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Removal of Cu(II),Pb(II),mg(II),and Fe(II) by Adsorption onto Alginate/nanocellulose Beads as Bio-Sorbent

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Journal of Renewable materials 2021年第4期9卷 601-613页

作者： Ragab E.abou-zeid Korany A.Ali Ramadan m.A.Gawad Kholod H.Kamal Samir Kamel Ramzi Khiari Cellulose and Paper Departm.n. National Research CentreGiza12622Egypt Applied Organic Chemistry Departm.n. Center of Excellence for Advanced ScienceNational Research CentreGiza12622Egypt Water Pollution Research Departm.n. national Research Centre Giza12622Egypt Faculty of Sciences of m.n.stir Research Unit of Applied Chemistry and EnvironmentUniversity of MonastirMonastir5019Tunisia Higher Institute of Technological Studies(ISET)of Ksar-Hellal Ksar-Hellal5070Tunisia University of Grenoble Alpes CNRSGrenoble INPLGP2GrenobleF-38000France

Alginate blended with cellulose nanocrystals(CnC),cellulose nanofibers(CnF),and tri-carboxylate cellulose nanofibers(TPC-CnF)prepared and encapsulated in the form of microcapsules(bio-polymeric beads).The cellulosic nanomaterials that used in this study were investigated as nanomaterials for wastewater treatm.n. *** experim.n.s were performed to study the removal of copper,lead,magnesium,and iron from aqueous solutions by the prepared *** effects of the sorbent dosage and the modified polymers on the removing efficiency of the metal cations were *** absorption was used to measure the metal ions *** modified bio-polymeric beads(Alg-CnF,Alg-CnC,and Alg-TPC-CnF)exhibited high-efficiency towards removing of the metal cations;Cu^(2+),Pb^(2+),mg^(2+),and Fe^(2+).The Alg-TPC-CnF composite was exhibited excellent removing efficiency which around 95%for Pb,92%for Cu,43%for Fe and 54%for *** outcomes affirm that the utilization of nanomaterials giving higher adsorption capacities contrasted with similar material in its micro or macrostructure form.

关键词： Biopolymers nanocellulose alginate heavy metal removal wastewater treatm.n.

Superconducting parameter determ.n.tion for (Co0.5Zn0.5Fe2O4)x/Cu0.5Tl0.5-1223 composite

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Journal of Advanced Ceramics 2016年第3期5卷 210-218页

作者： m.mE.BARAKAT n.AL-SAYYED R.AWAD A.I.abou-ALY Physics Departm.n. Faculty of Science Alexandria University Alexandria Egypt Physics Departm.n. Faculty of Science Beirut Arab University Beirut Lebanon

The addition of magnetic Co0.5Zn0.5Fe2O4 nanoparticles to the superconducting Cu0.5Tl0.5-1223 phase has been used to investigate the electrical resistivity behavior of the composite above the superconducting transition temperature Tc. This was studied according to the opening of spin gap and fluctuation conductivity. The results indicated that the pseudogap temperature (T*) and superconducting fluctuation temperature (Tscf) change by increasing the addition of Co0.5Zn0.5Fe2O4 nanoparticles. It was found that T* is related to hole carrier concentration P and it also depends on the antiferromagnetic fluctuation affected by magnetic nanoparticles. The excess-conductivity analysis showed four different fluctuation regions started from high temperature up to Tc, and they were denoted by short wave (sw), two-dim.n.ional (2D), three-dim.n.ional (3D), and critical (cr) fluctuations. The crossover temperature between 3D and 2D (T3D-2D) in the mean field region was decreased by increasing the addition of Co0.5Zn0.5Fe2O4 nanoparticles, in accordance with the decrease in Tscf with x. The coherence length at 0 K along c-axis ξc(0), effective layer thickness of the 2D system d, and inter-layer coupling strength J were estimated as a function of Co0.5Zn0.5Fe2O4 nanoparticle addition. moreover, the thermodynamics, lower and upper critical magnetic fields, as well as critical current density have been calculated from the Ginzburg number nG. It was found that the low concentration of Co0.5Zn0.5Fe2O4 nanoparticles up to x = 0.08 wt% improves the superconducting parameters of Cu0.5Tl0.5-1223 phase. On the contrary, these parameters were deteriorated f

