Premium
Feasibility of Light‐emitting Diode Uses for Annular Reactor Inner‐coated with TiO 2 or Nitrogen‐doped TiO 2 for Control of Dimethyl Sulfide
Author(s) -
Jo WanKuen,
Eun SungSoo,
Shin SeungHo
Publication year - 2011
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2011.00965.x
Subject(s) - photocatalysis , light emitting diode , materials science , optoelectronics , visible spectrum , diode , absorption (acoustics) , catalysis , photochemistry , chemistry , biochemistry , composite material
Limited environmental pollutants have only been investigated for the feasibility of light‐emitting diodes (LED) uses in photocatalytic decomposition (PD). The present study investigated the applicability of LEDs for annular photocatalytic reactors by comparing PD efficiencies of dimethyl sulfide (DMS), which has not been investigated with any LED‐PD system, between photocatalytic systems utilizing conventional and various LED lamps with different wavelengths. A conventional 8 W UV/TiO 2 system exhibited a higher DMS PD efficiency as compared with UV‐LED/TiO 2 system. Similarly, a conventional 8 W visible‐lamp/N‐enhanced TiO 2 (NET) system exhibited a higher PD efficiency as compared with six visible‐LED/NET systems. However, the ratios of PD efficiency to the electric power consumption were rather high for the photocatalytic systems using UV‐ or visible‐LED lamps, except for two LED lamps (yellow‐ and red‐LED lamps), compared to the photocatalytic systems using conventional lamps. For the photocatalytic systems using LEDs, lower flow rates and input concentrations and shorter hydraulic diameters exhibited higher DMS PD efficiencies. An Fourier‐transformation infrared analysis suggested no significant absorption of byproducts on the catalyst surface. Consequently, it was suggested that LEDs can still be energy‐efficiently utilized as alternative light sources for the PD of DMS, under the operational conditions used in this study.