Diatomaceous earth incorporated floating magnetic beads for oil removal on water

Sakti, Satya Candra Wibawa and Indrasari, Nindayu and Wijaya, Rizki Ainuna and Fahmi, Mochamad Zakki and Widati, Alfa Akustia and Lee, Hwei Voon and Fujioka, Takahiro and Nuryono, - and Chen, Chun-Hu (2022) Diatomaceous earth incorporated floating magnetic beads for oil removal on water. Environmental Technology & Innovation, 25. ISSN 2352-1864, DOI https://doi.org/10.1016/j.eti.2021.102120.

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Water contamination by oil spills causes severe damage to the environment and human health. Oil adsorbents should be buoyant, effective oil-contact, and regenerable. In this study, diatomaceous-earth (DE)-incorporated magnetic alginate (Alg)-based beads, chemically modified to include phthalic or maleic anhydride (denoted as Alg/DE/Fe3O4 PA and Alg/DE/Fe3O4 -MA), were developed. Internal cavities, formed by cavity-forming agents, made them buoyant. The beads were buoyant and magnetically responsive for 30 days. Maximum oil adsorption capacities of Alg/DE/Fe3O4 -PA and Alg/DE/Fe3O4 MA were 29.7 and 21.0 times their weights, respectively. The pseudo-second order kinetics model (R-2 similar to 0.999, ARE <= 1.088, and chi(2) <= 0.041) and Freundlich isotherm model (R-2 similar to 0.999, ARE <= 0.1, and chi(2) <= 3.37x 10(-3)) were used to determine these values. Both beads were magnetically regenerable for up to 20 cycles. DE pores improved oil adsorption capacity by facilitating intra-bead diffusion of surface adsorbed oil. This was confirmed by micro-structural characterization using surface micrographs, elemental distribution, porosity, thermal stability, crystalline phases, molecular vibrational behavior, and magnetic properties. Scanning electron microscopy and X-ray diffractometry analyses revealed spherical beads with well-distributed Fe3O4 spinel on the surfaces. The two adsorbent beads satisfied the criteria for oil-removal from water: buoyancy, high affinity towards various oil types, and magnetic re-collectability. (C) 2021 The Author(s). Published by Elsevier B.V.

Item Type: Article
Funders: None
Uncontrolled Keywords: Alginate; Diatomaceous earth; Magnetic separation; Oil spill; Buoyancy; Water purification
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QR Microbiology
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 18 Sep 2023 01:19
Last Modified: 18 Sep 2023 01:19
URI: http://eprints.um.edu.my/id/eprint/43053

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