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Bezerra R.D.S.,Federal Institute of Piaui | Silva M.M.F.,Interdisciplinary Laboratory for Advanced Materials LIMAV | Morais A.I.S.,Interdisciplinary Laboratory for Advanced Materials LIMAV | Santos M.R.M.C.,Interdisciplinary Laboratory for Advanced Materials LIMAV | And 2 more authors.
Journal of Environmental Chemical Engineering | Year: 2014

The natural biopolymer cellulose has been successfully used as sorbent due to its biocompatibility, degradability and chemical variability. For this application the pristine biomaterial was characterized through X-ray diffraction, infrared spectroscopy, scanning electron microscopy and carbon nuclear magnetic resonance. These results confirmed the biopolymer crystallinity. Its ability for ranitidine drug removal from aqueous solution was evaluated, investigating the effect of time, concentration, pH and temperature, to give favorable results in alkaline conditions. From the kinetic point of view, the sorptive process followed the pseudo-second-order model. The maximum sorption capacity gave 28.1; 32.1 and 32.9 mg g-1 at 298 ± 1; 308 ± 1 and 318 ± 1 K, respectively, after adjusting the data to the Freundlich model. The experimental data are in agreement that natural cellulose is a promising biopolymer to remove this drug from the environment. © 2013 Elsevier Ltd. Source


Bezerra R.D.S.,Federal Institute of Education | Morais A.I.S.,Interdisciplinary Laboratory for Advanced Materials LIMAV | Osajima J.A.,Interdisciplinary Laboratory for Advanced Materials LIMAV | Nunes L.C.C.,Interdisciplinary Laboratory for Advanced Materials LIMAV | Silva Filho E.C.,Interdisciplinary Laboratory for Advanced Materials LIMAV
International Journal of Biological Macromolecules | Year: 2016

In the last years has increased the study about the using of natural biopolymers and theirs derivatives in the removal (adsorption/incorporation) of contaminats of medium aqueous, and theirs utilization in the desorption (release) de drugs. However, there not in the literature studies about the utilization of the cellulose and cellulose phosphate in the adsorption (incorporation)/desorption (release) of the drug amitriptyline (AMI). Therefore, in this study was accomplished the synthesized of the phosphated cellulose (PC) through the reaction of pure cellulose (C) with sodium trimetaphosphate (P) under-reflux, for 4 h and at 393 K. The efficiency of the reaction was observed by XRD, TG/DTG, 31P NMR and EDS. The adsorption study for the AMI in aqueous medium was carried out by varying the time, pH, concentration, temperature and ionic strength. The results showed that the PC showed a greater adsorption capacity of AMI than pure cellulose, presenting an increase of about 102.72% in the adsorption capacity of the drug by cellulose after the phosphating reaction. In desorption of drug from the surface of biomaterials was performed by varying the pH and time, where it was observed that PC showed a maximum release of 40.98% ± 0.31% at pH 7. © 2016 Elsevier B.V. Source

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