Experimental study on synthesis of azocalix [4] arene derivative with carboxylation functional group and its adsorption of uranium

A novel functionalization material, 5, 11, 17, 23-4 (4-hydroxyazobenzene) -25, 26, 27, 28-calix [4] arene (p-TTPTA), was synthesized. This material was based on the calix [4] arene and decorated with p-aminobenzoic acid on the edge of the calix [4] arene. The p-TTPTA was characterized by FT-IR, ¹H NMR, SEM and EDS. The effects of adsorption time, pH, dosage of p-TTPTA, initial uranium concentration and temperature on the adsorption of uranium by p-TTPTA were investigated. The results show that the p-TTPTA has stable conformation, rough surface, wide specific surface area and chemical compound with uranium. The optimal condition for the adsorption of uranium by p-TTPTA is pH = 5, the initial uranium concentration of 20 mg/L, p-TTPTA dosage of 20 mg, time of 8 h and temperament of 30℃. According to above analysis, p-TTPTA can adsorb better uranium. (authors)