Biodegradable, superwettable caffeic acid/chitosan polymer coated cotton fibers for the simultaneous removal of oils, dyes, and metal ions from water

Superhydrophilic and Underwater Superoleophobic Cotton Fabric for Oil–Water Separation and Removal of Heavy-Metal Ion

“…The R value is shown in Figure 6 C, which was 89% in the first experiment and decreased by 57% in the tenth time. Meanwhile, in a similar study by Krishnamoorthi et al, 25 the water flux, oil–water separation efficiency, and heavy-metal ion removal rate were 50 050 L·m –2 ·h –1 ·bar –1 , 99, and 99%, respectively. Compared with our study, the reason for the higher water flux and heavy-metal ion removal rate of the membrane may be that it was allowed under pressure and was treated by multilayer compaction.…”

“…In general, there are a few reports on superhydrophilic and underwater superhydrophobic cotton fabric materials for simultaneous removal of heavy-metal ions and oils from wastewater. 25 Dopamine is an established mussel-inspired molecule that forms a hydrophilic surface when self-polymerized to form polydopamine (PDA) on various substrates. 25 , 26 CS can be coated on the substrate by cross-linking the amino group on it with the quinone structure in the polydopamine molecule.…”

“…Cotton fabric (CF), which is abundant in nature, easily biodegradable, and environmentally friendly, is widely used as a substrate for the preparation of oil–water separation membranes. ,, Chitosan (CS) is a natural polymeric alkaline polysaccharide with abundant sources, degradable, and eco-friendly; it contains a large number of functional groups (such as −NH 2 and −OH, etc.) that can interact with heavy-metal ions, ,, resulting in its being widely used to treat heavy-metal wastewater by adsorption. ,, Therefore, environmentally friendly membrane materials for oil–water separation and heavy-metal ion removal can be obtained by using the CS-modified CF . Krishnamoorthi et al prepared a superhydrophilic CA-CS-CF membrane by using laccase to initiate the oxidation of catechol groups in caffeic acid (CA) to generate reactive quinoids, which were subsequently cross-linked with the amino groups of CS to coat CS on CF.…”

Robust and multifunctional natural polyphenolic composites for water remediation

“…The maximum adsorption amount was enhanced to 714.29 mg g À1 , because of the higher functional group contents. 157 Besides, more natural polyphenolic composite adsorbents were also developed for other types of contaminants, such as caffeic acid-based adsorbent for dyes, antibiotics, and heavy metal ions, 94,95,158 anthocyanin-based adsorbent for iodide, 97 curcumin-based adsorbent for polychlorinated biphenyls, 159 quercetin-based adsorbent for herbicides. 96 Therefore, it could be concluded that the feasibility for complicated wastewater remediation is also one the most dominating advantages of natural polyphenolic composites in adsorption applications.…”

Facile fabrication of composite cellulose fibrous materials for efficient and consecutive dyeing wastewater treatment

“…Moreover, taking the relatively high adsorption capability (almost 91 mg g −1 ) and short equilibrium time (2 h) into consideration, the PDA@CF NWs exhibited a relatively superior comprehensive performance over a range of brous dye adsorbents (Fig. 6d and Table S2 †), [38][39][40][41][42][43][44][45][46][47] highlighting its great potential in the practical printing and dyeing wastewater treatment.…”