Modelling and Optimization of Indigo Carmine Adsorption onto P(NIPAM-co-AN)/Clay Composite Using Response Surface Methodology

Abstract

In the present work, a new polymeric adsorbent; Poly(NIPAM-co-AN)/clay composite was prepared via in-situ polymerization. The copolymerization of N-isopropylacrylamide, acrylonitrile and calculated clay (about 5% w/w) were carried out at 65°C in the presence of 10 mL 1,4-dioxane using AIBN as an initiator. Characterization of P(NIPAM-co-AN)/clay composite was determined by FT-IR techniques. NIPAM-AN/clay composite has been used as a novel adsorbent to remove indigo carmine dye from synthetic effluents. Three important process parameters i.e., initial IC concentration (5-30 mg/L), adsorbent dosage (0.01-0.08 g) and contact time (10–180 min) were modeled and optimized to get the best response of indigo carmine removal using a Central Composite Design assembled with Response Surface Methodology. The amount of indigo carmine in the solution was measured using a UV-visible spectrophotometer at a wavelength of 650 nm. Based on the ANOVA statistical value, the adsorption of indigo carmine onto P(NIPAM-co-AN)/clay composite is highly significant, with very low probability value (p