synthesized based on chemical co-precipitation method. SEM, XRD, BET and FT-IR analyses were performed to investigate the characteristics of nanocomposites. The variables including initial concentrations of BTEX (50–200 ppm), polluted air flow rate (5–20 l/h), humidity (0–75%) and ozone dose (0.25–1 g/h) were investigated. The concentration of BTEX compounds was measured by the Gas Chromatography (GC) technique according to the NIOSH 1501 manual. The results of SEM, XRD, BET and FT-IR analyses showed the proper synthesis of nanocomposites. According to the laboratory results, the optimal conditions of the process were found to be as follows: the initial concentration of pollutants equal to 50 ppm, inlet air flow rate of 5 l/h, relative air humidity of 25–35%, and inlet ozone concentration equal to 1 g/h. Under these conditions, the removal efficiency of the compounds: benzene, toluene, ethylbenzene and xylene were obtained 98, 96, 92 and 91%, respectively. Simple ozonation and adsorption processes were less efficient than catalytic ozonation. This process had the ability to reduce the concentration of BTEX compounds to standard level.

固定和移动源释放的挥发性有机化合物 (VOC) 会增加这些污染物在环境中的浓度。这些化合物有可能对人类健康和环境造成不利影响。采用管理和工程程序来控制这些污染物向空气中的排放已变得至关重要。本研究的目的是使用高级氧化工艺，即催化臭氧化来降低工业产出中这些污染物的浓度。在这项实验研究中，在实验室规模中使用涂覆在沸石介质上的 ZnO 纳米粒子存在的催化臭氧化过程来处理被 BTEX 化合物污染的空气，作为 VOC 的指标。以此目的，首先基于化学共沉淀法合成纳米复合材料。进行SEM、XRD、BET和FT-IR分析以研究纳米复合材料的特性。研究了包括 BTEX 初始浓度 (50–200 ppm)、污染空气流速 (5–20 l/h)、湿度 (0–75%) 和臭氧剂量 (0.25–1 g/h) 在内的变量。BTEX 化合物的浓度通过气相色谱 (GC) 技术根据 NIOSH 1501 手册进行测量。SEM、XRD、BET 和 FT-IR 分析的结果表明纳米复合材料的正确合成。根据实验室结果，该工艺的最佳条件为：污染物初始浓度等于 50 ppm，进风量为 5 l/h，相对空气湿度为 25-35%，进风臭氧浓度等于 1 g/h。在这些条件下，苯、甲苯、乙苯和二甲苯化合物的去除效率分别为98%、96%、92%和91%。简单的臭氧化和吸附过程不如催化臭氧化有效。该过程能够将 BTEX 化合物的浓度降低到标准水平。