School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, China; School of Ecology and Environment, Zhengzhou University, Zhengzhou, 450001, China.
School of Ecology and Environment, Zhengzhou University, Zhengzhou, 450001, China.
Chemosphere. 2021 Jul;275:129998. doi: 10.1016/j.chemosphere.2021.129998. Epub 2021 Feb 18.
The UV lights of different wavelengths were performed in boosting hydroxyl radicals (OH) generation from traditional Fenton reagent for the gaseous toluene removal. The Fenton, UV/Fenton and UV/Fenton processes were first adopted to eliminate gaseous toluene through the bubble column reactor, respectively. The stable toluene removal efficiency in 60 min was 85.31% in the UV/Fenton process, which was higher than other processes. The gaseous toluene was mainly oxidized into CO rather than other gaseous intermediates in the UV/Fenton process. For UV/Fenton process, the GC-MS tests were carried out to figure out the aqueous intermediates of gaseous toluene removal. The OH concentration in the UV/Fenton process was the highest among all the parallel tests via the EPR experiments and the quantificational measurements with coumarin as the probe. The iron ion in the aqueous solution was systematically evaluated with the experiments proceeding. The evolution of iron ion in the aqueous solution indicated that the fast reduction of Fe to Fe was assisted with 365 nm UV rather than 254 nm UV, which played a key point in the high gaseous toluene removal efficiency. This study demonstrated that the combination of UV irradiation and Fenton in the wet scrubbing reactor performed a synergistic effect on the gaseous toluene removal.
不同波长的紫外线照射可增强传统芬顿试剂中产生活性羟基自由基（OH）的生成，从而去除气相甲苯。首先采用鼓泡柱反应器分别进行芬顿法、UV/Fenton 法和 UV/Fenton 法去除气相甲苯。在 UV/Fenton 法中，60 min 内甲苯的去除效率稳定在 85.31%，高于其他工艺。在 UV/Fenton 法中，气相甲苯主要被氧化为 CO，而不是其他气态中间产物。对于 UV/Fenton 法，通过气相色谱-质谱（GC-MS）测试来确定气相甲苯去除过程中的水相中间产物。通过电子顺磁共振（EPR）实验和以香豆素为探针的定量测量，确定了在所有平行实验中，UV/Fenton 法中的 OH 浓度最高。系统地评估了水溶液中的铁离子随实验进行的变化。水溶液中铁离子的演变表明，Fe 的快速还原为 Fe 受到 365nm 紫外线的辅助，而不是 254nm 紫外线，这是实现高气相甲苯去除效率的关键。本研究表明，在湿式洗涤器反应器中，紫外线照射与芬顿试剂相结合对气相甲苯的去除具有协同作用。
