期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 21, 期 19, 页码 11116-11125出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-014-2515-6
关键词
Photo-Fenton; Continuous flow; Antibiotics; Ciprofloxacin; Magnetic nanoparticles
资金
- LSRE/LCM LA [PEst-C/EQB/LA0020/2013]
- FEDER through COMPETE - Programa Operacional Factores de Competitividade
- FCT - Fundacao para a Ciencia e a Tecnologia
- FCT Investigator Programme [IF/01501/2013]
- European Social Fund
- Human Potential Operational Programme
- FCT [SFRH/BPD/48777/2008]
- [PTDC/EQU-ERQ/123045/2010]
- [PTDC/EBB-EBI/103761/2008]
- Fundação para a Ciência e a Tecnologia [PTDC/EBB-EBI/103761/2008] Funding Source: FCT
The degradation of ciprofloxacin was studied in aqueous solutions by using a continuous flow homogeneous photo-Fenton process under simulated solar light. The effect of different operating conditions on the degradation of ciprofloxacin was investigated by changing the hydrogen peroxide (0-2.50 mM) and iron(II) sulphate (0-10 mg Fe L-1) concentrations, as well as the pH (2.8-10), irradiance (0-750 W m(-2)) and residence time (0.13-3.4 min) of the process. As expected, the highest catalytic activity in steady state conditions was achieved at acidic pH (2.8), namely 85 % of ciprofloxacin conversion, when maintaining the other variables constant (i.e. 2.0 mg L-1 of iron(II), 2.50 mM of hydrogen peroxide, 1.8 min of residence time and 500 W m(-2) of irradiance). Additionally, magnetite magnetic nanoparticles (ca. 20 nm of average particle size) were synthesized, characterized and tested as a possible catalyst for this reaction. In this case, the highest catalytic activity was achieved at natural pH, namely a 55 % average conversion of ciprofloxacin in 1.8 min of residence time and under 500 W m(-2). Some of the photocatalytic activity was attributed to Fe2+ leaching from the magnetic nanoparticles to the solution.
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