Details

Autor(en) / Beteiligte

• Li, Qingyong
• Wei, Guangtao
• Duan, Guangxiang
• Zhang, Linye
• Li, Zhongmin
• Wei, Zhixian
• Zhou, Qian
• Pei, Ruinan

Titel

Photocatalysis activation of peroxydisulfate over oxygen vacancies-rich mixed metal oxide derived from red mud-based layered double hydroxide for ciprofloxacin degradation

Ist Teil von

• Separation and purification technology, 2022-05, Vol.289, p.120733, Article 120733

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• [Display omitted] •OVs-rich M−RM/MMO derived from red mud-based LDH was used as PDS activator.•The vital role of OVs in the M−RM/MMO-700/PDS/VL system was explored.•M−RM/MMO possessed excellent reusability, stability and magnetic behavior in use.•Degradation pathway of CIP was deduced by LC-MS analysis and DFT calculation.•Ecotoxicity of degradation intermediates was analyzed by QSAR method. 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 O2−, 1O2 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.