The batch and modeling investigation of Sr(II) adsorption on carbon nanofibers

Effect of water chemistry on Sr(II) adsorption onto carbon nanofibers (CNFs) was investigated by batch and modeling techniques. The characterization results showed that CNFs comprised a variety of functional groups such as -OH and -COOH groups. No effect of ionic strength indicated that Sr(II) adsorption onto CNFs was the inner-sphere surface complexation. The maximum adsorption capacity of CNFs was 58.72 mg/g at pH 4.5 and 293 K. The thermodynamic parameters suggested that Sr(II) adsorption was an endothermic and spontaneous processes. Diffuse layer model can give an excellent fits with SOSr+ and (SO)(2)Sr(OH) (2) (2-) inner-sphere surface complexes.