Meso-macroporous polymer densely functionalized with tertiary amine groups as effective sorbents for SO2 capture

Solvent-free molten co-assembly of ordered mesoporous carbon for efficiently supported adsorption and separation of SO2

“…These SO 2 /CO 2 and SO 2 /N 2 IAST selectivities of OMC@mPEI- x are the record values to date (Table S2†), which should originate from the unique SO 2 recognized effect of mPEI additive, but rather weak binding affinities for CO 2 and N 2 . 15,21 Notably, OMC@mPEI-2 and OMC@mPEI-2.5 showed the highest IAST selectivity for SO 2 /CO 2 and SO 2 /N 2 among the OMC@mPEI- x , respectively, because of their suitable content of mPEI additive, which showed the combined high exposure degree and improved accessibility to SO 2 molecules. On the other hand, the SO 2 /CO 2 and SO 2 /N 2 IAST selectivities on OMC@mPEI- x can be slightly enhanced with increasing adsorption temperature (Fig.…”

“…In comparison with the mentioned liquid absorbents, porous solid adsorbents such as zeolites, 16,17 porous carbons, 18,19 metal–organic frameworks (MOFs), 4,20 and porous organic polymers exhibit advantages of low energy operation, 21 relative ease of implementation and superior recyclability. Nevertheless, the SO 2 selectivities and capacities of porous solid adsorbents can still not meet the practical requirements due to their rather limited density of active sites and weak interaction with SO 2 .…”

“…The most promising way should be the encapsulation of highly efficient liquid absorbents such as mPEI into porous solid supports. 14,21,26 In this regard, the porous supports are hoped to possess the ideal structural features such as large BET surface area, abundant and uniform mesoporosity, and inert frameworks. 24,27,28 A large BET surface area can encapsulate an enhanced amount of mPEI, thus providing a high density of adsorptive active sites; abundant and ordered mesoporosity is favorable for the homogeneous dispersion of mPEI large molecules and improving their accessibility; 29–31 the inert carbon frameworks can minimize interference for the immobilized mPEI so as to keep its intrinsically superior recognition for SO 2 , thus keeping its good selectivity and reversibility in SO 2 selective capture.…”

A Mini-Review on NH3 Separation Technologies: Recent Advances and Future Directions

“…It will be very fascinating if the porous materials can be synthesized from cheap reactants through simple yet green routes. There have been many interesting works demonstrating the cost-effective and facile synthesis of porous materials with large pore size and high pore volume. − Such porous materials may provide new guidance for designing composite adsorbents with potential application in NH 3 separation.…”

Investigation of Amine-Based Ternary Deep Eutectic Solvents for Efficient, Rapid, and Reversible SO2 Absorption

“…Millions of tons of sulfur dioxide (SO 2 ), mainly originating from the combustion of fossil fuels, are emitted per year. − The excessive emission of SO 2 could induce a series of environmental issues and would be harmful to people’s health. − Thus, the effective capture of SO 2 has received constant attention in recent decades . Traditionally, flue gas desulfurization methods are considered as the most reliable strategy, including the lime–limestone scrubbing method and ammonia scrubbing method. − However, tons of low-grade gypsum wastewater would be produced simultaneously with these methods, causing secondary pollution and further treatment .…”