Synergistic adsorption-photocatalytic degradation effect and norfloxacin mechanism of ZnO/ZnS@BC under UV-light irradiation.

Scientific Reports
Wen LiuYunlin Zhao

Abstract

Norfloxacin (NOF) is an environmentally harmful and ubiquitous aquatic pollutant with extensive production and application. In this study, a novel composition named carbon-based composite photocatalytic material of zinc oxide and zinc sulphide (ZnO/ZnS@BC) was successfully obtained by the impregnation-roasting method to remove NOF under UV-light. Scanning electron microscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and energy dispersive spectrometer characterised the composition. ZnO/ZnS was successfully decorated on the surface of biochar (BC). The pH, the ZnSO4/PS ratio, and ions and quenchers, were investigated. High removal efficiency was obtained with a pH of 7 and a ZnSO4/PS ratio of 1:1, and the removal ratio of NOF reached 95% within three hours; the adsorption and degradation ratios reached 46% and 49%, respectively. Fe2+ promoted the degradation of NOF, whereas other ions inhibited it, with NO3- showing the strongest inhibitory effect. Three reactive species (tert-butanol, quinone, and ammonium oxala) were identified in the catalytic system. The decreasing order of the contribution of each reactive species was: O2- > ·OH- > h+. Additionally, a recycling experiment demonstrated the stability ...Continue Reading

References

Feb 22, 2005·Environmental Toxicology and Chemistry·April A RobinsonMichael J Lydy
Jan 16, 2007·Journal of Hazardous Materials·M M Haque, M Muneer
Feb 3, 2009·Chemosphere·Klaus Kümmerer
Feb 24, 2015·Journal of Environmental Management·Lucilaine Valéria de Souza SantosLiséte Celina Lange
Oct 18, 2018·Chemical Society Reviews·Zheng WangKazunari Domen

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