Synthesis and arsenic adsorption capability of smectite-titanium oxide nanocomposite of tunable pore size.

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A clay-titanium oxide nanocomposite was synthesized from smectite powder and titanium oxide powder by dispersing them in water followed by centrifuge sedimentation. Heated products were obtained by treating the mixed gel hydrothermally in an autoclave. The XRD patterns of the unheated and heated products showed basal plane reflections in the range of 8.5-9.4 nm suggesting formation of composites having monolayers of the titanium oxide particles between smectite layers. Their layer spacing and pore size got enlarged after the hydrothermal treatment suggesting a crystal growth of the titanium oxide particles. The composite well adsorbed As (III) and As (V) dissolved in water. An application of this composite as an additive for buffer layers in waste landfill sites was examined.
日本粘土学会の論文