Determination of silver(I) by flame atomic absorption spectrometry after separation/preconcentration using modified magnetite nanoparticles

AbstractA new, simple, fast and reliable method has been developed for the separation/preconcentration of trace amounts of silver ions using 2-mercaptobenzothiazole/sodium dodecyl sulfate immobilized on alumina-coated magnetite nanoparticles (MBT/SDS-ACMNPs) and their determination by flame atomic absorption spectrometry (FAAS). Optimal experimental conditions, including pH, sample volume, eluent concentration and volume, and co-existing ions, have been studied and established. Under optimal experimental conditions, the enrichment factor, detection limit, linear range and relative standard deviation (RSD) of Ag(I) ions were 250 (for 500 mL of sample solution), 0.56 ng mL−1, 2.0–100.0 ng mL−1 and 3.1% (for 5.0 μg mL−1, n=10), respectively. The presented procedure was successfully applied for determination of silver content in the different samples of water

One-step ultrasonic production of the chitosan/lactose/g-C3N4 nanocomposites with lactose as a biological capping agent: Photocatalytic activity study

In this work, the basic and applied purpose was to synthesize and modify chitosan/lactose nanocomposites with g-C3N4 structures using the ultrasonic-assisted electrospinning method. We evaluated effective photocatalytic of chitosan/lactose/g-C3N4 nanocomposites to photodegrade methyl red, methyl orange, and methyl blue in different nanophotocatalyst concentration such as 0.1�1g/L in pH 6.5. According to the experimental results, it was found that nanocomposites in different concentrations of g-C3N4 had high potential in degradation of organic compounds. The lactose structures as a green capping agent and stabilizer modified chitosan surfaces to produce uniform particle size distribution. Different lactose concentrations like 0.1�0.5wt/vol indicate a particle size range between 270 and 422 nm. The obtained as-synthesized nanomaterials were characterized by scanning electron microscope, energy-dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy, and UV�Vis spectroscopy. The crystalline size and diameter (Dc) of the nanostructures can be determined through XRD data with �90�110 nm. Results show that photocatalytic activity in low pH is more increased than other values due to more electron�hole pairs formed on the surface. © 2021 The Chemical Society Located in Taipei & Wiley-VCH Gmb

Determination of ciprofloxacin drug with molecularly imprinted polymer/co- metal organic framework nanofiber on modified glassy carbon electrode (GCE)

In this paper, we report the Co-metal organic frameworks (MOFs) were successfully synthesized with the aid of 2,6-pyridinedicarboxylic acid ammonium as an organic ligand in polylactic acid (PLA) as a biodegradable and biocompatibility polymer substrate through the ultrasonic-assisted electrospinning method. Co-MOFs/PLA nanofiber used as a new nanocomposite for design and construction of nanosensor based on the polymer prepared of the 4-aminobenzoic acid electrolytic molecule for measuring ciprofloxacin (CIP) drug class. The molecularly imprinted polymer (MIP) and non-imprinted polymer (NIP) sensors were studied by differential pulse voltammetry (DPV) to study changes in oxidation peaks and reduction of potassium ferricyanide. The calibration curve for ciprofloxacin was in the range of 0.5�150 μM also the detection limit was 0.017 μM and the standard deviation for five consecutive measurements at 60 μM concentration was calculated1.7 respectively. For characterizing the synthesized Co-MOF/PLA nanofiber we used X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersive spectroscopy (EDAX), Transmission electron microscopy (TEM) and Dynamic light scattering (DLS). In this study, we present new nanosensors with Co-MOF/PLA nanofiber as a biodegradable and bioactive composite for the first time in modified carbon paste electrode using the ultrasound-assisted direct micelle (UADM) method as the determination of ciprofloxacin drug. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature

Development of a new electrochemical sensor based on Zr-MOF/MIP for sensitive diclofenac determination

In this study, a new molecularly imprinted polymer with nanoporous material of zirconium metal-organic frameworks (Zr-MOF/MIP) for diclofenac (DFC) measurement is presented. The Zr-MOF/MIP was prepared by electropolymerization method, the Zr-MOFs were used to increase electrode surface and the DFC and para-aminobenzoic acid (pABA) were used as template and functional monomer, respectively. Zr--MOFs was characterized by using X-ray powder diffraction (XRD), scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR). The electrochemical performance was investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Sensor response was evaluated by comparing the electrochemical response of Zr-MOF/MIP, with that of non-Imprinted polymer (NIP), in a 2.0 mM potassium ferrocyanide solution containing 0.2 mM sodium sulfate as probe solution. Measurements were carried out in the potential range of-0.6 to +1.0 V with scan rate of 50 mV/s. The calibration curve of diclofenac was linear in the concentration range of 6.5 μM to 1.5�10+3 µM. Detection limit was obtained 0.1 μM and relative standard deviation of several (n=7) replicate measurements for 1.0 mM DFC concentration has obtained 1.8. Furthermore, favorable sensitivity, selectivity, good reproducibility and long-term stability, was obtained in the experiment and the proposed electrode was applied for the determination of DFC in pharmaceutical commercial sample with satisfactory results. © 2020 by CEE (Center of Excellence in Electrochemistry)