Xia Simeng, Deng Lin, Liu Xia, Yang Lingfang, Yang Xiuzhen, Shi Zhou, Pei Yong
Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, PR China.
Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, PR China.
J Hazard Mater. 2022 Feb 5;423(Pt B):127219. doi: 10.1016/j.jhazmat.2021.127219. Epub 2021 Sep 15.
Herein, novel magnetic nickel incorporated carbon nanofibers (Ni@CNF) were successfully synthesized via electrostatic spinning method for sulfadiazine (SDZ) adsorption. We combined computational and experimental tools to clarify the distinct nature of SDZ on Ni@CNF. Extensive computations and characterizations of SDZ-Ni adsorption complexes evidenced that Ni atoms were indispensable for SDZ adsorption and increasing the number of Ni atoms in Ni@CNF significantly improved SDZ adsorption due to the lower adsorption energy (E). As we surmised, the adsorption capacity of Ni@CNF enhanced gradually with increasing the mass ratio of Ni in the composite. The as-prepared 9%Ni@CNF achieved removal efficiency of 98.9% for SDZ (2.5 mg/L) in 25 min, while the pure CNF hardly removed any SDZ under the identical conditions. The experimental data was better fitted by the Langmuir model with the maximum monolayer adsorption capacity of 103.21 mg/g at 318 K. Besides, the 9%Ni@CNF exhibited great applicability to various organic contaminants, and excellent stability and reusability over five consecutive cycles. Overall, for the first time, we provide the evidence that Ni atoms in the Ni@CNF plays a crucial role in SDZ adsorption, which can guide us for constructing nickle incorporated adsorbents with impressive adsorption capacity in environmental remediation.
在此，通过静电纺丝法成功合成了新型磁性镍掺杂碳纳米纤维（Ni@CNF）用于吸附磺胺嘧啶（SDZ）。我们结合计算和实验工具来阐明SDZ在Ni@CNF上的独特性质。对SDZ-Ni吸附复合物进行的大量计算和表征表明，Ni原子对于SDZ吸附是不可或缺的，并且由于较低的吸附能（E），增加Ni@CNF中Ni原子的数量可显著提高SDZ吸附量。正如我们所推测的，Ni@CNF的吸附容量随着复合材料中Ni质量比的增加而逐渐增强。所制备的9%Ni@CNF在25分钟内对2.5mg/L的SDZ去除效率达到98.9%，而在相同条件下纯CNF几乎不能去除任何SDZ。实验数据与Langmuir模型拟合得更好，在318K时最大单层吸附容量为103.21mg/g。此外，9%Ni@CNF对各种有机污染物表现出良好的适用性，并且在连续五个循环中具有出色的稳定性和可重复使用性。总体而言，我们首次提供证据表明Ni@CNF中的Ni原子在SDZ吸附中起关键作用，这可以指导我们构建在环境修复中具有令人印象深刻吸附容量的镍掺杂吸附剂。
