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Multifunctional dual emissive fluorescent probe based on europium-doped carbon dots (Eu-TCA/NCDs) for highly selective detection of chloramphenicol, Hg2+ and Fe3+
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-07-01 , DOI: 10.1039/d2en00376g Farid Ahmed 1 , Shahzad Iqbal 1 , Hai Xiong 1
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-07-01 , DOI: 10.1039/d2en00376g Farid Ahmed 1 , Shahzad Iqbal 1 , Hai Xiong 1
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Lanthanide functionalized N-doped carbon dots have potential applications in the development of innovative photoluminescent probes for environmental and biological analytes. In this study, a novel multifunctional dual-emissive fluorescent probe based on a europium complex with 4,6′-dihydroxy-1,3,5′-triazine-2-carboxylic acid and N-doped carbon dots (Eu-TCA/NCDs) is reported for the selective detection of chloramphenicol (CAP), Hg2+ and Fe3+ in real samples. At an excitation wavelength λex = 275 nm, an aqueous solution of the Eu-TCA/NCD probe exhibited strong fluorescence emission at two different wavelengths (445 and 617 nm). Under the same conditions, the addition of CAP to the probe resulted in significant fluorescence quenching at both emission wavelengths. An excellent linear relationship (R2 = 0.9963) between the concentration of CAP (0.01–50 μM) and fluorescence quenching was observed with a detection limit of 12 nM. Furthermore, the probe demonstrated a ratiometric response in the presence of Hg2+ and Fe3+ ions. The addition of Hg2+ causes substantial quenching at 445 nm while the intensity at 617 nm almost remains unchanged. However, upon addition of Fe3+, the fluorescence intensity at 617 nm decreases sharply while the intensity at 445 nm remains the same. Furthermore, the practical applicability of the probe was authenticated by the detection of CAP, Hg2+ and Fe3+ in real samples (with RSD ≤ 2.35%) with a recovery percentage of 95.2–103. These results open a new avenue for developing lanthanide-doped nanocomposites that display white-light-based dual-emissive fluorescence recognition of biological and environmental pollutants.
中文翻译：
基于铕掺杂碳点 (Eu-TCA/NCDs) 的多功能双发射荧光探针，用于高选择性检测氯霉素、Hg2+ 和 Fe3+
镧系元素功能化的 N 掺杂碳点在开发用于环境和生物分析物的创新光致发光探针方面具有潜在应用。在这项研究中，基于铕配合物的新型多功能双发射荧光探针与 4,6'-二羟基-1,3,5'-三嗪-2-羧酸和 N 掺杂碳点 (Eu-TCA/NCDs ) 用于选择性检测实际样品中的氯霉素 (CAP)、Hg 2+和 Fe 3+。在激发波长λ ex= 275 nm，Eu-TCA/NCD 探针的水溶液在两种不同的波长（445 和 617 nm）下表现出强烈的荧光发射。在相同条件下，向探针中添加 CAP 会导致两个发射波长处的荧光显着猝灭。CAP 浓度 (0.01–50 μM) 与荧光猝灭之间存在极好的线性关系 ( R 2 = 0.9963)，检测限为 12 nM。此外，该探针在 Hg 2+和 Fe 3+离子的存在下表现出比例响应。Hg 2+的加入导致在 445 nm 处显着猝灭，而在 617 nm 处的强度几乎保持不变。然而，在添加 Fe 3+，617 nm 处的荧光强度急剧下降，而 445 nm 处的强度保持不变。此外，该探针的实际适用性通过在实际样品（RSD≤2.35%）中检测CAP、Hg 2+和Fe 3+来验证，回收率为95.2-103。这些结果为开发镧系元素掺杂纳米复合材料开辟了一条新途径，该复合材料显示基于白光的双发射荧光识别生物和环境污染物。
更新日期：2022-07-01
中文翻译：
基于铕掺杂碳点 (Eu-TCA/NCDs) 的多功能双发射荧光探针，用于高选择性检测氯霉素、Hg2+ 和 Fe3+
镧系元素功能化的 N 掺杂碳点在开发用于环境和生物分析物的创新光致发光探针方面具有潜在应用。在这项研究中，基于铕配合物的新型多功能双发射荧光探针与 4,6'-二羟基-1,3,5'-三嗪-2-羧酸和 N 掺杂碳点 (Eu-TCA/NCDs ) 用于选择性检测实际样品中的氯霉素 (CAP)、Hg 2+和 Fe 3+。在激发波长λ ex= 275 nm，Eu-TCA/NCD 探针的水溶液在两种不同的波长（445 和 617 nm）下表现出强烈的荧光发射。在相同条件下，向探针中添加 CAP 会导致两个发射波长处的荧光显着猝灭。CAP 浓度 (0.01–50 μM) 与荧光猝灭之间存在极好的线性关系 ( R 2 = 0.9963)，检测限为 12 nM。此外，该探针在 Hg 2+和 Fe 3+离子的存在下表现出比例响应。Hg 2+的加入导致在 445 nm 处显着猝灭，而在 617 nm 处的强度几乎保持不变。然而，在添加 Fe 3+，617 nm 处的荧光强度急剧下降，而 445 nm 处的强度保持不变。此外，该探针的实际适用性通过在实际样品（RSD≤2.35%）中检测CAP、Hg 2+和Fe 3+来验证，回收率为95.2-103。这些结果为开发镧系元素掺杂纳米复合材料开辟了一条新途径，该复合材料显示基于白光的双发射荧光识别生物和环境污染物。
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