pH-dependent absorbance of a centrifuged rhodamine B-TiO2 suspension, and a practical filtration method with minimized dye loss in a dye decoloration test
Although the centrifugation of a rhodamine B (RhB)-TiO 2 suspension cannot separate TiO 2 particles completely, the UV/Vis absorbance of the residual TiO 2 in the centrifuged suspension, under neutral and basic conditions, is not fully revealed under the presence of RhB molecules. Therefore, in a dy...
Saved in:
Published in | Reaction kinetics, mechanisms and catalysis Vol. 111; no. 1; pp. 361 - 370 |
---|---|
Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Dordrecht
Springer Netherlands
01.02.2014
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Although the centrifugation of a rhodamine B (RhB)-TiO
2
suspension cannot separate TiO
2
particles completely, the UV/Vis absorbance of the residual TiO
2
in the centrifuged suspension, under neutral and basic conditions, is not fully revealed under the presence of RhB molecules. Therefore, in a dye decoloration test, the centrifuged suspension can be used for estimating the concentration of RhB molecules based on the RhB absorbance peak in a Vis light regime. From acidic suspensions, however, the elimination of TiO
2
is so difficult that the centrifuged suspension results in a significant shift of the baseline of the RhB absorbance peak. An additional use of a microfilter removes not only the residual TiO
2
, but also a part of the dye. A practical recipe for the successful microfiltration of TiO
2
powder with a minimal loss of dye from the acidic suspension has been proposed and its feasibility has been validated. |
---|---|
ISSN: | 1878-5190 1878-5204 |
DOI: | 10.1007/s11144-013-0632-8 |