Abstract Boron carbon oxynitride (BCNO) was successfully prepared via the template of the melamine sponge. The resultant BCNO was characterized by infrared spectroscopy, fluorescence spectrophotometer, scanning electron microscope as well as quantum yield (QY). The results revealed that BCNO exhibit yellow-green photoluminescence under UV illumination with QY of 86%. For BCNO phosphor, the fluorescence is disappeared in the water, which limits its application in aqueous media. BCNO/polyvinyl alcohol (PVA) composite films were synthesized from BCNO phosphors and PVA hydrogels by simple mixing and coating. BCNO/PVA composite film can be visually detected Cr6+ at a concentration of about 103 μM when using a portable UV lamp. This portable fluorescent composite film sensor has potential applications in Cr6+ sensing.

中文翻译：

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三聚氰胺海绵辅助合成具有黄绿色发光的多孔 BCNO 荧光粉用于 Cr6+ 检测

摘要 以三聚氰胺海绵为模板，成功制备了硼氧氮化碳（BCNO）。所得BCNO通过红外光谱、荧光分光光度计、扫描电子显微镜以及量子产率(QY)表征。结果表明，BCNO在紫外光照射下呈现黄绿色光致发光，QY为86%。对于BCNO荧光粉，荧光在水中消失，限制了其在水介质中的应用。BCNO/聚乙烯醇（PVA）复合薄膜是由BCNO荧光粉和PVA水凝胶通过简单混合和涂覆合成的。BCNO/PVA复合膜在使用便携式紫外灯时，可以肉眼检测到浓度约为103 μM的Cr6+。这种便携式荧光复合薄膜传感器在 Cr6+ 传感方面具有潜在应用。