| At present, cyclodextrins(CD) as a kind of natural and pollution-free macromolecule organic compound, have very important fields in various nsapplicatio. In spite of this, the natural cyclodextrins have some shortcomings. Therefore, modifying the natural cyclodextrins is very important to overcome the shortcomings of them. After chemical modification, many kinds of cyclodextrins derivatives can be prepared,the physical and chemical properties of these derivatives can also be improved accordingly. β-CD as the most wide application range in three kinds of cyclodextrins(alpha, beta, and lambda), the size of hydrophobic inner cavity of it can match with the size of lots of molecular. It can selectively identify the similar structure and performance object molecular to form inclusion complexes by the hydrophobic forces,electrostatic forces, van der Waals force and hydrogen bond force, and all aspects of performance of inclusion complexes are better than the naturalβ-CD. Therefore, the study of β-CD has been a focus for domestic and foreign researchers. The main goal of this paper is prepared a new type ofβ-CD inclusion complex, namely β-CD-6-OTs inclusion complex ofdibenzoy, and the adsorption performance were investigate. The main parts of the paper include the following fives aspects:1. β-CD and their derivatives were brief overview, as well as the common preparation methods and applications of β-CD inclusion complexes were summarized, and finally the main research contents of this project was put forward.2. β-CD-6-OTs was prepared by the heterogeneous synthetic method and were characterized using FT-IR, 1HNMR and DSC-TGA. The experimental results show that this method is simple and reliable, and the preparation of β-CD-6-OTs can be used as raw material for the next product.3. β-CD-6-OTs inclusion complex of dibenzoy was prepared by the coprecipitation method, it was preliminary characterized using FT-IR, the bonding properties of β-CD-6-OTs and dibenzoy was explored using UV-vis and the thermal stability was analyzed using DSC-TGA, finally it was also characterized using 1HNMR and elemental analyzer. The results show that this method is scientific and reasonable, the inclusion effect ofβ-CD-6-OTs for dibenzoyl is excellent, and the inclusion constants can be as high as 95.49 %.4. β-CD-6-OTs inclusion complex of dibenzoy as sorbent was used to study the adsorption of Th(Ⅳ) ion, and the sorbent before and after adsorption of Th(Ⅳ) ion were characterized by FT-IR and SEM, theadsorption effect of sorbent for Th(Ⅳ) ion was explored under different imereaction t, p H value, initial concentration of Th(Ⅳ), temperature and various interference ions. The experiment results show that the maximum adsorption capacity Qm is 17.83 mg/g and adsorption rate is87.8 % when(28)min20t, 3.0p H(28), mg/L20C0(28). At the same time, in the presence of five kinds of interference ions, such as Mg2+, Pb2+, Zn2+,Fe3+ and Cd2+, sorbent can effectively adsorb Th(Ⅳ) ion. In addition, the adsorption process of sorbent for Th(Ⅳ) ion is in line with the adsorption kinetics and thermodynamic models, HNO3(p H=3.0) can effectively strip Th(Ⅳ) ion, and the recovery rate is as high as 99.2 %.5. Besides Th(Ⅳ) ion adsorption, it was also applied to the adsorption study of another kind of radioactive U(Ⅵ) ion. The sorbent before and after adsorption of U(Ⅵ) ion were characterized by IR-FT and SEM, the adsorption effect of sorbent for U(Ⅵ) ion was explored under different imereaction t, p H value, initial concentration of U(Ⅵ), temperature and various interference ions. The experiment results show that the maximum adsorption capacity Qm is 12.16 mg/g and adsorption rate is 91.2 % when(28)min60t, 4.5p H(28), mg/L20C0(28).When the concentration of Mg2+, Fe3+, Cu2+, Mn2+ and Pb2+ less than or equal to 15 mg/L, sorbent can effectively adsorb U(Ⅵ) ion. In addition,the Pseudo-second-order kinetic equation is more suitable to describe the adsorption process through the adsorption dynamics models, namely itoccurs mainly chemical adsorption process. By comparing the parameters between Langmuir isotherm adsorption model(R2=0.9907) and the Freundlich isothermal adsorption model(R2=0.9810), the Langmuir isotherm adsorption model is more suitable to describe the adsorption process, namely sorbent for U(Ⅵ) ion is monolayer adsorption, and adsorption process mainly occurs in its surface. Adsorption thermodynamic models show that the adsorption of sorbent for U(Ⅵ) ion is a spontaneous endothermic. HCl(8 m L 0.4 mol/L) can effectively strip U(Ⅵ) ion, and the recovery rate is as high as 99.1 %. This project provides certain reference basis for the adsorption of U(Ⅵ) ion. |
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