Cellulose Extraction from Corn Husk and Its Modification with Metal-Organic Framework: Applied in the Removal of Pharmaceutical Pollutants

Document Type : Research Paper

Authors

Department of Polymer Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-114, Tehran, Iran

Abstract

Hypothesis: Today, the widespread use of drugs in health care has led to their significant flow into aquatic environments, which has negative effects on the health of the environment. One of the methods used to remove drugs from water is the chemical adsorption method, which is suggested as an efficient method for removing drugs from water due to its simple operation and cost-effectiveness
Methods: Cellulose was extracted from corn husk and it was magnetized using iron oxide nanoparticles by co-precipitation method. In order to increase its specific surface area and adsorption efficiency, cellulose was modified with aluminum metal-organic framework (Cellulose@Fe3O4/Al-MOF). Magnetic cellulose adsorbent modified with metal-organic framework was used as a biosorbent to remove the drug doxorubicin from aqueous media. The chemical structure, crystallinity, morphology, particle size and other properties of the absorbent were investigated and confirmed using SEM XRD, FTIR and VSM analyses.
Findings: The parameters affecting the maximum absorption of doxorubicin including pH, initial concentration, adsorbent amount and contact time were optimized using Taguchi's statistical method and under the optimal conditions of pH of 6, initial concentration of 20 ppm, adsorbent amount of 2 g/L, time of 80 min and absorption capacity of 88%. The isotherm follows the Langmuir model, and the kinetics corresponds to the pseudo-first-order model, and the maximum absorption capacity was predicted as 96.15 mg/g according to the Langmuir model. In addition the thermodynamic study showed that the adsorption process of doxorubicin drug by magnetic cellulose modified with metal-organic framework adsorbent is spontaneous exothermic and associated with entropy reduction. The results of the adsorptiondesorption study showed that the adsorbent has very good stability, because it can be reused for 7 cycles without losing its effectiveness

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