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Magnetic mesoporous TiO2 microspheres for sustainable arsenate removal from acidic environment

Abstract

The carcinogenic arsenic pollution in ground water seriously threats the health and life of human all over the world. It is highly desired to fabricate new materials for sustainable arsenate removal with high capacity, stability and recyclability. In this study, we demonstrate that uniform magnetic core-shell structured Fe3O4@Resorcinol-Formaldehyde@mesoporous TiO2 micro-spheres (denoted as Fe3O4@RF@mTiO2) can function as an excellent adsorbent for fast removing arsenate (AsV) in acidic environment with very high efficiency. The mesoporous TiO2 outer shell (50 nm in thickness) endows it with a high surface area of 337 m2g−1 and a large pore volume of 0.42 cm3g−1, thus resulting in a fast adsorption rate (1.16 gmg−1h−1) and high adsorption capacity (up to 139 mgg−1) calculated by the Langmuir model at a pH of 3. The inner Fe3O4 core (130 nm in diameter) makes it facile separation from wastewater using a magnet. Moreover, the hydrophobic property of RF interlayer (10 nm in thickness) is increased after the calcination at 200 C, which can protect the inner Fe3O4 cores against etching from acid solution over long cycles. In addition, the study of AsV adsorption mechanism on the core-shell mesoporous Fe3O4@RF@mTiO2 microspheres show the existence of electrostatic force and surface complexion interactions between arsenate and partially crystallized TiO2. Benefiting from all the advantages, the multilayer magnetic core-shell structured design is expected to be a promising nanomaterials for long-term wastewater treatment.

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Publication details

The article was received on 22 Jun 2018, accepted on 10 Jul 2018 and first published on 11 Jul 2018


Article type: Research Article
DOI: 10.1039/C8QI00588E
Citation: Inorg. Chem. Front., 2018, Accepted Manuscript
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    Magnetic mesoporous TiO2 microspheres for sustainable arsenate removal from acidic environment

    Y. Zhao, C. Wang, S. Wang, C. Wang, Y. Liu, A. Areej Abdulkareem, H. Wael N., L. Duan, W. Li and D. Zhao, Inorg. Chem. Front., 2018, Accepted Manuscript , DOI: 10.1039/C8QI00588E

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