N.K. Amin

Alexandria University, Al Iskandarīyah, Alexandria, Egypt

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Publications (12)21.06 Total impact

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    ABSTRACT: The present study is concerned with the removal of copper powder from aqueous solution by cementation on a stationary disc placed inside an agitated vessel. The influence of several parameters on the rate of cementation, such as initial copper sulphate concentration, impeller rotational speed, presence of surfactant (Triton X-100), distance between the disc and the impeller, type of blade turbine and presence of baffles, has been investigated. The rate of cementation was found to increase with increasing impeller rotational speed and initial copper sulphate concentration. On the other hand, the rate decreases with increasing distance between the disc and the impeller. The rate of cementation was inhibited in solutions containing Triton X-100. Performance of a four-blade 90 degree turbine with regard to the rate of copper cementation was superior to the performance of a four-blade 45 degree pitched turbine. The present data can be correlated in terms of mass transfer coefficient of cementation as Sh = 0.905 Sc0.33 Re0.89 (d/l)0.41 (four-blade 90 degree turbine); Sh = 0.815 Sc0.33Re0.79 (d/l)0.47 (four-blade 45 degree pitched turbine), for the conditions 2035 < Sc < 2810 and 35,000 < Re < 179,000.
    Environmental Technology 05/2014; 35(9-12):1208-18. · 1.61 Impact Factor
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    O. Abdelwahab, N.K. Amin
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    ABSTRACT: The present study is concerned with the removal of phenol from aqueous solution by adsorption onto low cost adsorbent. Luffa cylindrica fibers, LC, were investigated as an adsorbent for the removal of phenol. Batch adsorption experiments were performed as a function of pH, contact time, phenol concentration, adsorbent dose and temperature. The optimum conditions for maximum adsorption were attained at pH 7, LC dose of 3 g/L. Langmuir, Freundlich, Tempkin and Dubinin–Radushkevich isotherm models were selected to evaluate the adsorption of phenol on LC. It was found that the Langmuir isotherm model best fits the phenol adsorption onto LC. The pseudo-second-order rate equation as well as the micropore diffusion model described the kinetic data well. The adsorption process was found to be an exothermic process. Thermodynamic parameters of phenol adsorption were calculated. The FT-IR analysis confirms that the adsorption of phenol on LC has a good and favorable adsorptive capacity.
    The Egyptian Journal of Aquatic Research. 01/2014;
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    ABSTRACT: The present study aimed to investigate the corrosion behavior of a pipeline carrying dilute pulp fiber suspensions (0.1–0.3% consistency). To examine the role played by pulp fibers on the rate of diffusion controlled corrosion of metals an accelerated test which involved the diffusion controlled dissolution of copper in acidified dichromate was used under turbulent flow conditions. Different concentrations of pulp fibers at different solution velocities were studied. The rate of mass transfer controlled corrosion of copper was found to increase by increasing solution velocity and decrease by increasing pulp consistency. The data in the presence and absence of the pulp slurry were correlated by dimensionless equations. The importance of the present results in estimating the rate of corrosion in equipment used in the pulp and paper industry especially pipelines and heat exchangers were highlighted. The decrease in the rate of diffusion controlled corrosion in the presence of the pulp was explained in terms of the drag reducing ability of pulp slurry.
    Chemical Engineering Research and Design 01/2014; · 1.93 Impact Factor
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    ABSTRACT: The present study is concerned with the mass transfer and kinetics study of zinc ions removal from aqueous solution using a cation exchange resin packed in a rotating cylindrical basket reactor. The effect of various experimental parameters on the rate of zinc ion removal, such as initial zinc ion concentration, packed bed rotation speed and temperature has been investigated. In addition to find a suitable equilibrium isotherm and kinetic model for the zinc ion removal in a batch reactor. The experimental isotherm data were analyzed using the Langmuir, Freundlich and D–R equations. The equilibrium data fit well in the Langmuir isotherm. The experimental data were analyzed using four sorption kinetic models, pseudo-first and second-order equations, the Elovich and the intraparticle diffusion model equation, to determine the best fit equation for the biosorption of zinc ions onto purolite C-100 MH resin. Results show that the Elovich equation provides the best correlation for the biosorption process.
