Magnetically-separable hierarchically porous carbon monoliths with partially graphitized structures as excellent adsorbents for dyes

Abstract

Magnetically-separable hierarchically porous carbon monoliths with partially graphitized structures were synthesized through confinement self-assembly in polyurethane (PU) foam associated with a direct carbonization process from triblock copolymer F127, phenolic resol and ferric nitrate. It was observed that the magnetic Fe nanoparticles were embedded in the walls of graphitic porous carbon matrix, and the resulting materials exhibited hierarchically porous structure with macropores of 100-450 lm, mesopore size of 4.8 nm, BET surface area of 723 m 2 /g, pore volume of 0.46 cm 3 /g, and saturation magnetization of 3.1 emu/g. Using methylene blue as model dye pollutant in water, the carbon monolith materials showed high adsorption capacity of 190 mg/g, exhibiting excellent adsorption characteristics desirable for the application in adsorption of dyes and easy separation under an external magnetic field.

Applications of hierarchically structured porous materials from energy storage and conversion, catalysis, photocatalysis, adsorption, separation, and sensing to biomedicine

“…In this context, recently effort has been made to fabricate magnetic materials or magnetically-separable monoliths with hierarchically porous structures as industrial adsorbents. [377][378][379][380][381] For example, a series of hierarchically porous iron oxides including a-Fe 2 O 3 , Fe 3 O 4 and g-Fe 2 O 3 with different hollow 379 and bowknot-like structures have been fabricated by a precursor thermal conversion method. 378 These porous iron oxide superstructures exhibit ferromagnetic properties at room temperature and selective adsorption ability for different dye molecules.…”

“…378 Moreover, very recently, Liu et al have synthesized magneticallyseparable hierarchically porous graphitic carbon monoliths containing magnetic nanoparticles as magnetically separable adsorbents for dyes. 380,381 These monoliths are fabricated via multi-component co-assembly in a polyurethane (PU) foam scaffold and possess a hierarchically macro-mesoporous structure with a high specific surface area (725 m 2 g À1 ), large pore size (7.2 nm) and pore volume (0.74 cm 3 g À1 ), and high saturation magnetization (2.3 emu g À1 ), which make them ideal candidates for the adsorption of dyes in aqueous solution (Fig. 57).…”

Designed Fabrication of Polymer-Mediated MOF-Derived Magnetic Hollow Carbon Nanocages for Specific Isolation of Bovine Hemoglobin

“…Much recent effort has been put in preparing magnetic particles 24 or magnetic-separable monoliths 25,26 with interconnected hierarchical pores via different methods, including the precursor thermal conversion method, 27 the hard template etching process, 28 and the coassembly approach. 25,26 Nevertheless, most of the previous synthetic approaches are timeconsuming and tedious, and there are still few reports about hierarchically porous materials applied in separation and life science fields.…”

“…By introducing the magnetic particles into hierarchically porous materials, the ultrahigh-speed centrifugation can be replaced by the magnetic separation, resulting in a rapid separation process and less nonspecific adsorptions under the external magnetic field. Much recent effort has been put in preparing magnetic particles or magnetic-separable monoliths , with interconnected hierarchical pores via different methods, including the precursor thermal conversion method, the hard template etching process, and the coassembly approach. , Nevertheless, most of the previous synthetic approaches are time-consuming and tedious, and there are still few reports about hierarchically porous materials applied in separation and life science fields.…”

A cobalt–pyrrole coordination compound as high performance cathode catalyst for direct borohydride fuel cells

“…10,11 Given this, porous non-Pt catalysts are considered as highly promising alternatives to Pt due to their cost effectiveness and high surface area, which is capable of loading more catalytic sites to compensate the inferiority in intrinsic catalytic activity. [12][13][14] Among the various candidates, M-N/MPC (M ¼ transition metal, N ¼ nitrogenous compound, MPC ¼ microporous carbon) catalysts show a particular potential as highperformance ORR catalysts to replace Pt. [15][16][17] MPC has higher specic surface area and can support more active centers than the common carbon materials.…”