Photocatalytic activity of porous titania nanocrystals prepared by nanoscale permeation process in supercritical CO2: Effects of supercritical conditions |
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| Authors: | Youji Li Mingyuan Ma Xiaohua Wang Gongxi Chen |
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| Affiliation: | aCollege of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, Hunan, PR China |
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| Abstract: | Porous TiO2 nanocrystals (PTN) were synthesized using activated carbon templates with supercritical CO2 by using the nanoscale permeation (NP) process. The photoactivity of PTN was tested by methylene blue (MB) degradation. Compared with the commercially available P-25, all PTN exhibited significant photocatalytic degradation of MB mainly due to their porous structure with high surface area, high hydroxy concentration and small crystalline size. The optimum temperature and pressure are found to be 60 °C and 26 MPa, under which obtained PTN-1 shows the highest photoactivity and slow deactivation for MB degradation after 15 trials. |
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| Keywords: | Supercritical CO2 TiO2 nanocrystals Pores Photocatalysis Methylene blue |
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