Division of Semiconductor and Chemical Engineering, Jeonbuk National University (Formerly Chonbuk National University), Jeonju, Jeonbuk, 54896, South Korea.
Department of Chemistry, Tri-Chandra Multiple Campus, Tribhuvan University, Kathmandu, Nepal.
Sci Rep. 2021 Sep 8;11(1):17836. doi: 10.1038/s41598-021-97228-0.
For the first time, a polyethyleneimine-impregnated alginate capsule (PEIIAC) with a high adsorption capacity is developed for the recovery of monovalent and trivalent gold from an acidic solution. The strategy results in a new type of adsorbent, polyethyleneimine impregnated alginate capsule (PEIIAC) with a core-shell structure having a large number of amine groups as cationic binding site, facilitating maximum uptake of anionic auric chloride. The maximum uptake of PEIIAC was 3078 and 929 mg/g for Au (III) and Au (I), respectively, are recordable compared to other reported adsorbents to date. The as-prepared material was executed to check the sorption efficacy for Au (III) and Au (I) in the pH range of 1-12. With an increment in pH, the uptake capacity for Au (III) increased, while the uptake capacity for Au (I) decreased. The FTIR, XRD, and XPS studies revealed that the gold adsorption mechanism includes ionic interactions and reduction, wherein the amine, hydroxyl, and carboxyl groups are involved. The capsule showed a higher adsorption efficiency than other reported sorbents, making the material applicable in acidic solutions for the recovery of Au (I) and Au (III).
首次开发了一种具有高吸附能力的聚乙烯亚胺浸渍海藻酸盐胶囊（PEIIAC），用于从酸性溶液中回收单价和三价金。该策略产生了一种新型吸附剂，即具有核壳结构的聚乙烯亚胺浸渍海藻酸盐胶囊（PEIIAC），其表面带有大量的胺基作为阳离子结合位点，有利于最大程度地吸附阴离子氯化金。与迄今为止报道的其他吸附剂相比，PEIIAC 对 Au (III) 和 Au (I) 的最大吸附量分别为 3078 和 929 mg/g，创下了记录。所制备的材料用于检查 Au (III) 和 Au (I) 在 pH 值为 1-12 的范围内的吸附效果。随着 pH 值的增加，Au (III) 的吸附容量增加，而 Au (I) 的吸附容量减少。FTIR、XRD 和 XPS 研究表明，金的吸附机制包括离子相互作用和还原，其中涉及胺、羟基和羧基。胶囊表现出比其他报道的吸附剂更高的吸附效率，使该材料适用于酸性溶液中回收 Au (I) 和 Au (III)。
