School of Chemistry Science and Engineering, Yunnan University, Cuihu North Road No. 2, Kunming 650091, China.
Molecules. 2019 Jul 31;24(15):2779. doi: 10.3390/molecules24152779.
A novel functional ion-exchange/adsorption metal organic resin (MOR), TEBAC-HKUST-1, was prepared and characterized. Ethanedithiol was used as the grafting agent to introduce thiol groups onto HKUST-1, and 4-vinylbenzyl chloride was then grafted onto SH-HKUST-1 using thiol groups. Finally, the quaternary ammonium functional group was immobilized onto the carrier by performing a quaternization reaction. The structure and property of TEBAC-HKUST-1 MOR were characterized by TGA, N adsorption-desorption, FTIR, SEM, and XRD. TEBAC-HKUST-1 MOR was used to remove metal cyanide complexes from wastewater. The adsorption was rapid, and the metal cyanide complexes including Pt(CN), Co(CN), Cu(CN), and Fe(CN) were removed in 30 min. TEBAC-HKUST-1 MOR exhibited a high stability in neutral and weak basic aqueous solutions. Furthermore, Pt(II) could be efficiently recovered through two-step elution. The recovery rate of Pt(II) for five cycles were over 92.0% in the mixture solution containing Pt(CN), Co(CN), Cu(CN), and Fe(CN). The kinetic data were best fitted with the pseudo second-order model. Moreover, the isothermal data were best fitted with the Langmuir model. The thermodynamic results show that the adsorption is a spontaneous and exothermic process. TEBAC-HKUST-1 MOR not only exhibited excellent ability for the rapid removal of metal cyanide complexes, but also provided a new idea for the extraction of noble metals from cyanide-contaminated water.
一种新型功能化离子交换/吸附金属有机树脂（MOR），TEBAC-HKUST-1，被制备并进行了表征。乙二硫醇被用作接枝剂，将巯基引入 HKUST-1 中，然后使用巯基将 4-乙烯基苄基氯接枝到 SH-HKUST-1 上。最后，通过季铵化反应将季铵官能团固定在载体上。通过 TGA、N 吸附-解吸、FTIR、SEM 和 XRD 对 TEBAC-HKUST-1 MOR 的结构和性能进行了表征。TEBAC-HKUST-1 MOR 被用于从废水中去除金属氰化物络合物。吸附速度很快，Pt(CN)、Co(CN)、Cu(CN)和 Fe(CN)等金属氰化物络合物在 30 分钟内被去除。TEBAC-HKUST-1 MOR 在中性和弱碱性水溶液中表现出很高的稳定性。此外，Pt(II)可以通过两步洗脱有效地回收。在含有 Pt(CN)、Co(CN)、Cu(CN)和 Fe(CN)的混合溶液中，Pt(II)的回收率在五个循环中超过 92.0%。动力学数据最好符合准二级模型。此外，等温数据最好符合 Langmuir 模型。热力学结果表明，吸附是一个自发和放热的过程。TEBAC-HKUST-1 MOR 不仅表现出快速去除金属氰化物络合物的优异能力，而且为从含氰化物废水中提取贵金属提供了新的思路。
