Drinking water resources are scarce and are gradually depleting throughout the world. Water contamination by heavy metals is making the situation worse because it makes water unsuitable for potable use. Heavy metals are hazardous to any aquatic ecosystem, as these adversely influence the food chain and consequently human health. In the present study, Curcuma longa-mediated silver nanoparticles (T-AgNPs)-based sensors are reported to detect heavy metals by naked-eye and ultraviolet (UV)-based methods. A sharp UV peak at 400 nm (C-AgNPs) and a broader peak at 440 nm (T-AgNPs) were recorded. Scanning electron microscopy revealed the spherically shaped morphology of silver nanoparticles (AgNPs) with sizes of 30–50 nm (T-AgNPs) and 20–25 nm (C-AgNPs). The results of Fourier transform infrared spectroscopy indicated that compounds containing functional groups (–C–H, >C=C<, >C=O) played an important role in the reduction and capping of the AgNPs. C-AgNPs (K2) after interaction with manganese (Mn) (II) ions led to the prominent deepening of the yellowish color. In contrast, biological AgNPs (K4) led to the formation of a prominent complex. Green-synthesized AgNPs allowed single-step, cost-effective, colorimetric detection of manganese (II) and mercury (Hg) (I) in the aqueous solution.

中文翻译：

---

通过生物合成的银纳米粒子对汞和锰离子的生物传感器

饮用水资源稀缺，并且在世界范围内逐渐枯竭。重金属对水的污染使情况变得更糟，因为它使水不适合饮用。重金属对任何水生生态系统都是有害的，因为它们会对食物链产生不利影响，进而影响人类健康。在本研究中，姜黄据报道，基于介导的银纳米颗粒（T-AgNPs）的传感器可通过基于肉眼和紫外线（UV）的方法检测重金属。记录到在400 nm处有一个尖锐的UV峰（C-AgNPs），在440 nm处有一个较宽的峰（T-AgNPs）。扫描电子显微镜显示大小为30–50 nm（T-AgNPs）和20–25 nm（C-AgNPs）的银纳米颗粒（AgNPs）的球形形态。傅里叶变换红外光谱的结果表明，含有官能团（–C–H，> C = C <，> C = O）的化合物在减少和封端AgNPs中起着重要作用。与锰（Mn）（II）离子相互作用后，C-AgNPs（K2）导致浅黄色显着加深。相反，生物AgNPs（K4）导致形成突出的复合物。绿色合成的AgNP允许单步操作，具有成本效益，