Photocatalytic degradation of methyl orange by a multi-layer rotating disk reactor

C.-N. Lin, C.-Y. Chang, H.J. Huang, Din-ping Tsai, N.-L. Wu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)

Abstract

Introduction: Solar wastewater treatment based on photocatalytic reactions is a green process that utilizes renewable energy resources and minimizes secondary pollution. Reactor design plays an important role in promoting treatment efficiency and throughput density (based on unit volume of the reactor). Experimental: A rotating disk reactor that significantly increases the process efficiency has been designed and evaluated for application to photocatalytic decomposition of dye pollutants in aqueous solutions. In this process, a novel multi-layer rotating disk reactor (MLRDR) was presented. Photocatalyst (TiO2) particles are immobilized on the surfaces of disks. Within each layer of the reactor, methyl orange aqueous solution is allowed to flow from the center of the disk in a radial direction along the surface of the disk, which is rotating at high speed and is irradiated with UV lamps. The effluent is then directed to the center of another layer that lies underneath. Up to four stacked layers have been tested in this study, and the effects due to the number of the layers and volumetric flow rate on reaction conversion are investigated. Results and discussion: The efficiency of this photocatalytic reactor exhibits complex dependence on these parameters. With selected operating conditions, conversions greater than 95% can be achieved within seconds of residence time. Design equations of the reactor have been derived based on fluid dynamics and kinetic models, and the simulation results show promising scale-up potential of the reactor. © 2012 Springer-Verlag.
Original languageEnglish
Pages (from-to)3743-3750
Number of pages8
JournalEnvironmental Science and Pollution Research
Volume19
Issue number9
DOIs
Publication statusPublished - 1 Nov 2012
Externally publishedYes

Keywords

  • Fluid dynamics modeling
  • Kinetics modeling
  • Photocatalysis
  • Rotating disk reactor
  • Scale-up
  • Simulation
  • Wastewater

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

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