Development of UV-LED/TiO2 Device and Their Application for Photocatalytic Degradation of Methylene Blue

Journal of Materials Engineering and Performance (Impact Factor: 1). 04/2013; 22(4):1035-1040. DOI: 10.1007/s11665-012-0344-7


The determination of design and operational conditions of ultraviolet light-emitting diode (UV-LED)/TiO2 device is the major concern for the development and potential application of the photocatalytic process. In this article, development of UV-LED/TiO2 device and their applications for photocatalytic degradation of methylene blue (MB) are reported. The UV-LED with an output wavelength of 376 nm was applied as the UV light source for the photocatalytic decomposition of because of. The photocatalytic behavior of the photocatalytic decomposition of because of in aqueous solution operated by the UV-LED/TiO2 device was studied under various conditions including initial dye concentration, the mass of catalyst, light power, and pH value. The decomposition of because of in aqueous solution by TiO2 photocatalytic process with the UV-LED was found to be technically and actually feasible. Besides, our results show a promising technique for organic waste-water treatment by the UV-LED/TiO2 method.

53 Reads
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Applied Surface Science j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / a p s u s c Utilization of tin and titanium incorporated rice husk silica nanocomposite as photocatalyst and adsorbent for the removal of methylene blue in aqueous medium a b s t r a c t A series of tin and titanium incorporated rice husk silica have been synthesized via sol–gel method using cetyltrimethylammonium bromide as the structure directing agent. The samples were labeled as RHA-Silica, RHA-10Sn, RHA-10Ti, and RHA-10Sn10Ti. The BET specific surface areas of these catalysts were found to be 315, 607, 439 and 255 (m 2 g −1) with type IV isotherms, respectively. The catalysts were found to be X-ray amorphous and the particle size was found to be in the nano range. Calcination of RHA-10Sn at 500 • C gave silica–tin nanotubes. RHA-10Sn10Ti showed the highest activity in the photocatalytic degradation of methylene blue (MB). The adsorption of MB on these catalysts was found to fit the pseudo-second order kinetic model. The adsorption rate was found to be strongly dependent on the pH of the solution.
    Applied Surface Science 10/2012; 264:718-726. DOI:10.1016/j.apsusc.2012.10.106 · 2.71 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: This study investigates a cross-section of TiO2 compositions for which existing evidence suggests the prospect of improved performance compared to standard Degussa P25. In the context of a program aimed toward a 365 nm LED based photo-reactor, the question is whether a distinctly superior photocatalyst composition for drinking water treatment is now available that would shape design choices. An answer was sought by synthesizing several photocatalysts with reported high reactivity in some context in the literature, and by performing photocatalysts reactivity tests using common pollutants of water system including Natural Organic Matter (NOM) and Emerging Contaminants (ECs) from the pesticide and pharmaceutical classes. 365 nm Light Emitting Diodes (LEDs) were used as the irradiation source. Since LEDs are now available in the UV, we did not examine the TiO2 modifications that bring band gap excitation into the region beyond 400 nm. The results suggest that the choice of the photocatalyst should be best made to fit the reactor design and photocatalyst mounting constraints such as mass transport, reactive surface, and light field. No photocatalyst composition overall, superior for all classes emerged.
    Catalysts 09/2013; 3(3):726-743. DOI:10.3390/catal3030726 · 2.00 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In this review, current progress in the area of photocatalysis using energy efficient Light Emitting Diodes (LEDs) as an irradiation source is discussed. LEDs are small in size, robust, do not contain mercury, have a longer life span than conventional light sources, and can operate on a direct current. These properties of LEDs offer a new alternative to traditional ultraviolet sources and open new possibilities for photocatalytic degradation with reduced power consumption, along with greater freedom in the design of various types of photocatalytic reactors. The present review mainly focuses on the photocatalytic degradation of organic compounds and dyes as well as the sterilization of microrganisms which are present in water and air, using irradiation by various types of LEDs, photocatalytic reactors, and catalysts. In addition, future prospects and challenges for the application of LEDs for to photocatalytic environmental pollutant degradation have been highlighted.
    Industrial & Engineering Chemistry Research 01/2014; 53(6):2073–2084. DOI:10.1021/ie404176g · 2.59 Impact Factor
Show more