Inhibition of copper corrosion in saline solution by mono-hydroxamic acid

The main objective of the present work involved the study of the inhibitive properties of organic product as environmentally friendly as copper corrosion inhibitor, in 3% NaCl solution. The effectiveness of Mono-hydroxamic acid (C12N) used as a corrosion inhibitor for copper in 3% NaCl was investigated by weight loss and electrochemical techniques. Surfaces were characterized by scanning electron microscopy (SEM). The results showed that the chemical investigated provided efficient inhibition of copper corrosion. The inhibition efficiency improved with increasing the inhibitor concentration. C12N acts mainly as a cathodic-type inhibitor

Supported TiO2 on Borosilicate Glass Plates for Efficient Photocatalytic Degradation of Fenamiphos

Supported titanium dioxide (TiO2) was investigated for the photodegradation of the insecticide fenamiphos in water. The photocatalyst was immobilised on borosilicate glass plates and the kinetics of degradation were studied in a stirred tank reactor under UV irradiation. Two types of TiO2, for example, Millennium PC500 (100% anatase) and Degussa P25 (80% anatase, 20% rutile), were used. Their activities have been based on the rates of insecticide disappearance. Experiments were investigated to evaluate the effect of pH and initial concentrations of fenamiphos as well as catalyst doses on the photocatalytic degradation of fenamiphos. Kinetic parameters were experimentally determined and an apparent first-order kinetic was observed. For photolysis process of fenamiphos, two photoproducts were identified and characterized using high performance liquid chromatography/mass spectrometry (HPLC/MS). The plausible mechanism of photolysis involved is the oxidation of sulfonamide group. In presence of photocatalyst TiO2, photodegradation was observed. Under identical conditions, Degussa P25 shows higher photocatalytic activity in regard to PC500 Millennium and complete degradation was observed after 180 min

Adsorption and mobility of veterinary compounds on Moroccan soil; Case of Ivermectin

Ivermectin (IVR) is an antihelmitic and anti-parasitic substance used mainly in veterinary medicine worldwide. Its release in the environment could have a negative effect on living organisms and generate soil and groundwater pollution. The main objective of this work aimed at the study of the adsorption of IVR on soil from Gharb region in Morocco. Sorption tests were carried out according to conventional guideline by varying the mass of the adsorbate and the pH of the solution. Analysis was made by UV-visible spectrophotometer. Adsorption kinetics of IVR was rapid and equilibrium was reached within 20 minutes. The Freundlich and Langmuir isotherms models were compared and adsorption constants were calculated. Comparison between the two models showed that Freundlich model fitted best data while kinetic data fitted pseudo-second order. Thermodynamically, sorption process of IVR on the examined soils would be exothermic and controlled by physisorption Tests of mobility have shown strong adsorption of IVR in the soils tested After 7 batches of water percolated, less than 2% of the applied quantity has been detected

Sawdust Essential Oil of Cedrus Atlantica as Eco-Friendly inhibitor against mild steel corrosion in 1M HCl solution

The inhibition efficiency of wood sawdust essential oil of Cedrus Atlantica against mild steel corrosion in 1M HCl solution has been tested using electrochemical impedance spectroscopy (EIS) and Potentiodynamic polarization. Polarization measurements revealed cathodic-type inhibitor behavior. The inhibitory efficacy assessed by both polarization and (EIS) techniques was in typical agreement, with %IE values of 95.09 5% and 95.82 % at 250 ppm of oil essential. Based on the kinetic and thermodynamic properties Kads and rG°ads, it is concluded that WSCA oil adsorption occurs via a physisorption process and follows the Langmuir isotherm. In addition, the temperature effect was studied at (303–333 K), and the thermodynamic parameters (Ea, rH, rS) were determined and discussed to elaborate the corrosion mechanism. The corrosion inhibition effect was discovered to be temperature and inhibitor concentration dependent

Adsorptive removal of Methylene Blue, from aqueous solution using Tea Waste as a Low-Cost indigenous biosorbent: Mechanism of Adsorption, Equilibrium Study, Kinetics and Isotherms

For the current investigation, extracted Tea-Waste has been employed without activation for Methylene Blue removing in aqueous media. The experiment has been operated under batch conditions. The impact of a variety of significant factors affecting adsorption process, of which, adsorbent particle size, adsorbent/adsorbate shaking time, adsorbent dose, pH medium as well as the adsorbate initial concentration on Methylene Blue removing were investigated for optimization of the process according to the One Factor At a Time approach. The laboratory results revealing that this process is both spontaneously occurring and feasible. It has been demonstrated that maximal removing percentage (R) of 78.92% was obtained at a maximal experimental adsorption capacity (Qm,exp) of 7.892 mg.g-1. Methylene Blue adsorptive to Tea-Waste was according to the (S-class) isotherm. The Pseudo-Second-Order Kinetic Model agrees perfectly with results, with an adsorption capacity calculated (Qe,cal) of 7.194 mg.g-1. Also, we can affirm a best fitting adsorptive process through Langmuir's isothermal model, this confirms an adsorptive effect occurring in homogeneous area of Tea-Waste. Maximum calculated adsorption capacity (Qm,cal) defined by using Langmuir's has proven up to 14.085 mg.g-1. Consequently, the research suggests that Tea-Waste is a highly interesting option for efficiently treating real wastewater polluted by Methylene Blue

DFT and Molecular docking study of natural molecules proposed for COVID-19 treatment

