School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
Environ Sci Pollut Res Int. 2021 Jun;28(22):27520-27527. doi: 10.1007/s11356-020-11900-y. Epub 2021 Jan 29.
VUV/UV photodegradation technology, which is free of catalysts or oxidants, has been regarded as an efficient method to decompose gaseous VOCs. However, the mineralization of gaseous VOCs by VUV/UV photodegradation has seldom been discussed systematically. In this work, the mineralization of benzyl chloride in humid air is comprehensively investigated and the potential contributors in the system (i.e., light wavelength, O and HO) are discussed. As a result, more than 95.0% benzyl chloride is mineralized at 40 min in humid air with 80% relative humidity (RH) despite its initial concentrations (i.e., ranging from 4 to 20 ppm). It is found that both 185-nm VUV light and HO significant contribute to the efficient mineralization of benzyl chloride in humid air, while O only has a limited effect to the efficient mineralization of benzyl chloride in humid air. The introduction of HO into the VUV/UV photodegradation can reduce the emission of ozone obviously. These findings are significant inspiration to application of the VUV/UV photodegradation technology on the treatment of gaseous VOCs in the actual air atmosphere.
VUV/UV 光降解技术无需催化剂或氧化剂，被认为是一种有效分解气态 VOCs 的方法。然而，VUV/UV 光降解技术对气态 VOCs 的矿化作用很少被系统地讨论。在这项工作中，全面研究了湿空气中氯化苄的矿化作用，并讨论了系统中的潜在贡献者（即波长、O 和 HO）。结果表明，在相对湿度为 80%的湿空气中，即使初始浓度（即 4 至 20 ppm 之间），在 40 分钟内也能将超过 95.0%的氯化苄矿化。发现 185nm VUV 光和 HO 对湿空气中氯化苄的有效矿化作用有显著贡献，而 O 对湿空气中氯化苄的有效矿化作用只有有限的影响。将 HO 引入 VUV/UV 光降解中可以明显减少臭氧的排放。这些发现为 VUV/UV 光降解技术在实际大气环境中处理气态 VOCs 的应用提供了重要启示。
