Ampholytic Chitosan/Alginate Composite Nanofibrous
Membranes with Super Anti-Crude Oil-Fouling Behavior and Multifunctional
Oil/Water Separation Properties
Posted on 2019-08-30 - 21:29
Owning
to its highly viscous and adhesive properties, viscous crude
oil tends to easily adhere onto separation materials, resulting in
serious fouling. Herein, we report an ampholytic nanofibrous membrane
composed of a pair of oppositely charged biopolymerspositive
chitosan (CS) and negative sodium alginate (ALG). CS and ALG were
homogeneously complexed with each other to form a well-defined, interconnected,
and entangled nanofibrous structure in a cosolvent of the LiOH/KOH/urea
aqueous system after sequential treatment with chemical and physical
cross-linking reactions. Benefitting from the coexistence of cationic
and anionic groups on the surfaces of the CS/ALG composite nanofibers,
the resulting CS/ALG composite nanofibrous membrane (CAM) has a strong
hydrate layer to repel various oils including viscous crude oil. Moreover,
The CAM could retain its wettability in harsh environments (e.g.,
acid, alkali, and salt). Furthermore, it could effectively separate
the most troublesome crude oil-in-water emulsions with a superior
separation efficiency (99%) and behaved well in terms of reusability.
Meanwhile, CAM could realize multifunctional water treatment, where
water-soluble dyes and heavy metal ions could be effectively wiped
off by CAM from oily wastewater. The superiorities in low-cost, biodegradability,
antioil fouling performance, oil/water separation properties, as well
as multifunctional water treatment endow CAM with great potential
in dealing with practical oily wastewater treatment.
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Zhou, Weikang; Fang, Yan; Li, Peiyuan; Yan, Liyu; Fan, Xianmou; Wang, Zhiguo; et al. (2019). Ampholytic Chitosan/Alginate Composite Nanofibrous
Membranes with Super Anti-Crude Oil-Fouling Behavior and Multifunctional
Oil/Water Separation Properties. ACS Publications. Collection. https://doi.org/10.1021/acssuschemeng.9b03002