Uncommon Sorption Mechanism of Aromatic Compounds onto Poly(Vinyl Alcohol)/Chitosan/Maleic Anhydride-β-Cyclodextrin Hydrogels

Abstract

Aromatic hydrocarbons are extensive environmental pollutants occurring in both water and air media, and their removal is a priority effort for a healthy environment. The use of adsorbents is among the several strategies used for the remediation of these compounds. In this paper, we aim the synthesis of an amphiphilic hydrogel with the potential for the simultaneous sorption of a set of monocyclic and polycyclic aromatic hydrocarbons associated with toxicity effects in humans. Thus, we start by the synthesis of a copolymer-based in chitosan and β-cyclodextrin previously functionalized with the maleic anhydride. The presence of β-cyclodextrin will confer the ability to interact with hydrophobic compounds. The resulting material is posteriorly incorporated in a cryogel of poly(vinyl alcohol) matrix. We aim to improve the amphiphilic ability of the hydrogel matrix. The obtained hydrogel was characterized by swelling water kinetics, thermogravimetric analysis, rheological measurements, and scanning electron microscopy. The sorption of aromatic hydrocarbons onto the gel is characterized by pseudo-first-order kinetics and Henry isotherm, suggesting a physisorption mechanism. The results show that the presence of maleic anhydride-β-cyclodextrin and chitosan into hydrogels leads to an increase in the removal efficiency of the aromatic compounds. Additionally, the capacity of this hydrogel for removing these pollutants from a fossil fuel sample has also been tested.

3D printing of Rg3-loaded hydrogel scaffolds: anti-inflammatory and scar-formation related collagen inhibitory effects for scar-free wound healing

“…4F showed that the storage modulus ( G ′) of both two groups was more significant than the loss modulus ( G ′′) over the entire strain range of 0.01–100%, indicating the solid-like rheological properties of the hydrogels and their ability to retain the shape after crosslinking. 27,28…”

“…4F showed that the storage modulus (G 0 ) of both two groups was more significant than the loss modulus (G 00 ) over the entire strain range of 0.01-100%, indicating the solid-like rheological properties of the hydrogels and their ability to retain the shape after crosslinking. 27,28 3.6 3D printed hydrogel scaffolds DECM hydrogel is well known for its poor mechanical properties. In this experiment, we improved the mechanical properties of DECM by increasing the concentration of the bio-ink and controlling the temperature of the printing abutment.…”

Dextrinas a Nanoesponjas: um Caminho de Êxito Trilhado pelas Ciclodextrinas

“…A versatilidade das ciclodextrinas, a sua reatividade e a facilidade em formar compostos supramoleculares em solução, conduziu ao aumento das áreas de aplicação através da sua utilização em estado sólido. As ciclodextrinas podem ser modificadas por reticulação ou por ligação covalente de moléculas de CDs a uma matriz insolúvel preexistente (por exemplo, polímeros sintéticos altamente reticulados, alginato, quitosano, nanofibras e zeólitos) [19,[50][51][52]. Polímeros à base de CDs (Figura 1b), e CDs enxertadas ou revestidas em matrizes insolúveis (Figuras 1c e 1d) têm encontrado aplicações de relevo em áreas como a remediação ambiental, biomédica e farmacêutica [53][54][55][56].…”

A Supramolecular Hydrogel Based on Copolymers of Acrylic Acid and Maleic Anhydride Derivatives with Terpyridine Motifs

“…Due to large steric hindrance, it is difficult to form the homo-polymer of maleic anhydride; however, copolymerization based on maleic anhydride is very common, and many copolymers containing maleic anhydride have been prepared and applied in scale inhibition and dispersing agents. As one of the hydrophilic monomers, maleic anhydride (MA) is often used in the preparation of hydrogels [ 26 , 27 , 28 ]. Furthermore, MA is easy to modify and functionalize for the copolymers containing maleic anhydride through the reaction of acid anhydride groups and other functional groups [ 29 , 30 , 31 ].…”