Synthesis and application of p-tert-butylcalix[8]arene immobilized material for the removal of azo dyes

▶ Sorption behavior investigation of p-tert-butyl-calix[8]arene immobilized material4. ▶ Azo dyes (i.e. RB-5 and RR-45) were used as sorbate. ▶ Optimization of different parameters to evaluate sorption performance of material 4. ▶ Sorption efficiency of resin 4 for RB-5 and RR-45 azo dyes is highly pH dependent. ▶ The sorption data was evaluated by sorption isotherms.