Enhanced photocatalytic and antibacterial activity of TiO2 Quantum dots doped with Cerium/Chitosan for Environmental Remediation: Experimental and theoretical approaches

Muhammad Ikram*, Rimsha Raees, Ali Haider, Anwar Ul-Hamid, Junaid Haider, Iram Shahzadi, Walid Nabgan*, Souraya Goumri-Said, Mohammed Benali Kanoun, Salamat Ali

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The co-precipitation approach was adopted to synthesize ternary nanocomposites composed of Cerium-Ce, Chitosan-CS, and TiO2 quantum dots (QDs). Different Ce concentrations (2 and 4 wt %) were doped into the fixed amounts of CS and TiO2 QDs. The purpose of the current work was to assess the antimicrobial and photocatalytic activities of Ce/CS-TiO2. The XRD study confirmed the tetragonal structure of TiO2, whereas the presence of dopants (CS and Ce) in TiO2 resulted in a decrease in crystallite size. The microstructural examination of the composites through HR-TEM suggested the formation of quantum dot structures. FTIR revealed the functional groups presence in the synthesized product and absorption spectra were collected through UV–vis spectrophotometer accompanied redshift therefore, decreased in band gap energy of Ce and CS doped TiO2 was observed. PL spectroscopy was used to identify trap locations and charge carrier migration. SEM-EDS analysis validated the presence of dopants in the product and confirmed elemental composition. After incorporating 2% Ce into CS-TiO2, the MB dye dissolved considerably, dye degradation was of 97% in basic medium. Significant antibacterial activity was observed against both Staphylococcus aureus and Escherichia coli (S.A and E.A) bacteria. The adsorption energies of the CS/Ce–TiO2 nanocomposites were investigated using density functional theory, revealing the formation of stable structures.

Original languageEnglish
Article number127462
JournalMaterials Chemistry and Physics
Volume297
DOIs
StatePublished - 1 Mar 2023

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Bactericidal
  • Chitosan
  • Density functional theory
  • Inorganic semiconductor
  • Photocatalysis

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics

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