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Fatma A. Bassyouni,Tamer S. Saleh,Mahmoud M. ElHefnawi,Sherein I. Abd El-Moez,Waled M. El-Senousy,Mohamed E. Abdel-Rehim 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.12
Novel heterocyclic compounds containing benzimidazole derivatives were synthesized from 2-(1Hbenzimidazol-2-yl) acetonitrile (1) and arylhydrazononitrile derivative 2 was obtained via coupling of 1 with 4-methyl phenyldiazonium salt, which was then reacted with hydroxylamine hydrochloride to give amidooxime derivative 3. This product was cyclized into the corresponding oxadiazole derivative 4 upon reflux in acetic anhydride. Compound 4 was refluxed in DMF in the presence of triethylamine to give the corresponding 5-(1H-benzimidazol-2-yl)-2-p-tolyl-2H-1,2,3-triazol-4-amine 6. Treatment of compound 6 with ethyl chloroformate afforded 2,6-dihydro-2-(4-methylphenyl)-1,2,3-triazolo[4'',5''-4',5']pyrimido[1,6-a]benzimidazole-5(4H)-one (8). 1,2-bis(2-cyanomethyl-1H-benzimidazol-1-yl)ethane-1,2-dione (10) was synthesized via the condensation reaction of 2-(1H-benzimidazol-2-yl) acetonitrile (1) and diethyloxalate. The reactivity of compound 10 towards some diamine reagents was studied. The in vitro antimicrobial activity of the synthesized compounds was investigated against several pathogenic bacterial strains such as Escherichia coli O157, Salmonella typhimurium, E. coli O119, S. paratyphi, Pseudomonas aeruginosa, Staphylococcus aureus, Listeria monocytogenes and Bacillus cereus. The results of MIC revealed that compounds 12a-c showed the most effective antimicrobial activity against tested strains. On the other hand, compounds 12a, b exhibited high activity against rotavirus Wa strain while compounds 12b, c exhibited high activity against adenovirus type 7. In silico target prediction, docking and validation of the compounds 12a-c were performed. The dialkylglycine decarboxylase bacterial enzyme was predicted as a potential bacterial target receptor using pharmacophorebased correspondence with previous leads; giving the highest normalized scores and a high correlation docking score with mean inhibition concentrations. A novel binding mechanism was predicted after docking using the MOE software and its validation.
Mohamed E. Mahmoud,Asmaa K. Mohamed 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
The present work explores an efficient depositive removal process of La(III) by 5-azo-phenolate-8-hydroxyquinoline (5AP-8HQ) using surface metal sequestration methodology (SMSM). Structural characterization of La(III)-complex was confirmed by different techniques. The highest surface coverage value 1597.4 μg/cm2 was recognized using pH 6.0, 0.01 mol L−1 La(III) and 76 cm2 surface area. The depositive removal of La(III) followed the Freundlich isotherm model (R2 = 0.9972) and the values of thermodynamic parameters assured spontaneous and endothermic processes. Furthermore, among the four investigated kinetics models, pseudo-second-order model (K2 = 1.15 g/mg min) yielded the best fit to describe the removal experimental data of La(III).
Mohamed E. Mahmoud,Mohamed F. Amira,Seleim M. Seleim,Magda E. Abouelanwar 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Nitroaromatic compounds are classified as toxic-carcinogenic pollutants and explosives. The removal ofthese compounds represents a great challenge. Therefore, the adsorption behaviors of 4-nitrobenzoicacid and 4-nitroaniline onto a fabricated nanocomposite were researched via a green functionalization ofzirconium silicate with nano-polyaniline (ZrSiO4–NPANI and 7.22–22.09 nm). Optimization of removalprocess was examined by different experimental conditions. The adsorption mechanism of nitro-compounds onto ZrSiO4–NPANI wasfitted with the pseudo-second-order and both Langmuir andFreundlich models. Excellent recovery of nitrocompounds from tap water (95.4%), industrial wastewater(97.67%) and sea water (95.77%) were established using 25 mg L 1 and 100 1 mg.
