期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 259, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2020.118156
关键词
gamma-Fe2O3/CeO2; Tetracycline; Surface water; Activation mechanism; Degradation pathway
资金
- Key Research and Development Project of Shandong Province [2018CXGC1007]
The study successfully prepared γ-Fe2O3/CeO2 for efficient degradation of tetracycline, exhibiting good stability and reusability, and achieved high removal efficiency through persulfate activation.
Tetracycline is a typical antibiotic that is eco-toxic and easily causes bacterial resistance, and thus it is necessary to eliminate tetracycline from the water environment. In this work, gamma-Fe2O3/CeO2 was prepared and used to activate persulfate for tetracycline degradation. The catalyst was characterized by XRD, VSM and XPS, and results showed that it had excellent crystallinity and magnetism. The low valence metals (Fe (II) and Ce (III)) in gamma-Fe2O3/CeO2 benefited persulfate activation. Tetracycline removal efficiency reached 84% with the gamma-Fe2O3/CeO2/persulfate system; and the value was 70% in the surface water matrix. In addition, gamma-Fe2O3/CeO2 kept high activity from pH 3 to 9. It had high stability and reusability and was easily recycled from solution due to its good magnetism. Mechanism analyses showed that SO4 center dot- and center dot OH on catalyst surface catalyst were the major active species, O-2(center dot)- and O-1(2) were also produced due to the excess oxygen vacancies of catalyst. Moreover, the degradation products of tetracycline were determined, and the degradation pathway was proposed. Hydroxylation, demethylation, decarbonylation, dehydroxylation, C-N bond cleavage and ring-opening were the main pathway. The cost of wastewater treatment with the gamma-Fe2O3/CeO2/persulfate system was estimated to be 0.106 $/m(3). This study provided an efficient and stable catalyst for tetracycline degradation.
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