Etching Phosphate Glass-Ceramic with Phosphoric Acid to the Recyclable Synthesis of Porous Materials

ACS SUSTAINABLE CHEMISTRY & ENGINEERING(2023)

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Abstract
HCl, H2SO4, or HNO3 was traditionally used to selectively etch phosphate glass-ceramic to form porous skeleton materials. Herein, the feasibility of using H3PO4 to etch phosphate-based glass ceramics was confirmed. The innovative selection of H3PO4 as the etching medium made the waste solution generated during the etching process fully recyclable in the material reproduction. The composition, crystallization, microstructure, and performance of the glass synthesized with the collected waste etching solution as well as the resultant glass-ceramic and the final porous material were fully compared with those of the originally prepared one using pure H3PO4 reagent as the starting raw material. This study not only provides a protocol to eliminate the release of wastewater in the chemical etching route but also to save valuable resources for material synthesis. Moreover, the resynthesized porous material has a larger surface area and thus better adsorption and photocatalytic efficiencies than the originally synthesized one.
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Key words
material recycling, chemical etching, bifunctionalphosphoric acid, etchable phosphate glass-ceramic, porous material
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