Abstract：P-calix[4]arene acetate was synthetized by the main reaction substrates, p-tert-butyl-calix[4]arene and ethylbromoacetate, subsequently loaded onto zeolite. Infrared spectra demonstrated that the synthetized compound had the structure characteristics of p-calix[4]arene acetate; Scanning electron microscope analysis indicated that p-calix[4]arene acetate was loaded on zeolite successfully, evenly and dispersedly. By the static experiments, the results showed that when the pH = 4, absorbent dosage was 0.5g, initial uranium concentration was 10mg/L, p-calix[4]arene acetate/zeolite = 0.025/1, and the reaction time was 30min, the adsorption efficiency of zeolite increased from about 30 % to 93 % after loadeding p-calix[4]arene acetate. Besides, the adsorption reactions of uranium by zeolite and zeolite loaded with p-calix [4]arene acetate (Referred to as the loaded zeolite) could be both described by pseudo-second-order kinetic model, while the absorption rate of loaded zeolite was faster than that of zeolite. Moreover, both of the 2 absorption reactions followed the Langmuir adsorption isotherm, whereas the maximum adsorption amount inferred by Langmuir model ascended from 16.8919 to 32.5733mg/g, which was due to fact that zeolite had increased the absorption sites on its surface after loading p-calix[4]arene acetate. In addition, infrared spectra analyses before and after adsorbing uranium demonstrated that the loaded zeolite mainly depended on the strong complexion of p-calix[4]arene acetate and the sorption of Si-O and Al-O to remove uranium, and these 2kinds of functions affected synergistically to speed up the rate of adsorption and increase adsorption amount.
