Removal of nitrates from water by electrocoagulation using a cell with horizontally oriented Al serpentine tube anode

M.H. Abdel-Aziz,E-S.Z. El-Ashtoukhy,M.Sh. Zoromba,M. Bassyouni,G.H. Sedahmed 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-

In this work, removal of nitrates by electrocoagulation in a batch electrochemical cell with horizontallyoriented electrodes was studied, the anode was a horizontal Al serpentine tube whose inner surface canpotentially act as a built-in cooler to control the cell temperature, a H2 evolving Al plate cathode wasplaced beneath the anode at the cell bottom where the stirring action of H2 bubbles improve the mixingconditions at the anode. The effect of operating parameters, such as initial NO3 concentration, initial pHof the solution, applied current density, and NaCl concentration on the removal efficiency wasinvestigated. The electrical energy consumption of the cell was calculated at different operatingparameters in order to optimize the operating conditions. The removal efficiency of the cell reached 100%after 100 min. A kinetic model for the process was proposed and verified by the experimental data. Themerits of the present new cell which is self-stirred and contains a built-in heat transfer facility fortemperature control were highlighted. Importance of the present work for agriculture drainage waterand underground water remediation was pointed out.

Enhancement of heavy metals recovery from aqueous solutions by cementation on a rotating cylinder using a stationary wiper

M.S. Ahmed,T.M. Zewail,E-S.Z. El-Ashtoukhy,H.A. Farag,I.H. El Azab,F.A. Albatati,A.F. Al-Hossainy,M.Sh. Zoromba,M.H. Abdel-Aziz 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-

The goal of the present research is to study the impact of a stationary wiper almost touching a revolvingzinc solid cylinder on the rate of Cu+2 cementation. Initial Cu+2 ions concentration, speed of rotation, andthe effect of the presence and absence of a wiper were investigated. The degree of Cu+2 cementation wasstated in relation to the mass transfer coefficient which was valued under diverse circumstances. Thepresent study showed that the mass transfer coefficient accelerates as rotation speed and quantity of Cu+2increase. The presence of a wiper enhances the degree of Cu+2 cementation by an extent that varies from1.59 to 64% subject to the operational circumstances. The present mass transfer data have beeninterrelated by dimensionless equations. The importance of such relationships in the sizing and runningof rotating cylinders used for performing diffusion- restricted reactions is underlined.

COMPARISON STUDY BETWEEN 3-ELEMENT LOG-PERIODIC AND MONOPOLE ANTENNA FOR INDOOR WLAN APPLICATIONS

M. R. Ahmad,M. K. Rahim,M. Z. Z. Aziz,A. Asrokin,S. P. Jack 대한전자공학회 2006 ITC-CSCC :International Technical Conference on Ci Vol.2006 No.2

Feasibility of clay-shielding material for low-energy photons (Gamma/X)

S.M. Tajudin,A.H.A. Sabri,M.Z. Abdul Aziz,S.F. Olukotun,B.M. Ojo,M.K. Fasasi 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.6

While considering the photon attenuation coefficient (m) and its related parameters for photonsshielding, it is necessary to account for its transmitted and reflected photons energy spectra and dosecontribution. Monte Carlo simulation was used to study the efficiency of clay (1.99 g cm 3) as a shieldingmaterial below 150 keV photon. Am-241 gamma source and an X-ray of 150 kVp were calculated. Thecalculated value of m for Am-241 is higher within 5.61% compared to theoretical value for a single-energyphoton. The calculated half-value layer (HVL) is 0.9335 cm, which is lower than that of ordinary concretefor X-ray of 150 kVp. A thickness of 2 cm clay was adequate to attenuate 90% and 85% of the incidentphotons from Am-241 and X-ray of 150 kVp, respectively. The same thickness of 2 cm could shield thegamma source dose rate of Am-241 (1 MBq) down to 0.0528 mSv/hr. For X-ray of 150 kVp, photons below60 keV were significantly decreased with 2 cm clay and a dose rate reduction by ~80%. The contributionof reflected photons and dose from the clay is negligible for both sources.

Strength of Thixoformed A319 Alloy at Elevated Temperature

A. M. Aziz,M. Z. Omar,Z. Sajuri 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7

When alloys are exposed to elevated temperatures they experience a decrement in their mechanical properties that leadsto material failure. However, the use of thixoforming, an alternative metal processing method, could enhance mechanicalproperties by minimising the defects that exist in as-received alloys. Therefore, this study aimed to determine the tensilestrength of thixoformed A319 under elevated temperatures by taking into account its intended use in vehicle cylinder headcomponents. Thixoformed A319 was compared with as-received alloy manufactured by permanent mould casting. Thecooling slope method was used to prepare the feedstock for thixoforming. The feedstock was reheated by induction heatinguntil it reached 574 °C and was then formed in a mould. Afterwards, the as-received and thixoformed samples underwentT6 heat treatment. The resulting samples were characterised by using optical microscopy, scanning electron microscopyequipped with energy dispersive X-ray, X-ray difraction analysis and a tensile test. Elevated temperature tensile tests wereperformed at 250 °C, in line with the temperature condition experienced by cylinder head components during operation. The ultimate tensile strength of the thixoformed samples was 30% higher than that of the as-received samples under elevatedtemperatures. Also, the analyses of the fracture surfaces showed that porosity, intermetallic compounds and impurities wereamongst the failure factors for both alloys.

