Kinetics and Adsorption Equilibrium in the Removal of Azo-Anionic Dyes by Modified Cellulose

Ángel Villabona-Ortíz, Kelly J. Figueroa-Lopez and Rodrigo Ortega-Toro
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Ángel Villabona-Ortíz: Process Design and Biomass Utilization Research Group (IDAB), Chemical Engineering Department, University of Cartagena, Avenida del Consulado St. 30, Cartagena de Indias 130015, Colombia
Kelly J. Figueroa-Lopez: Novel Materials and Nanotechnology Group, Institute of Agrochemistry and Food Technology (IATA), CSIC, Calle Catedrático Agustín Escardino Benllonch 7, 46890 Valencia, Spain
Rodrigo Ortega-Toro: Food Engineering Department, Food Packaging and Shelf Life Research Group (FP&SL) and Complex Fluids Engineering and Food Rheology Research Group (IFCRA), Universidad de Cartagena, Cartagena de Indias 130015, Colombia

Sustainability, 2022, vol. 14, issue 6, 1-19

Abstract: This study introduces a new and bio-friendly adsorbent based on natural and cetyltrimethylammonium chloride (CTAC)-modified adsorbent prepared from wheat straw residues for the removal of Congo red (CR) and tartrazine azo-anionic dyes from aqueous solution. The adsorbent was characterized by thermogravimetric analysis (TGA), calorimetric differential (DSC), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDX), and pH point of zero charge (pH PZC ) techniques. It was found that decreasing the adsorbent dose and increasing the initial concentration favors the removal of tartrazine and Congo red. Tartrazine adsorption capacities were 2.31 mg/g for the cellulose extracted from wheat residues (WC) and 18.85 mg/g for the modified wheat residue cellulose (MWC) for tartrazine as well as 18.5 mg/g for WC and 19.92 for MWC during Congo red (CR) adsorption, respectively. Increasing the initial and decreasing the adsorbent dose concentration favored the adsorption process. From time effect analysis, it was found that the equilibrium time was reached at 120 min when modified wheat cellulose was used and at 480 min when wheat cellulose was used. The kinetics of adsorption were described by pseudo-second-order in all cases with R 2 > 0.95. The obtained data equilibrium from this research was well-fitted by the Freundlich isotherm model.

Keywords: biomass; cellulose; Congo red; kinetic studies; removal; tartrazine (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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