Abstract: Using diatomite as the main material, the diatomite-based porous ceramics were prepared by solid-phase sintering and low-temperature calcination process. The influence of tourmaline content on materials' microstructure, pore size distribution and the decolorization ability for malachite green aqueous solution was priority studid by scanning electron microscopy, Hg porosimetry,and so on. The results indicate that sample with 12; tourmaline has average aperture smallest 177.5 nm and biggest specific surface area 6.83 m2/g; Tourmaline content is enhanced from 0 to 16;, the materials' porosity decrease from 49.3; to 36.5; and materials' decolorization ability to malachite green solution's strengthens gradually. When tourmaline content is 16;, malachite-green aqueous solution is completely decolored in 6 h and the absorption peaks at 412 nm, 618 nm disappears.

Key words: Using diatomite as the main material, the diatomite-based porous ceramics were prepared by solid-phase sintering and low-temperature calcination process. The influence of tourmaline content on materials' microstructure, pore size distribution and the decolorization ability for malachite green aqueous solution was priority studid by scanning electron microscopy, Hg porosimetry,and so on. The results indicate that sample with 12; tourmaline has average aperture smallest 177.5 nm and biggest specific surface area 6.83 m2/g; Tourmaline content is enhanced from 0 to 16;, the materials' porosity decrease from 49.3; to 36.5; and materials' decolorization ability to malachite green solution's strengthens gradually. When tourmaline content is 16;, malachite-green aqueous solution is completely decolored in 6 h and the absorption peaks at 412 nm, 618 nm disappears.