Increasing rutile phase amount in chromium-doped titania by simple stirring approach for photodegradation of methylene blue under visible light
The amount of rutile phase in chromium-doped titania photocatalyst was controlled by varying stirring time (0.5-2.0h) at room temperature during a sol-gel synthesis process. The percentage of rutile phase increased from 15.1% to 28.6% when stirring time was prolonged from 0.5 to 1.5h. Further increa...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Published: |
CSIRO Publishing
2015
|
| Subjects: |
| _version_ | 1796860229209554944 |
|---|---|
| author | Koh, Pei Wen Yuliati, Leny Lintang, Hendrik Oktendy Lee, Siew Ling |
| author_facet | Koh, Pei Wen Yuliati, Leny Lintang, Hendrik Oktendy Lee, Siew Ling |
| author_sort | Koh, Pei Wen |
| collection | ePrints |
| description | The amount of rutile phase in chromium-doped titania photocatalyst was controlled by varying stirring time (0.5-2.0h) at room temperature during a sol-gel synthesis process. The percentage of rutile phase increased from 15.1% to 28.6% when stirring time was prolonged from 0.5 to 1.5h. Further increases in the stirring time had negligible effect on the rutile phase amount. As evidenced by analyses using diffuse reflectance ultraviolet-visible spectroscopy and X-ray photoelectron spectroscopy, a sufficient stirring time was important for more substitution of Cr3+forTi4+ in the lattice, resulting in anatase-to-rutile phase transformation. The formation of more rutile phase in Cr-doped TiO2 not only reduced the band gap energy, but also induced surface defects that retarded electron-hole recombination. It has been demonstrated that the Cr-doped TiO2 prepared with a stirring time of 1.5h possessed the lowest band gap energy of 1.89eV, and hence it achieved the highest photodegradation of methylene blue under visible light irradiation |
| first_indexed | 2024-03-05T19:38:49Z |
| format | Article |
| id | utm.eprints-55824 |
| institution | Universiti Teknologi Malaysia - ePrints |
| last_indexed | 2024-03-05T19:38:49Z |
| publishDate | 2015 |
| publisher | CSIRO Publishing |
| record_format | dspace |
| spelling | utm.eprints-558242017-08-25T03:02:57Z http://eprints.utm.my/55824/ Increasing rutile phase amount in chromium-doped titania by simple stirring approach for photodegradation of methylene blue under visible light Koh, Pei Wen Yuliati, Leny Lintang, Hendrik Oktendy Lee, Siew Ling QD Chemistry The amount of rutile phase in chromium-doped titania photocatalyst was controlled by varying stirring time (0.5-2.0h) at room temperature during a sol-gel synthesis process. The percentage of rutile phase increased from 15.1% to 28.6% when stirring time was prolonged from 0.5 to 1.5h. Further increases in the stirring time had negligible effect on the rutile phase amount. As evidenced by analyses using diffuse reflectance ultraviolet-visible spectroscopy and X-ray photoelectron spectroscopy, a sufficient stirring time was important for more substitution of Cr3+forTi4+ in the lattice, resulting in anatase-to-rutile phase transformation. The formation of more rutile phase in Cr-doped TiO2 not only reduced the band gap energy, but also induced surface defects that retarded electron-hole recombination. It has been demonstrated that the Cr-doped TiO2 prepared with a stirring time of 1.5h possessed the lowest band gap energy of 1.89eV, and hence it achieved the highest photodegradation of methylene blue under visible light irradiation CSIRO Publishing 2015-02 Article PeerReviewed Koh, Pei Wen and Yuliati, Leny and Lintang, Hendrik Oktendy and Lee, Siew Ling (2015) Increasing rutile phase amount in chromium-doped titania by simple stirring approach for photodegradation of methylene blue under visible light. Australian Journal of Chemistry, 68 (7). pp. 1129-1135. ISSN 0004-9425 http://dx.doi.org/10.1071/CH14565 DOI:10.1071/CH14565 |
| spellingShingle | QD Chemistry Koh, Pei Wen Yuliati, Leny Lintang, Hendrik Oktendy Lee, Siew Ling Increasing rutile phase amount in chromium-doped titania by simple stirring approach for photodegradation of methylene blue under visible light |
| title | Increasing rutile phase amount in chromium-doped titania by simple stirring approach for photodegradation of methylene blue under visible light |
| title_full | Increasing rutile phase amount in chromium-doped titania by simple stirring approach for photodegradation of methylene blue under visible light |
| title_fullStr | Increasing rutile phase amount in chromium-doped titania by simple stirring approach for photodegradation of methylene blue under visible light |
| title_full_unstemmed | Increasing rutile phase amount in chromium-doped titania by simple stirring approach for photodegradation of methylene blue under visible light |
| title_short | Increasing rutile phase amount in chromium-doped titania by simple stirring approach for photodegradation of methylene blue under visible light |
| title_sort | increasing rutile phase amount in chromium doped titania by simple stirring approach for photodegradation of methylene blue under visible light |
| topic | QD Chemistry |
| work_keys_str_mv | AT kohpeiwen increasingrutilephaseamountinchromiumdopedtitaniabysimplestirringapproachforphotodegradationofmethyleneblueundervisiblelight AT yuliatileny increasingrutilephaseamountinchromiumdopedtitaniabysimplestirringapproachforphotodegradationofmethyleneblueundervisiblelight AT lintanghendrikoktendy increasingrutilephaseamountinchromiumdopedtitaniabysimplestirringapproachforphotodegradationofmethyleneblueundervisiblelight AT leesiewling increasingrutilephaseamountinchromiumdopedtitaniabysimplestirringapproachforphotodegradationofmethyleneblueundervisiblelight |