Hubei Key Lab of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China.
Chibi Research Institute for High-Quality Development, Chibi, 437300, China.
Environ Sci Pollut Res Int. 2022 Dec;29(59):88681-88689. doi: 10.1007/s11356-022-22008-w. Epub 2022 Jul 14.
Electrochemical methods have been widely applied in the treatment of phenol wastewater for the past few years. However, conventional electrochemical advanced oxidation processes (EAOPs) generally encounter the problem of electrode passivation and the energy consumption required for mineralization is high. In this work, we reported the treatment of phenol wastewater by electrochemical bromination method in a flow electrolysis cell. The Ti/Sb-SnO/PbO electrode was prepared and used as anode. The experiments were carried out under different initial pH, KBr concentrations, current densities, and volumetric flow rates. The generated 2,4,6-tribromophenol (TBP) could be easily separated from the electrode surface and electrolyte. The brominated intermediates were identified by GC/MS. The removal efficiencies for phenol and COD were 100% and 82.7%, respectively, under the best operational conditions (current density of 40 mA cm, KBr concentration of 0.074 mol L, initial pH of 1.0, and volumetric flow rate of 114 mL min). Furthermore, our electrochemical bromination method offered a high apparent current efficiency (ACE) of 276.6% and a low energy consumption (EC) of 4.54 × 10 kWh gCOD after 40 min of electrolysis time, indicating that this process was suitable for phenol wastewater treatment.
电化学方法在过去几年中已广泛应用于处理含酚废水。然而，传统的电化学高级氧化工艺（EAOPs）通常存在电极钝化的问题，并且矿化所需的能量消耗很高。在这项工作中，我们报告了在流动电解槽中通过电化学溴化法处理含酚废水。制备了 Ti/Sb-SnO/PbO 电极并用作阳极。在不同的初始 pH 值、KBr 浓度、电流密度和体积流速下进行了实验。生成的 2,4,6-三溴苯酚（TBP）可以很容易地从电极表面和电解质中分离出来。通过 GC/MS 鉴定了溴化中间体。在最佳操作条件（电流密度为 40 mA cm、KBr 浓度为 0.074 mol L、初始 pH 值为 1.0 和体积流速为 114 mL min）下，对苯酚和 COD 的去除效率分别达到 100%和 82.7%。此外，我们的电化学溴化法在 40 分钟的电解时间后提供了 276.6%的高表观电流效率（ACE）和 4.54×10 kWh gCOD 的低能耗（EC），表明该工艺适用于含酚废水处理。
