Abstract

In this study, a modified metal hydroxides on surface of Lewatit resin (HMO @LM500, where M indicates to Al, Fe, Mn or Zn) were designed and used as efficient adsorbents for uranium (U(VI)) ions capture from aqueous solution. The prepared materials were characterized by using transform infrared spectroscopy, scanning electron microscope, energetic dispersive x-ray techniques. Batch adsorption methods were done to investigate all factors affecting adsorption process such as the effect of pH, concentration, contact time and temperature. Optimum values of each parameter were calculated as pH of 1.8, temperature of 298 K (25 °C), contact time of 60 min for the removal of uranium ions. Analysis within the nonlinear isotherm models indicates that the Liu model offers the best description for the equilibrium data since it has the highest R² value and the lowest error analysis value when compared with the other models. The calculated adsorption capacity of Liu model is 217.06 mg g⁻¹, whereas analysis within the nonlinear kinetic models indicate that pseudo-second-order behavior is involved. The thermodynamic examination of the equilibrium data proved that the adsorption process of U(VI) was found to be a spontaneous and exothermic process. The ΔH⁰ and ΔS⁰ parameters were calculated as −66.5827 kJ mol⁻¹ and −0.2051 kJ mol⁻¹ K⁻¹, respectively. Therefore, the prepared adsorbent can be applied to capture of U(VI) ions from aqueous medium.

摘要

在这项研究中，设计了一种在 Lewatit 树脂表面改性的金属氢氧化物（HMO @LM500，其中 M 表示 Al、Fe、Mn 或 Zn），并将其用作从水溶液中捕获铀 (U(VI)) 离子的高效吸附剂. 采用变换红外光谱、扫描电子显微镜、能量色散X射线等技术对制备的材料进行了表征。采用间歇吸附法研究影响吸附过程的所有因素，如 pH、浓度、接触时间和温度的影响。每个参数的最佳值计算为 pH 值为 1.8，温度为 298 K（25°C），接触时间为 60 分钟以去除铀离子。非线性等温线模型内的分析表明，Liu 模型提供了对平衡数据的最佳描述，因为它具有最高的R ²值和与其他模型比较时的最低误差分析值。Liu 模型的计算吸附容量为 217.06 mg g ^-1，而非线性动力学模型中的分析表明涉及伪二级行为。平衡数据的热力学检验证明U(VI)的吸附过程被发现是一个自发的放热过程。ΔH 0和ΔS 0^参数分别计算为-66.5827 kJ mol ^-1和-0.2051 kJ mol ^-1 K ^-1。因此，所制备的吸附剂可用于从水性介质中捕获 U(VI) 离子。