期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 289, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2022.120733
关键词
Red mud; Layered double hydroxide; Mixed metal oxide; Oxygen vacancies; Peroxydisulfate activation
资金
- Guangxi Science Foundation [2021GXNSFAA075006]
- National Natural Science Foundation of China [21667004]
- Open Project of Guangxi Key Laboratory of Bio-refinery [GXKLB20-01]
- Innovation Project of Guangxi Graduate Education [YCBZ2021028]
In this study, a low-cost and oxygen vacancies enriched mixed metal oxide derived from red mud-based layered double hydroxide was used as a peroxydisulfate activator to efficiently degrade ciprofloxacin under visible light irradiation. The optimal composite exhibited good performance, with approximately 87.4% degradation of ciprofloxacin achieved within 60 minutes. The oxygen vacancies in the composite were found to improve light absorption and promote electron-hole separation, resulting in the activation of peroxydisulfate and generation of active species for ciprofloxacin degradation.
In this work, a low-cost and oxygen vacancies (OVs) enriched mixed metal oxide (M-RM/MMO) derived from red mud-based layered double hydroxide (M-RM/LDH) was applied as an efficient peroxydisulfate (PDS) activator to realize the degradation of ciprofloxacin (CIP) under visible light (VL) irradiation. The optimal composite of M-RM/MMO-700 exhibited good performance, and approximately 87.4% of CIP (10 mg/L) could be degraded at 60 min via the photocatalysis activation of PDS (1.0 mM) over M-RM/MMO-700 (0.2 g/L). The result indicated the abundant OVs in M-RM/MMO-700 could improve light absorption and promote electron-hole separation, both of which were favorable for the activation of PDS, resulting in promoting the generation of active species in M-RM/MMO-700/PDS/VL system. Quenching experiments and EPR technology indicated that O-center dot(2)-, O-1(2) and h(+) were the main active species for the degradation of CIP. The M-RM/MMO catalyst possessed excellent reusability, stability and magnetic behavior in use. The degradation pathways of CIP were deduced based on DFT calculation and LC-MS analysis. Based on the quantitative structure-activity relationship (QSAR), the ecotoxicity of the degradation intermediates was analyzed in detail. This work provided a new insight for future designing of red mud-based LDHs-derived MMO heterogeneous catalyst with abundant OVs to efficiently treat antibiotics wastewater via the photocatalysis activation of PDS.
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