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Mg(OH)2 and PDMS-coated cotton fabrics for excellent oil/water separation and flame retardancy
- Ji, Wanli, Wang, Hongru, Yao, Yijun, Wang, Ruirui
- Cellulose 2019 v.26 no.11 pp. 6879-6890
- cellulose, coatings, contact angle, cost effectiveness, cotton fabric, flame retardants, hydrophobicity, laundry, magnesium hydroxide, nanoparticles, oil spills, oils, pollution, polydimethylsiloxane, risk, solvents
- Oil spillages and discharges have caused serious environmental pollution, and created a high risk of fire and explosion. Intensive studies have been carried out on oil/water separation materials or flame-retardant materials, but the examples of materials with both oil/water separation and flame-retardant properties are rare. Here we investigate a new and simple method to prepare cotton fabrics with superhydrophobicity and flame retardancy, which involved the sequential deposition of magnesium hydroxide (MH) nanoparticles and polydimethylsiloxane (PDMS). The MH nanoparticles could create rough hierarchical structures on the surface of fabrics and provide flame retardant performance, meanwhile the PDMS coating improved the hydrophobicity of the fabrics. The as-coated fabric showed excellent resistance to organic solvent, acid, basic, laundering and abrasion, as well as high flame-retardant performance due to their high char yields and self-extinguishing property. Furthermore, the separation efficiency of the obtained fabric for oil/water mixture exceeded 95%, and the contact angle kept over 150° after 20 cycles. This method is simple, environmentally friendly, cost-effective and feasible for large-scale production, demonstrating great potential in a broad range of applications. An simple method is proposed to prepare cotton fabrics with superhydrophobicity and flame retardancy, which involved the sequential deposition of magnesium hydroxide (MH) nanoparticles and polydimethylsiloxane (PDMS).