Abstract
In this paper, a novel superhydrophobic magnetic sawdust (SMSD) was fabricated as an oil sorbent. The SMSD was functionalized with Fe3O4 nanoparticles using melamine formaldehyde resin (MFR) as a coupling agent and subsequently hydrophobically-treated with hexadecyltrimethoxysilane (HDTMS). The SMSD showed excellent superhydrophobicity with the water contact angle of 155.3 ± 0.9°. Meanwhile it had remarkable environmental durability, long-term stability, and mechanical durable properties. Taking advantage of its magnetic characteristics, the SMSD could be easily controlled to absorb oil to separate oil–water mixtures with high oil absorption capacity and good reusability. Moreover, the emulsion was successfully separated by SMSD, including water-in-oil and oil-in-water emulsions. This study developed an effective oil absorbent, which was low cost and environmentally-friendly.
Highlights
Oil spill problems have become more and more serious in water pollution, which is a major threat to human life and the ecosystem [1,2,3,4]
Superhydrophobic surfaces have been focused with the apparent contact angle of water (WCA) larger than 150◦ and sliding angle (SA) lower than 10◦ [7]
The the superhydrophobic magnetic sawdust was successfully obtained, which was abbreviated to SMSD
Summary
Oil spill problems have become more and more serious in water pollution, which is a major threat to human life and the ecosystem [1,2,3,4]. The most widely used technologies for preparing superhydrophobic materials include the template method [11], chemical etching [12], chemical or physical vapor deposition [13], layer-by-layer self-assembly [14], thermal decomposition [15], electrostatic spinning [16], the sol–gel process, and impregnation technology [17]. As a renewable natural resource, sawdust is a readily available by-product of the traditional adsorbent, sawdust is an effective substrate to prepare a superhydrophobic surface for oil wood and paper industries. Sawdust was selected as the substrate to prepare a superhydrophobic oil sorbent by by the coating of Fe3O4 nanoparticles and self-assembly of hexadecyltrimethoxysilane (HDTMS).
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