Vol. 25 No. 1 (2026): Mapana Journal of Sciences
Research Articles

Electrochemically active chitosan loaded PbS NPs with effective degradation against methylene blue dye and E.coli bacteria disinfection

  • N. Manjula,
  • N. Arunkumar,
  • A.R. Balu,
  • S. Ganesan,
  • K. Devendran,
  • M. Sriramraj,
  • A. Vinith,
  • V. Rajamani
A.R. Balu
A Veeriya Vandayar Memorial Sri Pushpam College, Poondi

Published 2026-02-14

Keywords

  • Chitosan,
  • cationic polymer,
  • XRD,
  • photodegradation,
  • bacterial inhibition,
  • specific capacitance
    • ...More
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Copyright (c) 2026

Creative Commons License

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Abstract

This paper reports the photocatalytic, electrochemical and antibacterial properties of cubic crystal structured pure PbS and chitosan, a cationic polymer loaded PbS NPs synthesized by chemical precipitation method. Chitosan loading decreased the crystallite size of pure PbS from 34 to 27 nm. The occurance of п-plasmon with chitosan loading shifted the absorption edge of pure PbS to higher wavelength side and decreased the band gap from 1.94 to 1.87 eV. PbS’s degradation efficiency against MB dye under visible light with chitosan loading increased from 83.2 to 92 % and the degradation rate constants were 0.0178 and 0.0241 min-1 respectively for pure PbS and chitosan loaded PbS NPs. Specific capacitance of pure PbS increased from 71.3 to 97.8 F/g with chitosan loading due to the synergetic effect between PbS and chitosan bio-polymer. With the presence of free hydroxyl groups in chitosan, more ROS are generated in the chitosan loaded PbS NPs resulting in enhanced antibacterial activity.

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