Antioxidant activity of Spirulina platensis alleviates doxorubicin-induced oxidative stress and reprotoxicity in male rats

Naglaa Z. H. Eleiwa,Azza A. A. Galal,Reda M. Abd El‑Aziz,Eman M. Hussin 경희대학교 융합한의과학연구소 2018 Oriental Pharmacy and Experimental Medicine Vol.18 No.2

Male infertility is a common side effect of doxorubicin (DOX) that substantially impairs the quality of life of young cancer survivors. Therefore, the current work was designed to evaluate the possible antioxidant and gonado-protective effects of Spirulina platensis (S. platensis) in DOX-treated rats. Intraperitoneal administration of DOX (3 mg/kg b.wt.) once weekly for 5 weeks significantly decreased the levels of testicular catalase, superoxide dismutase and glutathione peroxidase. Moreover, it significantly decreased serum testosterone, luteinizing hormone, and follicle-stimulating hormone levels, as well as sperm motility and sperm count. Additionally, DOX treatment significantly increased the testicular malondialdehyde concentration and the percent of sperm abnormalities and resulted in marked cystic dilation of seminiferous tubules with extensive separation, dissociation of germinal cells from the basement membrane and arrested spermatogenesis. Oral administration of S. platensis at a dose of 300 mg/kg daily for 5 weeks mitigated DOX-induced oxidative stress, testicular damage, hormone alterations and spermiogram abnormalities via its potent antioxidant activity. S. platensis may represent a potential therapeutic option to protect testicular tissue during DOX treatment.

Technologies for production of biodiesel focusing on green catalytic techniques: A review

Helwani, Z.,Othman, M.R.,Aziz, N.,Fernando, W.J.N.,Kim, J. Elsevier Scientific Pub. Co 2009 Fuel processing technology Vol.90 No.12

Biodiesel production is undergoing rapid technological reforms in industries and academia. This has become more obvious and relevant since the recent increase in the petroleum prices and the growing awareness relating to the environmental consequences of the fuel overdependency. In this paper, various technological methods to produce biodiesel being used in industries and academia are reviewed. Catalytic transesterification, the most common method in the production of biofuel, is emphasized in the review. The two most common types of catalysts; homogeneous liquids and heterogeneous solids, are discussed at length in the paper. Two types of processes; batch and continuous processes, are also presented. Although batch production of biodiesel is favored over continuous process in many laboratory and larger scale efforts, the latter is expected to gain wider acceptance in the near future, considering its added advantages associated with higher production capacity and lower operating costs to ensure long term supply of biodiesel.

Design of non-faradaic EDLC from plasticized MC based polymer electrolyte with an energy density close to lead-acid batteries

Shujahadeen B. Aziz,Rebar T. Abdulwahid,Mohd F. Z. Kadir,Hewa O. Ghareeb,Tansir Ahamad,Saad M. Alshehri 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-

The investigation of biodegradable polymer electrolyte for energy device applications is of great importanceas a suitable alternative to the conventional electrolytes. This paper explores the employment ofplasticized methylcellulose (MC)-based polymer electrolytes for energy storage EDLC device applicationwith an energy density (46.29 Wh kg 1) close enough to lead-acid batteries. The results have shown thatthe inclusion of plasticizer can enhance the ionic conductivity to 1.17 10 3 S cm 1. It was found that theprepared polymer electrolyte was stable up to 2.1 V, which is sufficient to be employed as electrolyte andseparator in fabrication of electrical double layer capacitor (EDLC). Both te and ti values have been quantifiedfrom the TNM measurements, where the ti values for the electrolytes containing 32 wt.% and 40 wt. % of glycerol plasticizer have been found as 0.963 and 0.802, respectively. The performance of the assembledEDLC was assessed using both cyclic voltammetry (CV) and charge-discharging responses. Theabsence of redox peaks is evidenced from the CV. The value of initial specific capacitance (Cspe) of the fabricatedEDLC is 411.52 F g 1. The results achieved in this study can be considered as a breakthrough inEDLC devices.

Free vibration of layered cylindrical shells filled with fluid

Nurul Izyan, M. D.,Viswanathan, K. K.,Aziz, Z. A.,Prabakar, K. Springer Science + Business Media 2016 Applied mathematics and mechanics Vol.37 No.6

<P>The vibration of the layered cylindrical shells filled with a quiescent, incompressible, and inviscid fluid is analyzed. The governing equations of the cylindrical shells are derived by Love's approximation. The solutions of the displacement functions are assumed in a separable form to obtain a system of coupled differential equations in terms of the displacement functions. The displacement functions are approximated by Bickley-type splines. A generalized eigenvalue problem is obtained and solved numerically for the frequency parameter and an associated eigenvector of the spline coefficients. Two layered shells with three different types of materials under clamped-clamped (C-C) and simply supported (S-S) boundary conditions are considered. The variations of the frequency parameter with respect to the relative layer thickness, the length-to-radius ratio, the length-to-thickness ratio, and the circumferential node number are analyzed.</P>

Electrochemical removal of sulfide ions and recovery of sulfur from sulfide ions containing wastes

E.G. Saad,T.M. Zewail,A.A. Zatout,E-S.Z. El-Ashtoukhy,M.H. Abdel-Aziz 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-

In this work a two-compartment galvanic cell with two graphite rod electrodes and two types of cationexchange membranes: namely the Nafion membrane and synthetic fabric membrane is tested in treatingsulfide containing wastes and recovery of elemental sulfur. The cell reactions are sulfide oxidation at theanode and chromium (VI) reduction at the cathode. The effect of different parameters such as externalresistance, initial concentration of K2Cr2O7 solution, H2SO4 concentration, and initial concentration ofNa2S, the pH of the solution, NaCl concentration, and temperature of the solution is investigated. The cellperformance as a reactor and as an energy converter is expressed in terms of % sulfide removal andcurrent-voltage plots, respectively. Depending on the effects of the aforementioned factors, the optimalconditions that give the highest performance were determined, and then the cell was tested on realwastes from refinery processing at those conditions. The cell showed high selectivity in sulfide removaland sulfur recovery with almost no interference with other contaminants.