Batch adsorption tests were done with iron(III) loaded cellulose nanocomposite bead and alizarin red S, of various concentrations, from an aqueous environment in order to examine the efficacy of metal modified bio–nanocomposite bead for removal via retention of anionic dye. The bead's spectral and surface characteristics were studied. Using response surface methods and a full factorial and central composite design, the process was optimised for variables (pH, contact time, initial dye concentration, adsorbent dosage, and temperature). At an ideal pH of 3.0, a dose of 2.0 gdm-3, and a shaking period of 45 minutes, equivalent to a dye concentration of 100 mgdm-3 at 303 K, the maximum adsorption of 97 percent was recorded. In a second order polynomial equation, the influence of the relevant variables was associated with the extent of dye adsorption. In the design space, 3D response surfaces and 2D contour plots depicted the significant variables' reciprocal interactions. The Langmuir isotherm and pseudo second order kinetics provided a better description of the adsorption. The reaction was endothermic (H°, 71.62 kJmol-1), spontaneous (-G°, 48.19 kJmol-1), and viable (S°, 0.284 Jmol-1K-1). For at least five operations, the adsorbent can be regenerated using NaOH (10.0.10-2 M) and recycled for reuse.
Author (S) Details
Mitali Sarkar
Department of Chemistry, University of Kalyani, Kalyani, India.
Dhiman Santra
Department of Chemistry, University of Kalyani, Kalyani, India.
Shanku Denrah
Department of Chemistry, University of Kalyani, Kalyani, India.
Swagatam Sarkar
Department of Chemistry, University of Kalyani, Kalyani, India.
Pankaj Sarkar
Department of Chemistry, University of Kalyani, Kalyani, India.
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