Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 124, Issue -, Pages 331-345Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2018.11.213
Keywords
Blended; RSM-CCD; Removal
Funding
- MHRD
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Gum acacia and sodium alginate were blended to synthesize highly efficient superadsorbent formed by grafting of poly(acrylic acid) (AA) used as monomer onto the hybrid of gum acacia and sodium alginate and the polymeric chains were crosslinked through N,N'-methylene bisacrylamide (MBA). The overall reaction followed free radical polymerization with ammonium persulphate (APS) used as initiator. Response surface methodology integrated with central composite design (RSM-CCD) could synthesize semi-Interpenetrating network (semi-IPN) having maximum swelling capacity of 1749.2% at MBA, APS and AA concentrations of 0.89 x 10(-2) mol L-1, 3.29 x 10(-2) mol L-1 and 1.46 mol L-1, respectively using 15 mL water at 70 degrees C for 2.5 h. The synthesized sample was found to be selective for removal of cationic dyes upto 97.49%, 95.39% and 94.56% for auramine-O (AO), malachite green (MG) and crystal violet (CV), respectively. Adsorption capacities at equilibrium were calculated experimentally as 2.01 mg g(-1), 3.06 mg g(-1) and 7.55 mg g(-1) for AO, MG and CV, respectively. These dyes could be desorbed with 0.1 N HCI for the recyclization of semi-IPN. Adsorption mechanism involved monolayer formation with three step process of adsorption and followed first order kinetics. Exothermic nature of adsorption was revealed by thermodynamic studies. (C) 2018 Elsevier B.V. All rights reserved.
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