煤基碳量子点的制备及其在离子检测中的应用
Coal Conversion（2019）
Abstract
以长焰煤为碳源,使用空气氧化预处理与双氧水氧化结合的“分步法”成功制备出了煤基碳量子点(carbon quantum dot,CQD).对碳量子点的表面形貌、化学组成和光学性质进行表征,并考察了碳量子点作为纳米荧光探针检测金属离子的性能.结果 表明:煤基碳量子点平均粒径为13.1 nm,含氧量达30.56％,在波长为365 nm的紫外光照射下呈现出明亮的青蓝色荧光,其荧光强度在中性条件下最大,并可在较宽的pH范围内保持荧光稳定性;与Fe3+能发生特异性荧光淬灭,在0 μmol/L～9 μmol/L Fe3+浓度范围内,荧光猝灭程度与Fe3+浓度呈良好的线性关系.
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