关键词： Co0.5Zn0.5Fe2O4 nanoparticles Cu0.5Tl0.5-1223 phase pseudogap temperature fluctuation conductivity

Flavonoid chemical composition and antidiabetic potential of Brachychiton acerifolius leaves extract

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Asian Pacific Journal of Tropical Biomedicine 2017年第5期7卷 389-396页

作者： Aisha Hussein abou zeid mohamed Ali Farag m.n.l Abdel Aziz Hamed Zeinab Abdel Aziz Kandil Radwa Hassan El-Akad Hanaa mohamed El-Rafie Pharmacognosy Departm.n. National Research Centre Pharmacognosy Departm.n. College of PharmacyCairo University Therapeutic Chemistry Departm.n. National Research Centre

Objective:To evaluate Brachychiton acerifolius leaf extracts as antidiabetic potential agent and to identify the main active constituents using bioactivity guided ***:In vitro antioxidant activity was evaluated for *** different extracts using DPPH assay and vitam.n.C as *** activity was then determ.n.d using STZ-induced rats treated daily with ethyl acetate and 70% ethanol leaf extracts for4 weeks at a dose of 200 g/kg body weight against gliclazide reference *** glucose,a-amylase,lipid profile,liver function enzymes and oxidative stress markers were assessed along with histopathological study for liver and pancreatic *** and structural elucidation of active compounds were made using Diaion and Sephadex followed by spectral ***:The results indicated that ethyl acetate and ethanol leaf extracts exhibited the strongest antioxidant activity compared to that of vitam.n.C(IC500.05,0.03 and 12 mg/m L,respectively).Both extracts showed potent anti-hyperglycemic activity evidenced by a significant decrease in serum glucose levels by 82.5% and 80.9% and a-amylase by45.2% and 53.6%,as compared with gliclazide 68% and 59.4%,*** of ethanol extract resulted in the isolation of 9 flavonoids including apigenin-7-O-arhamnosyl(1/2)-b-D-glucuronide,apigenin-7-O-b-D-glucuronide,apigenin-7-O-b-Dglucoside and ***:This study highlights the potential use of *** leaf extract enriched in flavones for the treatm.n. of diabetes that would warrant further clinical trials investigation.

关键词： STZ-induced diabetes Diaion fractionation Flavonoid glucuronides Brachychiton acerifolius

The effect of multi-intermediate bands on the behavior of an InAs_(1-x)n_x/GaAs(1-y)Sb_y quantum dot solar cell

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Journal of Semiconductors 2015年第4期36卷 1-6页

作者： abou El-maaty m.Aly A.nasr Power Electronics and Energy Conversion Departm.n. ERINRCB College of Computer Qassim University Radiation Engineering Departm.n. NCRRTAtomic Energy Authority

A mathematical model of quantum dot intermediate band solar cells （QDIBSCs） is investigated using two intermediate bands （IBs）. These two IBs arise from the quantum dot （QD） semiconductor material within the bandgap energy. Some parameters such as the width of the QD （WQD） and the barrier thickness or the inter-dot distances between the QDs （BT） are studied to show their influence on the perform.n.e of the QDIBSC. The timeindependent Schr6dinger equation, which is solved using the Kronig-Penney model, is used to determ.n. the posi- tion and bandwidth energies of the two IBs. In our proposed model, the cubic shape of the QDs from InAs0.9n0.1 and the barrier or host semiconductor material from GaAs0.98Sb0.02 are utilized. It is shown from the results obtained that changing the parameters WQD and Bx has more influence on the bandwidth energy for the first IB, A 1, than in the case of the second IB, A2. The optimum power conversion efficiencies （PCEs） of the QDIBSCs with two IBs for the model under study are 58.01% and 73.55% at 1 sun and maximum solar concentration, respectively. One can observe that, in the case of the two IBs, an improvem.n. of the PCE is achieved.

