This paper presents the green synthesis of silver nanoparticles (AgNPs) using orange (Citrus sinensis) peel extract. The effects of different factors such as silver ion concentration, reaction time, temperature, pH, and extract quantity on the AgNPs synthesis were studied, enabling us to determine optimum synthesis conditions. We characterized the AgNPs with different techniques: UV–Visible Spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), FTIR, and XRD. The AgNPs showed yellowish brown to golden brown colors and a surface plasmon resonance (SPR) absorption band around a wavelength of 420 nm. FESEM images showed polydisperse AgNPs having an average size of about 55 nm. The XRD profile of the synthesized nanoparticles showed peaks that are characteristic of silver while the FTIR spectrum highlighted the functional groups associated with reducing silver ions and stabilizing the AgNPs. With the selected optimum conditions, the AgNPs were formed in less than 1 min. This is the fastest reaction time so far reported and is significantly shorter than in earlier reports. The AgNPs colloid solution was applied as nanosensor in the visual colorimetric detection of mercury(II) ions in water. The golden brown AgNPs colloid solution turned colorless and the characteristic SPR absorption band disappeared when mercury(II) ions were added to the solution. While the AgNPs show good sensitivity and selectivity for the colorimetric detection of mercury(II) ions with a detection limit of 1.24 × 10⁻⁶ mol/L (0.25 ppm), we also demonstrated the suitability of the method for detecting mercury(II) ions in drinking water.

本文介绍了使用橙色（柑桔（Citrus sinensis））绿色合成银纳米颗粒（AgNPs）的方法。）果皮提取物。研究了银离子浓度，反应时间，温度，pH和提取量等不同因素对AgNPs合成的影响，从而使我们能够确定最佳合成条件。我们用不同的技术对AgNP进行了表征：紫外可见光谱，场发射扫描电子显微镜（FESEM），FTIR和XRD。AgNPs显示出黄棕色至金棕色，并在420 nm波长附近存在表面等离振子共振（SPR）吸收带。FESEM图像显示平均大小约为55 nm的多分散AgNP。合成的纳米粒子的XRD谱图显示出具有银特征的峰，而FTIR光谱则突出了与还原银离子和稳定AgNPs有关的官能团。在选定的最佳条件下，在不到1分钟的时间内就形成了AgNP。这是迄今为止报道的最快的反应时间，比以前的报道要短得多。AgNPs胶体溶液被用作纳米传感器，用于视觉比色检测水中的汞（II）离子。当将汞（II）离子添加到溶液中时，金棕色的AgNPs胶体溶液变为无色，并且特征性SPR吸收带消失。AgNP对比色法检测汞（II）离子具有良好的灵敏度和选择性，检测限为1.24×10 当将汞（II）离子添加到溶液中时，金棕色的AgNPs胶体溶液变为无色，并且特征性SPR吸收带消失了。AgNP对比色法检测汞（II）离子具有良好的灵敏度和选择性，检测极限为1.24×10 当将汞（II）离子添加到溶液中时，金棕色的AgNPs胶体溶液变为无色，并且特征性SPR吸收带消失。AgNP对比色法检测汞（II）离子具有良好的灵敏度和选择性，检测限为1.24×10^-6  mol / L（0.25 ppm），我们还证明了该方法适用于检测饮用水中的汞（II）离子。