Removal of C.I. Basic Blue 3 dye by sorption onto cation exchange resin, functionalized and non-functionalized polymeric sorbents from aqueous solutions and wastewaters

The adsorption behavior of the cationic dye C.I. Basic Blue 3 (BB3) from aqueous solution on the cation exchanger Lewatit MonoPlus SP 112 (SP 112), functionalized Dowex Optipore SD 2 (SD 2) and non-functionalized Amberlite XAD 1180 (XAD 1180) polymeric sorbents was investigated in order to identify the ability of these materials to remove textile dye from wastewaters. For this purpose a series of batch tests were carried out as a function of contact time (1 min-96 h), dye concentration (100, 500, 1000 mg/L), auxiliaries presence (NaCl, Na2SO4, surfactants) and adsorption temperature (20–50 °C). The adsorption capacity (Q0) determined from the Langmuir isotherm model at 20 °C was found to be 560.7 mg/g for SP 112, 270.9 mg/g for SD 2 and 35.7 mg/g for XAD 1180. Q0 increased with the temperature rise for the cation exchanger and non-functionalized polymeric sorbent. The inverse effect of the temperature on BB3 sorption on SD 2 was observed. Kinetic studies of the dye followed the pseudo-second order model rather than the pseudo-first order or intraparticle diffusion model. Total decolorization of basic dyes wastewater by means of SP 112 occurred after 1 h. Dye desorption from the cation exchanger reached 100% in four cycles of sorption–desorption using 1 M HCl in 90% CH3OH. The working ion exchange capacities calculated from the breakthrough curves were equal to 205 mg/mL for SP 112, 3.5 mg/mL for SD 2 and 6.5 mg/mL for XAD 1180. These sorption properties of the polystyrene cation exchange resin Lewatit MonoPlus SP 112 recommend it as effective sorbent in the removal of organic ionic species like BB3 dye from aqueous solutions and industrial wastewaters.

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► Cation exchanger and polymeric sorbents for Basic Blue 3 dye removal.
► Lewatit MonoPlus SP 112 is the most effective.
► Kinetic data were well described by the pseudo-second order model.
► Good adsorption characteristics of cation exchanger for basic wastewaters.
► Desorption using 1 M HCl in 90% methanol was quantitative.