Determination

Different sensitive and selective spectrophotometric methods for the determination of ofloxacin and dexamethasone in their binary mixture were presented. Ofloxacin was determined simply by zero order at its λmax 293.4 nm in a linear range of 1.5–12 μg mL−1 with mean percentage recovery of 100.07 ± 0.66% without any interference of dexamethasone even in low or high concentrations. Dexamethasone was determined by first derivative of ratio spectra 1DD at 266.5 nm, ratio subtraction and mean centering at 243 nm with methods in a linear range of 2.5–27.5 μg mL−1 with mean percentage recoveries of 100.09 ± 0.70%, 100.00 ± 0.72% and 99.92 ± 0.62, respectively. These methods were applied to the analysis of pharmaceutical dosage form and bulk powder where good recoveries were obtained. The proposed methods were validated according to USP guidelines

Polymer/Activated Charcoal-Coated Magnetite for the Adsorptive Removal of Emerging Contaminants: Stepwise Synthesis via Two Sequential Routes

Emerging contaminants pose great health risks to humans and living organisms, even when released at minute concentrations over prolonged exposure times. In this work, we fabricate nanocomposites based on activated charcoal-coated magnetite by incorporating the biopolymers of xylan or pectin into their structure. Two synthesis routes which differ in their sequential steps were investigated. It was demonstrated that the synthesis route affects the morphology, textural properties, and chemical structure of the nanocomposites, as confirmed by Scanning Electron Microscopy (SEM), Brunauer-Emmett-Teller (BET) analysis, and Fourier Transform Infra-red (FTIR) measurements, respectively. Hence, in turn, it influences the performance of the nanocomposites in their adsorptive removal for the emerging contaminants of Fluoxetine and Famotidine, whose presence in wastewater have been confirmed in several studies

Polymer/Activated Charcoal-Coated Magnetite for the Adsorptive Removal of Emerging Contaminants: Stepwise Synthesis via Two Sequential Routes

Emerging contaminants pose great health risks to humans and living organisms, even when released at minute concentrations over prolonged exposure times. In this work, we fabricate nanocomposites based on activated charcoal-coated magnetite by incorporating the biopolymers of xylan or pectin into their structure. Two synthesis routes which differ in their sequential steps were investigated. It was demonstrated that the synthesis route affects the morphology, textural properties, and chemical structure of the nanocomposites, as confirmed by Scanning Electron Microscopy (SEM), Brunauer-Emmett-Teller (BET) analysis, and Fourier Transform Infra-red (FTIR) measurements, respectively. Hence, in turn, it influences the performance of the nanocomposites in their adsorptive removal for the emerging contaminants of Fluoxetine and Famotidine, whose presence in wastewater have been confirmed in several studies

Multifunctional Chitosan/Xylan-Coated Magnetite Nanoparticles for the Simultaneous Adsorption of the Emerging Contaminants Pb(II), Salicylic Acid, and Congo Red Dye

In this work, we develop chitosan/xylan-coated magnetite (CsXM) nanoparticles as eco-friendly efficient adsorbents for the facile removal of contaminants from water. Characterization of CsXM using Fourier Transform Infra-Red (FTIR) Spectroscopy, Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Transmission Electron Microscopy (TEM), Zeta potential measurements, and Brunauer-Emmet-Teller (BET) analysis, confirmed the successful preparation of a chitosan/xylan complex coated over magnetite, which is characterized by being mesoporous, thermally stable and of neutral charge. Three contaminants, Pb(II), salicylic acid (SA), and congo red (CR), were chosen as representative pollutants from three major classes of contaminants of emerging concern: heavy metals, pharmaceuticals, and azo dyes. Pb(II), SA, and CR at initial concentrations of 50 ppm were removed by 64.49, 62.90, and 70.35%, respectively, on applying 6 g/L of CsXM. The contaminants were successfully removed in ternary systems, with Pb (II) and SA being more competitive in their adsorption than CR. Adsorption followed the Freundlich isotherm model and the pseudo-second order kinetic model, while the binding was suggested to occur mainly via chemical chelation for Pb(II) and physical interaction for SA and CR, which demonstrates the multifunctional potential of the nanoparticles to capture different contaminants regardless of their charge