Amorphous titanium dioxide: a recyclable dye remover for water treatment
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Decolorization of dye solutions, crystal violet and congo red, were investigated using the synthesized amorphous titanium dioxide and compared with commercial titanium dioxides: Degussa P25 and anatase. Results showed that amorphous TiO2 had good adsorptivity that could decolorize the dye polluted water effectively mainly by adsorption. Decolorization by photocatalytic property was also detected but was very low. Concentrations of dye solutions used in this work were about ten times higher than normally used in other reports. After use, the particle surface was completely covered with dye molecules but this could be regenerated and the cleaned particles could be reused several times. Hydrogen peroxide and ultraviolet irradiation were used in the regeneration process.
KeywordsAmorphous titanium dioxide Titanium dioxide photocatalyst Dye adsorption Dye degradation Dye decolorization
This research is supported by the Thailand Research Fund through the Royal Golden Jubilee Ph.D. Program (Grant No.PHD/0126/2546 to M.K.); the Center for Innovation in Chemistry (PERCH-CIC), Commision on Higher Education, Ministry of Education; and the Graduate School of Prince of Songkla University (to both M.K. and S.B.). Sample of Degussa P25 used throughout this work was donated by Degussa AG, Frankfurt, Germany, through its agency in Bangkok, Thailand.
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