TITLE:
Electrochemical and Photoelectrochemical Decoloration of Amaranth Dye Azo Using Composited Dimensional Stable Anodes
AUTHORS:
Moisés I. Salazar-Gastélum, Edgar A. Reynoso-Soto, Shui W. Lin, Sergio Perez-Sicairos, Rosa M. Félix-Navarro
KEYWORDS:
Photoelectrochemical; Decoloration; DSA, Azo; Amaranth Dye
JOURNAL NAME:
Journal of Environmental Protection,
Vol.4 No.1,
January
29,
2013
ABSTRACT:
In this paper we report the results of
our experimental work conducted to decoloration of a well-known highly toxic
Amaranth dye by electrochemical and photoelectrochemical methods. Throughout
this investigation were used two different Dimensional Stable Anode (DSA) electrodes, namely, IrO2-Ru2O-SnO2-TiO2/Ti
and Ru2O-SnO2-TiO2/Ti. The experimental
results show that IrO2-Ru2O-SnO2-TiO2/Ti
electrode has higher performance on amaranth decoloration than Ru2O-SnO2-TiO2/Ti
electrode, but with the disadvantage of higher energy consumption. For higher
degradation of Amaranth dye with both DSA electrodes, the process was carried
out via photoelectrochemical method. Our experimental results clearly shown the
decrease in absorbance of all UV-Vis peaks due to the mineralization of the azo
dye; also, it was noteworthy photoelectrochemical process consumes less energy
under the same experimental conditions than electrochemical process. The IrO2-Ru2O-SnO2-TiO2/Ti
electrode reaches a higher degradation degree of Amaranth solutions than Ru2O-SnO2-TiO2/Ti
electrode using a photoelectrochemical technique.