Wang Yan, Zhang Yong, Liu Xiaolin, Sun Sen, Qin Shiyi, Huang Jiaqi, Chen Bowei
School of Mathematics and Physics, Mianyang Teachers' College, Mianyang 621000, PR China.
State Key Laboratory of Environment-friendly Energy Materials, Sichuan Co-Innovation Center for New Energetic Materials, National Co-innovation Center for Nuclear Waste Disposal and Environmental Safety, Nuclear Waste and Environmental Safety Key Laboratory of Defense, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, China.
Dalton Trans. 2023 Sep 13;52(35):12296-12307. doi: 10.1039/d3dt01853a.
Herein, magnetic layered double oxides coated with carbon dots (MLCs) were synthesized through introducing sodium dodecylbenzene sulfonate and FeCl into Co/Al LDH for capturing uranium from aqueous solution. When the molar ratio of Co to Al was 4 : 1, the MLC composite possessed the strongest affinity to uranium(VI) in solution with short equilibrium time (<160 min), high adsorption efficiency (94.31%) and large removal capacity (513.85 mg g). The adsorption behavior of MLCs for uranium(VI) was well fitted with Langmuir and pseudo-second-order models, suggesting that the monolayer chemical adsorption was the rate-limiting step. Besides, MLC-3 could be reused by using 0.15 mol L ethylene diamine tetraacetic acid as an eluent and the removal percentage still remained at a high level (>83.3%) after 5 adsorption/desorption cycles. Redox reaction, chemical complexation and electrostatic attraction were proved to play significant roles in uranium(VI) separation. Therefore, MLC-3 could be used as a potential adsorbent in uranium(VI)-containing wastewater treatment due to its excellent adsorption performance for uranium(VI).
在此，通过将十二烷基苯磺酸钠和FeCl引入Co/Al层状双氢氧化物（LDH）中合成了碳点包覆的磁性层状双氧化物（MLCs），用于从水溶液中捕获铀。当Co与Al的摩尔比为4∶1时，MLC复合材料对溶液中的铀（VI）具有最强的亲和力，平衡时间短（<160分钟）、吸附效率高（94.31%）且去除容量大（513.85毫克/克）。MLCs对铀（VI）的吸附行为与Langmuir模型和准二级模型拟合良好，表明单层化学吸附是限速步骤。此外，MLC-3可以用0.15摩尔/升乙二胺四乙酸作为洗脱剂进行再生，经过5次吸附/解吸循环后，去除率仍保持在较高水平（>83.
