Ficus religiosa bark extract was chosen as a reducing agent to fabricate biogenic silver nanoparticles (AgNPs), which were used to treat chromium in synthetic wastewater. The AgNPs formed were characterized using ultraviolet–visible absorption spectroscopy (UV–vis), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results of AgNPs characterization showed that the UV–vis spectrophotometer gave an absorbance peak for AgNPs synthesized from bark extract at 448 nm. The peaks in the XRD pattern of AgNPs synthesized from the bark extract of Ficus religiosa are associated with that of the face-centered-cubic form of metallic silver. The SEM analysis showed clear spherical morphology of AgNPs. These synthesized AgNPs were applied for the removal of chromium from synthetic wastewater. It was seen from the treatment results that above 74.8% removal efficiency was achieved.

中文翻译：

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从榕树皮提取物中制备生物银纳米粒子及其在铬去除中的应用

榕树皮提取物被选为还原剂来制造生物银纳米粒子 (AgNPs)，用于处理合成废水中的铬。使用紫外-可见吸收光谱 (UV-vis)、X 射线衍射 (XRD) 和扫描电子显微镜 (SEM) 对所形成的 AgNPs 进行了表征。AgNPs 表征的结果表明，UV-vis 分光光度计给出了从树皮提取物合成的 AgNPs 在 448 nm 处的吸收峰。从Ficus religiosa的树皮提取物合成的 AgNPs 的 XRD 图中的峰与金属银的面心立方形式有关。SEM 分析显示 AgNPs 具有清晰的球形形态。这些合成的 AgNPs 用于从合成废水中去除铬。从处理结果可以看出，达到了74.8%以上的去除效率。