期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 291, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2022.120904
关键词
Florfenicol; La doping; Ti4O7 electrode; Electrochemical degradation; Mechanism
资金
- Guangdong Province Key Research and Development Program [2020B090923002]
- Guang-dong Province Youth Innovative Talents Project in Higher Education [2018KQNCX257]
- Guangdong-Dongguan Joint Fund [2019B151530005]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110497]
- Research Start-up Funds of DGUT [GC300501-115]
In this study, a novel active La-doped Ti4O7 (La-Ti4O7) electrode was fabricated and its superior performance in the degradation of FLO-polluted water was demonstrated through characterization results.
In this study, a novel active La-doped Ti4O7 (La-Ti4O7) electrode was fabricated through a simple one-step spark plasma sintering method. Characterization results revealed that La was successfully incorporated into the crystal lattice of Ti4O7, leading to an increase in the surface oxygen vacancy content (from 26% to 31%), oxygen evolution potential (from 2.24 to 2.75 V vs SCE), hydroxyl radical yield [center dot OH, from 0.123 to 0.205 mu mol/(min.cm(2))] and interfacial charge-transfer rate compared to pristine Ti4O7. La-Ti4O7 electrodes achieved efficient anodic oxidation of florfenicol (FLO, one of the most widely used antibiotics), which mainly due to the indirect oxidation mediated by electro-generated center dot OH. The degradation of FLO by La-Ti4O7 electrodes fitted well with the pseudo-first-order kinetic model, and the optimal degradation rate constant (k(FLO), 0.021 min(-1)) was achieved by 1.60% La-Ti4O7 electrode. In addition, the degradation efficiency of FLO increased with the increasing current density, decreasing pH and co-existing Cl-, while an opposite pattern was observed with co-existing NO3-. Seven degradation products of FLO were identified by UPLC-MS/MS. The main degradation pathways included hydrolysis, hydroxylation, dechlorination and C-N bonds cleavage. The energy consumption (EC) for FLO degradation ranged from 1.91 to 29.53 Wh/L, and the optimal practical conditions were obtained by the analysis of the calculated ratios of k(FLO) and EC. Moreover, La-Ti4O7 electrode maintained excellent removal efficiency of FLO (>93.5%) within 20 degradation cycles. This study suggested that La-Ti4O7 is a promising anodic material for the efficient treatment of FLO-polluted water.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据