S.s. Metwally

• Ph.D.
• Professor at Egyptian Atomic Energy Authority

The feasibility of using nano-cryptomelane for elimination of cobalt and cesium metal ions from their single and binary solutions was studied. In this respect, the material was prepared and characterized to confirm its chemical composition and structure. Results illustrate that the synthesized nano-cryptomelane has a tunnel structure with particle...

Surface modification of ball clay was produced by gamma irradiation of a mixture containing ball clay (BC), acrylic acid (AA), phosphoric acid (PA), and N,N`-methylenebisacrylamide (DAM) solution to produce a composite sorbent (BC-AA-PA). Both BC and BC-AA-PA composite were characterized using SEM, FT-IR, XRD, and XRF. Comparative evaluation of bot...

Application of fixed bed column for separation of gadolinium and neodymium ions from their aqueous solutions using cyphos IL-104 impregnated silica was investigated. The performance of separation of the two lanthanide elements was evaluated by determining the column capacity, the total quantity sorbed of metal ions, and the removal percentage. Thes...

The last step in any radioactive waste management practice is the disposal activity which is designed to ensure isolation of these wastes under controlled conditions over extended time scale. Current designs of radioactive waste disposal facilities rely on the containment and confinement strategy through the use of multi-barrier concept in which en...

Radionuclide sorption by natural and modified clays is extensively accepted to be an important process from the radioactive waste point of view. This work focused on modification of natural attapulgite with a layered double hydroxide to produce a novel chemisorbent for Sr2+, Ni2+, and Co2+ removal from multicomponent solution. The structural and su...

Modification of perlite using nano-magnetic iron oxide was implemented to produce nano-magnetic Fe3O4-coated perlite composite (Fe3O4/Perlite). The prepared composite was characterized using Scanning Electron Microscopy, Fourier-Transform Infrared spectroscopy and Powder X-ray Fluorescence. The potentiality of both perlite and Fe3O4/Perlite composi...

The negatively charged surface of chabazite reduces its efficiency for the sorption of anionic species of radionuclides due to the repulsion force between the anionic species and the negative charge of chabazite surface. Therefore, this work focused on the modification of chabazite using N-methylene aniline to produce Ch-NMA composite for the sorpt...

Encapsulation of nano-sized iron(III)–titanium(IV) mixed oxide was achieved using sodium alginate to produce encapsulated Fe–O–Ti beads for the removal of Co(II), Cd(II), and Ni(II) from multicomponent solution using fixed-bed column. The column performance was 57.6, 49.2, and 34.0% for Ni(II), Co(II), and Cd(II), respectively. The breakthrough cur...

Polyaniline/zirconium aluminate composite (PANI/ZAl) was synthesized as a novel sorbent by sol-gel hydrolysis method and characterized using Fourier Transform Infrared Spectra, Scanning Electron Microscope, X-ray Diffraction, Differential Thermal Analysis and Thermal Gravimetric Analysis. Sorption of ¹⁵²⁺¹⁵⁴ Eu and ⁶⁰ Co radionuclides were achieved...

Ion exchange technique is one of the widely applied conventional treatment options in nuclear industry, which is used to reduce the volume of aqueous radioactive waste streams, to separate isotopes and in decontamination operations. After being exhausted, spent exchangers are considered as radioactive waste and consequently they must be safely mana...

Fixed-bed column was employed for the dismissal of strontium, cesium, and lead cations by the waste of brick kiln as a low-cost adsorbent. Brick kiln waste was characterized using Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), Thermal Gravimetric Analysis (TGA) & Differential Thermal Analysis (DTA), and parti...

The radiological and elemental hazards indices of phosphate fertilizers and phosphogypsum waste were investigated by determination of their components concentration using Instrumental Neutron Activation Analysis (INAA) then comparing the resultant concentrations with the acceptable limit. The radioactivity of ⁴⁰K, ²³²Th and ²³⁸U within the samples...

For long-term performance evaluation of radioactive waste repositories, knowledge about the radionuclides adsorption by backfill materials is required. As a part of the multi-barrier system for effective isolation of radioactive waste in a repository, alum industrial waste was evaluated to be utilized as a backfill material. In this concern, the ad...

Nano-cryptomelane was prepared and characterized using SEM with mapping, HRTEM, FT-IR spectra, thermal analysis and surface area. The diameter distribution of nano-cryptomelane was found to be 4-6 nm. Sorption performance of the prepared material was studied for the removal of Co2+, Cs+and Pb2+from a multi-system solution of equal molar ratio, 1:1:...

Gamma radiation polymerization method was used for the modification of kaolin to produce (poly acrylamide-acrylic acid)-Kaolin (PAM-AA-K). Monazite ore is one of the main resources of uranium and lanthanide elements, therefore, this work focused on sorption of uranium, lanthanum and europium ions from low grade monazite leachate. The removal percen...

Molybdenum is a vital element in the industry and biological systems, and for environmental protection, it is needed to remove molybdenum ion from the wastewater. Therefore, this work focused on removal and separation of molybdenum ion from some fission products such as La(III), Eu(III), Ce(IV) and Y(III) ions. For this purpose, perlite was impregn...

Ion exchange technique is one of the widely applied conventional treatment options in nuclear industry, which is used to reduce the volume of aqueous radioactive waste streams, to separate isotopes and in decontamination operations. After being exhausted, spent exchangers are considered as radioactive waste and consequently they must be safely mana...

