Synergetic effect of adsorption on degradation of malachite green dye under blue LED irradiation using spiral‐shaped photocatalytic reactor. Issue 12 (8th October 2014)

• Record Type: Journal Article
• Authors: Jo, Wan‐Kuen; Park, Gi Tae; Tayade, Rajesh J.
• Is Part Of: Journal of chemical technology & biotechnology. Volume 90:Issue 12(2015:Dec.)
• Page Start: 2280
• Page End: 2289
• Publication Date: 2014-10-08
• Subjects: Biotechnology -- Periodicals; Chemistry, Technical -- Periodicals; Chemical engineering -- Periodicals; Industries -- Environmental aspects -- Periodicals; 660
• DOI: 10.1002/jctb.4547
• Languages: English
• ISSNs: 0268-2575

Abstract

<abstract abstract-type="main" id="jctb4547-abs-0001"> <title>Abstract</title> <sec id="jctb4547-sec-0001" sec-type="section"> <title>BACKGROUND</title> <p id="jctb4547-para-0001">The present study focus on the development and feasibility of a blue light emitting diodes (LEDs) source based slurry type spiral‐shaped photocatalytic reactor for degradation of malachite green (MG) dye using P25 Degussa TiO<sub>2</sub><sub>.</sub> The influence of operational parameters such as amount of catalyst loading, initial concentration of dye, and pH of the medium has been studied for optimization of MG dye degradation.</p> </sec> <sec id="jctb4547-sec-0002" sec-type="section"> <title>RESULTS</title> <p id="jctb4547-para-0002">The photocatalytic degradation of malachite green dye under separate irradiation by blue and by ultraviolet LED was nearly the same (∼76%). The photocatalytic activity using blue LED irradiation was observed due to the synergistic effect of MG dye adsorption on P25 Degussa, which extends the spectral response of TiO<sub>2</sub> to the visible region (449 nm). The optimized degradation of 20 mg L<sup>‐1</sup> dye was observed at pH 8 using 0.5 g L<sup>‐1</sup> of catalyst under irradiation by ultraviolet and blue LEDs for 1 h and 3 h, respectively.</p> </sec> <sec id="jctb4547-sec-0003" sec-type="section"> <title>CONCLUSION</title> <p id="jctb4547-para-0003">It was found that the synergistic effect of adsorption of malachite green dye on TiO<sub>2</sub> surface helped to enhance photocatalytic degradation under blue LED irradiation. The application of a blue LED for photocatalytic degradation of malachite green dye is economical and feasible compared with use of an ultraviolet LED. © 2014 Society of Chemical Industry</p> </sec> </abstract>