The presence of industrial pollutants in water bodies, particularly metal anions and organic pollutants, has put human health and the environment at risk worldwide, triggering the research and development of multifunctional nanoparticles that not only have excellent luminescence detection ability but also possess simultaneous photo-degradation activity against harmful pollutants. Herein, we have synthesized Dy/Tb co-doped NaYF (Tb-NP) and (Tb-GO) NaYF:Dy/Tb@GO(GO=Graphene oxide) nano hybrids hydrothermal approach and tested their functional activity for the fluorescence selective detection of MnO anions and photocatalytic degradation of drug Chloramphenicol (CAP) in aqueous medium. The physicochemical characterization of prepared nanosamples was examined utilizing variety of analytical methods. The luminescent property of NaYF:Dy/Tb(7 %) revealed that it is exceptionally sensitive and selective towards the detection ofMnO anion in aqueous medium. It was observed that, when varied amount of MnO anion was added to a suspension solution containing the synthesized NaYF:Dy/Tb(7 %) chemosensor, the photoluminescence emission band at 545 nm was significantly quenched. Moreover, NaYF:Dy/Tb(Tb-NP) exhibited the limit of detection (LOD)value of 0.65 ppm along with high Stern-Volmer (K) quenching constant value of 4.75 ×10 M for MnO anion, indicating great selectivity and sensitivity of the designed nanosensors towards MnO anion. Further, the Graphene oxide (GO) conjoined NaYF:Dy/Tb(7 %) nanohybrid showed accelerating photocatalytic activity toward the degradation of CAP in aqueous medium under UV-irradiation. The obtained results of UV-Vis spectroscopy clearly indicate that NaYF:Dy/Tb@GO (Tb/GO) nanohybrid can act as a superior nanocatalyst than that of NaYF:Dy/Tb(Tb-NP) nanophosphors. The photocatalytic efficiency of NaYF:Dy/Tb@GO (Tb/GO) nanohybrid toward degradation of CAP is around 95.6 % within 50 minutes under UV light and it maintains remarkable stability even after five repeated catalytic cycles. In conclusion, this study presents a feasible method for immediate detection of MnO anion and improved photo-catalytic degradation of CAP in an aqueous medium employing NaYF:Dy/Tb(Tb-NP) and NaYF:Dy/Tb@GO (Tb/GO) as dual functional nanomaterials.

中文翻译：

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使用 Dy3+/Tb3+ 共掺杂 NaYF4 和氧化石墨烯杂化物的协同纳米材料系统，用于 MnO4- 阴离子的发光传感和增强水环境中抗生素氯霉素 (CAP) 的光催化去除


水体中工业污染物，特别是金属阴离子和有机污染物的存在，使全球范围内的人类健康和环境面临风险，引发了多功能纳米粒子的研究和开发，这些纳米粒子不仅具有优异的发光检测能力，而且还具有同步光降解能力针对有害污染物的活动。在此，我们合成了 Dy/Tb 共掺杂 NaYF (Tb-NP) 和 (Tb-GO) NaYF:Dy/Tb@GO(GO=氧化石墨烯)纳米杂化物水热方法，并测试了它们用于荧光选择性检测的功能活性MnO阴离子和药物氯霉素（CAP）在水介质中的光催化降解。利用各种分析方法对制备的纳米样品的物理化学特性进行了检查。 NaYF:Dy/Tb(7%) 的发光特性表明它对水介质中 MnO 阴离子的检测具有极高的灵敏度和选择性。观察到，当向含有合成的NaYF:Dy/Tb(7%)化学传感器的悬浮液中添加不同量的MnO阴离子时，545nm处的光致发光发射带显着猝灭。此外，NaYF:Dy/Tb(Tb-NP) 对 MnO 阴离子表现出 0.65ppm 的检测限 (LOD) 值以及 4.75 ×10 M 的高 Stern-Volmer (K) 猝灭常数值，显示出良好的选择性和灵敏度设计的针对MnO阴离子的纳米传感器。此外，氧化石墨烯（GO）与NaYF:Dy/Tb（7%）纳米杂化物在紫外线照射下表现出加速水介质中CAP降解的光催化活性。 紫外-可见光谱的结果清楚地表明NaYF:Dy/Tb@GO (Tb/GO)纳米杂化物可以作为比NaYF:Dy/Tb(Tb-NP)纳米磷光体更优异的纳米催化剂。 NaYF:Dy/Tb@GO (Tb/GO) 纳米杂化物在紫外光下 50 分钟内降解 CAP 的光催化效率约为 95.6%，即使在五次重复催化循环后仍保持显着的稳定性。总之，本研究提出了一种可行的方法，使用 NaYF:Dy/Tb(Tb-NP) 和 NaYF:Dy/Tb@GO (Tb/GO) 在水介质中立即检测 MnO 阴离子并改善 CAP 的光催化降解）作为双功能纳米材料。