| removal method | ionic liquid [Bmim] PF6 has good extraction ability for acid red 2BL and acid yellow RLN dyes, and the extraction effect of acid red 2BL was better than that of acid yellow RLN. The extraction rate decreased with the increase of dye concentration, and decreased with the increase of pH value. The increase of temperature was beneficial to the extraction. The UV spectra of acid red 2BL in ionic liquids showed obvious red shift. The use of Hydrophobic Ionic liquids to realize the recovery of dyes in printing and dyeing wastewater can effectively solve the environmental problems caused by the discharge. |