Bonifacio-Martínez et al. (2009) recently reported a study of the mechano-chemical effects on the surface properties and molybdate exchange on hydrotalcite. These authors reported that milling of hydrotalcite leads to a sharp decrease in the specific surface area and a simultaneous decrease in the particle size and pore volume, which they attributed to compaction/shrinkage. The samples had been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive (EDX) and Fourier transform infrared (FTIR) spectroscopy. The ability of the samples to intercalate molybdate after calcinations at 500°C by the so-called reconstruction method was also tested.

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However, the...

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