Enhanced-quantum yield sulfur/nitrogen co-doped fluorescent carbon nanodots produced from biomass Enteromorpha prolifera: synthesis, posttreatment, applications and mechanism study.
Enhanced-quantum yield sulfur/nitrogen co-doped fluorescent carbon nanodots produced from biomass Enteromorpha prolifera: synthesis, posttreatment, applications and mechanism study.
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DOI：
10.1038/s41598-017-04754-x
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发表时间：
2017-07-03
影响因子：
4.6
通讯作者：
Wang E
中科院分区：
文献类型：
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作者：
Xu Y;Li D;Liu M;Niu F;Liu J;Wang E
浒苔（Enteromorphaprolifera，E.增殖藻属（prolifera）是绿色潮的主要藻类之一，对近岸生态环境和海水水质有着重要影响。如何有效地利用这些废弃物作为可再生的原料资源，并具有可靠的应用机制，是亟待解决的环境问题。在此，E.采用一锅法绿色水热法将prolifera转化为具有吸引力的荧光碳纳米点（CND）。乙醇沉淀后处理可以提高CND的纯度和量子产率。纳米碳纳米管在水溶液中的分散性好，粒径分布窄，平均粒径为2.75 ± 0.12nm。CND的合成简单，量子产率较高，使E. prolifera便宜的好处，人类和自然，如在有效的细胞成像和纤维染色的应用。此外，发现CND的荧光强度可以被Fe 3+的加入选择性地猝灭，这可以用于特异性灵敏测定和去除水介质中的Fe 3+。更重要的是，这是合理地提出，猝灭是由于CND聚集和Fe 3 +-CND电荷转移跃迁的协同效应，由于Fe 3+和CND上的含氧基团之间的配位相互作用。
Enteromorpha prolifera (E. prolifera), one of the main algae genera for green tide, significantly influences both the coastal ecological environment and seawater quality. How to effectively utilize this waste as reproducible raw resource with credible application mechanism are urgent environmental issues to be solved. Herein, E. prolifera was converted to attractive fluorescent carbon nanodots (CNDs) by one-pot green hydrothermal process. The purity and quantum yields for the as-prepared CNDs can be enhanced upon the post-treatment of ethanol sedimentation. The CNDs can be well dispersed in aqueous medium with uniform spherical morphology, narrow size distribution and average size of 2.75 ± 0.12 nm. The ease synthesis and relatively high quantum yields of the CNDs make E. prolifera inexpensive benefit to the human and nature, such as applications in efficient cell imaging and fiber staining. Furthermore, it was discovered that the fluorescence intensity of the CNDs can be selectively quenched upon Fe3+ addition, which can be used for specific sensitive assay and removal of Fe3+ in aqueous medium. More importantly, it was reasonably proposed that the quenching was resulted from the synergistic effects of CNDs aggregation and Fe3+-CNDs charge-transfer transitions due to the coordination interactions between Fe3+ and the oxygenous groups on the CNDs.