Cumhuriyet University, Zara Vocational School, Department of Food Technology, 58140 Sivas, Turkey.
Int J Biol Macromol. 2021 Jul 31;183:1640-1648. doi: 10.1016/j.ijbiomac.2021.05.130. Epub 2021 May 24.
The present paper describes a green and cost-effective approach to investigate chitosan-sepiolite (Ch-Sep) composite as an adsorbent for removal of UO ions in aqueous solution. The Ch-Sep composite was prepared as a beads using with two cross-linking agents: tripolyphosphate (TPP) and epichlorohydrin (ECH). Their adsorption properties for the removal of UO ions in aqueous solution by batch experimental conditions were studied. The adsorptive removal processes of UO ions from aqueous solution were evaluated by Langmuir, Freundlich and Dubinin-Radushkevich isotherm models, and was found to be perfectly fit to the Langmuir model (R = 0.971). The maximum adsorption capacity was 0.220 mol kg at 25 °C from Langmuir isotherm model. Adsorption energy was 12.1 kJ mol indicating that the adsorption process was chemical. The adsorption kinetics followed the pseudo second order and intra particle diffusion models. The thermodynamics parameters of UO ions removal from aqueous solution was confirmed spontaneous, endothermic and possible at higher temperatures behavior of adsorption process. The adsorption mechanism of UO ions onto Ch-Sep composite beads was investigated by FT-IR and SEM analysis. These findings revealed the effectiveness and potential of the newly synthesized Ch-Sep composite beads for the removal of UO ions.
本文描述了一种绿色且经济有效的方法，用于研究壳聚糖-海泡石（Ch-Sep）复合材料作为一种吸附剂，用于去除水溶液中的 UO 离子。Ch-Sep 复合材料通过使用两种交联剂：三聚磷酸钠（TPP）和表氯醇（ECH）制备成珠状。通过批实验条件研究了它们在水溶液中去除 UO 离子的吸附性能。通过 Langmuir、 Freundlich 和 Dubinin-Radushkevich 等温模型评估了 UO 离子从水溶液中的吸附去除过程，发现其完美符合 Langmuir 模型（R = 0.971）。从 Langmuir 等温模型得出，25°C 时最大吸附容量为 0.220 mol kg。吸附能为 12.1 kJ mol，表明吸附过程是化学吸附。吸附动力学遵循拟二级和内扩散模型。从水溶液中去除 UO 离子的热力学参数证实了吸附过程是自发的、吸热的，并且可能在较高温度下进行。通过 FT-IR 和 SEM 分析研究了 UO 离子在 Ch-Sep 复合珠上的吸附机理。这些发现表明，新合成的 Ch-Sep 复合珠对于去除 UO 离子具有有效性和潜力。
