This work aimed to compare the stability, service lifetime, and electrooxidation performance of Ti/Ta 2 O 5 /Pt-RuO 2 -IrO 2 (PRI) and Ti/Ta 2 O 5 /Pt (Pt) electrodes thermally prepared. The service lifetime study performed under 410 mA/cm 2 in a 9N H 2 SO 4 showed that PRI electrode had six (06) times longer lifetime than the Pt electrode. Bulk electrolysis experiments were carried out on Pt and PRI under 20 mA/cm 2 . COD removal, current efficiency (CE), specific energy consumption (SEC), electrical energy cost, and anode efficiency (η) were estimated. Both electrodes lead to the conversion of the parent compounds. However, the Pt electrode was best suited for amoxicillin (AMX) electrooxidation with 36.89% by COD removal in KClO 4 0.1 M. Besides, the PRI electrode provided the best performances for the AMX electrooxidation (8.15%) and telebrix (TLX) (29.28%) in HClO 4 0.1 M and KClO 4 0.1 M, respectively. The presence of NaCl enhanced significantly the organic compound electrooxidation in terms of COD removal, CE, SEC, electrical energy cost, and η on the both electrodes. This is probably because of the co-action of direct and indirect (by active chlorine) oxidations. But the PRI electrode presented the best performance in the presence of chloride ions. In summary, the experimental conditions can determine the performance of an anode.
The objective of this work was to valorize the clays of Côte d'Ivoire in the treatment of wastewater. The study focused on the ability of raw clays from Bouaflé city to adsorb methylene blue and cadmium ions, in aqueous solution. The physicochemical characteristics of the clay were determined using the measurement of its specific surface area, chemical analysis and mineralogical analysis. It emerges from these characterizations that clay is essentially composed of type 2/1 minerals such as illite (32.94%), type 1/1 kaolinite (8.47%), quartz (40.23 %) and approximately iron oxy-hydroxides (18.36%). Its specific surface is 37.58 m2 / g. The kinetics, thermodynamics and isotherms of adsorption have been used to understand the mechanism of adsorption. The results obtained show that the organic pollutant alone in solution (methylene blue (MB)) is adsorbed quite quickly. We obtained a decoloration yield greater than 90% after 40 min of adsorbate-adsorbent contact. The elimination of methylene blue is greater in a basic medium. The BM adsorption kinetics were modeled. The comparison of the correlation factors of the different kinetic models used has shown that the adsorption kinetics of the organic pollutant (MB) better match the pseudo second order kinetic model. Thermodynamics predicted a spontaneous endothermic surface reaction, due to the positive sign of and the negative sign of , obtained ( = 31.398; = -12.635). Analysis of adsorption isotherms allowed us to show that the adsorption of methylene blue on clay is physisorption type and in monolayer. The experiments were also performed with an aqueous solution containing both methylene blue and cadmium ions. After a contact time of 120 min, 60% of the cadmium ions are adsorbed on the clay against only 20% of methylene blue. Thus, clay preferentially eliminates trace metal elements (Cd2+) compared to organic pollutants (methylene blue).
Inhibitive properties of 7-(ethylthiobenzimidazolyl) theophylline (7-ETBT) molecule for the corrosion of alu-minum (Al) in one molar hydrochloric acid medium have been investigated using mass loss and Tafel polariza-tion methods. The results suggest spontaneous and predominant physical adsorption of 7-ETBT on the metal surface which obeys Langmuir isotherm model. The studied inhibitor showed excellent inhibition efficiency up to 94.07 % at 298 K for its optimum concentration (2 mM). Moreover, Tafel polarization method revealed that 7-ETBT is a cathodic-type inhibitor. Further investigation on the morphology using scanning electron microscopy (SEM) has confirmed the existence of a protective film of inhibitor molecules on aluminum surface. Theoreti-cal approach for the performance of 7-ETBT as Al corrosion inhibitor is also done using Density Functional Theory (DFT) level with B3LYP exchange correlation functional for 6-31G (d, p) basis set. The results provided by this theoretical study are consistent with the experimental data. All the results have shown an evidence of the effectiveness of the inhibitive effect of 7-ETBT on Al.
This work aimed to synthesis a novel material that would be able to efficiently remove both organic and microbiological pollutants from wastewater. Through the hydrothermal process, we first doped titanium dioxide, a semiconductor possessing excellent photocatalytic properties with silver nanoparticles having good antibacterial properties. The obtained material was then associated with clay known for its good adsorbent properties to form [Ag-TiO 2 ]:[clay] type nanocomposites.
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