Facile solid state synthesis of ZnO hexagonal nanogranules with excellent photocatalytic activity

Manoj Pudukudy, Zahira Yaakob

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

In this article, ZnO nanogranules were synthesised rapidly by the thorough solid state mixing of nitrate precursor with citric acid followed by aging and calcination at two different temperatures of 400 C and 600 C. Here, citric acid played a superior role in the development of porous ZnO nanostructures. The ZnO nanogranules obtained in this way were characterised by different techniques. X-ray diffraction patterns indicated a hexagonal wurtzite structure of ZnO with high crystallinity and nanocrystalline size. Scanning and transmission electron microscopy images indicated the uniformly well separated hexagonal morphology of the ZnO nanoparticles, with granular shape. BET surface area-porosity analysis confirmed the presence of a mesoporous network in both samples, with high surface area and a monomodal pore size distribution. Room temperature Photoluminescence spectra of the samples exhibited characteristic blue and green emission bands in accordance with the calcination temperature. The photocatalytic performance of the ZnO nanogranules was studied using methylene blue degradation and found that the ZnO prepared at 400 C exhibited higher photocatalytic activity due to its high surface area and more oxygen vacancies. High concentrations of several hazardous dye pollutants were effectively degraded, when the solution was passed over 50 mg of ZnO nanogranules under UV-light illumination.

Original languageEnglish
Pages (from-to)520-530
Number of pages11
JournalApplied Surface Science
Volume292
DOIs
Publication statusPublished - 15 Feb 2014

Fingerprint

Citric acid
Citric Acid
Calcination
Methylene Blue
Oxygen vacancies
Ultraviolet radiation
Nitrates
Temperature
Diffraction patterns
Pore size
Nanostructures
Photoluminescence
Coloring Agents
Dyes
Porosity
Aging of materials
Lighting
Nanoparticles
Transmission electron microscopy
X ray diffraction

Keywords

  • Citric acid
  • Industrial dyes
  • Optical properties
  • Photodegradation
  • Solid state synthesis
  • ZnO nanogranules

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this

Facile solid state synthesis of ZnO hexagonal nanogranules with excellent photocatalytic activity. / Pudukudy, Manoj; Yaakob, Zahira.

In: Applied Surface Science, Vol. 292, 15.02.2014, p. 520-530.

Research output: Contribution to journalArticle

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