Portugaliae
Electrochimica Acta

One of the most frequently produced agricultural wastes is biomass from which Lc is obtained. It contains a high concentration of Ln, Cs and Hcs. It is one of the main sources of energy in the globe, but is underutilized. To extract Ln from plants using acid pretreatment and alkali, the current research employed a Bm resource that is easily accessible. Ln was extracted from four different Bm: AS, BTB, NTB and WS. The proximate and final analyses were utilized to describe Ln after the pretreatment procedure. NTB had the lowest S content. Analysis of TGA test for Bm from Lc was performed. BTB had the highest projected Ct of Ln recovery, at 100 ºC. NTB produced a minimum Ln amount of 6%, compared to 8% yield from BTB, after 5 h. Ln yield at 160 ºC was lower. WS and AS had the same Ln yield (7%), after 5 h. The extracted Ln, which has a higher phenolic content than that from the commercial one, can be used in future applications. Keywords: Bm from Lcs; Cs; environmentally friendly; green biotechnology; renewable resource; TGA.

EC is an emerging technique used for various applications, due to its benefits, such as coagulation, flocculation and Ec treatment. Emerging pollutants are a real concern, and many researchers have focused on their removal, using EC, due to its several advantages, such as easiness of operation, less space requirements, versatile pollutants removal, lower sludge production, cost effectiveness, lower energy consumption and environment friendliness. Literature has also determined that EC technology is a proven efficient technology for treating various nature industrial effluents. However, those emerging pollutants, such as pesticides, Polyfluoroalkyl substances, cyproflyxin, amoxicillin and surfactants are not efficiently treated by simple EC technology, and their separation is not the solution, since they require degradation and safe disposal. Therefore, waste disposal from this process is a major concern, and the choice of advanced EC-degradation technology depends upon the nature and strength of the pollutant. To address these issues, various processes coupled with EC have been used, such as EF, PDS, EO, ozonation, photochemical degradation, PC, aeration and sonication. Thus, this paper focuses on the basics of EC technology, several degradation systems and application of combined degradation-EC technologies, for treating various WW. Keywords: di-sulfate oxidation; Fenton process; ozonation; PC; per-sulfate.

DAD was investigated as CI for SS corrosion in a 3.5% NaCl solution, using WL, thermometric and RSM techniques. The analyses results show that IE(%) of DAD was dependent on its Ct and T. The highest IE(%) values were recorded on 5.0 g/L, at 303 K, by thermometric and WL methods (90.0 and 98%, respectively). DAD adsorption onto the SS surface was found to be spontaneous, obeyed Langmuir’s isotherm, and its mechanism appeared to be partly physical, partly chemical. The results of RSM techniques supported experimental data. Finally, SEM was used to examine SS surfaces morphology without and with DAD, and its results confirmed the CI process. Keywords: adsorption; corrosion; DAD; NaCl; RSM; SEM; SS; WL.

In this study, to determine chemical elements and stable isotopes in 30 GW samples collected from SS Moroccan L-D region, various analytical techniques were used. Thus, the goal was to identify and understand different geochemical processes contributing to water mineralization in the study area. In fact, statistical results for major cations and anions indicated that they obeyed the following trend: Na+ > Ca2+ > Mg2+ > K+, and Cl- > SO42- > HCO3- > NO3-, respectively. Additionally, it was found that water EC values varied from 1290 to 6895 µs/cm. Indeed, pH values of investigated GW was from 6.88 to 7.75. Studied GW had HG facies with 86.66% Na-Cl and 13.33% Ca-SO4. This finding is explained by the dissolution of evaporative formations that characterizes Saharan sections. Additionally, ionic ratios analysis revealed that GW chemical evolution was influenced by processes such as rock weathering, mineral compounds dissolution and evaporation. Therefore, a better relationship between Ca and SO4 suggested gypsum and anhydrite leaching. It was found that stable isotopes (δ18O and δ2H) values differed from -6.96 to -8.93‰ and from -51.5 to 65.56‰, respectively. These findings strongly suggest that waters in the region undergo significant evaporation before reaching the aquifer. In addition, the aquifer's recharge height was also predicted to be no higher than 300 m, with a latitudinal gradient of δ18O, including 0.52 per 100 m. These results can serve as valuable guidance for decision makers in optimizing exploitation and assessment processes in Moroccan SS area. Keywords: AAS; GW; HG; mineralization; Moroccan SS; stable isotopic.

In this study, a composite material containing PY and CTS, as functional material, and dopamine, as template, was electrodeposited onto a GCE surface modified with NP from TiO2. The prepared MIP sensor was characterized by CV, SEM, FTIR and UV-vis techniques. The developed MIP matrix was used for dopamine detection, using DPV method. Diverse analytical parameters were optimized, such as: monomer, template, SE concentrations, electropolymerization cycles, pH medium, incubation time and scan rate. In the best conditions, the sensor response to dopamine was linear, in the concentration range from 1 x 10-6 to 1 x 10-5 mol/L-1. LOD was about 2.81.10-7 mol/L-1, and sensitivity was 3.202 μA/L/mol-1/cm-2. Furthermore, the proposed MIP sensor showed good selectivity, repeatability, reproducibility and stability. Also, it was successfully applied for dopamine determination in urine samples. Keywords: CV; dopamine; DVP; FTIR; MIP; PPY-CTS composite; SEM; TiO2; urine samples; UV-vis.