Physicochemical and Textural Characterization of Perchlorated and Persulphated Titania
Samples of perchlorated and persulphated rutile were obtained by soaking the solid in aqueous solutions of HClO 4 and (NH 4 ) 2 S 2 O 8 of 0.05 M, 0.10 M and 0.20 M concentration and characterized by XRD and FT-IR spectroscopic studies and by acidity and textural assessment. The XRD results indicate...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2000-11-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263617001493855 |
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| Summary: | Samples of perchlorated and persulphated rutile were obtained by soaking the solid in aqueous solutions of HClO 4 and (NH 4 ) 2 S 2 O 8 of 0.05 M, 0.10 M and 0.20 M concentration and characterized by XRD and FT-IR spectroscopic studies and by acidity and textural assessment. The XRD results indicated that the interaction of titania with the loaded anions, i.e. ClO − 2 and S 2 O 2- 8 , resulted in an increase in the volume of the unit cell mainly due to an increase in the c 0 value of the tetragonal crystal lattice. The IR spectra showed that both ClO − 2 and S 2 O 2- 8 anions were linked to the surface via bidentate bridging. Such behaviour created strong acidic sites as probed by pyridine (pK a = 5.3) whose number increased with increasing anion loading. The acidity of the perchlorated samples was higher than that of the persulphated materials. Textural analysis showed that the specific surface areas of both samples responded to the loading process to a lower extent than the total pore volume and correspondingly to the average hydraulic radius, since the latter changed in relation to the total pore volume. |
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| ISSN: | 0263-6174 2048-4038 |