Sayed Zia Mohammadi; Elina Baniassadi; Somayeh Tajik
Abstract
In the present work, we designed a disposable voltammetric sensor utilizing a manganese ferrite nanoparticles -modified screen-printed electrode (MF/SPE) for epinine determination. The electrochemical behavior of EP at the MF/SPE was examined using differential pulse voltammetry (DPV), cyclic voltammetry ...
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In the present work, we designed a disposable voltammetric sensor utilizing a manganese ferrite nanoparticles -modified screen-printed electrode (MF/SPE) for epinine determination. The electrochemical behavior of EP at the MF/SPE was examined using differential pulse voltammetry (DPV), cyclic voltammetry (CV), and chronoamperometry techniques. The MF/SPE exhibited outstanding electro-catalytic activity for the voltammetric detection of EP. Under optimized conditions, the peak current showed a linear dependence with the concentration of EP in the range of 0.1 to 600.0 µM, and a detection limit (LOD) of 0.02 µM was determined. In addition, the MF/SPE sensor has advantages including repeatability, reproducibility, stability, inexpensiveness, and practical application. Finally, the MF/SPE -based sensor was utilized for the determination of EP in the real urine samples and the satisfactory results were obtained.
Sayed Zia Mohammadi; Sareh Torabian; Somayeh Tajik
Abstract
In the present research, an effective adsorbent as titled multiwall carbon nanotube/ZnCo- Zeolite imidazole frameworks (MWC/ZIF) was prepared and used for removal of Pb(II) ion from effluent samples. After separating the adsorbent from the solution, the amount of Pb(II) ion in the solution was measured ...
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In the present research, an effective adsorbent as titled multiwall carbon nanotube/ZnCo- Zeolite imidazole frameworks (MWC/ZIF) was prepared and used for removal of Pb(II) ion from effluent samples. After separating the adsorbent from the solution, the amount of Pb(II) ion in the solution was measured using an atomic absorption device. Based on this, various experimental parameters effective on lead removal including pH, ionic strength, time, temperature, and Pb(II) ion concentration were investigated. Various kinetic models were also studied to assess adsorption kinetics of Pb(II) ions onto surface of MWC/ZIF nanocomposite. With reference to the obtained findings, the produced nanocomposite was assumed as an effective adsorption approach for removal of Pb(II) ions from effluent samples.
Sayed Zia Mohammadi; Somayeh Tajik; Hadi Beitollahi; Zohreh Barani
Abstract
In the present study, the cysteamine electrochemical features were explored by La2O3/Co3O4 nanocomposite-modified screen printed electrode (La2O3/Co3O4/SPE) using voltammetry, chronoamperometry, and differential pulse voltammetry (DPV) techniques. The synthesized La2O3/Co3O4 nanocomposite qualities were ...
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In the present study, the cysteamine electrochemical features were explored by La2O3/Co3O4 nanocomposite-modified screen printed electrode (La2O3/Co3O4/SPE) using voltammetry, chronoamperometry, and differential pulse voltammetry (DPV) techniques. The synthesized La2O3/Co3O4 nanocomposite qualities were considered by SEM, FT-IR, and XRD analyses. Exploiting the modified SPE electrode with La2O3/Co3O4 nanocomposite, the cysteamine electrooxidation kinetics was significantly enhanced by reducing the anodic over-potential. The constructed La2O3/Co3O4/SPE revealed voltammetric reactions of high sensitivity for cysteamine, resulting in a highly appropriate means of trace levels cysteamine measurement. The electrooxidation peak currents for cysteamine were found to change linearly in relation to its concentrations (1.0–700.0 μM) in detection limit of 0.3 μM. La2O3/Co3O4/SPE was utilized for the cysteamine quantification in real specimens.
