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Microstructural evolution of metatitanic acid with temperature and its photosensitization property

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Abstract

Metatitanic acid (MTA) powder was heat-treated up to 800 °C in air, and the resultant evolutions of crystalline phase, specific surface area, and pore size were investigated. MTA loses its weight in two steps; the first one (12.4 %) from 100 to 542 °C and the second one (5.2 %) from 542 to 900 °C. Both of the two stages are due to the elimination of water molecules, while the second-stage weight loss is also associated with the removal of SO4 2− ions present in MTA. As the heating temperature was elevated to 800 °C, the average pore diameter increased from 3.14 to 15.50 nm, while the specific surface area decreased from 377.3 to 54.5 m2/g. The change of these properties was most pronounced from around the temperature at which the second-stage water loss starts (542 °C). The visible-light photosensitization of rhodamine (RhB) dye on the surfaces of a partially de-hydrated MTA (heat-treated at 400 °C) was superior to that of commercial P-25 powder, indicating the potential of the partially de-hydrated mesoporous MTA with high specific surface area for the applications where surface photosensitization is important.

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Notes

  1. The photosensitization is the process of initiating a reaction through the use of a light absorbing substance (e.g., dye) and transferring the energy to the desired reactants.

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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 & Technology Institute (KEITI).

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  1. Department of Materials Engineering, Gangneung-Wonju National University, Jughun-gil 7, Gangneung, Gangwon-do, 210-702, 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. Microstructural evolution of metatitanic acid with temperature and its photosensitization property. Reac Kinet Mech Cat 110, 237–249 (2013). https://doi.org/10.1007/s11144-013-0585-y

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