An ionic liquid functionalized reduced graphite oxide (IL-RGO)/TiO.sub.2 nanocomposite was synthesized and used to reduce CO.sub.2 to a hydrocarbon in the presence of H.sub.2O vapor.

A method for recycling polyester fabrics with use of an ionic liquid catalyst is provided, which includes: providing a recycled polyester fabric; and using a chemical de-polymerization liquid to chemically de-polymerize the recycled polyester fabric and form a de-polymerization product that includes bis-2-hydroxylethyl terephthalate (BHET). The chemical de-polymerization liquid is used to chemically de-polymerize the recycled polyester fabric in an environment where a de-polymerization catalyst exists, and the de-polymerization catalyst is the ionic liquid catalyst in a solid state.