Abstract
Abstract
Sulfonylcalix[4]arenetetrasulfonate-loaded D201 composite (SCAS-D201) was prepared by a simple method and used as an adsorbent for removal of Sr(II) from aqueous solutions. The adsorption of the Sr(II) onto SCAS-D201 composite as a function of contact time, pH, Sr(II), temperature concentration was investigated. Results show that the adsorption capacities of SCAS-D201 composite towards Sr(II) reached a maximum at pH values of ∼7. The adsorption has reached equilibrium within 120 min and the kinetics can be well fitted by a pseudo-second-model. The adsorption isotherm was well fitted by the Langmuir model, and the maximum value of adsorption capacity of the adsorbent was 76.43 mg·g−1. Possible adsorption mechanisms are also analysed.