Wang Rui, Lin Juan, Huang Shuang-Hui, Wang Qiu-Yue, Hu Qiuhui, Peng Si, Wu Li-Na, Zhou Qing-Han
Key Laboratory of Basic Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, First Ring Road, 4th Section No. 16, 610041 Chengdu, China.
School of Biomedical Sciences and Technology, Chengdu Medical College, Xindu Road No. 783, 610500 Chengdu, China.
ACS Omega. 2020 Dec 28;6(1):976-987. doi: 10.1021/acsomega.0c05623. eCollection 2021 Jan 12.
The efficient selectivity of heavy metal ions from wastewater is still challenging but gains great public attention in water treatment on a world scale. In this study, the novel disulfide cross-linked poly(methacrylic acid) iron oxide (FeO@S-S/PMAA) nanoparticles with selective adsorption, improved adsorption capability, and economic reusability were designed and prepared for selective adsorption of Pb(II) ions in aqueous solution. In this study, nuclear magnetic resonance, dynamic light scattering, scanning electron microscopy, X-ray diffraction, vibrating sample magnetometry, and thermogravimetric analysis were utilized to study the chemophysical properties of FeO@S-S/PMAA. The effect of different factors on adsorption properties of the FeO@S-S/PMAA nanoparticles for Co(II) and Pb(II) ions in aqueous solution was explored by batch adsorption experiments. For adsorption mechanism investigation, the adsorption of FeO@S-S/PMAA for Co(II) and Pb(II) ions can be better fitted by a pseudo-second-order model, and the adsorption process of FeO@S-S/PMAA for Co(II) and Pb(II) matches well with the Freundlich isotherm equation. Notably, in the adsorption experiments, the FeO@S-S/PMAA nanoparticles were demonstrated to have a maximum adsorption capacity of 48.7 mg·g on Pb(II) ions with a selective adsorption order of Pb > Co > Cd > Ni > Cu > Zn > K > Na > Mg > Ca in the selective experiments. In the regeneration experiments, the FeO@S-S/PMAA nanoparticles could be easily recovered by desorbing heavy metal ions from the adsorbents with eluents and showed good adsorption capacity for Co(II) and Pb(II) after eight recycles. In brief, compared to other traditional nanoadsorbents, the as-prepared FeO@S-S/PMAA with improved adsorption capability and high regeneration efficiency demonstrated remarkable affinity for adsorption of Pb(II) ions, which will provide a novel technical platform for selective removal of heavy metal ions from actual polluted water.
从废水中高效选择性去除重金属离子仍然具有挑战性，但在全球范围内的水处理领域受到了公众的高度关注。在本研究中，设计并制备了具有选择性吸附、提高吸附能力和经济可重复使用性的新型二硫键交联聚（甲基丙烯酸）氧化铁（FeO@S-S/PMAA）纳米颗粒，用于水溶液中Pb(II)离子的选择性吸附。在本研究中，利用核磁共振、动态光散射、扫描电子显微镜、X射线衍射、振动样品磁强计和热重分析来研究FeO@S-S/PMAA的化学物理性质。通过批量吸附实验探索了不同因素对FeO@S-S/PMAA纳米颗粒对水溶液中Co(II)和Pb(II)离子吸附性能的影响。对于吸附机理研究，FeO@S-S/PMAA对Co(II)和Pb(II)离子的吸附可以更好地用准二级模型拟合，并且FeO@S-S/PMAA对Co(II)和Pb(II)的吸附过程与Freundlich等温方程匹配良好。值得注意的是，在吸附实验中，FeO@S-S/PMAA纳米颗粒在选择性实验中对Pb(II)离子的最大吸附容量为48.7 mg·g，选择性吸附顺序为Pb > Co > Cd > Ni > Cu > Zn > K > Na > Mg > Ca。在再生实验中，可以通过用洗脱剂从吸附剂上解吸重金属离子轻松回收FeO@S-S/PMAA纳米颗粒，并且在八次循环后对Co(II)和Pb(II)仍显示出良好的吸附容量。简而言之，与其他传统纳米吸附剂相比，所制备的具有提高的吸附能力和高再生效率的FeO@S-S/PMAA对Pb(II)离子的吸附表现出显著亲和力，这将为从实际污染水中选择性去除重金属离子提供一个新的技术平台。
