Abstract
We reported a simple route to prepare strong solid protonic acids (SPAs) from waste expanded polystyrene using a small amount of sulfuric acids while stirring at 130°C for 3h followed by heating at 220 or 260°C, respectively, for 2h. Such SPAs were amorphous carbon materials. It was found that they were efficient and recyclable catalysts for acid-catalyzed esterification reaction. Meanwhile, luminescent carbon dots were found on the surface of the obtained SPAs at 220°C. The photoluminescence emission peak position shifted from 415 to 542nm as the excitation wavelengths progressively increased from 310 to 470nm. The quantum yield was 13.2% at 310nm excitation wavelengths.
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