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Facile sustainable upcycling of fly ash into multifunctional durable superhydrophobic coatings

Lookup NU author(s): Sunanda Roy, Dr Kheng-Lim GohORCiD

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Abstract

© 2024 Elsevier B.V.Fly ash (FA), a hazardous byproduct of coal combustion in power plants, poses significant environmental and health risks due to improper disposal and utilization. This study introduces a facile, sustainable, and cost-effective method for converting FA into a robust superhydrophobic material for various substrates. -FA particles are modified with polydopamine (PD) in water and covalently grafted with octadecylamine (ODA) via the Michael Addition-Schiff Base reactions, resulting in robust superhydrophobic FA (SH-FA) with a water contact angle (WCA) of 163° (±3.1). When applied as a coating to jute, cotton, polyester fibers, PU sponge, and wood, they became superhydrophobic, with WCAs ranging from 154.7 to 161.2° except for the wood substrate, which achieved a WCA of 132° (±3°). The coated polyester fabric exhibited remarkable durability, retaining consistent WCA values after 70 abrasion cycles, 75 adhesive tape peelings, and 20 detergent washing cycles. It also showcased excellent self-cleaning properties, effectively repelling dust and various liquids. Additionally, the coated PU sponge demonstrated exceptional performance in separating oil from different oil/water mixtures, achieving rapid separation of organic solvents within seconds and maintaining a separation efficiency of over 98% even after 12 reuse cycles. These results indicate the potential for transforming FA through effective management.

Publication metadata

Author(s): Roy S, Pham HD, Latif M, Kim JW, Park G, Kim J, Ghosh BD, Goh KL

Publication type: Article

Publication status: Published

Journal: Progress in Organic Coatings

Year: 2024

Volume: 197

Print publication date: 01/12/2024

Online publication date: 31/08/2024

Acceptance date: 23/08/2024

ISSN (print): 0300-9440

ISSN (electronic): 1873-331X

Publisher: Elsevier B.V.

URL: https://doi.org/10.1016/j.porgcoat.2024.108770

DOI: 10.1016/j.porgcoat.2024.108770

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