One-step synthesis of super-absorbent nanocomposite hydrogel based on bentonite

Abstract

The nanoparticles of bentonite can be easily synthesized by hydrothermal treatment with microwave-assisted method. The products were characterized by XRD, FTIR, BET, SEM, EDS, and DLS. Results have revealed that the nano-bentonite was in nanometer scale with particles size of 200 - 300 nm. The SEM analysis of the nano-bentonite dispersion showed that a decrease in agglomeration and surface roughness. The nano-bentonite possessed high surface area (152.4 m2.g-1) and pore volume (0.25 cm3.g-1). Additionally, nanocomposite hydrogels (NB/PAA) were synthesized through the free-radical polymerization of acrylic acid and acrylamide (PAA) in the presence of the as-synthesized nano-bentonite (NB). The presence of NB in hydrogel matrix may improve the tensile strength of hydrogel. The tensile strength of the hydrogel increases from 0.294 to 1.609 MPa when NB content was 1.0% (NB10/PAA). Under the optimum conditions, the nanocomposite hydrogels (NB10/PAA) exhibited high water absorption capacity of 420.0 . These findings contribute to the sustainable development and green chemistry

Photodynamic Antibacterial Therapy of Gallic Acid-Derived Carbon-Based Nanoparticles (GACNPs): Synthesis, Characterization, and Hydrogel Formulation

“…By contrast, the water absorption of hydrogel patches after the loading of GACNPs was notably greater than that of blank hydrogels before loading because of the –OH functional groups on the surface of the GACNPs. The –OH group has the effect of weakening of the intermolecular force of the hydrogen bond, which caused the water molecules to permeate the GACNP-loaded hydrogel patches, as confirmed by the substantial increase in water absorption after loading [ 85 ].…”

Fabrication and swelling properties of a novel superabsorbent composite derived from waste coal gangue

“…A biodegradable superabsorbent polymer has been fabricated from zinc oxide and starch for use in plant growth. 16 Meanwhile, Le et al 17 conducted a one-step synthesis of a super-absorbent nanocomposite hydrogel based on bentonite. Furthermore, novel superabsorbent hydrogels based on starch, gellan gum, citric acid, and nanoclays have been used for crop water management, which then are used as nutrients after decomposition.…”