CO₂separation using bipolar membrane electrodialysis

A Fine-Tuned Fluorinated MOF Addresses the Needs for Trace CO2 Removal and Air Capture Using Physisorption

“…Inopportunely, the worldwide energy needs have doubled the fossil fuel consumption in the last two decades, [1][2][3][4][5][6][7][8][9][10][11] as a result of the eminent economic growth and the enhanced quality of living in emerging countries, and thus provoking the manifest and amplified global carbon dioxide emission. The foreseen deployment of a relatively cleaner alternative energy sources, e.g.…”

“…Explicitly, point-source carbon capture and storage (CCS) can be regarded as a plausible solution sanctioning the sustainable use of fossil fuels in power, steel and cement production plants, while direct air capture (DAC) can address and remediate the CO 2 emissions from mobile-sources such as automobiles and airplanes. [1][2][3][4][5][6][7][8][9][10][11] Markedly, the DAC offers a great prospective to remotely capture the emitted CO 2 at a different distant location and time. It is to note that the CO 2 capture from air using the chemical adsorption technology has been deployed, for over seven decades, to maintain a safe level of CO 2 in confined spaces such as space shuttles and submarines, where access to fresh air is limited.…”

“…12,13 Nevertheless, the CO 2 concentrations and the associated CO 2 quantities to the DAC (400 ppm CO 2 , worldwide average of 54 kg/person/day) and to the point-source CCS (7-15% CO 2 , worldwide average of 38 kg/person/day) entail a relatively larger scale footprint and/or an excessive energy penalty than the requisites for the CO 2 capture in confined spaces (1-5 % CO 2 and 1 kg/person/day). [1][2][3][4][5][6][7][8][9][10][11] Perceptibly, the cost associated to the CO 2 capture in confined spaces is not a disturbing concern, as the compulsory objective is the effective removal of CO 2 and the subsequent procurement of the indispensable clean air. Noticeably, the low CO 2 concentration in air (400 ppm) and the compulsory low CO 2 level in confined spaces (< 0.5 %) position chemical adsorbents, such as aqueous alkylamine solutions and lithium hydroxide (LiOH) (80-120 kJ/mol), as the conventional benchmark materials, with a high CO 2 -selectivity even in the presence of water vapor, for the carbon capture in diluted CO 2 concentrations 8 Nevertheless, largescale widespread of the chemically driven separation approach is hampered by the prohibitive high-energy requirement for the CO 2 desorption/regeneration process.…”

CO2 extraction from seawater using bipolar membrane electrodialysis

“…1,2 In previous experiments, our lab investigated the use of bipolar membrane electrodialysis (BPMED) for CO 2 desorption from potassium carbonate and bicarbonate solutions at ambient pressure 3 and elevated pressures as high as 10 atm. 4 The electrodialytic desorption of CO 2 gas from aqueous solutions has the potential to improve the efficiency of CO 2 separation from a wide array of mixed gas sources, including power-plant flue-gas 5,6,7 and the atmosphere.…”

A Novel Strategy for Carbon Capture and Sequestration by rHLPD Processing

“…CCS involves the separation of CO2 from industrial and energy-related sources and the subsequent sequestration of concentrated CO2 into secure storage locations, such as onshore and offshore geological formations and ocean storage (Pachauri et al, 2007). Researchers have developed a wide variety of CCS techniques, such as amine scrubbing (Rao and Rubin, 2002;Metz et al, 2005b;Rochelle, 2009), solid adsorbents (Lee et al, 2006;Banerjee et al, 2008), membranes (Eisaman et al, 2010;Li et al, 2011), ionic liquid (Bara et al, 2010;Brennecke and Gurkan, 2010), and calcium looping cycle (MacKenzie et al, 2007;Brennecke and Gurkan, 2010). Among them, amine-based scrubbing is the most commercially available technology to capture CO2 from dilute atmospheric pressure gas (Metz et al, 2005b;Rochelle, 2009).…”