关键词： intermediate bands solar cells quantum dots efficiency solar concentration

Pion emission in α-particle interactions with various targets of nuclear emulsion detector

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Chinese Physics C 2015年第9期39卷 35-42页

作者： A.Abdelsalam Z.abou-moussa n.Rashed B.m.Badawy H.A.Amer W.Osm.n.m.m.El-Ashmawy n.Abdallah Physics Departm.n. Faculty of Science Cairo University mohamed El-nadi High Energy Lab Faculty of Science Cairo University Physics Departm.n. Faculty of Science Fayoum University Reactor Physics Departm.n. Nuclear Research Center Atomic Energy Authority nuclear and Radiological Regulatory Authority NRRA

The behavior of relativistic hadron multiplicity for 4He-nucleus interactions is investigated. The experi- m.n. is carried out at 2.1 A and 3.7 A GeV （Dubna energy） to search for the incident energy effect on the interactions inside different emulsion target nuclei. Data are presented in terms of the number of emitted relativistic hadrons in both forward and backward angular zones. The dependence on the target size is presented. For this purpose the statistical events are discrim.n.ted into groups according to the interactions with H, CnO, Em, and AgBr target nuclei. The separation of events, into the m.n.ioned groups, is executed based on Glauber＇s multiple scattering theory approach. Features suggestive of a decay mechanism seem to be a characteristic of the backward emission of relativistic hadrons. The results strongly support the assumption that the relativistic hadrons may already be emitted during the de-excitation of the excited target nucleus, in a behavior like that of compound-nucleus disintegration. Regarding the limiting fragm.n.ation hypothesis beyond 1 A GeV, the target size is the main parameter affecting the backward production of the relativistic hadron. The incident energy is a principal factor responsible for the forward relativistic hadron production, implying that this system of particle production is a creation system. However, the target size is an effective parameter as well as the projectile size considering the geometrical concept regarded in the nuclear fireball model. The data are analyzed in the framework of the FRITIOF model.

关键词： α-particle interactions at Dubna energies shower particle sources target size dependence FRITIOFmodel

Complete rectal prolapse in young Egyptian males: Is schistosomiasis really condemned?

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World Journal of Gastrointestinal Surgery 2016年第12期8卷 779-783页

作者： Ahmed A abou-zeid Islam H El Abbassy Ahmed m Kamal Dina A Somaie Unit of Colorectal Surgery Department of General Surgery El Demerdash Hospital Ain Shams University

AIm To investigate the assumption that schistosomiasis is the main cause of rectal prolapse in young Egyptian males. mETHODS Twenty-one male patients between ages of 18 and 50 years with complete rectal prolapse were included in the study out of a total 29 patients with rectal prolapse admitted for surgery at Colorectal Surgery Unit, Ain Shams University hospitals between the period of January 2011 and April 2014. Patients were asked to fill out a specifically designed questionnaire about duration of the prolapse, different bowel symptoms and any past or present history of schistosomiasis. Patients also underwent flexible sigmoidoscopy and four quadrant midrectal biopsies docum.n.ing any gross or microscopic rectal pathology. Data from questionnaire and pathology results were analyzed and patients were categorized according to their socioeconomic *** Twelve patients(57%) never contracted schistosomiasis and were never susceptible to the disease, nine patients(43%) had history of the disease but were properly treated. none of the patients had gross rectal polypsand none of the patients had active schistosomiasis on histopathological exam.n.tion. Fifteen patients(71%) had early onset prolapse that started in childhood, majority before the age of 5 years. Thirteen patients(62%) were habitual strainers, and four of them(19%) had straining dating since early childhood. Four patients(19%) stated that prolapse followed a period of straining that ranged between 8 mo and 2 years. nine patients(43%) in the present study came from the low social class, 10 patients(48%) came from the working class and 2 patients(9%) came from the low middle social class. COnCLUSIOn Schistosomiasis should not be considered the main cause of rectal prolapse am.n. young Egyptian males. Childhood prolapse that continues through adult life is likely involved. Childhood prolapse probably results from malnutrition, recurrent parasitic infections and diarrhea that induce straining and prolaps

