Ege University Institute of Nuclear Sciences, 35100, Bornova-Izmir, Turkey.
Ege University Institute of Nuclear Sciences, 35100, Bornova-Izmir, Turkey.
Appl Radiat Isot. 2021 Feb;168:109474. doi: 10.1016/j.apradiso.2020.109474. Epub 2020 Oct 17.
The aim of the present study was to produce a high capacity and steady adsorbent able to separate uranium ions resulting from the nuclear fuel cycle process at different pHs and concentrations. AC/PAN (active carbon/polyacrylonitrile) composite adsorbent was investigated in a batch system for uranium sorption as a function of pH, contact time, initial metal ion concentration, temperature and adsorbent concentration. The adsorption mechanism was described through a comparison of linear and nonlinear regression analysis. The adsorption capacity was found to be 27.47 and 28.45 mg g according to the linear and non-linear regression analysis of the Langmuir isotherm, respectively. The adsorption mechanism followed to pseudo-second-order kinetics. The thermodynamic parameters (standard enthalpy (ΔH° = -23.46 kJ mol), entropy (ΔS° = 0.02 J mol K), and free energy (ΔG°)) were determined and the results indicated that the adsorption system was exothermic, spontaneous and favorable.
本研究的目的是制备一种高容量、稳定的吸附剂，使其能够在不同 pH 值和浓度下分离核燃料循环过程中产生的铀离子。以 pH、接触时间、初始金属离子浓度、温度和吸附剂浓度为变量，采用间歇式体系研究了 AC/PAN（活性炭/聚丙烯腈）复合材料吸附剂对铀的吸附作用。通过线性和非线性回归分析比较，对吸附机理进行了描述。根据 Langmuir 等温线的线性和非线性回归分析，吸附容量分别为 27.47 和 28.45mg/g。吸附机理符合拟二级动力学。还确定了热力学参数（标准焓变 (ΔH° = -23.46 kJ/mol)、熵变 (ΔS° = 0.02 J/mol·K) 和自由能变 (ΔG°))，结果表明吸附体系是放热的、自发的和有利的。
