Utilization of gum xanthan based superporous hydrogels for the effective removal of methyl violet from aqueous solution

• Published in: International journal of biological macromolecules 2020-01, Vol.143, p.413-423
• Main Authors: Mittal, Hemant, Babu, Reshma, Alhassan, Saeed M.
• Format: Article
• Language: English
• Subjects: Adsorption; Adsorption isotherm; Methyl violet; Superporous hydrogels; Swelling kinetics
• ISSN: 0141-8130; 1879-0003
• DOI: 10.1016/j.ijbiomac.2019.11.008

[Display omitted] •Superporous hydrogels of gum xanthan with AM and AA were synthesized using gas blowing technique.•Swelling kinetics followed first-order kinetics model.•SPH successfully removed methyl violet dye from the solution.•Adsorption kinetics followed pseudo-second-order rate equation.•Adsorption isotherm followed monolayer Langmuir model with qm value of 287.54 mg·g−1. In this research work the superporous hydrogels (SPHs) of acrylic acid (AA) and acrylamide (AM) with gum xanthan (GX) were synthesized using glass blowing and foaming technique and tested the feasibility of synthesized SPHs to remove removal of methyl violet dye (MV) by the process of adsorption from aqueous solution. Swelling properties of synthesized SPHs with different concentrations of GX were studied in deionized water and the swelling kinetics followed first-order model. The adsorption of MV using SPHs was highly influenced by the solution pH. Adsorption kinetics followed non-linear pseudo-second-order rate equation, whereas, isotherm of adsorption followed monolayer Langmuir model. Diffusion mechanism of dye molecules was controlled by the combination of two mechanisms i.e. intraparticle and liquid film diffusion mechanisms. Furthermore, during desorption studies, SPHs were efficiently used for the five continuous adsorption-desorption cycles. Hence, the removal of cationic dyes could be done using SPHs of GX as effective adsorbents.