Abstract：
In the course of this investigation, we undertook the contemplation of a green chemistry paradigm with the express intent of procuring valuable metal, namely gold, from electronic waste (e-waste). In pursuit of this overarching objective, we conceived a procedural framework consisting of two pivotal stages. As an initial stage, we introduced a physical separation procedure relying on the utilization of the Eddy current separator, prior to embarking on the process of leaching from e-waste. Subsequent to the partitioning of metals from the non-metal constituents of waste printed circuit boards (PCB), we initiated an investigation into the hydrogel derived from basil seeds (Ocimum basilicum L.), utilizing it as a biogenic sorbent medium. The thorough characterization of hydrogel extracted from basil seeds involved the application of an array of analytical techniques, encompassing FTIR, XRD, SEM, and BET. The batch sorption experiments show more than 90% uptake in the pH range of 2-5. The sorption capacity of the hydrogel material was evaluated as 188.44 mg g-1 from the Langmuir Isotherm model. The potential interference stemming from a spectrum of other ions, encompassing Al, Cu, Ni, Zn, Co, Cr, Fe, Mn, and Pb was systematically examined. Notably, the sole instance of interference in the context of adsorption of gold ions was observed to be associated with the presence of lead. The application of the hydrogel demonstrated a commendable efficiency in the recovery of Au(III) from the leached solution derived from the waste PCB.
摘要：
在调查的过程中,我们进行了绿色化学范式的思考，其明确意图是采购有价值的金属，即黄金,从电子废物（电子废物）。为了实现这一总体目标，我们构想了一个由两个关键阶段组成的程序框架。作为初始阶段,我们介绍了一种依靠涡流分离器的物理分离程序，在开始从电子垃圾中浸出的过程之前。在从废弃印刷电路板（PCB）的非金属成分中分离金属之后，我们开始研究源自罗勒种子的水凝胶（OcullbasilicumL.），利用它作为生物吸附剂介质。从罗勒种子中提取的水凝胶的彻底表征涉及一系列分析技术的应用，包括FTIR，XRD,SEM,和下注。分批吸附实验显示在2-5的pH范围内吸收超过90%。水凝胶材料的吸附能力从Langmuir等温线模型评估为188.44mgg-1。来自其他离子光谱的潜在干扰，包括Al,Cu,Ni,Zn,Co,Cr,Fe,Mn,并对Pb进行了系统检查。值得注意的是,在金离子吸附的情况下，唯一的干扰实例与铅的存在有关。水凝胶的应用证明了从源自废弃PCB的浸出溶液中回收Au（III）的良好效率。
