期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 774, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.144974
关键词
Montmorillonite; Multifunctional adsorbent; Interlayer space; Zwitterionic surfactant; Tetrachloroferrate
资金
- National Natural Science Foundation of China [41902040, 41872044]
- National Science Fund for Distinguished Young Scholars [41825003]
- Science and Technology Planning of Guangdong province, China [2020B1212060055]
- Guangdong Special Support Program [2017TX04Z243]
- CAS Interdisciplinary Innovation Team [JCTD-2019-15]
- Youth Innovation Promotion Association CAS [2020347]
- Key R&D Program of Scientific Research Institutions in Guangdong Province [2020B0101370003]
The article presents a novel montmorillonite-based multifunctional adsorbent prepared through multiple methods, demonstrating high efficiency in removing both organic and inorganic contaminants from water, including hydrophobic organic pollutants, oxyanions, and heavy metal cations.
Intercalating various functional species into the interlayer space is an effective strategy to multi-functionalize 2D materials (e.g., montmorillonite, Mnt), but general limitations have emerged therefrom: (1) various intercalated species compete for the limited interlayer space, and (2) the neighboring intercalated species probably inhibit each other's reactivity. Herein, we have synthesized a novel Mnt-based multifunctional adsorbent (HFO-AZ16Mnt) via intercalation of zwitterionic surfactant (Z16), acid activation by chloric acid, and introduction of hydrated ferric oxides (HFOs). The acid activation can lead to formation of porous nanosilica, which serves as the new active sites for supporting HFO nanoparticles. Employing tetrachloroferrate (FeCl4-) as an anionic precursor of HFOs can help preserve the sulfonyl group (-SO3-) of Z16 from being electrostatically occupied during the HFO introduction. As a result, HFO-AZ16Mnt can separately and effectively host Z16 and HFOs. The unique structure endows HFO-AZ16Mnt with the efficiency on simultaneous removal of hydrophobic organic contaminants, oxyanions, and heavy metal cations (nitrobenzene, phosphate, and Cd(II), respectively in this study) from water. Particularly, HFO-AZ16Mnt exhibits impressive capacity towards Cd(II) in both the single- (26.1 mg/g) and the multi-contaminant system (30.6 mg/g). This work has demonstrated a new strategy to multi-functionalize Mnt, and provided a promising novel Mnt-based multifunctional adsorbent for simultaneous and effective removal of organic and inorganic contaminants from water. (C) 2021 Elsevier B.V. All rights reserved.
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