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Study of Photocatalytic Dye Degradation of Methylene Blue of Green Synthesized Zinc Oxide Using Chrysanthemum Grandiflorum

Students & Supervisors

Student Authors
Jannatul Mawa Rodela
Bachelor of Science in Computer Science & Engineering, FST
Syeda Tanha Hossain Progga
Bachelor of Science in Computer Science & Engineering, FST
H.m. Fahim
Bachelor of Science in Computer Science & Engineering, FST
Supervisors
Dr. Farzana Sabeth
Associate Professor, Faculty, FST
Bithi Paul
Assistant Professor, Faculty, FST

Abstract

Dye discharged into water resources from many industrial sources causes severe environmental damage, affecting both land and aquatic living creatures. Photocatalytic dye degradation process assisted by a green synthesized semiconductor depends on various parameters, like the nature and concentration of the organic substrate, concentration and type of the semiconductor, light source and intensity, pH, temperature, etc. Among several photocatalytic materials, green-synthesized zinc oxide (ZnO) has several advantages, and its catalytic properties were studied extensively as it has very high photochemical reactivity, low cost, and is non-toxic in nature. We report a single-pot green synthesis of zinc oxide (YCM-ZnO) nanoparticles using the aqueous flower extract of Chrysanthemum grandiflorum (locally called Chandramallika) as both the reducing, capping, and stabilizing agent. The synthesized nanoparticles were thoroughly characterized for their optical, structural, and morphological properties using UV–Visible spectroscopy (UV–Vis), Fourier transform infrared spectroscopy (FT–IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE–SEM) coupled with energy-dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). The photocatalytic properties of prepared YCM-ZnO nanoparticles were studied by using MB as a model organic pollutant by UV Irradiation. XRD analysis confirmed the formation of phase-pure ZnO nanostructures with a hexagonal wurtzite lattice, and Rietveld refinement revealed an average crystallite size of 47 nm for the synthesized YCM-ZnO nanoparticles. The optical bandgap was estimated to be 2.9 eV. Morphological studies using FESEM and TEM showed predominantly spherical to hexagonal-shaped particles, while FTIR spectra confirmed the presence of phytochemical capping agents from the extract. The YCM-ZnO nanoparticles demonstrated excellent photocatalytic activity, achieving 89% degradation of methylene blue under UV irradiation. These findings suggest that the green-synthesized YCM-ZnO nanoparticles hold strong potential as efficient photocatalysts.

Keywords

Flower extract nanoparticles Dye Photocatalytic degradation rate.

Publication Details

  • Type of Publication:
  • Conference Name: 1st International Conference on Science and Humanities for Sustainable Development
  • Date of Conference: 23/10/2025 - 23/10/2025
  • Venue: Dhaka University of Engineering & Technology, Gazipur
  • Organizer: Faculty of Science, DUET, Gazipur
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