Green synthesis of N-doped ZnO@Zeolite nanocomposite for the efficient photo-adsorptive removal of toxic heavy metal ions Cr6+ and Cd2+

Vipin, Manviri Rani, Uma Shanker, Mika Sillanpää

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

This research addresses the escalating issue of heavy metal ions contamination in water sources, primarily caused by rapid industrial development. Notably toxic, even at very small quantities of Cr6+ and Cd2+ heavy metal ions can prove fatal to both human and aquatic life. To combat this, a novel N-ZnO@Zeolite nanocomposite was successfully synthesized using Azadirachta indica plant leaf extract through the green method. The nanocomposite exhibited remarkable potential for removing Cr6+ and Cd2+ ions from aqueous solutions. The research primarily revolved around assessing the photocatalytic reduction efficiency of N-ZnO@Zeolite for Cr6+ and Cd2+ heavy metal ions, considering varied factors such as pH, photocatalyst dose, pollutant concentrations, and temperature. The findings demonstrated excellent removal capabilities, achieving 93% for Cr6+ and 89% for Cd2+ ions. Optimal conditions were observed at pH approximately 2 for Cr6+ and 6 for Cd2+, stirring for 60 min in an incubator at 45 °C, with 15 mg catalyst dose. The photocatalytic reduction kinetics were described by the first-order kinetics and Langmuir-Hinshelwood model with R2 (0.98982 and 0.9955), K (0.89786 h−1 & 0.87382 h−1), and t1/2 (0.7718 h or 46 min. & 0.7930 h or 48 min.) for Cr6+ and Cd2+, respectively. The isotherm models Langmuir and Freundlich are in good agreement with the experiment results, according to the equilibrium tests. Using a green synthesized photocatalyst for up to 10 cycles proved its long-term sustainability and excellent efficiency for environmental and industrial applications in the future.

Original languageEnglish
Article number111401
JournalInorganic Chemistry Communication
Volume157
DOIs
Publication statusPublished - Nov 2023

Keywords

  • Azadirachta indica
  • Cadmium
  • Chromium
  • Green method
  • Heavy metals
  • N-ZnO@Zeolite

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Green synthesis of N-doped ZnO@Zeolite nanocomposite for the efficient photo-adsorptive removal of toxic heavy metal ions Cr6+ and Cd2+'. Together they form a unique fingerprint.

Cite this