National Institute for Materials Science (NIMS), Sengen 1-2-1, Tsukuba, Ibaraki 305- 6 0047, Japan; Chemistry Department, Faculty of Science, Al-Azhar University, 71524 Assiut, Egypt.
National Institute for Materials Science (NIMS), Sengen 1-2-1, Tsukuba, Ibaraki 305- 6 0047, Japan; Petrochemical Department, Egyptian Petroleum Research Institute (EPRI), Nasr City, 11727 Cairo, Egypt.
J Colloid Interface Sci. 2021 Dec 15;604:61-79. doi: 10.1016/j.jcis.2021.07.002. Epub 2021 Jul 3.
This study aimed to develop a highly selective extraction protocol for gold (Au) ions from electronic urban waste (EUW) using simple, low-cost Inorganic-organic mesoporous hybrid segregators. The unique features of mesoporous hybrid segregator architectures are of particular to ensure effective adsorption system in terms of selective and sensitive recovery of Au ions from EUW. The segregator platform featured 3D micrometric, mesocage double-serrated plant-leaf-like γ-AlO sheets with hierarchy surfaces containing tri-modal mesopores interiorly and uniformly arranged toothed edges of ~20-40 and ~15 nm groove width and depth at the exterior surfaces, respectively. Rational incorporation of actively organic chelates into hierarchical γ-AlO sheet platforms leads to the production of a couple of selective segregators 1 and 2 (namely, SC1 and SC2) for Au ions at specific conditions by applying batch and fixed-bed columnar techniques. The mesocage SC segregators offer a selective extraction approach of Au ions from mixed element contents released from a computer motherboard (CMB). Our finding indicated that the textural and hierarchal features of the mesocage SC segregators played key roles in the selective adsorption/recovery of Au ions at pH 2-2.5 with high capacity (136-141 mg/g range) and effective reusability ≫10 consecutive cycles. In general, the developed SCs could be utilized as a real extractor of Au recovery from spent CMBs.
本研究旨在开发一种从电子城市废物（EUW）中高效选择性提取金（Au）离子的方法，使用简单、低成本的无机-有机介孔杂化分隔物。介孔杂化分隔物结构的独特特征尤其确保了有效的吸附体系，能够从 EUW 中选择性和灵敏地回收 Au 离子。分隔物平台具有 3D 微米级、介孔双层锯齿状植物叶状γ-AlO 片，其表面具有内部分布的三模态介孔和均匀排列的齿状边缘，外部表面的齿宽和齿深分别约为 20-40 和 15nm。在特定条件下，通过分批和固定床柱状技术，合理地将活性有机螯合物掺入分层γ-AlO 片平台中，可制备出两种对 Au 离子具有选择性的分隔物 1 和 2（即 SC1 和 SC2）。介孔笼 SC 分隔物提供了一种从计算机主板（CMB）释放的混合元素含量中选择性提取 Au 离子的方法。我们的研究结果表明，介孔笼 SC 分隔物的结构和层次特征在 pH 2-2.5 下对 Au 离子的选择性吸附/回收起着关键作用，具有高容量（136-141mg/g 范围）和有效可重复使用性（>10 次连续循环）。总的来说，所开发的 SC 可用于从废旧 CMB 中回收 Au 的实际提取剂。
