1,115 Works

Electrochemical sensor in situ control of acidity level of concentrated HCl solutions

The experimental device consisting of two paste electrodes: ferrocene and quinone at fixed current potentiometry was studied for the in-situ control of the acidity level of hydrochloric acid solutions at moderate concentrations between 0.6 and 8.0 M. The influence of different factors affecting the variation of potential at imposed current were already studied in previous papers published on H3PO4, H3PO4 and HClO4. Also, the measured potential variations Ei between ferrocene and orthochloranil (oQ) or parachloranil...

Structural evolution and impact on the compressive strength of fly ash-based geopolymers

A. EL Hadrami, S. Ojala, E. M. Chatir, J. Assaoui & R. Bbrahmi
This paper concentrates on valorization of the fly ash originating from thermal power plant by alkaline activation. Structural and textural characterization of raw material and prepared geopolymers was carried out. The used raw material belonged to Class F according to ASTM C618-05, and it was mainly composed of quartz, mullite, hematite and calcite, that coexisted with hydroxy-sodalite in final geopolymers. The proportion of the hydroxy-sodalite phase increased with the concentration of the activating agent. During...

Synthesis and characterization of vanadium pentoxide on different metal oxides by the sol-gel process for application in the conversion of the SO2 to SO3

Sulfuric acid is the largest volume chemical currently produced in the world. Is manufactured by the contact process, it involves three stages: combustion, conversion and absorption. The SO2 conversion reaction is the key step in the process, it uses catalysis. The objective of this work is to synthesize a series of mixed vanadium oxides X% / MO2 with M (Si, Al and Ti) by sol-gel process followed by calcination at 400 ° C, in order...

Combined 3D-QSAR Modeling and Molecular Docking Study on metronidazole-triazole-styryl hybrids as antiamoebic activity

A series of twenty-two metronidazole-triazole-styryl hybrids as antiamoebic agents were studied based on the combination of 3D-QSAR and surflex-docking. The CoMFA and CoMSIA models were carried out using eighteen compounds in the training set and four compounds in the test set gives Q2 values of 0.684 and 0.664 respectively, and R2 values of 0.882 and 0.894 respectively. The adapted alignment method with the suitable parameters resulted in reliable models. Based on contour maps produced by...

Investigation of the Corrosion Behavior of Mild Steel/H2SO4 Systems

A. H. Al-Moubaraki S. D. Al-Malwi
The corrosion behavior and mechanism of mild steel/H2SO4 systems were examined using hydrogen gas evolution, HE, and weight loss, ML as chemical measurements, and electrochemical impedance spectroscopy, EIS, and potentiodynamic polarization, PDP as electrochemical measurements at 30oC. From the chemical results, the corrosion rate of mild steel increased as well as increasing acid concentration, with a reaction constant of 0.70 and 0.60 for HE and WL, respectively. Different features including general and pitting corrosion can...

Removing polyphenols contained in olive mill wastewater by membrane based on natural clay and Hydrotalcite Mg-Al

S. Allaoui, M. Naciri Bennani, H. Ziyat, O. Qabaqous, N. Tijani & N. Ittobane
The purpose of this work is to study the performance of a membrane based on Ghassoul and Hydrotalcite (GHTM) in the retention of polyphenols (organic pollutants). This membrane was elaborated and characterized in our laboratory and was used in the filtration of olive mill wastewaters (OMW) of semi-modern unit of the olives. The choice of these materials depends essentially on their interesting properties (low cost, abundantly in nature and the ease of the preparation).The diluted...

Crystal structure, vibrational and spectroscopic study of single crystal (C6H15N4O2)H2PO4.H2O

S.Zerraf S. Belaaouad
A single crystal was selected from the reaction product of a stoichiometric mixture of phosphoric acid (H3PO4) to which was added the L-arginine (C6H14N4O2) and its crystal structure was determined from three dimensional X-ray diffraction data. The structure is monoclinic, space group P21, a = 7.3450(14) Å, b = 7.9176(15) Å, c = 10.8796(22) Å, β = 97.98(2)°, V = 626.57(186) Å3 and Z = 2, least squares refinement was converged to R1=0.0456, wR2=0.1433 for...

Grafting of fibrillated cellulose with acrylic compounds: Synthesis, Properties and Biodegradation

Tabaght Fatima Ezahra, El IdrissI Abderrahmane, Achelhi Nafea, Elyousfi Redouane, Bellaouchi Reda, Asehraou Abdeslam & Elbarkany Soufian
The cellulose and cellulose acetate (CA) have been directly grafted with an acrylic compounds using a grafting to method with a free isocyanate group as a coupling agent in homogeneous medium. The grafting reaction parameters were optimized compared to grafting reaction in heterogeneous conditions. The grafted products (Cell-RSH, Cell-R’SH, CA-RSH and CA-R’SH) with well-defined architecture were characterized by FTIR, 1H NMR and 13C NMR, their thermal degradation was also studied by thermal analysis (TGA/ DTG)....

