A green route to prepare fluorescent and absorbent nano-hybrid hydrogel for water detection

Abstract

An environment-friendly fluorescent nano-hybrid hydrogel has been synthesized successfully, from cellulose nanocrystal (CNC), acrylic acid (AA) and phosphorescent Eu2+/Dy3+ doped SrAl2O4 via free radical polymerization. The hydrogel network matrix fixed Eu2+/Dy3+ doped SrAl2O4 nanoparticles by polymer chains with coordinate bonds that prevented particles from aggregating and quenching in water. The fluorescent nano-hybrid hydrogel exhibited extremely high water absorption of which the swelling ratio in distilled water and NaCl salt solution were respectively of 323.35 g/g and 32.65 g/g. Furthermore, the hydrogel displayed excellent water retention property that can keep half of the moisture even exposed to 80 °C for 210 min. Besides, the hydrogel had bright green fluorescence under the sunlight or ultraviolet excitation, and the fluorescence intensity was up to 125477 after swelling 50 times in water. The time-resolved photoluminescence (TRPL) afterglow decay examination showed that the fluorescent emission persisted for 4 h after hydrogels excited at 368 nm wavelength UV-light for 10 min. The fluorescence intensity behaved significant linear relationship with the swelling ratio. As a result, these hydrogels were considered as promising candidates for the preparation of stable and sensitive sensor materials in green water detection.

Recent advances and an industrial perspective of cellulose nanocrystal functionalization through polymer grafting

“…KPS has been used to graft hydrophilic polymers such as poly(acrylamide) [73][74][75], poly(acrylic acid) [76,77], poly(methacrylic acid-co-ethylene sulfonic acid) [78], the hydrogen bonding moiety 2-ureido-4[1H]-pyrimidone [79], and recently hydrophobic poly(styrene) (PS) [80] from CNCs.…”

Nanostructured Functional Hydrogels as an Emerging Platform for Advanced Energy Technologies

“…It combines the high electrical conductivity of PPy hydrogel, the high thermoresponsive sensitivity of PNIPAM, and the good mechanical properties of the double network . By hybridizing materials, nanostructured hydrogels with novel features can play a significant role in smart energy‐storage and conversion devices.…”

“…The swelling behavior of hydrogels endows them with high hydrophilicity, preventing the leakage and inactivation of surface‐loaded species. Their surface properties can be further tailored by incorporating with other functional groups and materials …”

Vanadium Phosphorus Oxide/Siliceous Mesostructured Cellular Foams: efficient and selective for sustainable acrylic acid production via condensation route

“…Acrylic acid (AA) together with methyl acrylate (MA) were widely applied for producing adhesives, plastics, PAN fibers, hydrogel, biomimetic materials, coatings etc. 1–3 . At present, the traditional way to make AA involves successive oxidation of propylene 4–9 .…”