School of Chemical Sciences, Central University of Gujarat, Gandhinagar, India.
Department of Chemistry, Malaviya National Institute of Technology, Jaipur, India.
Int J Phytoremediation. 2022;24(8):808-821. doi: 10.1080/15226514.2021.1977911. Epub 2021 Sep 24.
There is a significant interest to develop sensing devices that detect water toxins, especially heavy metal ions. Although there have already been numerical reports on detecting toxic heavy metal ions, the use of adaptable devices could enable a broader range of sensing applications. Here, we used fresh peel extract (PeA) and dried peel extract (DPeA) of (Avocado) as a reducing and capping agent to synthesize and stabilize AgNPs. The dimensions of NPs were controlled by tuning pH, temperature, and volume of the reducing agent. The sensitivity and selectivity of the AgNPs toward various metal ions viz. Ni(II), Cd(II), Al(III), Hg(II), Cr(III), Ba(II), Pb(II), Zn(II), Co(II), Mn(II), Cu(II), Ca(II), Mg(II), and K(I) were studied. The detection probe was found to be selective and sensitive toward Al(III) and Cr(III) ions with the detection limit of 0.04 ppm and 0.05 ppm, respectively. High-resolution transmission electron microscope (HRTEM), ultraviolet-visible (UV-Vis) spectroscopy, and dynamic light scattering (DLS) analysis results confirm an agglomeration-based mechanism for sensing both metal ions. This method can be exploited for the colorimetric detection of toxic heavy metals in real water samples.
人们对于开发能够检测水毒，尤其是重金属离子的感测设备有着浓厚的兴趣。尽管已经有关于检测有毒重金属离子的数值报告，但使用适应性强的设备可以实现更广泛的感测应用。在这里，我们使用鳄梨的新鲜果皮提取物（PeA）和干燥果皮提取物（DPeA）作为还原剂和封端剂来合成和稳定 AgNPs。通过调节 pH 值、温度和还原剂的体积来控制 NPs 的尺寸。研究了 AgNPs 对各种金属离子（如 Ni(II)、Cd(II)、Al(III)、Hg(II)、Cr(III)、Ba(II)、Pb(II)、Zn(II)、Co(II)、Mn(II)、Cu(II)、Ca(II)、Mg(II)和 K(I)）的灵敏度和选择性。检测探针对 Al(III)和 Cr(III)离子表现出选择性和灵敏度，检测限分别为 0.04 ppm 和 0.05 ppm。高分辨率透射电子显微镜（HRTEM）、紫外-可见（UV-Vis）光谱和动态光散射（DLS）分析结果证实了基于聚集的感测这两种金属离子的机制。该方法可用于实际水样中有毒重金属的比色检测。