Enhancing the Removal of Organic Pollutant-Methylene Blue- by a Morroccan Natural Clay

M. Taibi M. EL Achouri
In this study, the removal of a cationic dye namely, methylene blue (MB) by natural clay (NC) from aqueous solution was investigated. The morphology, structure and surface state of NC were characterized using X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM)) and Optical Microscope, respectively. Affecting factors solution pH, dye concentration, contact time and temperature were investigated. The maximum removal was obtained at basic...

Adsorption of a dye and a real rejection of textile on sludge from drinking water treatement

H. ELMONTASSIR, K. ELFALAKI, Y KARHAT & M. AFDALI
The characterization of sludge from the production of drinking water shows that it is silico-aluminous clays with the dominance of mineralogical phases kaolinite muscovite. Our job is to valorize this sludge as an adsorbent material for the discoloration of methylene blue and and reducing the pollutant load of a real rejection of textiles. The effect of different experimental parameters such as adsorbent mass, pH and contact time were studied. We also studied the effect of...

Treatment of hot-dip galvanization by coagulation-flocculation, adsorption and by new hybrid process coagulation-flocculation/adsorption using lime-(chitosan-epichlorohydrin)/activated carbon based on dates stones

In this work, we conducted a study that is to bleach wastewater loaded with ions, while using and optimizing the process of hybridized treatment of liquid effluents by of coagulation-flocculation/adsorption (CF-ADS). According to the separate optimization of flocculation processes (optimum dose of the flocculant (chitosan cross-linked by epichlorohydrin (chitosan-ECH))) and adsorption (activated carbon based on dates stones), we combined the two methods in order to increase performance fading exploited wastewater. The results of the rate...

Calibration of GFS model by using real time weather data for water requirement forecasting of vegetables in Chtouka region

In the ultimate goal to forecast weather parameters in the agriculture field and precisely in predicting water requirements, a software was developed based on Global forecasting system. To assess its reliability, data of six weather stations were used in the Chtouka region to provide measured weather parameters and allow, thus, software calibration. Air temperature, air humidity, global radiation, evapotranspiration, precipitation and wind speed/direction are studied as weather parameters. Based on statistical comparisons using normalized root...

Identification of phytocemical compounds in ethanol and n-hexane leaf extracts of Piper retrofractum vahl. by gas chromatography mass spectrometry

Piper retrofractum or Javanese chili is one of the Piperaceae family species which has the potential to be used as herbal medicine. The purpose of this research was to investigate bioactive compounds of ethanol and n-hexane extracts in the P. retrofractum leaves. P. retrofractum leaves were first washed and dried, crushed into powder, before being extracted with ethanol and n-hexane. Chromatogram profile showed that ethanol and n-hexane extracts contained 21 compounds and 16 compounds respectively....

Utilization of Olive Mill Waste in Microbial Electrolysis Cell

Huseyin Yemendzhiev, Ralitza Koleva, Farid Zerrouq & Valentin Nenov
Olive oil production is a source of huge amount of residuals knowns as OMW (Olive Mill Waste). The sustainable management and treatment of this waste is challenging due to presence of high amount of specific pollutants. The OMW is characterized by very high COD to BOD ratio with considerable content of polyphenols reaching up to 15g/l. Due to this, the biological utilization of OMW could be hindered or very slow when the conventional aerobic and...

Statistical Investigation of the Effect of Major Parameters of False Twist Texturing on the Dyeing Characteristic and Color Properties of Microfilament Polyester Yarn

Taghavi Deilamani
Microfilament polyester yarns are one of the most important and widely used yarns in the textile industry and the fabrics produced from these yarns have a large consumption. One of the most important issues regarding fabrics made from Microfilament yarns is the issue of dyeing and dyeing properties of these fabrics. Among the concerns of DTY polyester yarn manufacturers are the conditions for producing and texturizing these fibers. Choosing the right range for each of...

Study of Pyrazolo[3,4-d] pyrimidine Derivative as Corrosion Inhibitor on 904L stainless Steel in Molar H3PO4

M. Boudalia, A. Bellaouchou, A. Guenbour, H. Bourazmi, M. Tabiyaoui, M. El Fal, Y. Ramli & H. Elmsellem
The corrosion inhibition of stainless steel type 904 L SS with different concentrations (10-3-10-6 M) of 1,5-diallyl-1H-pyrazolo[3,4-d] pyrimidine (DPP) in acid solutions was investigated by potentiostatic polarization measurements. The effect of temperature (298-353°K) on corrosion parameters was examined. The open circuit potential values in the presence and absence of DPP noted before and after experiments indicated the formation of passive film on the surface of the samples. It was found that corrosion potential (Ecorr) increases...

Elaboration of tin deposits in the presence of Bis-glucobenzimidazolone

S. Cherrouf, Y. Salhi, A. Benabida, H. Elgrini, M. Cherkaoui, L. Lakhrissi & B. Lakhrissi
The tin deposit was elaborated electrolytically on an ordinary steel substrate in SnSO4 based electrolyte in acid medium with and without additive (bis-glucobenzimidazolone) at ambient temperature. The influence of bis-glucobenzimidazolone on the electrochemical properties of the coating was investigated using both the stationary method and the chronopotentiometry. On the other hand, the surface state of the deposit obtained was characterized by optic microscopy. The results have shown a good surface quality of the deposit elaborated...

