Alkyl‐Linked Porphyrin Porous Polymers for Gas Capture and Precious Metal Adsorption

Abstract

In gas adsorption and metal recovery, inexpensive and covalently bonded porous polymers offer industrial feasibility, despite the challenge of having reactive functionalities while maintaining porosity. Herein, three highly porous covalent organic polymers (COPs), COP‐210, COP‐211, and COP‐212, with porphyrin functionalities that are readily synthesized by a Friedel–Crafts reaction using chlorinated solvents as linkers are reported. The polymers exhibit competitive adsorption capacities for CO2, H2, and CH4. Their porphyrin sites proved particularly effective in precious metal recovery, where COPs exhibit high selectivity toward gold, platinum, palladium, and silver. Analysis reveals that reductive metal capture is prevalent for gold and silver. Platinum is also captured through a combination of reduction and chelation. The gold adsorption capacities are 0.901–1.250 g g−1 with fast adsorption kinetics at low pH. COP‐212 selectively recovers 95.6% of gold from actual electronic waste (e‐waste) collected from junkyards. The results show that the inexpensive and scalable porous porphyrin polymers offer great potential in gas capture, separation, and precious metal recovery.

Salt-Templated Solvothermal Synthesis of Dioxane-Linked Three-Dimensional Nanoporous Organic Polymers for Carbon Dioxide and Iodine Capture

“…3−7 Moreover, POPs have also found applications in atmospheric water capture, 8 semiconducting materials, 9 heterogeneous catalysis, 10 precious metal recovery, water purification, iodine (I 2 ) capture, and many others. 11,12 The structural tunability of POPs allows one to control the nature of chemical functionalities by choosing suitable precursors. 13−15 The porosity and pore size of POPs, on the other hand, are determined by the length, dimensions, and rigidity of the building block as well as the degree of interpenetration of the polymer backbone.…”

“…Therefore, the development of efficient sorbents for CO 2 capture is not only vital for environmental protection but also important for the development of a CO 2 circular economy, which involves the further utilization of captured CO 2 as a sustainable chemical commodity . In this direction, porous organic polymers (POPs) have been considered as promising alternatives for CO 2 capture and separation because of their structural tunability, high porosity, and chemical stability. − Moreover, POPs have also found applications in atmospheric water capture, semiconducting materials, heterogeneous catalysis, precious metal recovery, water purification, iodine (I 2 ) capture, and many others. , The structural tunability of POPs allows one to control the nature of chemical functionalities by choosing suitable precursors. − The porosity and pore size of POPs, on the other hand, are determined by the length, dimensions, and rigidity of the building block as well as the degree of interpenetration of the polymer backbone . Hence, the ability to control the porosity, especially in three-dimensional (3D) POPs, is essential for the design of new polymers with the desired porosity for target applications.…”

Systematic Modulation of Thiol Functionalities in Inexpensive Porous Polymers for Effective Mercury Removal

“…An apparent weight gain for COP-130 was observed at 375 °C (Figure S11a); this was attributed to the oxidation of a small amount of residual AlCl 3 . [46] The char fraction values for COP-130, COP-130-Cl, COP-130-SH, COP-130-SSH, and COP-130-SSSH at 900 °C examined under nitrogen were 79.2, 58.8, 60.1, 57.2, and 49.2, respectively.…”

“…In addition, COP-130-Cl displayed a distinct peak at 666 cm À 1 that was ascribed to CÀ Cl stretching (Figure 2c). [44,46] The elemental compositions were also measured through C, H, N, and S elemental analyses. The sulfur content of COP-130-SH, COP-130-SSH, and COP-130-SSSH was 11.68, 18.84, and 22.90 %, respectively (Table S1).…”

Multilevel Hollow Phenolic Resin Nanoreactors with Precise Metal Nanoparticles Spatial Location toward Promising Heterogeneous Hydrogenations

“…All the AuPd bimetallic samples showed the same spectra with two peaks at around 84 and 88 eV, which were assigned to Au 4f 7/2 and Au 4f 5/2 electrons of Au metal, respectively. [54,55] The Au 4f 7/2 spectra of AuPd bimetallic samples showcased the shift of binding energy toward higher values with the addition of more Au. Both the increased percentage of Pd 0 and the positive shifts for Au 4f could be attributed to the electron transfer between Pd and Au.…”