Adsorption of methyl violet from aqueous solution using gum xanthan/Fe3O4 based nanocomposite hydrogel

• Published in: International journal of biological macromolecules 2016-08, Vol.89, p.1-11
• Main Authors: Mittal, H., Kumar, Vaneet, Saruchi, Ray, Suprakas Sinha
• Format: Article
• Language: English
• Subjects: Adsorption; Diffusion; Ferric Compounds - chemistry; Gentian Violet - isolation & purification; Gum xanthan; Hydrogel, Polyethylene Glycol Dimethacrylate - chemical synthesis; Hydrogel, Polyethylene Glycol Dimethacrylate - chemistry; Hydrogen-Ion Concentration; Isotherms; Kinetics; Methyl violet; Models, Theoretical; Nanocomposite hydrogel; Nanocomposites - chemistry; Nanocomposites - ultrastructure; Polysaccharides, Bacterial - chemistry; Solutions; Spectroscopy, Fourier Transform Infrared; Temperature; X-Ray Diffraction
• ISSN: 0141-8130; 1879-0003
• DOI: 10.1016/j.ijbiomac.2016.04.050

•Hydrogel nanocomposites of Gx-cl-PAA with Fe3O4 nanoparticles were synthesized.•Hydrogel nanocomposite showed excellent MV adsorption capacity of 642mg/g.•Adsorption process followed Langmuir adsorption isotherm and pseudo-second-order kinetics model.•The nanocomposite showed very good recyclability. This research paper reports the utilization of gum xanthan-grafted-polyacrylic acid and Fe3O4 magnetic nanoparticles based nanocomposite hydrogel (NCH) for the highly effective adsorption of methyl violet (MV) from aqueous solution. Synthesized NCH was characterized using various techniques, such as FTIR, XRD, SEM-EDS, TEM and BET. Adsorption behavior of NCH was studied for the adsorption of MV and it was found to remove 99% dye from the solution. Adsorption process followed Langmuir isotherm model (qe=642mg/g) and pseudo-second-order kinetics model. Thermodynamic studies suggested that the adsorption process was endothermic and spontaneous. Moreover, the adsorbent was successfully utilized for successive five cycles of adsorption-desorption.