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首页> 外文期刊>RSC Advances >Carbon quantum dots derived from the extracellular polymeric substance of anaerobic ammonium oxidation granular sludge for detection of trace Mn(vii) and Cr(vi)
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Carbon quantum dots derived from the extracellular polymeric substance of anaerobic ammonium oxidation granular sludge for detection of trace Mn(vii) and Cr(vi)

机译：衍生自厌氧氧化颗粒污泥的细胞外聚合物的碳量子点，用于检测痕量Mn（VII）和Cr（VI）

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摘要

Carbon quantum dots (CQDs) were synthesized via a hydrothermal method, in which extracellular polymeric substance (EPS) from anaerobic ammonium oxidation (anammox) granular sludge was used as a carbon precursor, while citric acid and ethylenediamine were applied as auxiliary carbon source and passivation agent, respectively. The synthesized CQDs, with orderly spherical shape and mean size of 7.15 nm, emitted blue fluorescent light under UV radiation of 365 nm. The CQDs had a high fluorescence yield (40.84%), with good water solubility and excellent spectroscopic properties. In addition, the CQDs exhibited selective, sensitive and distinctive fluorescence quenching behaviors for Cr( VI ) and Mn( VII ) in a PBS buffer solution (NaH _(2) PO _(4) –Na _(2) HPO _(4) ) of pH 7, with a detection limit of 5.8 nM for Cr( VI ) and 2.3 nM for Mn( VII ). Owing to the nitrogen components from the EPS of anammox granules, the CQDs were well nitrogen-doped, promoting electron-transfer and leading to reduction between the CQDs and Mn( VII )/Cr( VI ). These results indicate that CQD-based chemical sensing is a simple and efficient means for the fluorescence detection of Mn( VII ) and Cr( VI ).
机译：通过水热法合成碳量子点（CQDS），其中使用来自厌氧氧化氧化（厌氧）颗粒污泥的细胞外聚合物物质（EPS）用作碳前体，而柠檬酸和乙二胺被用作辅助碳源和钝化分别是代理人。合成的CQDS，具有有序球形形状和平均尺寸为7.15nm，紫外线辐射的蓝荧光365nm。 CQD具有高荧光产率（40.84％），具有良好的水溶性和优异的光谱性能。此外，CQD在PBS缓冲溶液中表现出Cr（VI）和Mn（VII）的选择性，敏感和独特的荧光猝灭行为（NaH _（2）PO _（4）-NA _（2）HPO _（4 ））pH 7，对于Mn（VII）的Cr（VI）和2.3nm的检出限为5.8nm。由于来自厌氧颗粒的EPS的氮成分，CQDS良好的氮掺杂，促进电子转移并导致CQDS和Mn（VII）/ Cr（VI）之间的降低。这些结果表明，基于CQD的化学感测是Mn（VII）和Cr（VI）的荧光检测的简单有效的方法。

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