RSM-CCD optimized adsorbent for the sequestration of carcinogenic rhodamine-B: Kinetics and equilibrium studies

• Published in: Materials chemistry and physics 2017-08, Vol.196, p.270-283
• Main Authors: Sharma, Jitender, Sukriti, Anand, Prerna, Pruthi, Vaishali, Chaddha, Amritpal Singh, Bhatia, Jaspreet, Kaith, B.S.
• Format: Article
• Language: English
• Subjects: Acrylic acid; Adsorbents; Adsorption; Carcinogens; Chemical reactions; Chemical synthesis; Design optimization; Dyes; Glutaraldehyde; Gum xanthan-Psyllium; Industrial effluents; Isotherm; Kinetic models; Polymerization; Polysaccharides; Reaction kinetics; Reaction time; Response surface methodology; Rhodamine; Semi-IPN; Studies; Wastewater; Xanthan
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2017.04.042

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 RL (0.576) and R2 (0.765) values. Moreover, adsorption kinetics data fitted well with pseudo second order rate model (R2 = 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. [Display omitted] •RSM-CCD design for optimization of the adsorbent with maximum fluid efficacy.•Adsorbent was characterized using FT-IR, SEM-EDX, XRD and BET studies.•Effective removal of rhodamine-B dye (96%) was observed using the adsorbent.•Adsorption isotherm data fitted well with Langmuir isotherm model (R2 = 0.76).•Pseudo-second order model was followed for adsorption kinetics data (R2 = 0.99).