Preparation and Characterization of Sodium Alginate-Based Oxidized Multi-Walled Carbon Nanotubes Hydrogel Nanocomposite and its Adsorption Behaviour for Methylene Blue Dye

Abstract

Herein, a sodium alginate/poly (acrylic acid)/oxidized-multi-walled carbon nanotubes hydrogel nanocomposite (SA/p(AAc)/o-MWCNTs HNC) was synthesized by in situ free-radical polymerization method. The synthesized SA/p(AAc)/o-MWCNTs HNC was used to remove methylene blue (MB) from aqueous solution. The synthesized HNC was confirmed by employing various characterization techniques. The SA/p(AAc)/o-MWCNTs HNC exhibited a maximum swelling capacity of 2265.4% at pH 8.0. The influence of vital parameters in the sorption process including the initial pH, adsorption dose, contact time and concentration were systematically examined on a batch mode. Subsequently, adsorption kinetics as well as isotherm models were applied to assess the nature and mechanism of the adsorption process. Adsorption kinetics were best described by pseudo-second-order model, while the Langmuir isotherm model governed the adsorption isotherm. The SA/p(AAc)/o-MWCNTs HNC exhibited a maximum adsorption capacity of 1596.0 mg/g at 25°C. This adsorbent showed excellent MB uptake and good regeneration ability.

Chitosan- and Alginate-Based Hydrogels for the Adsorption of Anionic and Cationic Dyes from Water

“…The FTIR spectra of PAA/alginate presented in Figure 5 were analyzed by comparing the difference between spectra obtained from samples with different amounts of alginate [39]. When no sodium alginate is present and the hydrogel sample is only composed of cross-linked PAA, the peaks representing cross-linked PAA are in the absorption range of 1350 to 1850 cm −1 .…”

Review on Recent Developments in Bioinspired-Materials for Sustainable Energy and Environmental Applications

“…The production of hydrogel by sodium alginate and its activation by polyethyleneimine for elimination of methylene blue dye from effluent was observed by Godiya et al [176]. The free radical polymerization method was used in production of sodium alginate/poly acrylic acid/ multi-walled carbon hydrogel nanocomposite which showed 2265% methylene blue sorption ability observed by nanohybrid construct at pH 8 [177]. The development of a nanocomposite by magnetic multi0walled carbon nanotubes-loaded alginate for dyes removal from the textile effluent was reported by Azari et al [178].…”

Oxidized multiwalled carbon nanotube reinforced rheological examination on Gum ghatti‐cl‐poly(acrylic acid) hydrogels

“…In the case of the GGAACNT-1 hydrogel, the actual peaks for -o-MWCNTs were not seen, implying that the signals were superimposed by GGAACNT-0 signals owing to a certain frequency of association between -o-MWCNTs chains and GGAACNT-0 chains. 40,49 4.2 | XRD study The XRD spectra of GG show a typical amorphous nature, 50,51 with a distinctive peak at 2θ = 18.34 (Figure 2b). The XRD pattern of the Gum ghatti-cl-poly (acrylic acid) hydrogel is comparable to that of the Gum ghatti-cl-poly(acrylic acid)/-o-MWCNT hydrogel.…”