Chemotypes of Algerian and Moroccan Thymus ciliatus

H. Cherchar, D. Berrehal, A. Khalfallah, A. Kabouche & Z. Kabouche
Essential oils compositions of hydrodistilled fresh aerial parts of Thymus ciliatus (Lamiaceae), growing in various soils of Algeria and Morocco with different climates, are compared here. Carvacrol (0.2-80.3%), p-cymene (0.8-19.6%), γ-terpinene (0.2-14.6%), thymol (0.2-79.1%), camphor (7.5%), α-pinene (8.7%), α-terpinene (12.3%), trans-β-ocimene (25.8%) and nerolidol (6.9%) were the main components of the studied essential oils.

Mini review on synthesis, antimicrobial and cytotoxic activities of oxazinone derivatives

Mohammad Asif
There has been considerable interest in the development of novel oxazinone compounds with as anti-inflammatory, antimicrobial and anti-HIV, anticancer activities. Oxazinones are possessing important class of compounds for new drug development. Therefore, many researchers have synthesized these compounds as target structures and evaluated their biological activities. These observations have been guiding for the development of new oxazinones that possess varied biological activities.

Development of Square Wave Voltammetric Method for the Electrochemical Determination of Pregabalin as Pregabalin-Cu(II) Complex Using Graphite Electrode

Ali F. Al-Ghamdi
In the present study, a square wave voltammetric (SWV) method was developed for the determination of pregabalin (PREG) in commercial drugs and biological samples as PREG-Cu(II) complex using graphite working electrode. A well-defined voltammetric signal of the complex was observed at nearly – 200 mV, by using Britton Robinson supporting electrolyte (B-R) at pH 7.5. There were some analytical conditions that have been evaluated through this research such as accumulation time and potential, scan rate,...

Conductimetric and Tensiometric studies of acrylamide-co-4vinylpyridine (AM-4VP-9) copolymer in aqueous media

Bouras Brahim, Mansri Ali & Hocine Tayeb
A copolymer of acrylamide (AM) and 4-vinylpyridine (4VP) (POLY(AM-CO-4VP)) was synthesized by radical adiabatic copolymerization in aqueous solution. The synthesized copolymer was identified by 1H NMR, 13C NMR, UV-visible spectra and conductimetry. The molecular weights are obtained by GPC and viscosity. The conductimetry measurement showed that the copolymerisation methods caused a hydrolysed acrylamide function. On the order hand the variation of the surface tension of aqueous copolymer solutions with copolymer concentration revealed a surfactant behavior...

Role of electrode materials in the Electrochemical Oxidation of Malachite Green dye

Rajvir Kaur & Harpreet Kaur
The aim of the present study is to degrade Malachite green (MG) dye electrochemically, which is become an alternative attractive method in recent years. The degradation of dye was studied in KCl as supporting electrolyte medium at graphite anode and platinum cathode under amperostatic condition. The variation of the dye concentration was accessed by UV-Visible measurements and Chemical oxygen demand (COD) reductions were also performed. The results clearly shown that at the optimum conditions(current density...

A brief review article: Various synthesis and therapeutic importance of 1, 2, 4-triazole and its derivatives.

ALIMAMAD HARUNBHAI MALANI, ATUL H MAKWANA & Hetal R Makwana
Heterocyclic compounds play an important part in medicinal chemistry. Different derivatives of heterocyclic compounds are useful for the various pharmacological activities. Up to till date lots of work has been completed in five member heterocyclic triazole derivatives. There are two isomer of triazole derivatives which are 1, 2, 3 and 1, 2, 4- triazole. Out of which 1, 2, 4-triazole derivatives posses a wide range of therapeutic activities such as antibacterial, antifungal, antitubercular, anticancer, anticonvulsant,...

Evaluation of corrosion protection of epoxy coatings on copper during exposure to an aerated 3% NaCl solution.

, M. El Gouri, M. Ebn Touhami & A. El Harfi
In this study the anticorrosion performance of a clear epoxy coating was enhanced by the incorporation of modified zinc into the polymer matrix. The structural macroscopy by X-ray diffraction (XRD). Corrosion performance of the coated copper specimens was investigated employing polarization measurements and electrochemical impedance spectroscopy (EIS) in 3% NaCl solution. Incorporation of 5 wt% zinc possessed the best corrosion performance. The electrochemical results are completely in agreement with the morphological results of the surface...

Targeting VEGF to design pyrimidines against breast cancer and diabetic retinopathy

Ramesh L. Sawant, Rahul Kale, Jyoti Wadekar, Amol Ghodechor & Abhijit Sherkar
A library of 900 pyrimidine derivatives was screened virtually on vascular endothelial growth factor (VEGF) using Vlife MDS 4.1 software to identify potential candidates with anticancer and anticataract activity. A series of 2,4,6-substituted pyrimidine derivatives were synthesized in good yields from chalcones, where chalcones have been prepared according to claisen - schimidt condensation by condensing various ketones with aromatic aldehyde in presence of ethanol and sodium or potassium hydroxide. Their structures were confirmed by IR,...

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  • 2020
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