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Synergetic effect of adsorption on degradation of malachite green dye under blue LED irradiation using spiral‐shaped photocatalytic reactor
Author(s) -
Jo WanKuen,
Park Gi Tae,
Tayade Rajesh J.
Publication year - 2015
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4547
Subject(s) - malachite green , photocatalysis , adsorption , degradation (telecommunications) , irradiation , photochemistry , catalysis , nuclear chemistry , ultraviolet , chemistry , slurry , ultraviolet light , materials science , chemical engineering , organic chemistry , optoelectronics , composite material , telecommunications , physics , computer science , nuclear physics , engineering
BACKGROUND 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 2 . 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. RESULTS 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 2 to the visible region (449 nm). The optimized degradation of 20 mg L ‐1 dye was observed at pH 8 using 0.5 g L ‐1 of catalyst under irradiation by ultraviolet and blue LEDs for 1 h and 3 h, respectively. CONCLUSION It was found that the synergistic effect of adsorption of malachite green dye on TiO 2 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