Hebei University of Technology, School of Chemical Engineering and Technology, Tianjin 300130, PR China.
Hebei University of Technology, School of Chemical Engineering and Technology, Tianjin 300130, PR China.
Chemosphere. 2019 Feb;216:812-822. doi: 10.1016/j.chemosphere.2018.10.191. Epub 2018 Oct 30.
Electrochemical degradation of hexazinone in aqueous solution using Bi-doped PbO electrodes as anodes was investigated. The main influencing parameters on the electrocatalytic degradation of hexazinone were analyzed as function of initial hexazinone concentration, current density, initial pH value and NaSO concentration. The experiment results showed that the electrochemical oxidization reaction of hexazinone fitted pseudo-first-order kinetics model. 99.9% of hexazinone can be decontaminated using Bi-doped PbO electrode as anode for 120 min. Comparing with pure PbO electrode, the Bi-doped PbO electrodes possess higher hexazinone and COD removal ratio, higher ICE and lower energy consumption in the electrocatalytic degradation process. The results revealed that electrochemical oxidation using Bi-doped PbO anodes was an efficient method for the elimination of hexazinone in aqueous solution. The electrocatalytic oxidization mechanism of hexazinone with Bi-doped PbO anode was discussed, then the possible degradation pathway of hexazinone with two parallel sub-routes was elucidated according to 15 intermediates identified using HPLC-MS.
采用 Bi 掺杂 PbO 电极作为阳极，研究了水溶液中六嗪酮的电化学降解。分析了初始六嗪酮浓度、电流密度、初始 pH 值和 NaSO 浓度等主要影响参数对六嗪酮电催化降解的影响。实验结果表明，六嗪酮的电化学氧化反应符合准一级动力学模型。采用 Bi 掺杂 PbO 电极作为阳极，在 120 min 内可将 99.9%的六嗪酮脱除。与纯 PbO 电极相比，Bi 掺杂 PbO 电极在电催化降解过程中具有更高的六嗪酮和 COD 去除率、更高的 ICE 和更低的能耗。结果表明，采用 Bi 掺杂 PbO 阳极电化学氧化是去除水溶液中六嗪酮的有效方法。讨论了 Bi 掺杂 PbO 阳极对六嗪酮的电催化氧化机理，然后根据 HPLC-MS 鉴定的 15 种中间产物，阐明了六嗪酮的可能降解途径，有两条平行的子途径。