Mohamed E. Mahmoud,Nesma A. Fekry,Amir M. Abdelfattah 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
The excessive industrial applications of methylene blue dye and lead ions with their high resistance tobiodegradation in water systems have led to their detection in water effluents as pollutants of major concernand therefore they must be removed by efficient techniques. Carbonaceous based materials as carbonfoam (C-Foam) and graphene quantum dots (GQDs) with sodium alginate are important reactiveadsorbents in water treatment. Therefore, a novel nanocomposite was assembled via crosslinking of zincoxide with carbon foam, GQDs and alginate to fabricate ZnO/C-Foam/GQDs/Alginate. This nanocompositeexhibited homogeneous and spherical particles with 20 nm average size. ZnO/C-Foam/GQDs/Alginate isdesigned to remove Pb(II) and methylene blue (MB) pollutants. The collected results referred to the optimumpH 6 and 7 for Pb(II) and MB, respectively. The computed thermodynamic parameters revealedendothermic and spontaneous reactions by the two pollutants providing DGo from 8.06 to13.67 kJ/mol for lead ion and from 6.23 to 8.19 kJ/mol for MB dye. The interfering species exhibitedalmost insignificant impact. ZnO/C-Foam/GQDs/Alginate nanocomposite confirmed successful reusabilityfor five successive regeneration cycles. Finally, ZnO/C-Foam/GQDs/Alginate nanocomposite providedexcellent removal trends for Pb(II) and MB pollutants from real water samples with100% and 92.2 %removal, respectively.
Mohamed E. Mahmoud,Azza E.H. Abdou,Gehan M. Nabil 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
A method is described for functionalization of nano-zirconium silicate with 3-aminopropyltrimethox-ysilane by a fast solvent-free reaction using microwave-assisted fabrication approach to produce a novelNano-ZrSiO4–NH2 adsorbent. The structure was confirmed from the FT-IR, SEM, TGA and surface areaanalysis. The metal adsorption and selectivity properties were examined and evaluated from thedistribution coefficients (Kd) of a series of metal ions. Nano-ZrSiO4–NH2 was identified to exhibit 6.300,4.000 and 2.100 mmol g 1 as the highest capacity values for Cu(II), Cd(II) and Pb(II), respectively using0.005 g of the adsorbent per 10.0 mL solution. Other important controlling factors were also explored.
Mohamed E. Mahmoud,Azza E.H. Abdou,Aziza K. Shehata,Heba M.A. Header,Ezzat A. Hamed 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Removal of Congo red was completed in 5–20 s using microwave-enforced sorption (MES) as a sustainable technique. Nano-γ-Al2O3 was covalently bonded with 3-chloropropyltrimethoxysilane to produce γ-Al2O3-SiCl nanosorbent via microwave-assisted approach. Congo red extraction by γ-Al2O3 and γ-Al2O3-SiCl were found 58.42% and 69.41% and increased to 66.13% and 81.47%, respectively using 5 and 20 s of microwave heating. The percentage extraction of Congo red (30 mg L−1) by γ-Al2O3-SiCl was increased from 46.21% to 83.61% upon increasing the pH from 1.0 to 10.0. Other controlling conditions were investigated and optimized. Excellent recovery of Congo red from wastewater was established in 20 s.