    Chemical Engineering Research and Design 01/2013; 91(1):165–173. · 1.93 Impact Factor
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    ABSTRACT: The Kinetics of copper cementation onto zinc Raschig rings in a rotating packed bed cylindrical reactors have been studied. The effect of initial concentration of copper ions, packed cylinder rotation speed and diameter of zinc Raschig rings on the rate of cementation has been investigated. The influence of zinc packing geometry (Raschig rings and cylinders), the presence of surfactant (Triton X-100) and sand particles in the solution were also studied. The rate of cementation was found to increase with increasing cylinder rotation speed raised to a power of 0.947 and solid to liquid ratio. The rate decreases with increasing the initial copper ions concentration and the diameter of zinc Raschig rings. The rate of cementation was inhibited in solutions containing Triton X-100. Raschig rings were found to increase the rate of cementation more than cylinders. The present reactor proved to be more efficient than the traditional solid rotating cylinder reactor for cementation reactions in view of its high area per unit volume and its high rate of mass transfer. The present data can be correlated in terms of the mass transfer coefficient of cementation by the equation: . For the conditions 13900 < Re < 70500, 2056 < Sc < 2202.Nous avons étudié la cinétique de la cémentation du cuivre sur les anneaux de Raschig en zinc dans un réacteur cylindrique à lit de garnissage rotatif. Nous avons également examiné les effets des concentrations initiales d'ions cuivre, de la vitesse de rotation du cylindre à garnissage et du diamètre des anneaux de Raschig en zinc sur le taux de cémentation. L'influence de la géométrie du garnissage en zinc (anneaux de Raschig et cylindres) ainsi que la présence de surfactant (Triton X-100) et de particules de sable dans la solution ont également été étudiées.Il a été démontré que le taux de cémentation augmente lorsque la vitesse de rotation du cylindre augmente jusqu'à une puissance de 0,947 et un rapport solide/liquide. Le taux diminue lorsque l'on augmente la concentration initiale d'ions cuivre ainsi que le diamètre des anneaux de Raschig en zinc. Le taux de cémentation a été inhibé dans des solutions contenant du Triton X-100. Selon les résultats, les anneaux de Raschig augmentent plus le taux de cémentation que les cylindres. Le présent réacteur a été plus efficace que les réacteurs traditionnels à cylindres rotatifs solides en matière de réactions de cémentation. Cette efficacité accrue est due à la plus grande surface par unité de volume et son taux élevé de transfert de masse. Les présentes données peuvent être corrélées en matière de coefficient de transfert de masse de cémentation par l'équation: . Pour les conditions suivantes: 13900 < Re < 70500, 2056 < Sc < 2202. © 2010 Canadian Society for Chemical Engineering
    The Canadian Journal of Chemical Engineering 12/2010; 89(3):609 - 616. · 1.00 Impact Factor
  • E-S Z el-Ashtoukhy, N K Amin
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    ABSTRACT: The present work represents a comparative study for removing acid green dye 50 by anodic oxidation and electrocoagulation using a new batch self gas stirred electrochemical cell. The effect of operating parameters such as current density, initial dye concentration, NaCl concentration and pH on the efficiency of colour removal has been examined. The chemical oxygen demand (COD) reduction under suitable operating conditions was also calculated and found to be reduced by 68% and 87% in case of electrochemical oxidation and electrocoagulation methods, respectively. The results indicate that electrocoagulation is more economic than anodic oxidation, energy consumption ranged from 2.8 to 12.8 kWh/kg dye removed in case of electrocoagulation while in case of anodic oxidation it ranged from 3.31 to 16.97 kWh/kg dye removed. Although the mechanisms of electrocoagulation and anodic oxidation are different, results show that the first-order rate equation provides the best correlation for the decolourization rate of acid green 50 by the two methods.
    Journal of hazardous materials 03/2010; 179(1-3):113-9. · 4.14 Impact Factor
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    ABSTRACT: Electrochemical treatment of organic pollutants is a promising treatment technique for substances which are resistant to biodegradation. In this study an electrochemical treatment based on the principle of anodic oxidation was used to treat paper mill effluent from Rakta's Pulp and Paper Company where rice straw is used to produce paper pulp. Experiments were carried out in a cylindrical agitated vessel lined with lead sheet as anode while a concentric cylindrical stainless steel sheet screen was placed as a cathode. The effect of current density, pH, NaCl concentration, impeller rotational speed and temperature on the rate of color and COD removal was studied. The results showed that the use of electrochemical technique reduces the COD from an average value of 5500 to 160. The percentage color removal ranged from 53% to 100% depending on the operating conditions. Energy consumption calculation shows that energy consumption ranges from 4 to 29 kWh/m3 of effluent depending on the operating conditions. The experimental results proved that the electrochemical oxidation is a powerful tool for treating paper mill effluents where rice straw is used as a raw material.
    Chemical Engineering Journal. 01/2009;
  • Nevine Kamal Amin
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    ABSTRACT: The use of cheap, high efficiency and ecofriendly adsorbent has been studied as an alternative source of activated carbon for the removal of dyes from wastewater. This study investigates the use of activated carbons prepared from pomegranate peel for the removal of direct blue dye from aqueous solution. A series of experiments were conducted in a batch system to assess the effect of the system variables, i.e. initial pH, temperature, initial dye concentration adsorbent dosage and contact time. The results showed that the adsorption of direct blue dye was maximal at pH 2, as the amount of adsorbent increased, the percentage of dye removal increased accordingly but it decreased with the increase in initial dye concentration and solution temperature. The adsorption kinetics was found to follow pseudo-second-order rate kinetic model, with a good correlation (R(2)>0.99) and intra-particle diffusion as one of the rate determining steps. Langmuir, Freundlich, Temkin, Dubinin-RadushKevich (D-R) and Harkins-Jura isotherms were used to analyze the equilibrium data at different temperatures. In addition, various thermodynamic parameters, such as standard Gibbs free energy (DeltaG degrees ), standard enthalpy (DeltaH degrees ), standard entropy (DeltaS degrees ), and the activation energy (E(a)) have been calculated. The adsorption process of direct blue dye onto different activated carbons prepared from pomegranate peel was found to be spontaneous and exothermic process. The findings of this investigation suggest that the physical sorption plays a role in controlling the sorption rate.
