期刊
CHEMICAL ENGINEERING JOURNAL
卷 449, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137758
关键词
Cationic; Bottom-up; Gold; Porous organic polymers; Adsorption
资金
- National Natural Science Foundation of China [21977064]
- Shandong Provincial Key Research and Develop-ment Program (Major Scientific and Technological Innovation Project) [2019JZZY010804]
- Science and Technology Development Project of Taian City, China [2019GX040]
- Academic Promotion Programme of Shandong First Medical University [2019QL008]
In this study, a novel porous organic polymer material, Imi-PPOPs-Br, was developed and showed excellent adsorption capacity, reusability, and selectivity for Au (III) in extracting gold from electronic waste. The adsorption mechanism was found to be due to the electrostatic interaction, strong binding of Au and N active sites, and reductive immobilization of Au (III) to Au (0). This study provides a new and facile strategy for constructing stable absorbents in environmental applications.
Developing ionic porous organic polymers (i-POPs) to retrieve gold from electronic waste is still in its infancy. Herein, for the first time, a cationic imidazolium and porphyrin cross-linked POPs, Imi-PPOPs-Br, was constructed by combining pyrrole and imidazolium-functionalized trialdehydes via the bottom-up method. As expected, the introduction of cationic imidazolium and porphyrin rings has endowed material high adsorption capacity (1543 mg/g), preferable reusability (more than eight times), and specific selectivity to Au (III). Multiple characterization results and density functional theory (DFT) calculations revealed that the adsorption mechanism of Au (III) by Imi-PPOPs-Br could be due to the electrostatic interaction between cationic Imi-PPOPs-Br and AuCl4- anions, strong bind of Au and N active sites, and reductive immobilization of Au (III) to Au (0). This study may put forward a new and facile strategy for constructing stable i-POPs that can be used as desirable absorbents in environmental fields.
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