Superhigh and reversible NH3 uptake of cobaltous thiocyanate functionalized porous poly ionic liquids through competitive and cooperative interactions

Role of Structure in the Ammonia Uptake of Porous Polyionic Liquids

“…Combined with the UV–vis, FT-IR, and EPR spectroscopic results as well as the NH 3 coordinated mode with Co­(II), it is concluded that the NH 3 uptake of PVIm-Rn-Co is virtually through coordination of Co­(II) to Co­(NH 3 ) 6 2+ . , The sites of PILs for NH 3 uptake tested through temperature-programmed desorption (TPD) measurements in Figure b showed two peaks for the release of NH 3 . The first peak at about 60 °C belonged to the release of NH 3 with weak interactions such as hydrogen-bonding interactions, ,, while the chemical-interacted NH 3 was released before a temperature of 150 °C. The IR spectra of the recovered samples after the TPD test in Figure a is same as their fresh state, that the SCN – re-coordinates with Co­(II), which means the SCN – competes with NH 3 to coordinate with Co­(II) and promotes the excellent regeneration and recyclability performance of PVIm-Rn-Co.…”

“…NH 3 adsorption performance of PILs were measured by the weighing method as described in our previous work. 51 The effect of NH 3 partial pressure for adsorption was investigated by altering the composition of NH 3 and N 2 . The NH 3 desorption from the PILs was carried out under vacuum at 80 °C until the weight was maintained constant.…”

“…Staged gases Uptake of PVIm-R8-Co. The effect of the water present on NH 3 uptake of PVIm-R8-Co was tested in the apparatus as shown in our previous work, 51 30 sccm N 2 flow passed through 25 °C water (saturated vapor pressure is 3.169 kPa) and PVIm-R8-Co in turn, where the mixture gas passed through PVIm-R8-Co was moist N 2 steam containing 3.1% H 2 O. The weight increase of PVIm-R8-Co was considered as H 2 O adsorption.…”

“…49,50 Metallic PILs with high reversible and efficient NH 3 uptake through competitive and cooperative interactions were proposed in our previous work. 51 However, there are not many reports about the role of the structure in NH 3 uptake of PILs, which is the focus of this work, thanks to the structural designability of ILs. PILs with various structures were synthesized with various cross-linking agents (R), the metallic anion (M(II) (SCN) 4 2− , M = Co, Cu, Zn), and the cation moiety (imidazolium and pyridinium) as presented in Figure 1.…”

“…Deep eutectic solvents mixed with hydrogen-bond acceptors and various hydrogen-bond donors − have been proposed as very promising NH 3 absorbents through Lewis acid–base interaction and hydrogen-bonding interaction by taking advantage of the essence of ammonia as a Lewis base and a hydrogen acceptor . Polyionic liquids (PILs) combine the thermal stability of the polymer and the flexible structure of ILs, promoting PILs as adsorbents. , Designing PILs with outstanding capacity and high reversibility could be a potential challenge for the application of gas adsorption. , Metallic PILs with high reversible and efficient NH 3 uptake through competitive and cooperative interactions were proposed in our previous work . However, there are not many reports about the role of the structure in NH 3 uptake of PILs, which is the focus of this work, thanks to the structural designability of ILs.…”