Magnetic Induction Swing Adsorption: An Energy Efficient Route to Porous Adsorbent Regeneration

Abstract

Metal−organic frameworks (MOFs) are promising nanomaterials with unprecedented capacity to store small molecules. Despite this huge capacity, proposed methods for releasing these molecules are not yet feasible at a meaningful scale, largely because of the strong binding of the molecules and the thermally insulating nature of the adsorbent. It is likely that large amounts of energy would be required for operation at scale. Furthermore, the high adsorption capacity of MOFs is not typically matched by a high working capacity; adsorbed molecules are not readily retrieved. Here we show a series of magnetic framework composites (MFCs) synthesized from ferri-magnetic MgFe 2 O 4 nanoparticles and the Zr-based MOF UiO-66 can be deployed in a magnetic induction swing adsorption process for CO 2 capture and release. Exposure of the MFCs to an alternating current magnetic field resulted in the generation of heat by the embedded magnetic nanoparticle and fast release of CO 2 from the MOF, with an unprecedented 100% of adsorbed CO 2 released under a 42 mT field. This was achieved at a regeneration time of 240 s. The efficiency of the MISA process was shown to be dependent on the amount of MFC used, with efficiencies reaching 60% at just a gram scale. These local "nanoheaters" overcome the thermally insulating nature of the adsorbent, which has promising implications for use at scale. Additionally, the ability to access 100% of the adsorption capacity permits the use of strongly adsorbing, high-capacity MOFs that were previously discarded.

Performance evaluation of CuBTC composites for room temperature oxygen storage

“…59,66,69 Specic adsorption rate, SAR, is a parameter used in estimating the magnitude of the heating effect generated by magnetic nanoparticles when exposed to an alternating current magnetic eld. 11,59,66,69 The SAR is a valuable parameter that can be used to estimate the rate of conversion of the magnetic eld to thermal energy. A high SAR implies rapid heating, with SAR of the synthesized MgFe 2 O 4 nanoparticles calculated to be 130 W g À1 under an applied eld of 25 mT.…”

“…However, their strong host-guest interactions with the adsorbed molecules, particularly the strong adsorption at lower partial pressures and their thermally insulating nature, limit the uniform transfer of the applied heat throughout the MOF, making the regeneration process very challenging and energy-intensive. 11,[59][60][61][62][63] To address this, our group has demonstrated the potentials of incorporating stimuli-responsive materials in MOFs to achieve energyefficient release of the trapped gases. 11,39,59,60,[64][65][66][67][68] In this paper, we discuss how rapid and remote heat generation can be achieved through the fabrication of Magnetic Framework Composites (MFCs) and how their interactions with a magnetic eld can be used efficiently for release of the adsorbed molecules.…”

Fundamental studies of carbon capture using CaO-based materials

“…4,5 CO2 absorption using amine solution is commercially available. However, as noted by Haszeldine et al 6 and Sadiq et al, 7 an estimated 30% of power plant output is required for the regeneration of sorbents for carbon capture from post-combustion flue gas, because heating water in the amine sorbent causes large energy losses. On the other hand, using solid sorbents to capture CO2 is attractive, with the following advantages: (1) the lower heat capacity of solids significantly reduces the sensible energy required for sorbent regeneration; (2) corrosion problems caused by the use of amine solutions (the current standard carbon capture method) are avoided; 8 (3) heat released during the exothermic carbon capture reaction at a high operating temperature (comparable to gas turbine exhaust temperature) 9 can be extracted by steam for power generation enabling a highly efficient steam cycle.…”

Correction to: Magnetic-core@dual-functional-shell nanocomposites with peroxidase mimicking properties for use in colorimetric and electrochemical sensing of hydrogen peroxide

“…Due to abundant surface properties of magnetic materials, it is readily to introduce/modify other components onto the surface of magnetic core and form functional shell(s) [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. The exposed shell makes itself sensitive and reactive to the surroundings, thus realizes applications such as sensing [6,7,10,11,16], adsorption [12,13], catalysis [14,15], therapy [9], and so on. On the other hand, the shell cooperates with the magnetic core, even generates synergistic effect [9,12,13].…”

“…The exposed shell makes itself sensitive and reactive to the surroundings, thus realizes applications such as sensing [6,7,10,11,16], adsorption [12,13], catalysis [14,15], therapy [9], and so on. On the other hand, the shell cooperates with the magnetic core, even generates synergistic effect [9,12,13]. Currently, the construction of single (functional) layer of shell is well established [6][7][8][9][10].…”