In the present paper, a systematic investigation of the influence of amine and salt concentration on the CO 2 absorption capacity (m CO 2 , moles of CO 2 absorbed by 1 kg of a solution) and amine efficiency (c CO 2 , moles of CO 2 absorbed by 1 mole of amine) of the ternary mixtures composed of monoethanolamine (MEA), ethylene glycol (EG), and choline chloride (ChCl) was carried out. We demonstrate that, in general, the presence of a fixed amount of ChCl in a mixed {MEA + EG} solvent cannot improve m CO 2 over an entire range of solvent composition and weakly decreases c CO 2 with the effect more pronounced for the mixtures containing greater amount of MEA. The influence of ChCl concentration on the above properties was analyzed for the mixtures with a fixed MEA/EG mole ratio but various ChCl concentrations. It was shown that a decrease in m CO 2 observed with an increase in ChCl, again, is rather caused by an overall decrease in MEA content in a mixture as its efficiency c CO 2 does not change when ChCl concentration increases. In addition, properties such as density (ρ) and viscosity (η) of the binary {MEA + EG} and ternary {MEA + EG + ChCl} mixtures were obtained within a wide range of temperatures for both neat and CO 2 -loaded samples. We show that regardless of the {MEA + EG} mixed solvent composition, the presence of ChCl increases both ρ and η. For CO 2loaded samples, both properties increase significantly with a greater contribution for the mixtures containing greater amount of MEA.
New unsymmetrically substituted phthalocyanine carboxylic acids were synthesized by mixed cyclotetramerization of substituted phthalonitriles. The UV-vis absorption and fluorescence spectra and quantum yields of fluorescence were studied in comparison to symmetrically substituted analogues. The distribution of phthalocyanine carboxylic acids on the surface of titanium dioxide was studied by UV-vis absorption spectroscopy.
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