AbstractEmergence and spread of corona virus disease 2019 (COVID-19), caused by severe respiratory syndrome coronavirus, is considered a public health emergency threatening global health systems, as of June, 2020, It caused a cumulative total of 9,033,423 confirmed cases and more than 469,539 deaths across 215 countries, person to-person transmission has being identified as the route for spreading. So far, the lack of effective vaccines for the treatment or prevention of Covid-19 has further worsened the situation. In this context, the present study aims to assess whether naturally occurring components have an antiviral effect via a computational modeling approach. Density Functional theory (DFT) was performed to estimate the kinetic parameters, frontier molecular orbitals, molecular electrostatic potential as well as chemical reactivity descriptors of various ligands. The results revealed that Crocin and Digitoxigenin exhibited a potential applicant with the lowest resistance to electronic charge transfer with a chemical hardness of 2.19eV and 2.96eV respectively, as well as the lowest HOMO-LUMO difference. In addition to the DFT calculation, a docking simulation study was conducted on the SARS-CoV-2 base protease (PDB: 6LU7) to determine the binding affinity of ligands. The findings show that Crocin exhibits the lowest binding energy of -8.1 Kcal/mol and may be a good inhibitor of CoV-2-SARS compared to hydroxychloroquine and chloroquine, which have a binding affinity of -5.4 and -4.9 Kcal/mol, respectively. The high binding affinity of L3 was assigned to the existence of 14 hydrogen bonds connecting the ligand to the critical amino acid residues of the receptor

Physico-Chemical Characterization of Water and Soil of the M’nasra region in the Gharb plain (Northwest Morocco)

The aim of this work is to carry out an evaluation of the quality of agricultural soils and water in the irrigated area of the M’nsara region in the Gharb plain (Northwest Morocco) with the goal of describing the degree of degradation of natural resources and improve the sustainability of the environment and irrigated farming systems of the region through optimal management of these resources. Eighteen water and nineteen soil samples were collected based on existing soil and piezometric maps of the irrigated areas, distributed into 3 different zones: A, B, and C. Characterizations of the main parameters of soil and irrigation water quality were made. Irrigation water salinity varies between 0.5 and 1.3 dS/m. The irrigated soils from the groundwater have shown a secondary salinization superior to that of irrigated soils by the waters of the dam. Cultivated soils present a salinity that reaches 1.90 dS/m in some areas. The results show that 68.4% of the soil samples are poor to moderately poor in organic matter. The sodium adsorption ratio (SAR) shows a minimal risk to accumulate sodium in the soil with 16.7% is slightly alkaline. The soils are weakly to moderately basic and represent respectively 73.7 and 10.5 % of the study area. Potassium and available phosphorus have very low values in the majority of soils which will have a negative impact on the environment. The spatialization of these parameters was performed by the determinsitc method of inverse distance weighted (IDW). In order to delineate areas that are a priori subject to environmental degradation in order to understand the effect of agricultural intensification on the sustainability of natural resources, taking into account the type of management water irrigation in the arid region

Detecting cadmium(II) by using coal extracted from argan oilcake waste (Argania spinosa) as modifier of carbon paste electrode.

The detection of Cd2+ ions was studied by cyclic voltammetry (CV) and Square Wave Voltammetry (SWV). This method is mainly based on the accumulation of Cd2+ ions on the surface of a carbon paste electrode modified by coal extract from argan oilcake waste (AC-CPE). To evaluate the detection  performance of AC-CPE against Cd2+ ions, an optimization  study was carried out to determine the following optimal conditions, pH=5, preconcentration time of 120s, and deposition potential of 1.2V. Under these optimal conditions, a linear relationship between current peak intensity and concentration has been defined  over a concentration range from 5.10-4 to 5.10-7M; with detection limit (DL, 3 б) of 3.04x10-6M. An analytical application of the electrode in a real matrix, tap water, was performed and revealed good detection performance of AC-CPE. These results show that the AC-CPE can be used as an excellent detector of Cd2+ ions in aqueous solutio

Multivariate analysis and A GIS-based method to assess surface water quality in the Sakia El Hamra River Near Laâyoune City, Morocco

In the Laâyoune Sakia El Hamra region of Morocco, characterized by scarcity, fragility, and uneven distribution of water resources, acute water stress is prevalent due to overexploitation, climate change, and the escalating degradation of water quality from human activities. The Sakia El Hamra River, a vital watercourse, is subjected to continuous pollution from domestic waste and untreated wastewater from Laâyoune city, impacting a section designated as a Ramsar site. This study aims to enhance understanding of these impacts within the region. A series of physicochemical parameters were monitored spatiotemporally at multiple points along the river, both upstream and downstream of the Sakia El Hamra dam. The findings indicate that while the reservoir water maintains acceptable quality, influenced by evaporation, the salinity levels do rise. Conversely, the downstream water quality exhibits excessive mineral concentrations, far surpassing acceptable standards, as evidenced by elevated electrical conductivity. Furthermore, significant pollution levels are confirmed by high measurements of biochemical oxygen demand, chemical oxygen demand, total phosphorus, ammoniacal nitrogen, and other contaminants.  The mapping of water quality indicators in the Oued Sakia El Hamra River, was achieved using a Geographical Information System (GIS) based on the Water Quality Information System and spatial analysis with Inverse Distance Weighted (IDW) interpolation. The analysis reveals that the water quality downstream poses a substantial risk to the Foum El Oued aquifer and the local aquatic ecosystem, especially in zones affected by wastewater discharge and spring runoff. Mapping water quality will help to monitor and enforce standards and regulations to manage and control pollution