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Pharmaceuticals removal by immobilized laccase on polyvinylidene fluoride nanocomposite with multi-walled carbon nanotubes

Masjoudi, M ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.chemosphere.2020.128043
  3. Publisher: Elsevier Ltd , 2021
  4. Abstract:
  5. The presence of pharmaceutical micropollutants in water and wastewater is considered a serious environmental issue. To eliminate these pollutants, biodegradation of pharmaceuticals using enzymes such as laccase, is proposed as a green method. In this study, immobilized laccase was used for the removal of two model pharmaceutical compounds, carbamazepine and diclofenac. Polyvinylidene fluoride (PVDF) membrane modified with multi-walled carbon nanotubes (MWCNTs) were synthesized as a tailor-made support for enzyme immobilization. Covalently immobilized laccase from Trametes hirsuta exhibited remarkable activity and activity recovery of 4.47 U/cm2 and 38.31%, respectively. The results also indicated improvement in the operational and thermal stability of the immobilized laccase compared to free laccase. Finally, by using immobilized laccase in a mini-membrane reactor, removal efficiencies of 27% in 48 h and 95% in 4 h were obtained for carbamazepine and diclofenac, respectively. The findings suggest that immobilized laccase on PVDF/MWCNT membranes is a promising catalyst for large-scale water and wastewater treatment which is also compatible with existing treatment facilities. © 2020 Elsevier Ltd
  6. Keywords:
  7. Amides ; Biodegradation ; Bioreactors ; Enzyme immobilization ; Fluorine compounds ; Nanotubes ; Thermodynamic stability ; Wastewater treatment ; Water treatment ; Environmental issues ; Pharmaceutical compounds ; Polyvinylidene fluoride membranes ; Polyvinylidene fluorides ; Removal efficiencies ; Tailor-made supports ; Water and wastewater ; Water and wastewater treatments ; Multiwalled carbon nanotubes (MWCN) ; Carbamazepine ; Diclofenac ; Immobilized enzyme ; Multi walled nanotube ; Carbon nanotube ; Polyvinyl derivative ; Polyvinylidene fluoride ; Concentration (composition) ; Detection method ; Drug ; Enzyme ; Enzyme activity ; Immobilization ; Nanocomposite ; Pollutant removal ; Polymer ; Wastewater ; Biodegradation ; Catalyst ; Covalent bond ; Green chemistry ; Thermostability ; Waste component removal ; Waste water management ; Waste water treatment plant ; Water pollutant ; pH ; Polyporaceae ; Trametes hirsuta ; Enzymes, Immobilized ; Hydrogen-Ion Concentration ; Laccase ; Nanocomposites ; Nanotubes, Carbon ; Pharmaceutical Preparations ; Polyvinyls ; Trametes
  8. Source: Chemosphere ; Volume 263 , 2021 ; 00456535 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0045653520322384