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Ciprofloxacin degradation in photo-Fenton and photo-catalytic processes: Degradation mechanisms and iron chelation

Journal of Environmental Sciences 2019年第6期31卷 82-92页

作者： Ardhendu Sekhar Giri animes kumar golder Department of Chemical Engineering Indian Institute of Science Education and Research Bhopal Department of Chemical Engineering Indian Institute of Technology Guwahati

Ciprofloxacin(CIP)is a broad spectrum synthetic antibiotic drug of fluoroquinolones class.CIP can act as a bidentate ligand forming iron complexes during its degradation in the photoFenton process(PFP).This work investigates on PFP for the degradation of CIP to understand the formation mechanism and stability of iron complexes under ultraviolet(UV)-light illumination.A comparison was made with the UV-photocatalysis(UV/TiO_2)process where CIP doesn't form a complex.In PFP,the optimal dose of Fe^(2+)and H_2O_2were found to be 1.25 and10 mmol/L with pH of 3.5.An optimal TiO_2dose of 1.25 g/L was determined in the UV/TiO_2process.Maximum CIP removal and mineralization efficiency of 93.1%and 47.3%were obtained in PFP against 69.7%and 27.6%in the UV/TiO_2process.The mass spectra could identify seventeen intermediate products including iron-CIP complexes in PFP,and only seven intermediate products were found in the UV/TiO_2process with a majority of common products in both the processes.The proposed mechanism supported by the mass spectra bridged the routes of CIP cleavage in the PFP and UV/TiO_2process,and the decomposition pathway of Fe^(3+)-CIP chelate complexes in PFP was also elucidated.Both in PFP and UV/TiO_2processes,the target site of HO~·radical attack was the secondary-N atom present in the piperazine ring of the CIP molecule.The death of Escherichia coli bacteria was 55.7%and 66.8%in comparison to the control media after 45 min of treatment in PFP and UV/TiO_2process,respectively.

关键词： Advanced oxidation processes Antibiotic decomposition Iron chelation Antimicrobial activity

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Arsenic Removal from Contaminated Water by Various Physicochemical Processes

Arsenic Removal from Contaminated Water by Various Physicoch...

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作者： Pandu Ranga Rao Nzanthung Ngullie A.K.golder Pranab kumar Ghosh the Department of Civil Engineering Indian Institute of Technology the Department of Chemical Engineering Indian Institute of Technology

Efficiency of ion exchange, electro membrane, and electrochemical ion-exchange(EIX) processes on arsenic removal were evaluated in laboratory. Batch studies were performed with chloride(IRA410) as well as hydroxyl(modified IRA410) exchangeable forms of anion exchange resins(AER), whereas, column study was done with only hydroxyl exchangeable AER to evaluate its performance on arsenic removal. A plate and frame type electrolytic cell with ruthenium dioxide coated titanium plates(RuO/Ti) as anode, and stainless steel plates as cathode, was fabricated to do experiment to evaluate the performance on arsenic removal by electro membrane as well as EIX processes. Though, As(V) removal was significant during batch kinetic study, As(III) removal was poor by both the AER. Breakthrough curves were developed by passing As(V) contaminated water at a flow rate of 5 ml/min through 3 different bed depths of 5 cm, 7.5 cm, and 10 cm of modified IRA410 columns having 1 cm internal diameter. The columns could efficiently remove from 500 μg/l of As(V) contaminated water to below 10 μg/l. In electro membrane process, effects of electrolyte concentration, effects of applied voltage, and initial concentration of As(V) were evaluated. EIX process was found to be inefficient in removing As(V) from contaminated water.

关键词： Arsenic ion-exchange EIX BDST

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