de Paula et al.
7
Vol. 00, No. 00, 2009
simple: the high powered LED used emits in wavelengths
near to the peak methylene blue absorption aside from
having high fluency. The system that uses a halogen bulb
presents low photonic emissions, even though other optic
filters may be used.
High powered LED are more effective photochemically
aside from showing cost advantages and set up practicality.
Acknowledgments
The authors are indebted to Prof. Dr. Antonio Eduardo
da Hora Machado for his valuable contribution to this
study. To Laboratório de Fotoquímica and Laboratório
de Fotoquímica de Lignocelulósicos from Universidade
Federal de Uberlândia, for the concession of the infra-
structure and materials. To CNPq, FAPEMIG and Nanobrax
(www.nanobrax.com) for research support.
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Received: June 6, 2009
Web Release Date: December 21, 2009