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According to thermogravimetric study it can be noted a change at 400C and other at 580C. No changes were seen at 500, so it is not explained how calcination temperatures were defined and why change occurs at 600 and 700C. Typically 400C the HT structure is destroyed around 400C, as is possible to see in the thermogravimetric study presented, but not 600C as mentioned in the text. Authors should mention the groups that could be being removed at each temperature, not only the percentage of mass loss. That analysis would give more information about the changes occurring in the material.


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