Journal
CHEMICAL ENGINEERING JOURNAL
Volume 381, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122559
Keywords
Trivalent arsenic; Wastewater; Zero-valent iron; COFs; Adsorption
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Funding
- National Key R&D Program of China [2017YFC0210500]
- National Natural Science Foundation of China [21806105, 21677096]
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The chemical valence state of arsenic changed with the redox state which influenced by the aquatic environmental factors. One challenge for arsenic control is the depth removal of trivalent arsenic (As(III)) from wastewater from non-ferrous industries. Immobilization of As(III) could be realized through an enhanced adsorption method. In this study, zero-valent iron (Fe-0) nanoparticles assembled on porous covalent organic frameworks (COFs) were selected as nanotraps for arsenic ions capture and surface stabilization. Fe-0/TAPB-PDA COFs composites were synthesized through an in-situ growth method. The porous surface of COFs offered efficient spaces for Fe-0 loading as well as the reaction sites. The results showed that Fe-0/COFs exhibited a better performance in As(III) adsorption than pure nZVI (nanoscale zero-valent iron), and the maximum adsorption capacity reached to 135.78 mg/g. In addition, the effects of co-existed anions and metal ions were also investigated. Such a novel composite exhibited a huge potential for heavy metals purification in future study.
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