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Sustainable textile wastewater treatment using phyto-synthesized Zinc Oxide from Chrysanthemum grandiflorum

Students & Supervisors

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

Abstract

Dyes released into water bodies from various industrial sources cause serious environmental pollution, posing threats to both terrestrial and aquatic ecosystems. The photocatalytic degradation of dyes using green-synthesized semiconductors is influenced by multiple factors, including the type and concentration of the organic dye, catalyst dosage, nature of the semiconductor, light intensity and wavelength, pH, and temperature. Among different photocatalytic materials, green-synthesized zinc oxide (ZnO) has gained significant attention due to its superior photochemical activity, low production cost, environmental friendliness, and non-toxic behavior. In this study, we present a facile single-step green synthesis of zinc oxide (YCM-ZnO) nanoparticles utilizing the aqueous flower extract of Chrysanthemum grandiflorum (locally known as Chandramallika) as a natural reducing, stabilizing, and capping agent. The synthesized nanoparticles were systematically characterized to determine their optical, structural, and morphological features through 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 performance of YCM-ZnO nanoparticles was evaluated using methylene blue (MB) as a model dye pollutant under UV light irradiation. XRD patterns confirmed the formation of pure ZnO with a hexagonal wurtzite structure, and Rietveld refinement indicated an average crystallite size of 47 nm. The optical bandgap was found to be 2.9 eV. FESEM and TEM analyses revealed predominantly spherical to hexagonal morphologies, while FTIR spectra indicated phytochemical compounds from the extract on the nanoparticle surface. The YCM-ZnO nanoparticles exhibited outstanding photocatalytic efficiency, achieving 87% degradation of methylene blue under UV exposure, highlighting their strong potential as sustainable and effective photocatalysts.

Keywords

Flower extract nanoparticles Dye Photocatalytic degradation rate

Publication Details

  • Type of Publication:
  • Conference Name: 1st International Conference on Life and Earth Sciences for Sustainable Development (ICLESSD-2025)
  • Date of Conference: 18/12/2025 - 18/12/2025
  • Venue: Jagannath University
  • Organizer: Faculty of Life and Earth Sciences, Jagannath University
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