期刊
CHEMICAL ENGINEERING JOURNAL
卷 434, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.134574
关键词
Layered double hydroxide; Graphene oxide; Heterogeneous Fenton-like reaction; Tetracycline; Dual-mechanism degradation
资金
- National Natural Science of China
- Natural Science of Shandong Province
- Fundamental Research Funds for the Central Universities
- International Clean Energy Talent Program by China Scholarship Council
- Development Fund of Shandong Key Laboratory of Oil & Gas Storage and Transportation Safety
- Conghua Qi from Shiyanjia Lab
A highly efficient and stable heterogeneous Fenton-like catalyst was successfully fabricated and exhibited excellent catalytic activity and reusability in the degradation of tetracycline through a dual-mechanism.
A highly efficient and stable heterogeneous Fenton-like catalyst was fabricated via growing CuxNiyCo-containing layered double hydroxide (LDH) nanosheets onto graphene oxide (GO) (CuxNiyCo-LDH/GO) by a facile co precipitation method. The Cu2.5Ni0.5Co-LDH/GO with higher crystallinity and a larger specific surface area exhibited the highest catalytic activity in the degradation of tetracycline (TC). The TC degradation and mineralization efficiencies achieved 96.5% and 80.4%, respectively, in 40 min under the optimum conditions (60 mg/L of catalyst, 10 mM of H2O2 and pH = 10.2). The catalyst also exhibited excellent reusability with the degradation of TC remaining above 95% after 5 successive cycles. A dual-mechanism of TC degradation was proposed: attacked by .OH primarily generated by catalyst surface and direct oxidation through the C-O-M bonds as the electron donor, leading to a high H2O2 utilization in the system. The degradation pathway of TC was also proposed based on the detected intermediates, and the overall toxicity of TC was effectively alleviated in Cu2.5Ni0.5Co-LDH/GO system according to toxicity prediction.
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