Effective degradation of methylene blue by a novel electrochemically driven process

Effective degradation of methylene blue by a novel electrochemically driven process
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通过新型电化学驱动过程有效降解亚甲基蓝

DOI:
10.1016/j.elecom.2013.01.012
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发表时间:
2013-04
影响因子:
5.4
通讯作者:
Wang, Yujue
Wang, Yujue
中科院分区:
工程技术3区
文献类型:
--
作者:
Yuan, Shi;Li, Zhaoxin;Wang, Yujue

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开发了一种新的电化学驱动氧化法(E-过氧酮)处理亚甲基蓝(MB)废水。在E-peroxone过程中,臭氧发生器流出物(O2和O3气体混合物)连续喷射到具有碳-聚四氟乙烯(碳-PTFE)阴极的反应器中,该阴极可以有效地将喷射的O2电化学转化为H2 O2。原位生成的H2 O2然后与喷射的O3反应以产生羟基自由基(OH),其是比O3强得多的氧化剂。因此,通过利用臭氧氧化过程中没有什么价值的O2在原位产生H2 O2,E-过氧化物酮工艺可以实现O3和H2 O2(过氧化物酮)对污染物降解的协同作用。因此,E-过氧酮的过程中矿化MB更有效地比臭氧化。E-过氧酮和臭氧氧化处理2 h后,总有机碳的去除率分别为93%和22%。因此,E-过氧酮工艺可能提供一种简单而有效的方法来降解废水中的臭氧难降解有机污染物。
A new electrochemically driven process (E-peroxone) was developed to treat methylene blue (MB) wastewater. During the E-peroxone process, ozone generator effluent (O2and O3gas mixture) is continuously sparged into a reactor that has a carbon-polytetrafluorethylene (carbon-PTFE) cathode, which can electrochemically convert the sparged O2to H2O2effectively. The in situ generated H2O2then reacts with the sparged O3to produce hydroxyl radicals (OH), which are a much stronger oxidant than O3. Thus, by utilizing the sparged O2that has little value in ozonation processes to produce H2O2in situ, the E-peroxone process can achieve the synergy of O3and H2O2(peroxone) on pollutant degradation. The E-peroxone process therefore mineralized MB much more effectively than ozonation. The total organic carbon removal was 93 and 22% after 2h of the E-peroxone and ozonation treatment, respectively. The E-peroxone process may thus offer a simple and effective method to degrade ozone-refractory organic pollutants in wastewater.
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