ABSTRACT
In the present study, the magnetic nanocomposite is fabricated using chitosan, thiobarbituric acid, malondialdehyde and Fe3O4 nanoparticles (CTM@Fe3O4). The fabricated nanocomposite (CTM@Fe3O4) is characterized using FTIR, TGA, BET, XRD, Raman, XPS, FESEM, and HRTEM techniques. The results of BET analysis confirmed that the nanocomposite has a mesoporous structure with high surface area of 376 m2 g-1 and high pore volume 0.3828 cm3 g-1. The adsorption of tetracycline (TC) onto CTM@Fe3O4 adsorbent is carried out using batch technique by changing several factors such as pH, concentration, contact time, and temperature. Langmuir and pseudo-second-order nonlinear models were found to be the best-fit models to predict isotherms and kinetics of adsorption, respectively. The highest adsorption capacity of 215.31mg/g was achieved at the optimum conditions of 0.05g adsorbent dosage, 60mg/L TC concentration. Overall, results demonstrated that CTM@Fe3O4 nanocomposite was an excellent adsorbent material with superparamagnetic properties, which allowed the separation as well as recovery of the adsorbent from aqueous solution using external magnet for effective industrial applications.
Subject(s)
Chitosan/chemistry , Magnetic Phenomena , Nanocomposites/chemistry , Tetracycline/isolation & purification , Adsorption , Ferric Compounds/chemistry , Hydrogen-Ion Concentration , Kinetics , Malondialdehyde/chemistry , Nitrogen/chemistry , Photoelectron Spectroscopy , Spectroscopy, Fourier Transform Infrared , Spectrum Analysis, Raman , Thermodynamics , Thiobarbituric Acid Reactive Substances/chemistry , Time Factors , X-Ray DiffractionABSTRACT
N/S-doped carbon supported AgNPs has been synthesized at low-cost, and scalable method using silver complex of chitosan based polymer. The fabricated nanocomposites exhibited excellent electrocatalytic performance as a glucose sensor. Remarkably, the fabricated glucose sensor is exhibited an ultrahigh sensitivity of 35.22 mAmM-1 cm-2 with a very low detection limit (0.046 mM) and long-term durability (30 days). Under optimized conditions, a wide linear response was obtained from 5 µM to 3 mM with an excellent linear response (R2 = 0.9940) was also obtained by AgNPs/NSC modified electrode. The presence of the heteroatom and AgNPs into the carbon matrix greatly enhances the selectivity for glucose over potential interferences in aqueous solution, with interfering agents. Overall, the present methodology demonstrates an efficient, robust, and aqueous-media-tolerable nanocomposite material as an electrochemical sensor and a potential alternative tool for the detection of glucose.
