Ionic liquids (ILS) are typically referred to as “green” or “designer” solvents. These solvents consist entirely
of ionic species exhibiting many fascinating properties, such as non-flammability, low vapour pressure, wide
electrochemical window and thermodynamic kinetic stability. Moreover, these remarkable properties can also be
adjusted by using various synthesis methods. The application of ILs solves many major problems in green energy
production and environment including solar energy, biomass and CO2 adsorption. Although, given our current state
of knowledge, the applications of ILs are unpredictable; they have nonetheless rapidly attracted enormous attention in the fields of modern
physical chemistry, materials science, applied technologies and engineering. This review focuses on the basic ILs synthesis methods
and the latest advancements in the clean energy and environmental application of ILs.