Investigation of metal oxides toward organic dyes decolourisation and environmental remediation

Thiankhoon Tan, Poisim Khiew, Weesiong Chiu, Chinhua Chia

Research output: Contribution to journalConference article

Abstract

Enormous interest has been focused on metal oxides in its photocatalytic capabilities toward oxidizing organic dyes and environmental remediation. Zinc oxide (ZnO), titanium dioxide (TiO2) and iron oxide (Fe3O4) have been used as the heterogeneous photocatalysts to photodegrade three organic dyes, which are methylene blue (MB), phenol red (PR) and methyl orange (MO). Series of 3.0 ml dyes samples in aqueous solutions were placed into a UV chamber under UV-C (254 nm) light irradiation. The oxides powder was characterised by XRD, FESEM and TEM analysis, where ZnO nanoparticles was in hexagonal wurtzite crystal structure (SG: P63mc) with average crystalline size of (91-12) nm and TiO2 nanoparticles was pure anatase of tetragonal crystal structure (SG: I4/a md) with average crystalline size of (117-16) nm. Fe3O4 nanoparticles was in cubic spinel crystal structure with average crystalline size of (62.1-5.7) nm. The photocatalyst loading (0.5 - 3.5wt%), initial dye concentration (MB: 2 - 12 ppm, PR: 8 - 48 ppm, MO: 12 - 32 ppm) and irradiation duration on the decolourisation of dye samples were examined. Based on time requirement, the photocatalytic decolourisation rate increased with increasing metal oxide loading and decreased with the increasing of the initial dye concentration. The superior photocatalyst was ZnO with a loading of 2.5 wt% followed by TiO2 (3.0 wt%) and least photocatalytic capability was Fe3O4 (3.0 wt%). On the other hand, the most photostable dye is MO followed by PR and MB.

Original languageEnglish
Article number012023
JournalIOP Conference Series: Materials Science and Engineering
Volume544
Issue number1
DOIs
Publication statusPublished - 1 Jan 2019
Event2nd International Conference on Mechanical Engineering and Applied Composite Materials, MEACM 2018 - Harbin, China
Duration: 7 Dec 20188 Dec 2018

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Oxides
Coloring Agents
Dyes
Metals
Phenolsulfonphthalein
Zinc Oxide
Methylene Blue
Photocatalysts
Zinc oxide
Phenols
Crystal structure
Nanoparticles
Crystalline materials
Titanium dioxide
Irradiation
Environmental Restoration and Remediation
Iron oxides
Powders
Transmission electron microscopy
methyl orange

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

Cite this

Investigation of metal oxides toward organic dyes decolourisation and environmental remediation. / Tan, Thiankhoon; Khiew, Poisim; Chiu, Weesiong; Chia, Chinhua.

In: IOP Conference Series: Materials Science and Engineering, Vol. 544, No. 1, 012023, 01.01.2019.

Research output: Contribution to journalConference article

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