Highly Efficient and Selective Gold Recovery Based on Hypercross-Linking and Polyamine-Functionalized Porous Organic Polymers

Rui Ding; Yanli Chen; Yanhong Li; Yancheng Zhu; Cheng Song; Xiaomei Zhang

doi:10.1021/acsami.1c22514

Highly Efficient and Selective Gold Recovery Based on Hypercross-Linking and Polyamine-Functionalized Porous Organic Polymers

ACS Appl Mater Interfaces. 2022 Mar 9;14(9):11803-11812. doi: 10.1021/acsami.1c22514. Epub 2022 Feb 24.

Authors

Rui Ding¹, Yanli Chen², Yanhong Li¹, Yancheng Zhu¹, Cheng Song³, Xiaomei Zhang¹

Affiliations

¹ School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China.
² Dongfang Middle School, Yanzhou District, Jining, Shandong 272100, China.
³ Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China.

PMID: 35201753
DOI: 10.1021/acsami.1c22514

Abstract

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 (H₂Pc(NH₂)₄) 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^-1) and a rapid adsorption rate toward gold recycling. The maximum adsorption capacity could reach up to 1026.87 mg g^-1 as in the case of light irradiation. Due to the strong N coordination sites and the electronic interaction between the -NH₄⁺ groups of Pc-POSS-POPs and AuCl₄^-, 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).

Keywords: adsorption; gold; hypercross-linking; phthalocyanine; porous organic polymers; silsesquioxane.