Abstract
A new silica adsorbent, C7C6CalixSi, was prepared by intermolecular hybridization. It was achieved by introducing and immobilizing a macrocyclic C7C6Calix into the pores of the hybrid silica carrier specially developed. FT-IR, SME, TG-DSC, BET, and XAR were utilized to characterize the structure of the adsorbent. C7C6Calix was successfully introduced into the macroporous silica carrier by self-assembly. The adsorption of Cs and other typical metals toward C7C6CalixSi was investigated in the range of 0.4 to 5.0 M HNO3. C7C6CalixSi had an excellent adsorption ability and selectivity for Cs over others, except for Rb. The adsorption capacity of Cs was 0.1233 mM/g at the optimal adsorption conditions of 1.0 M HNO3, 298 K, and a contact time of 120 min. The experimental results fitted well with the Langmuir model. The thermodynamic parameters ΔH°, ΔG°, and ΔS° of Cs uptake were obtained. The stability of C7C6CalixSi was evaluated by TOC content. Some valuable adsorption data of the silica adsorbent in the chem...
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