Terephthalaldehyde as a good crosslinking agent in crosslinked chitosan hydrogel for the selective removal of anionic dyes

Abstract

This work reports the selectivity and good adsorption performance for the removal of anionic dyes using an ultrasonic-synthesized terephthalaldehyde crosslinked chitosan hydrogel.

Tracking the concentration of Al3+ in the aqueous system up to the nanomolar range using a modified biopolymer chitosan based fluorophore

“…The PXRD spectra of chitosan 24 (Fig. 4a) reflect the semi-crystalline nature with signature peaks at 10.3° and 20.2°, whereas the PXRD spectra of β-naphthol and β-NAC (Fig.…”

Development of an azo functionalized oligomeric chitosan sensor for rapid visual, spectrophotometric and spectrofluorometric detection of KMnO4 up to micromolar concentrations

“…A chitosan solution (2.5% w/v) was prepared in 3% acetic acid and then stirred magnetically for 2 hours. 22 Then the diazotisation reaction was carried out by mixing the chitosan solution with hydrochloric acid (7.45 M) and sodium nitrite (5% w/v) in a 4 : 2 : 1 ratio while stirring was continued to maintain the temperature of the reaction in the range of 0–5 °C. The coupling of the diazonium salt of chitosan was performed using β-naphthol (10% w/v), which was prepared by dissolving β-naphthol in 10% sodium hydroxide solution at 0 °C and the reaction mixture was stirred continuously for 10–20 minutes.…”

Recent Advances on Designs and Applications of Hydrogel Adhesives

“…[66] In addition to a grafted aldehyde to the backbone, the extra addition of dialdehyde to hydrogel not only benefited in accelerating the gel process but contributed significantly to enhance adhesion toughness via in situ Schiff's reaction. [67][68][69] Likewise, in situ gelation hydrogels prepared via Michael-type addition have also received much attention, carried out under mild base. This reaction occurs between nucleophiles (i.e., thiols, amines, water) and the double bonds (Figure 6c).…”