A study on adsorption behavior of newly synthesized banana pseudo-stem derived superabsorbent hydrogels for cationic and anionic dye removal from effluents

Kabiru Bello; Balladka Kunhanna Sarojini; Badiadka Narayana; Anjali Rao; Kullaiah Byrappa

doi:10.1016/j.carbpol.2017.11.106

A study on adsorption behavior of newly synthesized banana pseudo-stem derived superabsorbent hydrogels for cationic and anionic dye removal from effluents

Carbohydr Polym. 2018 Feb 1:181:605-615. doi: 10.1016/j.carbpol.2017.11.106. Epub 2017 Dec 2.

Authors

Kabiru Bello¹, Balladka Kunhanna Sarojini², Badiadka Narayana³, Anjali Rao⁴, Kullaiah Byrappa⁵

Affiliations

¹ Department of Industrial Chemistry, Mangalore University, Mangalagangothri, 574 199, Karnataka, India.
² Department of Industrial Chemistry, Mangalore University, Mangalagangothri, 574 199, Karnataka, India. Electronic address: bksaroj35@gmail.com.
³ Department of Studies in Chemistry, Mangalore University, Mangalagangothri, 574 199, Karnataka, India.
⁴ M.Sc.Course in Biochemistry, Mangalore University, Mangalagangothri, 574 199, Karnataka State, India.
⁵ Department of Studies in Materials Science, Mangalore University, Mangalagangothri, 574 199, Karnataka, India.

PMID: 29254013
DOI: 10.1016/j.carbpol.2017.11.106

Abstract

In this work, an environmentally benign superabsorbent hydrogel based on banana pseudo-stem has been synthesized by free radical graft co-polymerization of sodium acrylate (NaAc) and acrylamide (AM) on to modified banana pseudo-stem cellulose backbone using ammonium persulfate (APS) and N,N-methylene-bis-acrylamide (MBA) as initiator and crosslinker respectively.The optimum condition for initiator, monomers and crosslinker concentrations was found to be 0.0032molL^-1, 0.013molL^-1 and 0.00048molL^-1 respectively. Structural confirmation of the hydrogel prepared is performed by FT-IR spectroscopy whereas the morphology and thermal properties assessments were performed by SEM and TGA analysis respectively. Swelling behavior in solutions with different pH (2, 4, 7, 9 and 12) and contact time (5-750min) indicated 323.54gg^-1 in pH 7 solutions for 570min. The optimized hydrogel was used as adsorbent for methylene blue (MB) and methyl orange (MO) with a maximum adsorption of 333.3 and 124 mgg^-1 respectively. Kinetics and Isotherm adsorption studies revealed pseudo second-order and Freundlich isotherm as befitting models.

Keywords: Banana pseudo-stem; Hydrogel; Methyl orange; Methylene blue.