Photodegradation of norfloxacin in aqueous and organic solvents: A kinetic study

Ahmad, Iqbal; Bano, Raheela; Musharraf, Syed Ghulam; Sheraz, Muhammad Ali; Ahmed, Sofia; Tahir, Hajra; Arfeen, Qamar ul; Bhatti, Muhammad Salman; Shad, Zufi; Hussain, S.

doi:10.1016/j.jphotochem.2015.01.005

Cited by 35 publications

(26 citation statements)

References 37 publications

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“…Clearly, the HO concentration in the anodic reaction zone [48] is sufficient to promote the almost complete mineralization of NOR, independently of the characteristics of the BDD anode. The main detected intermediate compounds, whose absolute intensities were very low, resulted from hydroxylation reactions in the quinolone and piperazine rings of the parent compound; these intermediates were also detected when the degradation of NOR was carried out by other methods [49][50][51][52][53]. The chemical structure of the compound of m/z 348 was not confirmed by MS/MS analyses due to its low detected amount.…”

Section: Effect Of the Doping Level Of Bdd Anodesmentioning

confidence: 98%

Electrochemical mineralization of norfloxacin using distinct boron-doped diamond anodes in a filter-press reactor, with investigations of toxicity and oxidation by-products

Coledam

Aquino

Silva³

et al. 2016

Electrochimica Acta

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The contamination of water bodies by antibiotics is a cause of concern due to chronic toxic effects and the possible development of resistance to them by microorganisms, which can lead to serious health problems to humans. Thus, in this work, for the first time the degradation of norfloxacin (100 mg L À1 NOR in 0.1 mol L À1 Na 2 SO 4) is carried out electrochemically, using a filter-press flow reactor with boron-doped diamond (BDD) anodes of distinct characteristics. The investigated variables (and their ranges) were solution pH (3, 7, 10, and without specific control), current density (10, 20, and 30 mA cm À2), temperature (10, 25, and 40 C), and boron content-sp 2 /sp 3 carbon ratio of the BDD anode (100 ppm-215, 500 ppm-325, and 2500 ppm-284). The NOR electrodegradation performance of the distinct anodes was assessed by monitoring the degradation by-products (aromatic compounds and carboxylic acids), NOR concentration and total organic carbon concentration of the electrolyzed solutions, as well as their toxicity to Escherichia coli (i.e. growth inhibition). For the complete removal of NOR, the best condition (not pH dependent) was attained at 10 mA cm À2 and 40 C, when the system is under mass transfer limitations. Concerning NOR oxidation and mineralization rates, mineralization current efficiency, energy consumption, and degradation products, similar results (including the complete detoxification of the electrolyzed solution) were attained for all tested BDD anodes under mass or charge transfer controlled processes. Clearly, the oxidation power of the tested BDD anodes is not affected by the values of their boron content-sp 2 /sp 3 carbon ratio.

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Section: Effect Of the Doping Level Of Bdd Anodesmentioning

confidence: 98%

Electrochemical mineralization of norfloxacin using distinct boron-doped diamond anodes in a filter-press reactor, with investigations of toxicity and oxidation by-products

Coledam

Aquino

Silva³

et al. 2016

Electrochimica Acta

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“…However, heterogeneous photocatalysis method is an eco-friendly method, high energy consumption, gigantic efficiency and low-cost technique for the degradation or reduction of organic pollutant into non-toxic compounds [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of Novel Sheet-like Iron Vanadate Photocatalyst for the Photoreduction of Chromium

2019

IJITEE

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In past days, the occurrence of toxic heavy metal ions into the water and soil environment causes major health risk to the living organisms. In this work, we mainly focused on the photoreduction of hexavalent chromium (Cr6+) using novel sheet-like Fe2V4O13 photocatalyst under visible light irradiation. The sheet-like Fe2V4O13 was tailored through hydrothermal process using ferric chloride and sodium metavanadate precursors without addition of any templates. The surface morphology, elemental analysis and various physical properties are characterized by numerous spectroscopic techniques. Interestingly, the sheet-like Fe2V4O13 demonstrated proficient photocatalytic performances towards the reduction of Cr6+ into Cr3+. The obtained UV-visible spectroscopy results portrayed that sheet-like Fe2V4O13 could reduce above of Cr6+ solution within 40 min. Moreover, the sheet-like Fe2V4O13 holds very good stability even after five consecutive cycles. This study could open new insights for the design novel nanostructured binary metal oxides for environmental applications.

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“…Many FQs exhibit different degrees of photosensitive property and can be potentially degraded by direct photolysis or photosensitization [ 19 , 20 , 21 ]. Various techniques have been combined with photolysis to improve the quantum yield in photodegradation, which include photocatalysts, electricity, ultrasound and the addition of oxidants (e.g., H 2 O 2 and ozone) [ 22 , 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Microwave-Enhanced Photolysis of Norfloxacin: Kinetics, Matrix Effects, and Degradation Pathways

Liao

Sharma

et al. 2017

IJERPH

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Degradation of norfloxacin (NOR) was studied using a combination of microwave and UV irradiation methods (MW/UV process). Remarkable synergistic effect was found between MW and UV light. The removal rate with the MW/UV process was much faster than that with UV light irradiation only. Degradation of NOR followed second-order kinetics and ~72% of NOR could be removed in the first 5 min of MW/UV reaction. Influence of inorganic ions (cations (K+, Mg2+, Ca2+, Cu2+) and anions (Cl−, SO42−, NO3−, CO32−)), humic acid (HA) and surfactants (cation, anion, and non-ionic) on the degradation of NOR by the MW/UV process was investigated. Among the ions, Cu2+ and NO3− ions inhibited the degradation of NOR. The presence of HA and surfactants in water showed a slight inhibition on the NOR removal. Furthermore, the NOR degradation in the MW/UV process was primarily caused by the ·OH-photosensitization steps. Seven intermediates formed by the oxidation of NOR were identified and three reaction pathways were proposed. Removals of NOR in tap water (TW), synthetic wastewater (WW), river water (RW), and seawater (SW) were also studied, which demonstrated that the MW/UV process was an effective oxidation technology for degrading fluoroquinolone antibiotics in different water matrices.

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Photodegradation of norfloxacin in aqueous and organic solvents: A kinetic study

Cited by 35 publications

References 37 publications

Electrochemical mineralization of norfloxacin using distinct boron-doped diamond anodes in a filter-press reactor, with investigations of toxicity and oxidation by-products

Electrochemical mineralization of norfloxacin using distinct boron-doped diamond anodes in a filter-press reactor, with investigations of toxicity and oxidation by-products

Design and Fabrication of Novel Sheet-like Iron Vanadate Photocatalyst for the Photoreduction of Chromium

Microwave-Enhanced Photolysis of Norfloxacin: Kinetics, Matrix Effects, and Degradation Pathways

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