Preparation and Characterization of β-Cyclodextrin/Poly(acrylic acid)/Permutite Hydrogel Composite for U(Ⅵ) Adsorption

【摘要】 Uranium in the environment can damage human health and ecosystem. There is a need for excellent adsorbents to remove U(Ⅵ) from aqueous solutions. Here we synthesized a novel β-cyclodextrin/poly(acrylic acid)/permutite(CAP) hydrogel composite by a simple method. Physicochemical characterizations of the materials were conducted by XRD, FTIR, SEM, EDX, and TGA. The effect of pH value, contact time, initial U(Ⅵ) concentration, and temperature were researched. A pseudo-second-order kinetic model, intra-particle diffusion model, and Langmuir isotherm model were used to describe the U(Ⅵ) adsorption behavior, and the maximum adsorption capacity of U(Ⅵ) was 833.33 mg/g at 25 ℃. Thermodynamic analysis showed that the adsorption process of U(Ⅵ) was endothermic and spontaneous. Furthermore, the excellent reusability indicated that CAP hydrogel composite could be potentially used as a promising sorbent for the removal of U(Ⅵ) in wastewater.更多还原

【Abstract】 Uranium in the environment can damage human health and ecosystem. There is a need for excellent adsorbents to remove U(Ⅵ) from aqueous solutions. Here we synthesized a novel β-cyclodextrin/poly(acrylic acid)/permutite(CAP) hydrogel composite by a simple method. Physicochemical characterizations of the materials were conducted by XRD, FTIR, SEM, EDX, and TGA. The effect of pH value, contact time, initial U(Ⅵ) concentration, and temperature were researched. A pseudo-second-order kinetic model, intra-particle diffusion model, and Langmuir isotherm model were used to describe the U(Ⅵ) adsorption behavior, and the maximum adsorption capacity of U(Ⅵ) was 833.33 mg/g at 25 ℃. Thermodynamic analysis showed that the adsorption process of U(Ⅵ) was endothermic and spontaneous. Furthermore, the excellent reusability indicated that CAP hydrogel composite could be potentially used as a promising sorbent for the removal of U(Ⅵ) in wastewater.更多还原