    Journal of hazardous materials 10/2008; 165(1-3):52-62. · 4.14 Impact Factor
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    ABSTRACT: This study explores the possibility of using electrocoagulation to remove phenol from oil refinery waste effluent using a cell with horizontally oriented aluminum cathode and a horizontal aluminum screen anode. The removal of phenol was investigated in terms of various parameters namely: pH, operating time, current density, initial phenol concentration and addition of NaCl. Removal of phenol during electrocoagulation was due to combined effect of sweep coagulation and adsorption. The results showed that, at high current density and solution pH 7, remarkable removal of 97% of phenol after 2h can be achieved. The rate of electrocoagulation was observed to increase as the phenol concentration decreases; the maximum removal rate was attained at 30 mg L(-1) phenol concentration. For a given current density using an array of closely packed Al screens as anode was found to be more effective than single screen anode, the percentage phenol removal was found to increase with increasing the number of screens per array. After 2h of electrocoagulation, 94.5% of initial phenol concentration was removed from the petroleum refinery wastewater. Energy consumption and aluminum Electrode consumption were calculated per gram of phenol removed. The present study shows that, electrocoagulation of phenol using aluminum electrodes is a promising process.
    Journal of hazardous materials 08/2008; 163(2-3):711-6. · 4.14 Impact Factor
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    Nevine Kamal Amin
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    ABSTRACT: Bagasse pith, which is the main waste from sugarcane industry in Egypt, has been used as a raw material for the preparation of different activated carbons. Activated carbons were prepared from bagasse pith by chemical activation with 28% H 3 PO 4 (AC1), 50% ZnCl 2 (AC2) followed by pyrolysis at 600°C and by physical activation at 600°C in absence of air (AC3). Different activated carbons have been used for the removal of reactive orange (RO) dye from aqueous solutions. Batch adsorption experiments were performed as a function of initial dye concentration, contact time, adsorbent dose and pH. Adsorption data were modeled using the Langmuir and Freundlich adsorption isotherms. Adsorption kinetic data were tested using pseudo-first-order, pseudo-second-order and intraparticle diffusion models. Kinetic studies showed that the adsorption followed pseudo-second-order reaction with regard to the intraparticle diffusion rate.
    Desalination. 01/2008; 223:152-161.
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    ABSTRACT: The effective removal of heavy metals from aqueous wastes is among the most important issues for many industrialized countries. Removal of lead (II) and copper (II) from aqueous solutions were studied using pomegranate peel (raw), activated carbon prepared from pomegranate peel (AC 1) and activated carbon prepared from chemically treated pomegranate peel (AC 2 and AC 3). Batch adsorption experiments were performed as a function of pH, contact time, solute concentration and adsorbent dose. The optimum pH required for maximum adsorption were found to be 5.6 and 5.8, for lead and copper respectively. The experimental equilibrium adsorption data are tested for the Langmuir, Freundlich and Temkin equations. Results indicate the following order to fit the isotherms: Langmuir > Temkin > Freundlich in case of lead ions and Freundlich > Temkin > Langmuir in case of copper ions. Adsorption kinetics data were modeled using the pseudo-first and pseudo-second order, Elvoich equations and intra-particle diffusion models. The results indicate that the second-order model best describes adsorption kinetic data.
    Desalination. 01/2008; 223:162-173.
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    ABSTRACT: The present study is concerned with the removal of Cd (II) ions from wastewater by cementation on zinc Raschig rings placed in a rotating basket reactor. The influence of several parameters on the rate of cementation such as initial concentration of cadmium ions, temperature, basket rotation speeds and diameter of zinc rashing rings have been investigated. The rate of cementation was found to increase with increasing bed rotational speed and temperature. On the other hand the rate decreases with increasing the initial cadmium ions concentration in solution and the diameter of zinc Raschig rings. The activation energy was found to be 3.99 kCal/mol. The present reactor proved to be an efficient reactor for cementation reactions in view of its high area per unit volume and its high rate of mass transfer. Rates of cementation which can be expressed in terms of the rate mass transfer were correlated to the controlling parameters by the dimensionless equationSh=0.046Re0.45Sc0.33The present mass transfer data was found to agree with the surface renewal theory.
    Hydrometallurgy 01/2007; 89:224-232. · 2.17 Impact Factor