ZrO2@chitosan composite for simultaneous photodegradation of three emerging contaminants and antibacterial application

Ranjita S Das; Anupama Kumar; Atul V Wankhade; D R Peshwe

doi:10.1016/j.carbpol.2021.118940

ZrO₂@chitosan composite for simultaneous photodegradation of three emerging contaminants and antibacterial application

Carbohydr Polym. 2022 Feb 15:278:118940. doi: 10.1016/j.carbpol.2021.118940. Epub 2021 Nov 27.

Authors

Ranjita S Das¹, Anupama Kumar², Atul V Wankhade¹, D R Peshwe³

Affiliations

¹ Department of Chemistry, Visvesvaraya National Institute of Technology (VNIT), Nagpur 440010, India.
² Department of Chemistry, Visvesvaraya National Institute of Technology (VNIT), Nagpur 440010, India. Electronic address: anupamakumar@chm.vnit.ac.in.
³ Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), Nagpur 440011, India.

PMID: 34973758
DOI: 10.1016/j.carbpol.2021.118940

Abstract

Emerging contaminants (ECs) are often detected in water bodies due to their prevalent use combined with inefficiency of the conventional wastewater treatment plants for their complete removal. Elimination of ECs using photocatalysis as a tertiary treatment can be a sustainable option for the reuse wastewater. Reported herewith is a photocatalyst, chitosan-based zirconia hybrid composite (ZrO₂CTS-HC) for the individual/ simultaneous degradation of multiple ECs like Congo red (CR), Methyl orange (MO) and 4-hydroxybenzoic acid (4-HA) under visible light irradiation. Successfully synthesized ZrO₂CTS-HC as confirmed by theoretical and various characterization techniques depicted photodegradation efficiency of 91.11, 69.11 and 78.40% for CR, MO and 4-HA respectively (SD 0.5-0.95; HPLC) aided by the reactive hydroxyl radical. Probable degradation mechanism supported by LC-MS/MS, COD and TOC along with reusability and antibacterial ability towards E.Coli & S.aureus is also reported. ZrO₂CTS-HC can be a good option for elimination of residual ECs during tertiary treatment.

Keywords: Bacterial inactivation; Chitosan; Emerging contaminants; Hybrid composite; Simultaneous photodegradation; Zirconia.

MeSH terms

Anti-Bacterial Agents / chemistry
Anti-Bacterial Agents / pharmacology*
Azo Compounds / chemistry
Chitosan / chemistry
Chitosan / pharmacology*
Congo Red / chemistry
Escherichia coli / drug effects*
Light
Microbial Sensitivity Tests
Parabens / chemistry
Photochemical Processes
Staphylococcus aureus / drug effects*
Water Pollutants, Chemical / chemistry*
Water Purification
Zirconium / chemistry
Zirconium / pharmacology*

Substances

Anti-Bacterial Agents
Azo Compounds
Parabens
Water Pollutants, Chemical
Congo Red
methyl orange
Chitosan
Zirconium
4-hydroxybenzoic acid
zirconium oxide