Direct capture of low concentration CO2 using tetraethylenepentamine-grafted polyacrylonitrile hollow fibers

Review on Multidimensional Adsorbents for CO2 Capture from Ambient Air: Recent Advances and Future Perspectives

“…Polyacrylonitrile (PAN) has recently attained a degree attention to prepare hollow fibers, because it is a good candidate for the preparation of porous structure, and it is low-cost. Zhang et al 5 developed tetraethylenepentamine-grafted polyacrylonitrile (TEPA@ PAN) hollow fibers to absorb CO 2 directly from the atmosphere (25 • C, 470 ppm, RH 25%), and their CO 2 adsorption capacity reached up 2.03 mmol g −1 . Their CO 2 adsorption capacities at low concentrations (470−5000 ppm) were measured, indicating the values ranged from 1.70 to 3.66 mmol g −1 ; in addition, they allowed 20 adsorption/desorption cycles.…”

“…At present, direct air capture (DAC), as an emerging carbon-negative technology, which was first introduced in 1999, compensates for extracting CO 2 from nonpoint sources. In the past decades, DAC has been proven to be a promising method to capture CO 2 from ambient air − and indoor confined spaces …”

“…In this regard, this review classifies the major types of multidimensional adsorbents, including powders, fibers, , membranes, , and aerogels, and assesses their physicochemical properties, accompanied by their disadvantages and advantages for DAC technology. Combined with recent advances, the structure effects of emerging porous adsorbents on CO 2 uptake performance are further discussed and compared separately (Table ).…”

Dynamic study of direct CO2 capture from indoor air using poly(ethylenimine)-impregnated fiber sorbents

“…Sekizkardes et al 66 investigated fibers of polymers of intrinsic microporosity (PIM) based on amidoxime and amine functionalities for DAC, and achieved a 0.8 mmol CO 2 per g fiber uptake and a rapid CO 2 adsorption rate (5 minute adsorption cycle). Zhang et al 67 studied tetraethylenepentamine-grafted polyacrylonitrile (TEPA@PAN) hollow fibers and achieved a CO 2 capacity of 2.03 mmol g −1 at ambient CO 2 concentration. Despite these above studies, to date, there is a dearth of research data published on CO 2 adsorption kinetics using real ambient air in a system setup mimicking realistic industrial DAC, especially on fibrous materials.…”

Direct Air Capture of CO2 with Metal Nitrate-Doped, Tetraethylenepentamine-Functionalized SBA-15 Adsorbents

“…Similarly, He et al synthesized a mixed polyamine (40 wt % TEPA and 10 wt % DEA)-functionalized SBA-15 adsorbent, whose CO 2 capacity slightly decreased from 1.84 to 1.76 mmol CO 2 /g adsorbent in 10 cycles (adsorption at 25 °C in 400 ppm of CO 2 and desorption at 90 °C in pure N 2 ). Zhang et al fabricated a 35TEPA/PAN (polyacrylonitrile) adsorbent by grafting TEPA on a porous matrix of PAN hollow fibers, whose CO 2 capacity remained almost unchanged (2.03 → 1.95 mmol CO 2 /g adsorbent ) in 20 cycles [adsorption at 25 °C in 470 ppm of CO 2 and 25% relative humidity (RH); desorption at 80 °C in pure N 2 ]. Zhao et al prepared a defect-rich Mg 0.55 Al–O-supported TEPA (67 wt %) adsorbent, whose CO 2 capacity maintained around 90% of the initial capacity (1.31 mmol/g) after 80 cycles (adsorption at 25 °C in 400 ppm of CO 2 and desorption at 100 °C in pure N 2 ).…”