V2O5/RGO/Pt nanocomposite on oxytetracycline degradation and pharmaceutical effluent detoxification

BACKGROUND Antibiotics have been identified as significant pollutants owing to their adverse impact on the environment through the development of antibiotic‐resistant bacteria. In a previous study, an e‐waste‐based reduced graphene oxide‐V2O5‐platinum (RGOV‐Pt(1%)) nanocomposite was prepared and sub...

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Published in:Journal of chemical technology and biotechnology (1986) 2020-01, Vol.95 (1), p.297-307
Main Authors: Mohan, Harshavardhan, Lim, Jeong‐Muk, Lee, Se‐Won, Cho, Min, Park, Yool‐Jin, Seralathan, Kamala‐Kannan, Oh, Byung‐Taek
Format: Article
Language:English
Subjects:
Additives
Anions
Antibiotics
Aqueous solutions
Biodegradation
Detoxification
Efficiency
Effluents
Environmental impact
Ethanol
Free radicals
Graphene
High performance liquid chromatography
Hydrogen peroxide
Hydroxyl radicals
Intermediates
Liquid chromatography
Low concentrations
Mass spectrometry
Mass spectroscopy
Nanocomposites
Organic chemistry
OTC
Oxytetracycline
pharmaceutical effluent
Pharmaceuticals
Photocatalysis
photocatalyst
Photodegradation
Platinum
Pollutants
Scavenging
Sodium carbonate
Sodium chloride
Vanadium pentoxide
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Summary:BACKGROUND Antibiotics have been identified as significant pollutants owing to their adverse impact on the environment through the development of antibiotic‐resistant bacteria. In a previous study, an e‐waste‐based reduced graphene oxide‐V2O5‐platinum (RGOV‐Pt(1%)) nanocomposite was prepared and subsequently used for the photocatalytic degradation of oxytetracycline (OTC), a tetracycline group of antibiotics. RESULTS This study aimed to assess the impact of additives such as H2O2, NaCl, Na2CO3, ethanol and persulfate on the photocatalytic degradation of OTC using RGOV‐Pt(1%) nanocomposite. The results showed that the degradation efficiency decreased in the presence of NaCl and Na2CO3 owing to the electron–hole scavenging property of their anions. Low concentrations of H2O2 (up to 10 mmol L–1) increased the OTC degradation efficiency, whereas high concentrations decreased the OTC degradation owing to the quenching of hydroxyl radicals. However, the presence of persulfate increased the OTC degradation efficiency owing to the formation of hydroxyl radicals. Furthermore, the OTC degradation pathway was elucidated using high‐performance liquid chromatography/tandem mass spectrometry (HPLC/MS/MS). The study was extended to real pharmaceutical effluent and the degradation efficiency was found to be less for real effluent (87%) in comparison with OTC (99%) in aqueous solution. CONCLUSION RGOV‐Pt(1%) photocatalyst effectively degraded OTC. An OTC degradation pathway was proposed based on the intermediates formed. The impact of additives was established. Effective real pharmaceutical effluent detoxification was observed. Thus the synthesized RGOV‐Pt(1%) nanocomposite is a hopeful alternative for the removal of antibiotics in contaminated waters and sites. © 2019 Society of Chemical Industry
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.6238