Catalyst deactivation and secondary pollution are the critical issues challenging the traditional heterogeneous catalysis (gas-solid) methods for VOCs removal at room temperature. This process strongly depends on the available OH radicals. Because of the facile formation of OH radicals, H₂O₂-based advanced oxidation processes (AOPs) may facilitate VOCs removal. In this paper, UV/H₂O₂, for the first time, was employed to degrade continuous-flow gaseous toluene in batch system with comparison to UV/Fenton and Fenton process. UV/H₂O₂ process was identified to moderately generate OH radicals and yielded removal efficiency higher than 80% without any loss while it gradually declined to 32% and 45% within 120min in the Fenton and UV/Fenton process, respectively. No emission of gaseous intermediates was identified at the outlet in all the AOPs. Most of the removed toluene was oxidized into CO₂ in the UV/H₂O₂ process, however, many organic intermediates were generated in the solution of Fenton and UV/Fenton process. The superior performance of UV/H₂O₂ process was mainly ascribed to the continuous formation of OH. This study demonstrates that UV/H₂O₂ process can be applied as an efficient and environment-benign technology for VOCs treatment.

中文翻译：

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UV / H2O2：一种有效的水性高级氧化工艺，用于去除VOC

催化剂失活和二次污染是挑战在室温下去除VOC的传统多相催化（气固）方法的关键问题。该过程强烈取决于可用的 OH基。由于容易形成 OH自由基，因此基于H ₂ O ₂的高级氧化过程（AOP）可以促进VOC的去除。与UV / Fenton和Fenton工艺相比，本文首次采用UV / H ₂ O ₂间歇式降解连续流气态甲苯。经确认，UV / H ₂ O ₂过程适度产生 在Fenton和UV / Fenton工艺中，OH自由基的去除效率均高于80％，且无任何损失，而在120分钟内逐渐下降至32％和45％。在所有AOP的出口处均未发现气态中间体的排放。在UV / H ₂ O ₂工艺中，大部分去除的甲苯被氧化为CO ₂，但是，在Fenton和UV / Fenton工艺的溶液中产生了许多有机中间体。UV / H ₂ O ₂工艺的优异性能主要归因于连续形成OH。这项研究表明UV / H ₂ O ₂ 该工艺可以作为一种有效且对环境有益的技术用于VOC的处理。