Ding Rui, Chen Yanli, Li Yanhong, Zhu Yancheng, Song Cheng, Zhang Xiaomei
School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China.
Dongfang Middle School, Yanzhou District, Jining, Shandong 272100, China.
ACS Appl Mater Interfaces. 2022 Mar 9;14(9):11803-11812. doi: 10.1021/acsami.1c22514. Epub 2022 Feb 24.
With the continuous increase of electronic products, there is an urgent need to effectively recover gold from e-waste and other secondary resources other than the original mine. Here, hypercross-linking and polyamine-functionalized porous organic polymers (Pc-POSS-POP) were designed and facially synthesized based on multiple azo-coupling polymerizations between 2,9,16,23-tetraaminophthalocyanine (HPc(NH)) and octa(aminophenyl)-t8-silsesquioxane (OAPS) for the first time. The reaction requires no metal as a catalyst, thereby benefiting the purification of the product and the industrial scalability. Pc-POSS-POPs possess a hypercross-linking structure, highly conjugated frameworks, nitrogen-rich active sites, and extensively visible and near-infrared light absorption, which was utilized as an absorbent to retrieve Au (III). The results demonstrated that Pc-POSS-POPs have a high adsorption capacity (862.07 mg g) and a rapid adsorption rate toward gold recycling. The maximum adsorption capacity could reach up to 1026.87 mg g as in the case of light irradiation. Due to the strong N coordination sites and the electronic interaction between the -NH groups of Pc-POSS-POPs and AuCl, Pc-POSS-POPs also exhibited excellent selectivity toward gold over several coordinated metals [Cr (VI), Co (II), Cd (II), Ni (II), and Hg (II)]. These properties together with the good regenerative ability and superior recyclability demonstrated that Pc-POSS-POPs possess promising potential as hypercross-linking polymers for capturing and recycling of Au (III).
随着电子产品的不断增加，迫切需要从电子垃圾和除原生矿之外的其他二次资源中有效地回收金。在此，首次基于2,9,16,23-四氨基酞菁（HPc(NH)）和八（氨基苯基）-t8-倍半硅氧烷（OAPS）之间的多重偶氮偶合聚合反应，设计并简便合成了超交联且多胺功能化的多孔有机聚合物（Pc-POSS-POP）。该反应无需金属作为催化剂，从而有利于产物的纯化和工业规模放大。Pc-POSS-POP具有超交联结构、高度共轭骨架、富含氮的活性位点以及广泛的可见光和近红外光吸收特性，被用作吸附剂来回收Au(III)。结果表明，Pc-POSS-POP对金回收具有高吸附容量（862.07 mg g）和快速吸附速率。在光照情况下，最大吸附容量可达1026.87 mg g。由于Pc-POSS-POP的强N配位位点以及其-NH基团与AuCl之间的电子相互作用，Pc-POSS-POP对金相对于几种配位金属[Cr(VI)、Co(II)、Cd(II)、Ni(II)和Hg(II)]也表现出优异的选择性。这些特性连同良好的再生能力和卓越的可回收性表明，Pc-POSS-POP作为用于捕获和回收Au(III)的超交联聚合物具有广阔的应用潜力。
