College of Resources and Environment, Southwest University, Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400715, PR China; Faculty of Chemical and Pharmaceutical Engineering, Chongqing Industry Polytechnic College, Chongqing, 401120, PR China.
College of Resources and Environment, Southwest University, Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400715, PR China.
Chemosphere. 2020 Nov;259:127488. doi: 10.1016/j.chemosphere.2020.127488. Epub 2020 Jun 30.
A Ce-doped Ti/PbO electrode was prepared in a deposition solution containing Ce and Pb ions by electrodeposition, and the surface morphology, crystal structure and elemental states were characterized by SEM, XRD and XPS. The electrode was used to investigate the simultaneous degradation of three phthalate esters (PAEs), i.e., dimethyl phthalate (DMP), diethyl phthalate (DEP) and dibutyl phthalate (DBP) in synthetic wastewaters. The results showed that the electrode exhibited excellent electrocatalytic activity and good reusability and stability, and the removal efficiencies of 5 mg L DBP, DMP and DEP in 0.05 M NaSO (pH 7) reached 98.2%, 95.8% and 81.1% at current density of 25 mA cm after 10 h degradation, respectively. The degradation processes followed pseudo first-order kinetic model very well, and the observed rate constants of DBP, DEP and DMP were 0.42, 0.40 and 0.29 h, respectively. The energy consumption in three PAEs degradation was also assessed. The main degradation products of the three PAEs were identified by using liquid chromatography-tandem mass spectrometry, and the possible degradation pathways mainly included dealkylation, hydroxyl addition, decarboxylation and benzene ring cleavage. This work is a promising candidate for efficient treatment of multiple PAEs in wastewater and protection of the aquatic ecological environment.
采用电沉积法在含有 Ce 和 Pb 离子的沉积溶液中制备了 Ce 掺杂的 Ti/PbO 电极，通过 SEM、XRD 和 XPS 对其表面形貌、晶体结构和元素状态进行了表征。该电极用于研究在合成废水中同时降解三种邻苯二甲酸酯（PAEs），即邻苯二甲酸二甲酯（DMP）、邻苯二甲酸二乙酯（DEP）和邻苯二甲酸二丁酯（DBP）。结果表明，该电极表现出优异的电催化活性和良好的可重复使用性和稳定性，在电流密度为 25 mA cm 时，在 0.05 M NaSO（pH 7）中，5 mg L 的 DBP、DMP 和 DEP 的去除效率在 10 h 降解后分别达到 98.2%、95.8%和 81.1%。降解过程很好地遵循了准一级动力学模型，DBP、DEP 和 DMP 的观察到的速率常数分别为 0.42、0.40 和 0.29 h。还评估了三种 PAEs 降解的能耗。通过液相色谱-串联质谱联用技术鉴定了三种 PAEs 的主要降解产物，可能的降解途径主要包括脱烷基化、羟基加成、脱羧基和苯环断裂。这项工作为高效处理废水中的多种 PAEs 和保护水生态环境提供了一种很有前途的候选方法。
