Effect of Molar Concentration of NH4OH on Photocatalytic Activity in Preparation of Nanosized TiO2 Powder from Spent Titanium Chip by Sol–Gel Method
| Autor: | Min-Chul Chung, Do-Jin Lee, Young-Ho Lee, Ki-Joong Kim, Ho-Geun Ahn, Hyeonjun Yun, Hwan-Gyu Lee, Byeong-Mo Kang, Jang-Ho Jo, Seong-Kyung Kim, Sang-Chul Jung, Woon-Jo Jeong, Hyeon-Jin Yu |
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| Rok vydání: | 2016 |
| Předmět: |
Anatase
Molar concentration Materials science Metallurgy Biomedical Engineering chemistry.chemical_element Bioengineering General Chemistry Condensed Matter Physics law.invention Absorbance chemistry Rutile law Photocatalysis General Materials Science Calcination Titanium BET theory Nuclear chemistry |
| Zdroj: | Journal of Nanoscience and Nanotechnology. 16:4643-4646 |
| ISSN: | 1533-4899 1533-4880 |
| Popis: | The TiO2 powder was prepared from the spent titanium chips by applying the sol-gel method. The spent titanium chip was dissolved in HCl solution, and then NH4OH solution was added. The molar concentration of NH4OH solution was 2 M, 4 M, 8 M, and 10 M. Obtained TiO2 powders were calcined at 200 degrees C, 400 degrees C, and 600 degrees C. The prepared TiO2 powder was characterized using a particle size analysis, BET surface area, and XRD analysis. The crystal structure of the TiO2 powder was rutile type and anatase. The highest BET surface area of TiO2 powder was 432.8 m2/g. The photocatalytic property of the TiO2 powder was evaluated as decomposition rate of methylene blue(MB) by using a liquid phase stirred reactor. UV source was a UV-A, and concentration of MB in most experiments was 8 ppm. The concentration of MB was measured by absorbance at 664 nm using UV spectroscopy. Photocatalytic efficiency of prepared TiO2 powder depended highly on concentration of NH4OH solution. The TiO2 powder prepared with 8 M-NH4OH solution showed the highest efficiency, the decomposition efficiency at decomposition time of 2 hr and MB concentration of pH 8 was 98%. |
| Databáze: | OpenAIRE |
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