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Rational designed molecularly imprinted triazine-based porous aromatic frameworks for enhanced palladium capture via three synergistic mechanisms
Chemical Engineering Journal  (IF13.273),  Pub Date : 2021-10-14, DOI: 10.1016/j.cej.2021.132962
Juan Huang, Wei-Rong Cui, You-Gan Wang, Run-Han Yan, Wei Jiang, Li Zhang, Ru-Ping Liang, Jian-Ding Qiu

Herein, molecular imprinting technology (MIT) was introduced into construction of molecularly imprinted triazine-based porous aromatic frameworks (MI-TBPAFs) via Heck-coupling reaction for palladium extracting from wastewater. According to the decorating Pd-vinylpyridine complex (Pd@Vpy), MI-TBPAFs were given considerable tailor-made binding sites with strong affinities for palladium, which captured palladium from various metal ions precisely. The adsorption experiments showed that the extraction capacity of MI-TBPAF-3 was improved by 59.0% (435.4 mg/g) under simulated sunlight radiation. Mechanism analysis proved that Pd2+ was reduced into Pd0 by MI-TBPAF-3 via photocatalytic and chemical reduction effects originating from triazine base and pyridine nitrogen atoms in the extended π-conjugated framework respectively, thereby greatly increasing adsorption capacity by the sorption-reduction strategy. Organically combining the advantages of MIT, photocatalytic reduction and chemical reduction, three synergistic mechanisms, not only provides a new strategy for highly efficient palladium extraction, but also inspires new insights for precious metal recovery.