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The present research provides data on the density (ρ), viscosity (η) and ability to absorb carbon dioxide of systems containing amine, molecular solvent (MS) and choline chloride (ChCl), with the investigation of the physical properties of both neat amine/MS/ChCl mixtures and their samples after complete CO2 saturation. The effect of the mixture composition was studied by varying amine from primary (monoethanolamine, MEA) to secondary (diethanolamine, DEA) and tertiary (triethanolamine, TEA) amine, and the degree of its substitution from a mono- (MEA, DEA and TEA) to a doubly-substituted (ethylenediamine, EDA) compound. The role of an MS was investigated via the exchange of ethylene glycol (EG) with water and dimethylsulfoxide (DMSO). In addition, the influence of the CO2 absorption promoters present in the ternary MEA/EG/ChCl mixture at an amount of 5 wt. % was also investigated. We show that an increase in ρ and η in the amine/EG/ChCl mixture affects the properties of neat amines. This suggests that in the studied ternary mixtures, the nature of the interspecies interactions is very similar to those in the previously studied MEA/EG/ChCl system. When EG was exchanged for H2O or DMSO, a decrease in ρ and an increase in η were observed. A comparison of the data with the corresponding properties of the systems composed of each pair of the mixture components indicates that the intensity and/or number of interspecies interactions in the present ternary mixtures were stronger than those in pure H2O, DMSO and MEA. While in the presence of promoters no significant changes in the studied properties were found, for the corresponding CO2-saturated samples, the ρ and η increased proportionally to the amount of absorbed gas. This was also the case for all the systems studied in the present research. The overall CO2 absorption of the EG-based mixtures decreased when going from primary to secondary and tertiary amines; it was 21% higher for the MEA/H2O/ChCl system compared to the mixtures containing EG and DMSO, which, in turn, showed similar absorption capacities. When the promoters were added to the MEA/EG/ChCl mixture, the highest capacity was found for the piperazine-containing system. [ABSTRACT FROM AUTHOR]

Bi-based perovskites (Bi 2 WO 6 , Bi 2 MoO 6 , BiFeO 3 , Bi 4 Ti 3 O 12 , etc.) have been documented as promising visible-light responsive materials for different photocatalytic applications (wastewater treatment, water splitting, CO 2 reduction, and oxidation of hydrocarbons and alcohols to produce valuable chemicals). However, the main disadvantage of pure perovskites is the rapid recombination of photoinduced charge carriers and, therefore, low activity. Among different methods developed, creating heterojunctions, especially Z-scheme and S-scheme, is considered as the most effective approach to improve the photocatalytic performances of materials due to increased light absorption, improved separation of electrons-hole pairs, combination of different favorable properties of each component of a hybrid, possibility to use a wide range of semiconductors to construct an ideal composite. This critical review reports progress over the last 5 years in creating Z-scheme and S-scheme composites based on Bi-containing perovskites in photocatalysis for environmental remediation, hydrogen evolution, reduction of CO 2 to CO and CH 4 , and production of industrially important organic chemicals by oxidation of hydrocarbons and alcohols. Moreover, challenges and opportunities are considered into developing new photocatalytic materials with their possible future commercialization. The critical review suggests strategies to improve the photocatalytic activity and stability of Z-scheme and S-scheme heterojunctions. [Display omitted] • Recent progress in application of Bi-based perovskite photocatalysts is overviewed. • Creating Z/S-scheme heterojunctions is effective approach for improving activity. • Bi-based perovskite heterojunctions are promising for environmental applications. • Industrial-scale prospects for Bi-based Z/S-scheme heterojunctions are explored. [ABSTRACT FROM AUTHOR]