School of Materials Science and Engineering, State Key Laboratory for Environment-friendly Energy Materials, Southwest University of Science and Technology, 59 Qinglong Road, Mianyang, 621010, People's Republic of China.
National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huaian, 223003, People's Republic of China.
Environ Sci Pollut Res Int. 2021 Apr;28(14):17290-17305. doi: 10.1007/s11356-020-12162-4. Epub 2021 Jan 4.
The efficient separation of low-concentration radionuclides by the eco-friendly adsorbent is a compelling requirement in the development of nuclear industry. Hence, a novel composite consisted of one-dimensional palygorskite (Pal) and three-dimensional pomelo peel (PP) is prepared by self-assembly approach (PP/Pal) and coupling agent approach (PP/KPal) for removing uranium (U(VI)) from aqueous solution. Moreover, the mass ratio (PP/Pal), adsorbent dosage, pH, contact time, temperature, and ionic strength are investigated. Two adsorption kinetic models and isotherm models are used to investigate the kinetic behaviors and adsorption capacity, respectively. The maximum adsorption capacities were 370.5 mg·g on PP/Pal and 357.3 mg·g on PP/KPal at pH 6.0, contact time 150 min and 25 °C. Meanwhile, the composite can be easily separated from water via a simple filtering. Furthermore, thermodynamic parameters indicate that adsorption is an endothermic and spontaneous process. And the surface complexation, ion exchange, and electrostatic attraction play a vital role. This work shows that the PP/Pal composite with high efficiency, low cost, and green has a further application in the treatment of wastewater containing U(VI).
环保型吸附剂对低浓度放射性核素的高效分离是核工业发展的迫切要求。因此，采用自组装法（PP/Pal）和偶联剂法（PP/KPal）制备了一维坡缕石（Pal）和三维柚子皮（PP）组成的新型复合材料，用于从水溶液中去除铀（U（VI））。此外，还考察了质量比（PP/Pal）、吸附剂用量、pH 值、接触时间、温度和离子强度等因素。采用两种吸附动力学模型和等温线模型分别研究了动力学行为和吸附容量。在 pH 值为 6.0、接触时间为 150 min 和 25°C 时，PP/Pal 和 PP/KPal 的最大吸附容量分别为 370.5 和 357.3mg·g。同时，该复合材料可以通过简单过滤轻松从水中分离。此外，热力学参数表明吸附是一个吸热和自发的过程。表面络合、离子交换和静电吸引起着至关重要的作用。这项工作表明，具有高效、低成本和绿色特性的 PP/Pal 复合材料在处理含 U(VI)废水方面具有进一步的应用前景。
