Moghtaderi Shiva, Saberyan Kamal, Sid Kalal Hossein, Mozaffari Shahla, Khamseh Ali A Gh, Nozad Golikand Ahmad
Department of Chemistry, Payame Noor University (East Tehran Branch), Tehran, Iran.
Nuclear Fuel Research School, Nuclear Science and Technology Research Institute, AEOI, P.O. Box 11365-3486, Tehran, Iran.
Sci Rep. 2024 Oct 28;14(1):25756. doi: 10.1038/s41598-024-77551-y.
In this research work, the adsorption process of iridium using magnetic nanoparticles functionalized with Cyanex 471X has been investigated. In this regard, parameters affecting the adsorption process such as pH, initial concentration of iridium ions, contact time and adsorbent dosage were assessed. According to the results, pH 6, adsorbent dosage 1.2 g/L, initial concentration of iridium of 10 mg/L, and contact time of 10 min were selected as optimal conditions for iridium adsorption by this synthesized magnetic nanosorbent. The kinetics of the adsorption process was studied, and it was found that the adsorption reaction follows the pseudo-second-order kinetic model with the correlation coefficient of 0.9960. Also, experimental studies indicated that the Langmuir adsorption isotherm model best matches the experimental data (R = 0.9961). The maximum adsorption capacity of the nanosorbent for iridium adsorption was estimated to be 35.34 mg/g by the Langmuir isotherm. With the thermodynamic analysis of the adsorption process, it was found that this process is endothermic and spontaneous. In addition, in the investigation of iridium adsorption and desorption, HCl/HNO solution with a concentration of 1.5 M was selected as suitable eluent.
在本研究工作中，对用Cyanex 471X功能化的磁性纳米颗粒吸附铱的过程进行了研究。在此方面，评估了影响吸附过程的参数，如pH值、铱离子初始浓度、接触时间和吸附剂用量。根据结果，选择pH值6、吸附剂用量1.2 g/L、铱初始浓度10 mg/L以及接触时间10分钟作为该合成磁性纳米吸附剂吸附铱的最佳条件。研究了吸附过程的动力学，发现吸附反应符合伪二级动力学模型，相关系数为0.9960。此外，实验研究表明，朗缪尔吸附等温线模型与实验数据最匹配（R = 0.9961）。根据朗缪尔等温线，该纳米吸附剂对铱吸附的最大吸附容量估计为35.34 mg/g。通过对吸附过程的热力学分析，发现该过程是吸热且自发的。此外，在铱吸附和解吸的研究中，选择浓度为1.5 M的HCl/HNO溶液作为合适的洗脱剂。
