The aim of the present study was to produce a high capacity and steady absorbent 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⁻¹ according to the linear and non-linear regression analysis of the Langmuir isotherm, respectively. The sorption mechanism followed to pseudo-second-order kinetics. The thermodynamic parameters (standard enthalpy (ΔH° = -23.46 kJ mol⁻¹), entropy (ΔS° = 0.02 J mol⁻¹ K⁻¹), and free energy (ΔG°)) were determined and the results indicated that the adsorption system was exothermic, spontaneous and favorable.

本研究的目的是生产一种高容量且稳定的吸收剂，能够分离在不同pH和浓度下由核燃料循环过程产生的铀离子。在分批系统中研究了AC / PAN（活性炭/聚丙烯腈）复合吸附剂对铀的吸附作用，它是pH，接触时间，初始金属离子浓度，温度和吸附剂浓度的函数。通过线性和非线性回归分析的比较描述了吸附机理。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28.45 mg g ^-1。吸附机理遵循伪二级动力学。热力学参数（标准焓（ΔH°= -23.46 kJ mol^确定了-1），熵（ΔS°= 0.02 J mol ^-1 K ^-1）和自由能（ΔG°），结果表明该吸附系统是放热的，自发的并且良好。