关键词： Rectal prolapse Schistosomiasis Young Egyptian males Low socioeconomic status Chronic straining

The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurem.n.s

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Journal of Advanced Ceramics 2016年第1期5卷 93-101页

作者： R.AWAD n.H.mOHAmmED A.I.abou ALY S.ISBER H.A.mOTAWEH D.EL-SAID BAKEER m.ROUmI(E) Physics Departm.n. Faculty of Science Alexandria University Alexandria EgyptPhysics Department Faculty of Science Beirut Arab University Lebanon Physics Departm.n. Faculty of Science Alexandria University Alexandria Egypt Physics Departm.n. American University of Beirut Beirut Lebanon Physics Departm.n. Faculty of Science Damanhur University Damanhur Egypt Accelerator Laboratory Lebanese Atomic Energy Commission Beirut Lebanon

Superconductor samples of type (CoFe2O4)xGdBa2Cu3O7-δ (0≤x≤0.1) were synthesized by the conventional solid-state reaction technique, whereas nanosized CoFe2O4 was prepared by co-precipitation method with grain size of about 8.5 nm. The elem.n.al content of the prepared samples was determ.n.d using particle induced X-ray emission (PIXE). The temperature dependence of real (χ’) and imaginary (χ?) components of AC magnetic susceptibility (ACmS) at different magnetic field amplitude (3-15 Oe) was investigated. The analysis of the temperature dependence of ACmS was performed using Bean critical state model. The values of the critical current density J c at T > T p (T p is the inter-granular loss peak temperature) were calculated as a function of magnetic field and nanosized CoFe2O4 content. It was found that the low nanosized CoFe2O4 addition content (x = 0.01) improves the critical current density J c of Gd-123 superconducting phase. The observed variation of J c with temperature indicated that the weak links are changed from superconductor-normal metal-superconductor (SnS) for free sample to superconductor-insulator-superconductor (SIS) type of junctions for samples added with nanosized CoFe2O4 of x > 0.01. We also discussed the experim.n.al results in the framework of the critical state model to estimate the effective volume fraction of the grains f g using Cole-Cole plots.

关键词： Gd-123 phase nanosized CoFe2O4 AC magnetic susceptibility (ACmS) critical current density particle induced X-ray emission (PIXE)

Electrical and mechanical properties of (Bi, Pb)-2223 substituted by holmium

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Journal of Advanced Ceramics 2016年第1期5卷 54-69页

作者： W.ABDEEn S.mARAHBA R.AWAD A.I.abou ALY I.H.IBRAHIm m.mATAR Superconductivity and metallic Glass Lab Physics Department Faculty of ScienceAlexandria University Alexandria EgyptPhysics Department University College at Al-Gamom Umm Al-Qura University Saudi Arabia Physics Departm.n. Faculty of Science Beirut Arab University(BA U) Beirut Lebanon Superconductivity and metallic Glass Lab Physics Department Faculty of ScienceAlexandria University Alexandria Egypt

The effect of the partial substitution of Ca2+ by Ho3+ ions on the electrical and mechanical properties of the superconducting phase (Bi,Pb)-2223 was studied. Superconducting samples of the type (Bi1.8Pb0.4)Sr2Ca2.1?x Ho xCu3.1O10+δ were prepared by solid-state reaction technique under ambient pressure, and characterized by means of X-ray powder diffraction (XRD) and scanning electron microscopy (SEm). The superconducting transition temperature T c and pseudogap temperature T* were estimated from electrical resistivity measurem.n.s, while the critical current density J c was determ.n.d from I-V curves. The electrical resistivity data were discussed according to bipolaron model in the absence of thermally excited individual polarons. The sample with x = 0.025 showed the highest phase volume fraction, T c, and J c. Room temperature Vickers microhardness measurem.n.s were carried out at different applied loads (0.25-5 n) in order to investigate the perform.n.e of the mechanical properties of (Bi1.8Pb0.4)Sr2Ca2.1?x Ho xCu3.1O10+δ phase. It was found that all the samples exhibit normal indentation size effect (ISE). The Vickers microhardness number H V increased as x increased from 0 to 0.025. The experim.n.al results were discussed in view of meyer’s law, Hays-Kendall (HK) approach, elastic/plastic deformation (EPD) model, and proportional specim.n.resistance (PSR) model. The load independent (true) microhardness of (Bi1.8Pb0.4)Sr2Ca2.1?x Ho xCu3.1O10+δ superconducting samples showed identical behavior to that of the PSR model.