Mohamed E. Mahmoud,Gehan M. Nabil,Nabila M. El-Mallah,Heba I. Bassiouny,Sandeep Kumar,Tarek M. Abdel-Fattah 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
A method is described for efficient decolorization of reactive red 195 A dye (RR-195A) from aqueous andwastewater samples using modified Switchgrass Biochar (SB) by tetradecyltrimethyl ammoniumbromide (TTAB) as a cationic surfactant for the formation of a novel SB-TTAB adsorbent. The differentcontrolling experimental conditions such as solution pH, initial dye concentration, contact time,adsorbent mass, interfering ions and temperature have been investigated and optimized. Adsorptionequilibrium using Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D–R) isotherm modelshave been also studied and the best fit was related to the Langmuir adsorption isotherm. Adsorptionkinetics have been tested and illustrated using pseudo first-order, pseudo-second-order, intraparticlediffusion and Elovich models. The collected results confirmed that the pseudo-second order kineticmodel exhibited the best fit with the experimental data. Thermodynamic parameters were calculatedand the results referred to an exothermic nature and spontaneity of the adsorption process. Improveddecolorization of reactive red 195 A dye from textile industrial wastewater and other water sampleswere successfully established. Excellent recovery values of RR-195A dye by SB-TTAB adsorbent weredetermined in the ranges of 96.61–98.76%, 97.79–99.26%, 94.24–100.0% and 90.98–92.96% ( 1.0–4.0%)from tap water, raw water, wastewater and sea water, respectively
Towards attaining efficient management of berth maintenance in Saudi Arabian Industrial Ports
Mohammed E. Shaawat,Abdullah Binomar,Abdulaziz S. Almohassen,Khalid Saqer. Alotaibi,Mahmoud Sodangi,Ahmad Aftab Techno-Press 2023 Structural monitoring and maintenance Vol.10 No.1
Despite the significance of ports as critical economic infrastructure, the berth facilities usually deteriorate due to heavy loading, unloading, aging, environmental weather conditions, marine growths, and lack of efficient maintenance management. Marine berths require proactive maintenance management to limit deterioration and defects as no berth facility is maintenance-free. Thus, delay in carrying out maintenance work for the marine berths can be devastating to the operational process involving ship entry, loading, and unloading operations. The aim of this research is to coordinate both operations work, and maintenance works that take place inside the berth of a local industrial port in Saudi Arabia, by developing a novel framework that integrates both works without affecting the efficiency and functionality of the berth. The study focused on defining the operational process of the port and identifying the elements with direct and indirect effects. In addition to determining the priority for the entry of ships inside the berth, it also identified the factors involved in designing a framework that included maintenance work as a component of the monthly berth occupancy schedule. By applying a mathematical model, a framework was established, which includes all the important elements of the process. As a result of the mathematical method formulation process, a database was designed that organizes and coordinates the operations of all berths within the port. This creates time to carry out the required maintenance work monthly as well as ease of coordination with the contractors responsible for the implementation of those works.
Mohamed E. Mahmoud,Amr A. Yakout,Kholoud H. Hamza,Maher M. Osman 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
A simple and solvent-free method is proposed for synthesis of novel magnetic nano-sorbents. Dioctyl phthalate (DOP) was used to encapsulate nano-Fe3O4 and produce a nano-Fe3O4-DOP sorbent. This was treated with triethylenetetramine (TETA) in another solvent-free procedure for the formation of a novel nano-Fe3O4-DOP-TETA. The synthesized nano-sorbents were characterized by FT-IR, TGA, SEM and HRTEM (3.0–12.0 nm). The magnetic solid phase sorption characteristics were studied and optimized. The potential applications of these magnetic solid phase extractors for removal of Ni(II), Cd(II) and Pb(II) from drinking tap water, industrial wastewater and sea water samples were accomplished using a multi-stage micro-column technique
Mohammed Cherif Rahmani,Abdelhakim Kaci,Abdelmoumen Anis Bousahla,Fouad Bourada,Abdeldjebbar Tounsi,E.A. Adda Bedia,S.R. Mahmoud,Kouider Halim Benrahou,Abdelouahed Tounsi 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.25 No.3
The influence of boundary conditions on the bending and free vibration behavior of functionally graded sandwich plates resting on a two-parameter elastic foundation is examined using an original novel high order shear theory. The Hamilton’s principle is used herein to derive the equations of motion. The number of unknowns and governing equations of the present theory is reduced, and hence makes it simple to use. This theory includes indeterminate integral variables and contains only four unknowns in which any shear correction factor not used, with even less than the conventional theory of first shear strain (FSDT). Unlike any other theory, the number of unknown functions involved in displacement field is only four, as against five, six or more in the case of other shear deformation theories. Galerkin’s approach is utilized for FGM sandwich plates with six different boundary conditions. The accuracy of the proposed solution is checked by comparing it with other closed form solutions available in the literature.