4.7 Article

Enhanced photocatalytic degradation of ciprofloxacin over Bi2O3/(BiO)(2)CO3 heterojunctions: Efficiency, kinetics, pathways, mechanisms and toxicity evaluation

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 334, Issue -, Pages 453-461

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.10.064

Keywords

Bi2O3/(BiO)(2)CO3; Ciprofloxacin; Kinetics model; Degradation mechanism; Toxicity

Funding

  1. National Natural Science Foundation of China [41503102]
  2. China Postdoctoral Science Foundation [2015M572568]
  3. Shaanxi Postdoctoral Science Foundation [2016BSHEDZZ35]
  4. National Key Research and Development Program of China [2016YFA0203000]
  5. Chinese Academy of Sciences

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In this study, the degradation of antibiotic ciprofloxacin (CIP) over Bi2O3/(BiO)(2)CO3 heterojunctions under simulated solar light irradiation (SSL-Bi2O3/(BiO)(2)CO3) was examined for the first time. The results showed that the Bi2O3/(BiO)(2)CO3 heterojunctions dramatically improved CIP decay efficiency. The effect of parameters showed that the CIP decay was optimized with the Bi2O3/(BiO)(2)CO3 dosage of 0.5 g/L and a wide pH range of 4.0-8.3, based on which, a kinetic model was derived to predict the remaining CIP concentration. It was found that the presence of anions like SO42-, NO3- and HCO3- decelerated the CIP decay, while the co-existence of Cl- accelerated the CIP decay. Six degradation intermediates were identified by ultra-performance liquid chromatography coupled with mass analyzer (UPLC/MS) and ion chromatographic (IC) analysis, and the decay pathways and degradation mechanism of CIP were proposed by combining the experiment data with theoretical calculation of frontier electron densities. Hydroxyl radical's reaction, photo-hole (h(+)) oxidation and reductive defluorination were found to involve in the CIP decay. The efficient alleviation on total organic carbon (TOC) and toxicity indicated that the complete mineralization and de-toxicity are possible by this system with sufficient reaction time.

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