Poormoghadam Parisa, Bahar Soleiman, Naghdi Yunes
Department of Chemistry, Faculty of Science, University of Kurdistan, P.O. Box 416, Sanandaj, Iran.
Mikrochim Acta. 2025 May 28;192(6):382. doi: 10.1007/s00604-025-07247-1.
A zirconium-based MOF (UiO-66-NH) with thiol groups attached to its magnetic corn surface was used for the adsorption and extraction of Au(III) from electronic waste. The composite was characterized using FTIR, XRD, FESEM, TGA, and BET techniques. The effects of the temperature, adsorption period, and pH on Au(III) adsorption were investigated. The optimal conditions to achieve the maximum adsorption of Au(III) on the adsorbent surface were pH 6.0, 50◦C, 40 min, and 10 mg of adsorbent. Moreover, oxidized magnetic corncobs functionalized with thiol (OCBs@FeO@UiO-66-SH) showed a notable ability to adsorb Au(III), with a capacity of 1587 mg/g. With the mass ratios of Au(III) to competing ions (Mg, Mn, Cu, Zn, Co, Cd, and Ni) fixed at 1:1 or extended to 1:5, this adsorbent prefers Au(III) ions while showing negligible adsorption to other ions. This study validated a technique to extract Au (III) from various electronic waste samples, achieving high recoveries (95.30% to 104.75%), demonstrating its effectiveness and lack of matrix interference. Examining various isotherm and kinetic models demonstrated that the Langmuir and pseudo-first-order models could effectively interpret the experimental and kinetic data. Thermodynamic calculations showed that the adsorption process is endothermic and occurs spontaneously. The optimal utilization of renewable waste as an adsorbent base, high adsorption capacity, recoverability, and reusability owing to its magnetic properties, high recovery rate of Au(III) from electronic matrices, and highly selective adsorption in the presence of competing ions are among the advantages of this adsorbent. Together, these features highlight the novelty of the present study.
一种在磁性玉米表面附着有硫醇基团的锆基金属有机框架材料（UiO-66-NH）被用于从电子废弃物中吸附和萃取金（III）。使用傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）、热重分析（TGA）和比表面积分析（BET）技术对该复合材料进行了表征。研究了温度、吸附时间和pH值对金（III）吸附的影响。实现金（III）在吸附剂表面最大吸附量的最佳条件为pH值6.0、50℃、40分钟以及10毫克吸附剂。此外，用硫醇官能化的氧化磁性玉米芯（OCBs@FeO@UiO-66-SH）表现出显著的吸附金（III）的能力，吸附容量为1587毫克/克。当金（III）与竞争离子（镁、锰、铜、锌、钴、镉和镍）的质量比固定为1:1或扩大到1:5时，这种吸附剂优先吸附金（III）离子，而对其他离子的吸附可忽略不计。本研究验证了一种从各种电子废弃物样品中萃取金（III）的技术，回收率很高（95.30%至104.75%），证明了其有效性且不存在基体干扰。对各种等温线和动力学模型的研究表明，朗缪尔模型和准一级动力学模型能够有效地解释实验数据和动力学数据。热力学计算表明，吸附过程是吸热的且自发进行。该吸附剂的优点包括将可再生废弃物作为吸附剂基质的最佳利用、由于其磁性而具有的高吸附容量、可回收性和可重复使用性、从电子基体中高回收率的金（III）以及在存在竞争离子时的高选择性吸附。这些特性共同凸显了本研究的新颖性。
