Materials Chemistry and Physics, Vol.196, 270-283, 2017
RSM-CCD optimized adsorbent for the sequestration of carcinogenic rhodamine-B: Kinetics and equilibrium studies
The semi-IPN based on Psyllium-Gum xanthan hybrid backbone was synthesized using free-radical polymerization technique which was used for the sequestration of rhodamine-B dye from waste water. Response surface methodology (RSM) and Central composite design (CCD) was employed to optimize the synthesized semi-IPN with respect to maximum liquid uptake efficacy. The maximum (470.8%) liquid uptake efficacy was achieved under different optimized reaction parameters such as APS (0.029 mol L-1); glutaraldehyde (0.058 mol L-1); solvent (6.0 mL); acrylic acid (11.960 mol L-1); pH (6.5); reaction time (65 s) and microwave power (100%). XRD, SEM-EDX, FT-IR, UV-VIS and BET were used to characterize the candidate polymer. Maximum adsorption of rhodamine-B (96%) was achieved after 12 h at 500 mg semi-IPN dose, 6 mg L-1 initial dye concentration and 303 K temperature. Adsorption data fitted will with Langmuir adsorption isotherm with favourable R-L (0.576) and R-2 (0.765) values. Moreover, adsorption kinetics data fitted well with pseudo second order rate model (R-2 = 0.99). Adsorption and kinetic behavior demonstrated the synthesized semi-IPN based on natural polysaccharides was found to be effective for the treatment of textile industrial effluents. (C) 2017 Elsevier B.V. All rights reserved.