Immobilized soybean peroxidase hybrid biocatalysts for efficient degradation of various emerging pollutants

Rana Morsi, Khadega A. Al-Maqdi, Muhammad Bilal, Hafiz M.N. Iqbal, Abbas Khaleel, Iltaf Shah, Syed Salman Ashraf

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

In the present study, soybean peroxidase (SBP) was covalently immobilized onto two functionalized photocatalytic supports (TiO2 and ZnO) to create novel hybrid biocatalysts (TiO2SBP and ZnO-SBP). Immobilization caused a slight shift in the pH optima of SBP activity (pH 5.0 to 4.0), whereas the free and TiO2-immobilized SBP showed similar thermal stability profiles. The newly developed hybrid biocatalysts were used for the degradation of 21 emerging pollutants in the presence and absence of 1-hydroxy benzotriazole (HOBT) as a redox mediator. Notably, all the tested pollutants were not equally degraded by the SBP treatment and some of the tested pollutants were either partially degraded or appeared to be recalcitrant to enzymatic degradation. The presence of HOBT enhanced the degradation of the pollutants, while it also inhibited the degradation of some contaminants. Interestingly, TiO2 and ZnO-immobilized SBP displayed better degradation efficiency of a few emerging pollutants than the free enzyme. Furthermore, a combined enzymechemical oxidation remediation strategy was employed to degrade two recalcitrant pollutants, which suggest a novel application of these novel hybrid peroxidase-photocatalysts. Lastly, the reusability profile indicated that the TiO2-SBP hybrid biocatalyst retained up to 95% degradation efficiency of a model pollutant (2-mercaptobenzothiazole) after four consecutive degradation cycles.

Original languageEnglish
Article number904
JournalBiomolecules
Volume11
Issue number6
DOIs
Publication statusPublished - Jun 2021

Keywords

  • Biocatalysts
  • Emerging pollutants
  • Immobilization
  • Metal-oxide catalysts
  • Photocatalysts
  • Redox mediator
  • Soybean peroxidase

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology

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