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234 results on '"Lou, Lan-Lan"'

16. ZnFe2O4/BiVO4 Z-scheme heterojunction for efficient visible-light photocatalytic degradation of ciprofloxacin.

Author

Wang, Beibei, Qian, Kejiang, Yang, Weiping, An, Wenjing, Lou, Lan-Lan, Liu, Shuangxi, and Yu, Kai

Abstract

A novel Z-scheme ZnFe2O4/BiVO4 heterojunction photocatalyst was successfully synthesized using a convenient solvothermal method and applied in the visible light photocatalytic degradation of ciprofloxacin, which is a typical antibiotic contaminant in wastewater. The heterostructure of as-synthesized catalysts was confirmed using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy characterizations. Compared with the single-phase counterparts, ZnFe2O4/BiVO4 demonstrated considerably enhanced photogenerated charge separation efficiencies because of the Z-scheme transfer mechanism of electrons between the composite photocatalysts. Consequently, the 30% ZnFe2O4/BiVO4 catalyst afforded a degradation rate of up to 97% of 20 mg/L ciprofloxacin under 30 min of visible light irradiation with a total organic carbon removal rate of 50%, which is an excellent activity compared with ever reported BiVO4-based catalysts. In addition, the liquid chromatography-mass spectrometry and quantitative structure-activity relationships model analyses demonstrated that the toxicity of the intermediates was lower than that of the parent ciprofloxacin. Moreover, the as-synthesized ZnFe2O4/BiVO4 heterojunctions were quite stable and could be reused at least four times. This study thus provides a promising Z-scheme heterojunction photocatalyst for the efficient removal and detoxication of antibiotic pollutants from wastewater. [ABSTRACT FROM AUTHOR]

Published
2023
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35. Alkali Metal Cations as Charge‐Transfer Bridge for Polarization Promoted Solar‐to‐H2 Conversion.

Author

Wang, Meiyang, Zhang, Zhenzong, Chi, Zexu, Lou, Lan‐lan, Li, Hui, Yu, Han, Ma, Tianyi, Yu, Kai, and Wang, Hao

Subjects
ALKALI metals, POLARIZATION (Electricity), FERROELECTRIC materials, CHARGE transfer, ELECTRIC fields, IRRADIATION, PHOTOVOLTAIC effect
Abstract

Utilization of spontaneous polarization electric field of ferroelectric materials to realize the spatial separation and fast transfer of photogenerated charges has been regarded as a promising strategy to fabricate highly efficient photocatalysts. Herein, a novel heterostructure is constructed by coupling potassium poly(heptazine imide) (K‐PHI) with ferroelectric BaxSr1‐xTiO3 (BxST) through a facile electrostatic self‐assembly strategy. The ionic species of K‐PHI can neutralize the polarized charges in BxST to form intimate interfacial contact, substantially boosting the internal electric field. Notably, K+ cations intercalated into K‐PHI act as charge‐transfer bridge to promote migration and separation of photogenerated charge carriers. As a result, a significantly improved H2‐evolution rate of 1087.4 µmol h−1 g−1 with an apparent quantum yield (AQY) of 8.05% at 420 nm is achieved over 5% K‐PHI/B0.8ST, standing among the best polymeric carbon nitride‐based photocatalysts reported up to date. Moreover, the extreme stability of the catalysts is evidenced by remaining outstanding catalytic performance even after storage for half a year. This strategy can be extended to other alkali metal (Na+ and Cs+) modified polymeric materials, highlighting the key role of the bridging ions in constructing polarized heterostructure, which sheds light on the design of ferroelectric‐assisted photocatalysts. [ABSTRACT FROM AUTHOR]

Published
2023
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