Novel CS2 storage materials from ion-like liquids for one-step synthesis of active nano-metal sulfides in the photocatalytic reduction of CO2

Abstract In the past two decades, a large number of organic sulfur compounds such as CS 2 have been released into the atmosphere, which has caused some impacts on the environment. At present, most of the industrial treatment methods of CS 2 have a series of problems, such as high energy consumption, the use of catalysts and additional treatment of by-products, which are not advisable from the economic point of view. Therefore, in this work, a method of efficient and rapid storage of CS 2 by EDAs + EGs ionic liquid systems at room temperature and pressure without catalyst were proposed. At the same time, the change trend of temperature and conductivity of EDAs + EGs systems during CS 2 storage were determined. Secondly, in order to realize the resource utilization of CS 2 SM, the mechanism of EDAs + EGs system storage CS 2 and the properties of CS 2 SM were further studied by NMR, FTIR, XPS, XRD and other modern spectral techniques. The results showed that white precipitate with high melting point (127–224 °C) and high thermal stability were formed after CS 2 is stored in the systems. These white precipitates had a similar chemical structure ([ + H 3 NR 1 NH 3 + − SC(=S)OR 2 (R 3 )O(S = )CS − ] n ), which were named as carbon disulfide storage material (CS 2 SM). Furthermore, CS 2 SMs were used as raw materials to one-step synthesize nano-metal sulfides (MSs) with excellent photocatalytic activity in the reduction of CO 2 . This provides a new method for the rapid storage and utilization of CS 2 , and it also has important practical significance for reducing CS 2 emissions and realizing effective utilization of CS 2 . This efficient, green and universally applicable CS 2 capture method is of great significance to reduce its hazards and obtain valuable chemicals.