Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
Nuclear Materials Authority, El Maadi, Cairo, Egypt.
Waste Manag. 2020 Oct;116:166-178. doi: 10.1016/j.wasman.2020.07.030. Epub 2020 Aug 13.
Platinum group metals have gained significant interest due to their unique characteristics, which make them the main constituents in advanced applications. In this work, we introduce new pH-dependent optical mesocaptors for the colorimetric monitoring and separation of Au(III) from E-waste leach liquors without a preconcentration process. The mesoporous silica nanospheres are fabricated via simple, reproducible, and low-cost procedures. The optical mesocaptor is designed via indirect immobilization of thiazole yellow G (TYG) and amacid yellow M (AYM) chromogenic probes onto mesoporous nanostructured scaffolds. The silanol groups in the mesopores of silica surface robustly anchored dilauryl dimethyl ammonium bromide (DDAB) linker to induce the interactions with the TYG and AYM chelates, thereby leading to the fashioning of a stable optical mesocaptors without releasing of the chelates throughout adsorption and sensing assays. The finding provides evidence of the capability of the synthesized decorated new nanostructured sensor shows excellent sensitivity toward Au(III) with a limit of detection (LOD) as low as 1.16 µg L. Furthermore, the new sensors were able to selectively detect Au(III) in solution with multi ions components.
由于其独特的特性，铂族金属引起了人们的极大兴趣，使它们成为先进应用的主要成分。在这项工作中，我们引入了新的 pH 依赖性光学介孔体，用于比色监测和从无需预浓缩过程的电子废物浸出液中分离 Au(III)。介孔硅纳米球通过简单、可重复且低成本的程序制造。光学介孔体通过将噻唑黄 G（TYG）和酰胺黄 M（AYM）显色探针间接固定在介孔纳米结构支架上进行设计。硅烷醇基团在介孔二氧化硅表面上牢固地锚定了二月桂基二甲基溴化铵（DDAB）链接器，以诱导与 TYG 和 AYM 螯合物的相互作用，从而形成稳定的光学介孔体，在吸附和传感实验过程中不会释放螯合物。研究结果表明，所合成的新型纳米结构传感器具有出色的 Au(III)敏感性，检测限（LOD）低至 1.16µg L。此外，新型传感器能够在含有多种离子成分的溶液中选择性地检测 Au(III)。