Impregnation of trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate, as an ionic liquid, into silica was carried out for removal of neodymium and gadolinium ions from aqueous solution. Silica and the impregnated silica (Cyphos@silica) were characterized using FT-IR, SEM, XRD and TGA. Comparative sorption behavior of silica and Cyp...

Hydroxyapatite-cobalt(II) ferrocyanide, HAFC, was prepared, characterized and used for removal of strontium and cesium ions from aqueous solution. Comparative studies on modified and unmodified hydroxyapatite for sorption of both ions were carried out to evaluate the modification process. The sorption process is controlled by an ion exchange mechan...

Hydroxyapatite-cobalt(II) ferrocyanide, HAFC, was prepared, characterized and used for removal of strontium and cesium ions from aqueous solution. Comparative studies on modified and unmodified hydroxyapatite for sorption of both ions were carried out to evaluate the modification process. The sorption process is controlled by an ion exchange mechan...

Nano-birnessite was prepared, characterized and used for removal of cobalt and strontium ions from aqueous solutions. Scanning electron microscope and atomic force microscope images indicated that the particles of the prepared material are presented in the nano-scale form, the grain size was found in a range of 58–95 nm. Specific surface area of th...

Green composites emphasize renewable starting materials for better economy using biomass materials. Therefore, low-cost composite biosorbent was prepared by modification of eggshell material using heteropoly acid for removal of strontium ions from aqueous solution. The resulted composite was characterized and evaluated for the sorption process usin...

Silica-based urea-formaldehyde (SiO2/UF) composite material was prepared and impregnated with organophosphorus extractant, namely; 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester, for removal of Eu3+ and Nd3+ from aqueous solutions. The sorption capacity of the impregnated SiO2/UF for Eu3+ and Nd3+ were determined and found to be 3.1 and 2.8 me...

Most of the procedures developed for the extraction of cobalt, strontium and cesium by solid phase extraction do not employ simultaneous extraction of them. In this study, rapid simultaneous removal of Co2+, Sr2+ and Cs+ on microcrystalline naphthalene as solid-phase extractant was investigated. These ions were allowed to form chelates with oxine a...

Nano-structured iron(III)–titanium(IV) mixed oxide, Fe–O–Ti, was prepared by co-precipitation technique and characterized using Transmission Electron Microscopy, Fourier Transform Infra Red, Energy Dispersive X-ray spectroscopy, and Thermal Analysis. The particle size of the prepared material was found to be 10–15 nm. The sorptive potential of nano...

Eggshell material was used as low-cost and eco-friendly biosorbent for removal of 134Cs, 60Co and 152+154Eu radionuclides from aqueous solution. The eggshell material was calcined at 500 and 800 °C, and then characterized. Comparative studies on the natural and calcined eggshell for sorption of the three radionuclides were carried out. It was found...

Nanostructured composite sorbent of Mg/Al-aminobenzoate layered double hydroxide was prepared by coprecipitation method. The particle size of the nanocomposite was found to be 10-20 nm. Sorption performance of the prepared material was studied for removal of cobalt ion from aqueous solution. The percent uptake of cobalt ion was found to be 96.1%. T...

Adsorptive competition between uranium (VI) and humic acids (HA) was investigated using Rice Straw activated carbon modified with KOH (RSK carbon). The investigations were conducted for individual components adsorption along with simultaneous and sequential adsorption of both components. The experimental results showed that the equilibrium data fit...

Extraction of Cu2+ ion from ammoniacal solution by solvent impregnated resin was investigated. Amberlite XAD-7 was used as a polymeric support for impregnation with LIX-54. The extraction of copper was carried out at different extraction time, pH of medium, extractant concentration, resin weight, volume of metal ion solution, concentration of ammon...

Ion exchange behavior of some heavy metal ions, Pb2þ, Ni2þ, and Cd2þ, onto amidoximated polyacrylonitrile based Ce(IV) phosphate was investigated. Polyacrylonitrile based Ce(IV) phosphate was prepared and followed by functionalization of the cyano group to amidoxime group with hydroxylamine. The amidoximated resin was characterized using FT-IR and...

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Inexpensive and eco-friendly sorbent, marble dust, has been successfully utilized for the removal of some organic pollutants from aqueous solutions. The excessive release of organics into the environment is a major concern worldwide. Therefore, adsorption of methylene blue (MB), as an organic pollutant, onto low cost adsorbent from aqueous solution...

Kinetic and equilibrium models were navigated for sorption of Cs+, Co2+, and Eu3+ ions from their aqueous solutions by poly-acrylonitrile-based Ce(IV) phosphate. Pseudo-first order, pseudo-second order, intra-particle diffusion, and Boyed rate expressions were used to determine the suitable sorption pathway, in addition to their verification using...

Removal of cesium, cobalt, and europium ions from radioactive waste solutions using poly-acrylamide based Ce(IV) phosphate material was investigated using both batch and fixed bed column techniques. The effect of pH, initial metal ion concentration, and temperature had been studied. Simple kinetic and thermodynamic models had been applied from whic...

Zeolite X was prepared and evaluated for the removal of Cs+, Sr2+ and Co2+ ions from multicomponent ionic system. The physical characteristics of the prepared material were studied using X-ray diffraction patterns (XRD) and scanning electron microscope (SEM). Cation hydrolysis at different pH values was examined using visual MINTEQA2 computer progr...