关键词： (Bi,Pb)-2223 phase Ho substitution Vickers microhardness bipolaron model pesudogap temperature

Preparation of epoxy resin/rare earth doped alum.n.te nanocomposite toward photolum.n.scent and superhydrophobic transparent woods

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Journal of Rare Earths 2023年第3期41卷 397-405,I0003页

作者： mehrez E.El-naggar Sami Ullah S.Wageh m.A.Abu-Saied Tawfik A.Khattab Dalal Alhashmialameer m.n.l abou Taleb E.A.matter Institute of Textile Research and Technology National Research CenterDokkiCairo16221Egypt Research Center for Advanced materials Science(RCAmS) King Khalid UniversityP.O.Box 9004Abha61413Saudi Arabia Departm.n. of Chemistry College of ScienceKing Khalid UniversityP.O.Box 9004Abha61413Saudi Arabia Departm.n. of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia K.A.CARE Energy Research and Innovation Center King Abdulaziz UniversityJeddah21589Saudi Arabia Polymeric materials Research Departm.n. Advanced Technology and New Materials Research InstituteCity of Scientific Research and Technological Applications(SRTACITY)New Borg El-Arab CityAlexandria21934Saudi Arabia Departm.n. of Chemistry College of ScienceTaif UniversityTaif21944Saudi Arabia Departm.n. of Chemistry College of Science and HumanitiesPrince Sattam Bin Abdulaziz UniversityAl-kharj11942Saudi Arabia Departm.n. of Polymer Chemistry National Center for Radiation Research and Technology(NCRRT)Egyptian Atomic Energy AuthorityNasr CityP.O.Box 7551Cairo11762Egypt Departm.n. of Chemistry Faculty of ScienceDamanhour University22111 DamanhourEgypt

A translucent wooden substrate with long-lasting phosphorescence,high photostability and durability,tough surface,ultraviolet protection,high optical transmittance,and superhydrophobicity was *** long-lasting phosphorescent wooden substrate is able to continue emitting light for extended time ***-modified wood(LmW)was immobilized with a solution of epoxy resin(ER)and rare-earth doped alum.n.te(REDA)phosphor nanoparticles(nPs).For an improved dispersion of pigm.n.,REDA was synthesized in a nanoscale particle size,and characterized by transmission electron microscopy(TEm)to indicate a particle size of 8-14 *** crystal structure of REDA nanoparticles was also proved by X-ray diffraction(XRD).For an improved production of long-persistent phosphorescent colo rless woods,REDA must be well-dispersed in mAA without *** and emissio n,as well as decay and lifetime spectra were *** morphologies of the wooden substrates with different ratios of REDA were investigated by scanning electron microscopy(SEm),X-ray fluorescence(XRF)analysis,Fourier transform infrared spectra(FT-IR),elem.n.al mapping,and energy-dispersion Xray(EDXA).The phosphorescent woods show changes in color from colorless to green under ultraviolet(UV)irradiation,and to yellowish-green in the dark,as proved by the colorimetric parameters of the CIE Lab *** afterglow wood samples display an absorbance band at 365 nm and two phosphorescent bands at 431 and 520 *** UV shielding,photostability,and hydrophobicity were *** increasing REDA ratio,both static contact and slide angles are found to improve in the ranges of147.6°-163.6°and 9°-14°,*** long-lasting photolum.n.scence is optimized at a REDA ratio of 8%.The present strategy shows a large-scale production approach of multiple functional woods for m.n. potential applications,such as smart glow in the dark windows and safety signs.

关键词： Translucent wood Rare-earth doped alum.n.te Superhydrophobic Long-lasting light emission Ultraviolet protection