Study of Methylene Blue adsorption on keratin nanofibrous membranes.
In this work, keratin nanofibrous membranes (mean diameter of about 220nm) were prepared by electrospinning and tested as adsorbents for Methylene Blue through batch adsorption tests. The adsorption capacity of the membranes was evaluated as a function of initial dye concentration, pH, adsorbent dosage, time and temperature. The adsorption capacity increased with increasing the initial dye concentration and pH, while it decreased with increasing the adsorbent dosage and temperature, indicating an exothermic process. The adsorption results indicated that the Langmuir isotherm fitted the experimental data better than the Freundlich and Temkin isotherm models. A mean free energy evaluated through the Dubinin-Radushkevich model of about 16kJmol(-1), indicated a chemisorption process which occurred by ion exchange. The kinetic data were found to fit the pseudo-second-order model better than the pseudo-first-order model. The obtained results suggest that keratin nanofibrous membranes could be promising candidates as dye adsorption filters.
CNR-ISOF, National Research Council-Institute of Organic Synthesis and Photoreactivity, Via P. Gobetti, 101, 40129 Bologna, Italy. Electronic address: annalisa.aluigi@isof.cnr.it.
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Aluigi
CNR-ISMAC, National Research Council-Institute for Macromolecular Studies, C. so G. Pella, 16, 13900 Biella, Italy.
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Rombaldoni
CNR-ISMAC, National Research Council-Institute for Macromolecular Studies, C. so G. Pella, 16, 13900 Biella, Italy.
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Tonetti
Politecnico di Torino, Department of Materials Science and Chemical Engineering, C.so Duca degli Abruzzi 24, 10129 Torino, Italy.
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Jannoke
D000327:Adsorption; D007220:Industrial Waste; D007633:Keratins / Q000737:chemistry*; D008567:Membranes, Artificial; D008751:Methylene Blue / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D057139:Nanofibers; D010316:Particle Size; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D007220:Industrial Waste; D008567:Membranes, Artificial; D014874:Water Pollutants, Chemical; D007633:Keratins; D008751:Methylene Blue
Adsorption model; Keratin; Methylene Blue; Nanofibres