Zhao Yuling, Shi Hao, Du Ze, Zhou Jinlong, Yang Fangyuan
College of Resources and Environment, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, People's Republic of China.
College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, People's Republic of China.
R Soc Open Sci. 2023 Jan 25;10(1):220988. doi: 10.1098/rsos.220988. eCollection 2023 Jan.
The removal of arsenic contamination from the aqueous environment is of great importance in the conservation of the Earth's water resources, and surfactants are a promising material used to modify magnetic nanoparticles to improve adsorption properties. Therefore, it is important to develop efficient and selective adsorbents for arsenic. Surface modification of FeO was carried out using anionic, cationic and zwitterionic surfactants to obtain composite FeO@SDS, FeO@CTAB, FeO@SNC 16 and FeO@NPC 16 (collectively referred to as FeO@surfactants). The synthesized composite FeO@surfactants magnetic nanoparticles were characterized by XRD, TEM and FTIR. The As(V) removal characteristics of the composite magnetic nanoparticles from the aqueous solution were evaluated by adsorption batch experiments which indicated the possibility of effective application of the surfactant-modified FeO magnetic nanoparticles for the removal of As(V) from aqueous solution. The adsorption equilibrium of the composites was reached in 30 min and the kinetic data followed the pseudo-second-order model. Langmuir equation could represent the adsorption isotherm data very well. Moreover, under the identical conditions, FeO@CTAB showed maximum capacity of adsorption for As(V) (55.671 mg g), with its removal efficiency being much higher than that of the other composites. In addition, the FeO@surfactants composite magnetic nanoparticles retained 93.5% of its initial arsenic removal efficiency even after re-using it five times. The mechanism of arsenic adsorption by FeO@surfactants composite magnetic nanoparticles was proved to be complexation via electrostatic attraction, which was mainly innersphere in nature.
从水环境中去除砷污染对于地球水资源保护至关重要，表面活性剂是用于修饰磁性纳米颗粒以改善吸附性能的一种很有前景的材料。因此，开发高效、选择性的砷吸附剂很重要。使用阴离子、阳离子和两性离子表面活性剂对FeO进行表面改性，以获得复合FeO@SDS、FeO@CTAB、FeO@SNC 16和FeO@NPC 16（统称为FeO@表面活性剂）。通过XRD、TEM和FTIR对合成的复合FeO@表面活性剂磁性纳米颗粒进行了表征。通过吸附批次实验评估了复合磁性纳米颗粒从水溶液中去除As(V)的特性，结果表明表面活性剂改性的FeO磁性纳米颗粒可有效应用于从水溶液中去除As(V)。复合材料在30分钟内达到吸附平衡，动力学数据符合准二级模型。Langmuir方程能很好地表示吸附等温线数据。此外，在相同条件下，FeO@CTAB对As(V)的吸附容量最大（55.671 mg/g），其去除效率远高于其他复合材料。另外，FeO@表面活性剂复合磁性纳米颗粒即使重复使用五次后仍保留其初始砷去除效率的93.5%。FeO@表面活性剂复合磁性纳米颗粒吸附砷的机制被证明是通过静电吸引进行络合，本质上主要是内球络合。
