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pH-dependent absorbance of a centrifuged rhodamine B-TiO2 suspension, and a practical filtration method with minimized dye loss in a dye decoloration test

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Abstract

Although the centrifugation of a rhodamine B (RhB)-TiO2 suspension cannot separate TiO2 particles completely, the UV/Vis absorbance of the residual TiO2 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 TiO2 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 TiO2, but also a part of the dye. A practical recipe for the successful microfiltration of TiO2 powder with a minimal loss of dye from the acidic suspension has been proposed and its feasibility has been validated.

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Acknowledgments

This work was financially supported by the Geo Advanced Innovative Action (GAIA) Project (No. RE201202040), funded by the Ministry of Environment of Korea through the Soil Environment Center at Korea Environmental Industry and Technology Institute (KEITI).

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Authors and Affiliations

  1. Department of Materials Engineering, Gangneung-Wonju National University, Jughun-gil 7, Gangneung, 210-702, Gangwon-do, Republic of Korea

    Se-Keun Park & Hyunho Shin

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  1. Se-Keun Park
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  2. Hyunho Shin
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Correspondence to Hyunho Shin.

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Park, SK., Shin, H. pH-dependent absorbance of a centrifuged rhodamine B-TiO2 suspension, and a practical filtration method with minimized dye loss in a dye decoloration test. Reac Kinet Mech Cat 111, 361–370 (2014). https://doi.org/10.1007/s11144-013-0632-8

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  • DOI: https://doi.org/10.1007/s11144-013-0632-8

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