Fast CO2 desorption of diamine-functionalized magnetic framework composites through magnetic induction swing adsorption

초록

Although magnetic induction swing adsorption enables rapid, energy-efficient heating and cooling cycles during adsorption and desorption, reducing both the desorption time and temperature is challenging. In this study, to reduce the energy and time required for CO2 regeneration in direct air capture (DAC), we developed diaminefunctionalized magnetic framework composites (Mg-MFC-30 and 50) by growing Mg2(dobpdc) (dobpdc4-= 4,4 '-dioxido-3,3 '-biphenyldicarboxylate) particles on the Fe3O4 surface. Functionalization of Mg-MFC-30 with N, N '-dimethylethylenediamine facilitated the attainment of an excellent CO2 adsorption capacity of up to 2.22 mmol g-1 at 400 ppm CO2 and complete CO2 desorption in just 3 min at 70 degrees C. This is a significant improvement over traditional temperature swing adsorptions, which require longer desorption times and higher regeneration temperatures. This advancement not only increases the feasibility of low-energy DAC but also sets a new benchmark for fast and efficient CO2 removal.

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