Preparation of chitosan and carboxymethylcellulose‐based polyelectrolyte complex hydrogel via SD‐A‐SGT method and its adsorption of anionic and cationic dye

Abstract

The excellent properties of the polyelectrolyte complex hydrogels (PECHs) prepared with polysaccharides only, including polyampholyte, low toxicity, green, and clean production, have endowed them great application potentials as the adsorbents for dye‐containing wastewater treatments. In the current study, the PECH of chitosan (CTS) and carboxymethylcellulose (CMC) was prepared by semi‐dissolution acidification sol–gel transition (SD‐A‐SGT) method. The hydrogel was formed by the strong electrostatic interaction of cationic NH3+ groups of CTS and the anionic COO− groups of CMC. This simple but efficient means exhibited great potentials in constructing PECHs with uniform composition and controllable sol–gel transitions. Molecular dynamics simulation was first employed to predict the formation process and the microstructure of PECHs prepared by SD‐A‐SGT method. The structure and properties of the CTS‐CMC PECHs were also characterized by Fourier transform infrared spectroscopy, SS 13C‐NMR, scanning electron microscopy, mechanical tests, and rheological measurements, respectively. Taking the advantage of amphoteric polyelectrolyte properties, adsorption properties of anionic and cationic dyes were investigated using sunset yellow FCF and methylene blue as model dyes, respectively. The PECHs prepared in the present work had good adsorption capacity for both cationic and anionic dyes with maximum adsorption capacity of 212.83 mg/g for sunset yellow FCF and 167.35 mg/g for methylene blue. Therefore, this PECH would be a promising environmentally friendly adsorbent for the treatment of functional molecules with different charges.

Nanocomposites Assembled via Electrostatic Interactions between Cellulose Nanocrystals and a Cationic Polymer

“…The spectrum further exhibits an intense peak around 1603 cm –1 , which is indicative of the −CO stretching vibration of the sodium carboxylate groups on the surface of CNC-COONa. The spectrum of the PMETAC/CNC-COONa nanocomposite with 33 wt % of the nanofiller displays a combination of the features observed for individual components (the characteristic peaks of CNC-COONa and PMETAC at 1200–1000 and 1480 cm –1 remain unchanged), but the peak associated with the −CO stretching vibrations of CNC-COONa is shifted to 1611 cm –1 , which on the basis of results reported for other interacting components − suggests electronic interactions between PMETAC and CNC-COONa.…”

Long‐term pre‐clinical evaluation of an injectable chitosan nanocellulose hydrogel with encapsulated adipose‐derived stem cells in an ovine model for IVD regeneration

“…Chitosan/CMC solutions form a gel in vivo and are minimally cytotoxic and susceptible to changes in pH and temperature (Chen & Fan, 2008). This hydrogel is easy to produce and its fabrication is environmentally friendly (Zhao et al., 2020).…”

Facile preparation of agaraldehyde chitosan‐based composite beads as effectual adsorbent especially towards amido black

“…Among the above‐mentioned biopolymers, CHI has great interest to use as a bio‐adsorbent due to cationic, non‐toxic, biocompatible, and biodegradable polysaccharide and presence of a primary amine group 20 . It provides a strong electrostatic interaction with other anionic biopolymer/organic moiety and can be easily modified to form beads, flakes, and gels for removal of dyes molecules 13,21–23 . Beads form of CHI are proven to have superior properties towards dyes adsorption than activated carbon 24 .…”

“…20 It provides a strong electrostatic interaction with other anionic biopolymer/organic moiety and can be easily modified to form beads, flakes, and gels for removal of dyes molecules. 13,[21][22][23] Beads form of CHI are proven to have superior properties towards dyes adsorption than activated carbon. 24 The present findings encourage us to explore other biopolymers or their derivatives in this area.…”