Premium
Recycling of reactive dye using semi‐interpenetrating polymer network from sodium alginate and isopropyl acrylamide
Author(s) -
Dhanapal V.,
Subramanian K.
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41436
Subject(s) - acrylamide , polymer science , polymer , isopropyl , chemistry , polymer chemistry , chemical engineering , organic chemistry , monomer , engineering
A sequence of semi-interpenetrating polymer network (semi-IPN) were synthesized by free radical photo copolymerizing acrylic acid and isopropyl acrylamide (NIPAAm) in aqueous sodium alginate (NaAlg). Their structures (FT-IR), thermal stability (TG/DTG), morphology (SEM), mechanical properties, reactive blue 4 (RB 4) dye adsorption (624 mg/g) and its dying characteris- tics, reusability of dye and adsorbent were evaluated. TG thermograms of semi-IPN in air revealed zero order kinetics for initial step thermal degradation with an activation energy of 68.68 kJ/mol. Dye adsorption showed best fit for Langmuir adsorption isotherm and the kinetics followed pseudo-second-order model. The water and dye diffusion kinetics followed non-Fickian mechanism. The changes in thermodynamic parameters namely Gibbs free energy (DG ), entropy (DS ) and enthalpy (DH ) indicated that the adsorp- tion was spontaneous and exothermic process for RB 4/semi-IPN system. V C 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40968.