1-furoyl-3,3-diethylthiourea was used as a novel neutral carrier in ion selective electrode for copper II detection and determination. The Cu 2+ selective plasticized polyvinyl chloride (PVC) membrane electrode exhibited reversible potential responses with Nernstian slope of 29.34± 0.6 mV/decade for Cu 2+ ions in the concentration range from 1.0×10 −7 to 1.0×10 −2 mol/dm 3 with a practical detection limit (PDL) of 3.84x10-7 and lower limit of linear response (LLLR) of 6.15x10-7 mol/dm 3 and a lifetime of 20 days. The response time, pH effect and other characteristics of the electrodes were also studied.
Chloride selective polymeric liquid membrane electrode has been developed by using Bis-(2-ethylhexyl) Sebacate (DOS) as plasticizer and 2-[5-(4-nitrophenyl) furyl]-4,5-diphenyl imidazole (FFDFIN) as ionophore. Some parameters of evaluation of the electrode are presented in this work. The constructed electrode showed fast potentiometric response to chloride ion in the concentration range from 10-6 to 10-2 mol.dm-3 with Nernstian slope of-63.43 ± 0.85 mV/decade, response time of 25 seconds and life time of 15 days.
Fe-TiO2/AC and Co-TiO2/AC composites were prepared from activated carbon (AC) derived from residues of peanut hulls and TiO2 photocatalyst, electrochemically prepared from titanium scrap, and doped with Fe and Co, respectively. The adsorption capacity and photocatalytic activity of the Fe-TiO2/AC and Co-TiO2/AC composites were studied for removing and degrading Cibacron Yellow F-4G (CYF-4G) from wastewater. Doped ACs were characterized by thermogravimetric (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), a new X-ray absorption technique (XRA), and elemental analysis (EA). Interesting relationships were found between SEM, XRA, and TGA data and the doped amount of catalyst on ACs. Optimal dye adsorption was found at a pH of 2.0. The CYF-4G adsorption kinetics are followed according to the pseudo-second order model. The experimental data revealed that the Langmuir model fit better than the Freundlich and Temkin models. A decrease in adsorption capacity was observed when the catalyst dope percentage increased. A removal and degradation efficiency of the dye close to 100% was achieved around 120 min. A synergistic adsorption and photocatalytic degradation effect of the Fe-TiO2/AC and Co-TiO2/AC composites could be observed when adsorption experiments were conducted under simulated visible radiation.
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