Degradation of metronidazole in aqueous solution by nano-ZnO/UV photocatalytic process

Farzadkia, Mahdi; Esrafili, Ali; Baghapour, Mohammad Ali; Shahamat, Yousef Dadban; Okhovat, Niloofar

doi:10.1080/19443994.2013.810322

Cited by 80 publications

(34 citation statements)

References 21 publications

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“…These findings illustrate that the biodegradability of MNZ markedly ameliorated after a reaction time in COP and it was converted to a biodegradable waste. Farzadkia et al [41] improved the biodegradability of MNZ solution from approximately 0 to 0.091 by nano-ZnO/UV photocatalytic process within 180 min.…”

Section: Biodegradability and Mineralizationmentioning

confidence: 99%

Heterogeneous catalytic ozonation by Nano-MgO is better than sole ozonation for metronidazole degradation, toxicity reduction, and biodegradability improvement

Kermani

Asl

Farzadkia

et al. 2016

Desalination and Water Treatment

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2015): Heterogeneous catalytic ozonation by Nano-MgO is better than sole ozonation for metronidazole degradation, toxicity reduction, and biodegradability improvement, Desalination and Water Treatment, In the current paper, the removal efficiency of metronidazole (MNZ) using a catalytic ozonation process (COP) in the presence of magnesium oxide nanocrystals, as a catalyst, was investigated in deionized water and compared with a sole ozonation process (SOP). The influence of several operational factors on both removal processes was evaluated: solution pH, MgO dosage, initial MNZ concentration, and reaction time. Biodegradability improvement, mineralization rate, oxidation intermediates, and toxicity were also studied for the COP. The results showed that MgO nanocrystals accelerated MNZ removal compared to the SOP. The optimum pH for both SOP and COP was obtained at 10 and optimum MgO dosage for the COP was determined 0.25 g/L. Under optimum conditions, after 20 min and 35 min, the complete removal of 40 mg/L MNZ solution occurred in COP and SOP, respectively. The COP significantly increased the biological oxygen demand/chemical oxygen demand ratio (from 0.09 to 0.43), caused 93.5% MNZ mineralization, and reduced the toxicity of the MNZ.

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Section: Biodegradability and Mineralizationmentioning

confidence: 99%

Heterogeneous catalytic ozonation by Nano-MgO is better than sole ozonation for metronidazole degradation, toxicity reduction, and biodegradability improvement

Kermani

Asl

Farzadkia

et al. 2016

Desalination and Water Treatment

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“…MNZ cannot be completely removed by sewage treatment plants because of its poor biodegradability. Alternative processes such as adsorption, Fenton/UV, zero‐valent iron reduction, gamma irradiation, and heterogeneous photocatalysis, have been proposed to treat MNZ contamination. However, these processes have respective drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Degradation of metronidazole by radio frequency discharge in an aqueous solution

Wang

Lin

et al. 2017

Plasma Processes & Polymers

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Degradation of metronidazole (MNZ) by radio frequency discharge in water was examined. Results showed that • OH, H • , and • O were produced. Decay of MNZ followed pseudo-first order kinetics, where the apparent rate constant was independent of its initial concentration in the range 0-0.5 mM, decreased in the range 0.5-1.0 mM, and leveled off in the range higher than 1.0 mM. pH had no effects on MNZ degradation. • OH scavengers enhanced the MNZ removal. Formic acid, nitrite ion, oxalic acid, nitrate ion, and acetic acid were determined as the primary intermediate byproducts. The eventual products were ammonia and inorganic carbon. Both • OH and H • participated in the MNZ degradation. H • played more efficient role than • OH in the early stage.

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“…Various kinds of intrinsic defects such as oxygen interstitials, oxygen vacancies, zinc interstitials, zinc vacancies and defects in ZnO contribute to the better emitting properties help to set up a highly efficient catalytic system for the removal of recalcitrant environmental contaminants [237][238][239]. For example, metronidazole was degraded photo catalytically using nano ZnO in wastewater with the mineralization efficiency and reduction in chemical oxygen demand by 96.5% and 95.4% respectively [240]. Similarly, a successful degradation of metamitron pesticide was achieved using ZnO NPs exposed to UV irradiations (300W) [241].…”

Section: Zinc Oxide (Zno) Based Nanomaterialsmentioning

confidence: 99%

Removal of Pharmaceutical Contaminants in Wastewater Using Nanomaterials: A Comprehensive Review

Chauhan

Sillu

Agnihotri

2019

CDM

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Background: The limitless presence of pharmaceutical contaminants in discharged wastewater has emerged as a threat to aquatic species and humans. Their presence in drinking water has although raised substantial concerns, very little is known about the fate and ecological impacts of these pollutants. As a result, these pollutants are inevitably introduced to our food chain at trace concentrations. Unfortunately, the conventional wastewater treatment techniques are unable to treat pharmaceuticals completely with practical limitations. The focus has now been shifted towards nanotechnology for the successful remediation of these persistent pollutants. Thus, the current review specifically focuses on providing readers brief yet sharp insights into applications of various nanomaterials for the removal of pharmaceutical contaminants. Methods: An exhaustive collection of bibliographic database was done with articles having high impact and citations in relevant research domains. An in-depth analysis of screened papers was done through standard tools. Studies were categorized according to the use of nanoscale materials as nano-adsorbents (graphene, carbon nanotubes), nanophotocatalysts (metal, metal oxide), nano-filtration, and ozonation for promising alternative technologies for the efficient removal of recalcitrant contaminants. Results: A total of 365 research articles were selected. The contemporary advancements in the field of nanomaterials for drinking and wastewater treatment have been thoroughly analyzed along with their future perspectives. Conclusion: The recommendations provided in this article will be useful to adopt novel strategies for on-site removal of the emerging contaminants in pharmaceutical effluents and related industries.

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Degradation of metronidazole in aqueous solution by nano-ZnO/UV photocatalytic process

Cited by 80 publications

References 21 publications

Heterogeneous catalytic ozonation by Nano-MgO is better than sole ozonation for metronidazole degradation, toxicity reduction, and biodegradability improvement

Heterogeneous catalytic ozonation by Nano-MgO is better than sole ozonation for metronidazole degradation, toxicity reduction, and biodegradability improvement

Degradation of metronidazole by radio frequency discharge in an aqueous solution

Removal of Pharmaceutical Contaminants in Wastewater Using Nanomaterials: A Comprehensive Review

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