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| sample name | postsynthetic treatment |
|---|---|
| T50 | 1 h at 500 °C in air (sample inserted and removed at this temperature) |
| T42 | 6 h at 420 °C (heating ramp 0.5 °C min–1), in air |
| T37O2 | 6 h at 370 °C (heating ramp 0.5 °C min–1), in O2 (30% in Ar) |
| UV | irradiating for 14 h by a medium-pressure Hg lamp (450 W) |
| AP | as-prepared sample |
| (BiO)2CO3 | commercial sample |
