Abstract
Hydrophobic cotton fabrics and sponges were fabricated using a simple hydrothermal method in a mixed solution of carbon nanoparticles (CNPs) generated from candle soot and n-octadecyltrimethoxysilane, within which a cotton fabric was immersed. The negatively charged CNPs firmly bonded to the positively charged surface of the fabric and sponge through electrostatic interactions, resulting in the formation of a chemically durable hydrophobic filter. The separation efficiencies of the hydrophobic fabric and sponge were high for different types of oil, including hexane, iso-octane, chloroform, and canola oil, which had different viscosities and densities. The CNP-coated fabric showed outstanding recycling ability and chemical durability in corrosive chemical environments such as in highly acidic, alkaline, saline, and hot solutions. Moreover, the CNP-coated sponge showed strong absorption of a diverse range of oils, up to 64.1 times the weight of the sponge. The proposed synthesis method shows considerable technical potential for the application of CNP-based hydrophobic coating technology in various methods used for the separation of oily waste.
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