Mehralipour Jamal, Jafari Ahmad Jonidi, Gholami Mitra, Esrafili Ali, Kermani Majid
Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran.
Air Pollution Research Center, Iran University of Medical Sciences, Tehran, Iran.
J Environ Health Sci Eng. 2022 Oct 29;20(2):937-952. doi: 10.1007/s40201-022-00837-8. eCollection 2022 Dec.
One of the popular process in volatile organic compounds removal in gas phase is advanced oxidation process. We in this research, synthesized BiOI@NH-MIL125(Ti)/Zeolite nanocomposite as a novel nanocomposite to degradation of benzene in hybrid advanced oxidation process. The nanocomposite synthesized via solvothermal method. The effect of airflow, ozone gas concentration, hydrogen peroxide concentration, relative humidity and initial benzene concentration are the main parameters in the UV/O/HO/ nanocomposite hybrid process that were studied. The characterization by XRD, FT-IR, FESEM, EDS element mapping, TEM, BET, and UV-vis spectra indicated that nanocomposite were well synthesized. Optimal operating conditions of the process were determined at air flow of 0.1 l/min, ozone concentration of 0.3 mg/min, hydrogen peroxide concentration of 150 ppm, relative humidity of 45 ± 3% and benzene concentration of 50 ppmv. Under these conditions, more than 99% of benzene was degraded. The synergistic effect coefficient of the mechanisms is 1.53. The nanocomposite had good stability in the hybrid process and remained above 99% efficiency up to 5 times. The ozone concentration residual the system was reported to be negligible (0.013 mg/min). The CO and CO emissions in the hybrid process was higher than other processes, which indicates better mineralization in the hybrid process. Formaldehyde, octane, noonan, phenol, decanoic acid were reported as the main by-products. The results indicated that UV/O/HO/ nanocomposite hybrid process has fantastic efficiency in the degradation of benzene as one of the indicators of VOCs.
气相挥发性有机化合物去除中一种流行的方法是高级氧化过程。在本研究中，我们合成了BiOI@NH-MIL125(Ti)/沸石纳米复合材料，作为一种新型纳米复合材料用于混合高级氧化过程中苯的降解。该纳米复合材料通过溶剂热法合成。气流、臭氧气体浓度、过氧化氢浓度、相对湿度和初始苯浓度的影响是UV/O₃/H₂O₂/纳米复合材料混合过程中研究的主要参数。通过XRD、FT-IR、FESEM、EDS元素映射、TEM、BET和UV-vis光谱表征表明纳米复合材料合成良好。该过程的最佳操作条件确定为气流0.1 l/min、臭氧浓度0.3 mg/min、过氧化氢浓度150 ppm、相对湿度45±3%和苯浓度50 ppmv。在这些条件下，超过99%的苯被降解。该机制的协同效应系数为1.53。纳米复合材料在混合过程中具有良好的稳定性，高达5次时效率仍保持在99%以上。据报道，系统中残留的臭氧浓度可忽略不计(0.013 mg/min)。混合过程中的CO和CO₂排放高于其他过程，这表明混合过程中有更好的矿化作用。甲醛、辛烷、壬烷、苯酚、癸酸被报道为主要副产物。结果表明，UV/O₃/H₂O₂/纳米复合材料混合过程在作为挥发性有机化合物指标之一的苯的降解方面具有出色的效率。
