Abstract
Porous materials with functional crystalline phases have potential applications in many fields. In this study, a titanium phosphate glass-ceramic precursor was respectively acid-leached by three different acid solutions (HCl, H2SO4, and H3PO4). After the acid leaching, porous glass-ceramics with photo-catalytically active phases were obtained. The time-dependent variations of composition, crystalline phase, morphology and the porous textures of the resultant samples prepared with different acid-leaching were fully analyzed. The results showed all three acids were applicable and effective for the acid-leaching process. The final products were porous skeletons composed of nanosheets. However, the leaching rate, the evolution of microstructure and the crystalline phases as well as the resultant photocatalytic performance of the samples were quite different. Based on the analysis and comparison of the leaching processes and the generated products, a unified three-stage mechanism for the formation of porous functional materials via the acid-leaching of a bulky glass-ceramic was proposed.
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