Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 280, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2021.119751
Keywords
LaFeO3; Lignin-biochar; Ofloxacin; Visible light; Photo-Fenton-like degradation
Categories
Funding
- National Natural Science Foundation of China [22078057, 21576050]
- Fundamental Research Funds for the Central Universities of China [3207045403]
- Foundation of Jiangsu Key Laboratory for Biomass Energy and Material [JSBEM202001]
- Applied Basic Research Program of Suzhou [SYG202026]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX20_0014, SJCX20_0015]
- Jiangsu Province of China [6907041203]
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The LaFeO3/lignin-biochar composites exhibit enhanced adsorption and degradation ability for ofloxacin compared to LaFeO3 nanoparticles. The interaction between lignin-biochar and LaFeO3 nanoparticles reduces the bandgap of the latter, facilitating improved photo-Fenton-like activity. This composite is a promising catalyst for the efficient removal of ofloxacin through a combination of adsorption and photo-Fenton-like processes.
The perovskite-type LaFeO3 serves as a promising photo-Fenton-like catalyst, but its low adsorption ability and catalytic activity inhibit the effective removal of ofloxacin. Herein, the LaFeO3 and lignin-biochar composites were fabricated by a facile sol-gel pyrolysis route. As compared with LaFeO3 nanoparticles, the LaFeO3/lignin-biochar composites showed better adsorption and degradation ability due to the synergistic effect between LaFeO3 nanoparticles and lignin-biochar. Compared with LaFeO3, the adsorption capacity of LaFeO3/lignin-biochar for ofloxacin increased from 0.72 to 30.4 mg.g(-1). Importantly, this catalyst exhibited the improved degradation efficiency of ofloxacin during 75 min (95.6 % for LaFeO3/lignin-biochar Vs 53.4 % for LaFeO3) as the adsorption process was combined with the photo-Fenton-like process. Notably, the lignin-biochar in the LaFeO3/lignin-biochar composites decreased the bandgap of LaFeO3 nanoparticles from 2.10 eV to 1.79 eV due to the interface interaction between LaFeO3 and lignin-biochar, facilitating the enhanced photo-Fenton-like activity. The hydroxyl radicals that were generated in the photo-Fenton-like process effectively induced the oxidative degradation of ofloxacin, which was confirmed by free radical capture experiments and ESR characterization. Moreover, the photo-Fenton-like degradation pathway of ofloxacin was proposed according to LC-MS analyses, and the toxicity analysis of degradation intermediates was further carried out. Hence, the LaFeO3/lignin-biochar composite was a promising photo-Fenton-like catalyst to eliminate ofloxacin via coupling of adsorption and photo-Fenton-like processes.
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