Method for decolorizing polyester fabric and polyester fabric

A method for decolorizing polyester fabric, comprising:

• providing a dye-attached polyester fabric;
• immersing the dye-attached polyester fabric in a first solution, obtaining a treated polyester fabric, wherein the first solution comprises water, a first swelling agent and a solubility promoter, wherein the first swelling agent is C1-C6 aliphatic carboxylic acid, C7-C13 aromatic carboxylic acid, alkali metal hydroxide, alkaline earth metal hydroxide, or a combination thereof, and the solubility promoter is R14NCl, peroxide, persulfate, cerium salt, chlorine-containing inorganic acid, chlorine-containing inorganic salt, or a combination thereof, wherein R1 is independently C1-C6 alkyl group, phenyl group, benzyl group, or phenethyl group, and
• immersing the treated polyester fabric in a second solution, obtaining a decolorized polyester fabric, wherein the second solution comprises water, a second swelling agent and an auxiliary swelling agent, wherein the second swelling agent is C3-C8 aliphatic alcohol, C4-C8 aliphatic ketone, C8-C16 aromatic ketone, C6-C10 phenolic compound, or a combination thereof, and the auxiliary swelling agent is ethylene carbonate, propylene carbonate, dimethyl acetamide, dimethyl formamide, dimethyl sulfoxide, ethyl acetate, tetrahydrofuran, dihydrolevoglucosenone, or a combination thereof.