Synthesis, characterization and adsorption studies of an acrylic acid-grafted sodium alginate-based TiO₂ hydrogel nanocomposite

Abstract

Hydrogel nanocomposites were synthesized by solution polymerization of acrylic acid in the presence of sodium alginate biopolymer and TiO 2 nanoparticle. TiO 2 nanoparticle and N,N-methylene-bisacrylamide was used as an inorganic and organic crosslinker, respectively. The structure and morphology of the nanocomposites were investigated using X-Ray Diffraction (XRD), Fourier Transform Infra-Red Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Brunauer-EmmettTeller (BET) and thermogravimetric analysis techniques. The nanocomposites hydrogel was used for the adsorption of methyl violet dye from water. The influence of TiO 2 nanoparticle, sodium alginate content and grafting on adsorption were studied. The results showed that a pseudo-second-order adsorption kinetic was predominant in the adsorption of methyl violet onto the nanocomposite hydrogel. The experimental equilibrated adsorption capacity of the nanocomposite hydrogel agrees with Langmuir isotherm. Maximum adsorption capacity of 1156.61 mg g À1 and adsorption efficiency of 99.6% towards methyl violet were obtained for the hydrogel nanocomposite.

Recent progress in gelatin hydrogel nanocomposites for water purification and beyond

“…(iron oxide, titanium oxide), inorganic (silica, silicates), carbon nanotubes and graphene can be used with hydrogels to form hydrogel nanocomposite with improved mechanical properties and functionalities [20][21][22][23][24][25][26][27]. For example, remarkable improvements in mechanical and thermal properties were noted in hydrogel when gold nanoparticles were inserted in poly N-isopropyl amide hydrogel [28].…”

Stimuli‐Responsive Release of Antimicrobials Using Hybrid Inorganic Nanoparticle‐Associated Drug‐Delivery Systems

“…Hydrogels are water‐swollen 3D networks exhibiting viscoelastic properties governed by the characteristics of the subunits and the means and degree by which the subunits are bound . NP‐incorporated hydrogels are commonly prepared either by the direct addition of an aqueous NP dispersion to the polymer mixture before gel formation, or through the re‐hydration of a preformed dehydrated gel using a NP dispersion allowing NP diffusion into the swelling polymer matrix, with both methodologies providing entrapment of large masses of NPs . An alternative means of NP incorporation into a hydrogel is through the synthesis of particles within the network.…”

3D Bioprintability of Konjac Glucomannan Hydrogel

“…Compared to the former, natural hydrogels, e.g. gelatin [14], sodium alginate [15,16], chitosan [17] and konjac glucomannan [18], are not only rich in natural world, but also have lower toxicity, good biodegradability [19] and suitable viscosity for bio-printing [20]. Konjac glucomannan (KGM) is a natural polysaccharide consisting of β-D-glucose and β-Dmannose bound by β -1,4 glycosidic bonds at a molar ratio of 1:1.6 [21,22].…”