Ied M. Mnawer, Osama M. Hemeda, Mohamed Y. Hassaan, Ahmed S. Abdel – Moety, Mohamed M. Salem
Nanocrystalline nickel-zinc substituted chromium ferrites having the chemical formula Ni0.6Zn0.4CrxFe2-xO4, i.e., NZCrF (where x= 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 wt.%) have been synthesized by flash auto combustion method. Consequently, preparation and characterization of Ni0.6 Zn0.4Cr0.6 Fe1.4O4 doped Polyvinyl alcohol (PVA)/Rhodamine dye nanocomposites using solvent casting technique have been reported. The X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) studies confirm polymer nanocomposites' formation through the interaction between the nanoparticles and the polymer. Transmission electron microscope (TEM) and scanning electron microscope (SEM) images have investigated surface morphology and particle orientation. The average grain size is estimated to be approximately 51 nm. Images taken with TEM reveal that the composite Ni0.6Zn0.4CrxFe2-xO4/PVA morphology is highly agglomerated, suggesting magnetic nanoparticles are encased in the PVA polymer chains. This may be due to the interaction between the ferrite's oxygen atoms and the PVA's polymer chains. The saturation magnetization (Ms), remnant magnetization (Mr), and coercivity (Hc) measured by VSM have been studied. The modification of PVA/Rhodamine dye nanocomposites with Ni0.6Zn0.4Cr0.6Fe1.4O4 reveals their potential for usage in luminescence applications due to an improvement in the composites' optical characteristics.
{"title":"Influence Of Cr+3 Ions Substitution On The Magnetic And Optical Properties Of Ni-Zn-Cr Ferrite/Pva/ Rhodamine Dye Nanocomposite Film","authors":"Ied M. Mnawer, Osama M. Hemeda, Mohamed Y. Hassaan, Ahmed S. Abdel – Moety, Mohamed M. Salem","doi":"10.58675/2636-3305.1639","DOIUrl":"https://doi.org/10.58675/2636-3305.1639","url":null,"abstract":"Nanocrystalline nickel-zinc substituted chromium ferrites having the chemical formula Ni0.6Zn0.4CrxFe2-xO4, i.e., NZCrF (where x= 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 wt.%) have been synthesized by flash auto combustion method. Consequently, preparation and characterization of Ni0.6 Zn0.4Cr0.6 Fe1.4O4 doped Polyvinyl alcohol (PVA)/Rhodamine dye nanocomposites using solvent casting technique have been reported. The X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) studies confirm polymer nanocomposites' formation through the interaction between the nanoparticles and the polymer. Transmission electron microscope (TEM) and scanning electron microscope (SEM) images have investigated surface morphology and particle orientation. The average grain size is estimated to be approximately 51 nm. Images taken with TEM reveal that the composite Ni0.6Zn0.4CrxFe2-xO4/PVA morphology is highly agglomerated, suggesting magnetic nanoparticles are encased in the PVA polymer chains. This may be due to the interaction between the ferrite's oxygen atoms and the PVA's polymer chains. The saturation magnetization (Ms), remnant magnetization (Mr), and coercivity (Hc) measured by VSM have been studied. The modification of PVA/Rhodamine dye nanocomposites with Ni0.6Zn0.4Cr0.6Fe1.4O4 reveals their potential for usage in luminescence applications due to an improvement in the composites' optical characteristics.","PeriodicalId":7687,"journal":{"name":"Al-Azhar Bulletin of Science","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135007043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mostafa H. Mohamed, Taha M. Elmorsi, H. M. Abdelbary
Using a co-precipitation process, sr-doped ZnO was prepared and demonstrated to be effective in the removal of anionic congo red dye, since its surface positive charge was increased to 17.3 mV. To investigate the surface morphology and physicochemical characteristics of Sr-doped ZnO, FTIR spectroscopy, scanning electron microscopy (SEM), elemental analysis, and point of zero charges (pHPZC) were employed. We conducted batch adsorption experiments to investigate the effects of contact time (180 minutes), pH (3.5–11), adsorbent dosage (0.5–3.0 g L−1), and temperature (288–328 K). The kinetic study was modeled using several equations, including pseudo-firstorder (PFO), pseudo-second-order (PSO), Elovich, and intra-particle diffusion (IPD). For the purpose of describing the adsorption isotherm, Langmuir, Freundlich, and Temkin models were used. A pseudo-second-order model suggests that the adsorption process is chemisorption, which is further confirmed by the Langmuir isotherm model. The maximum capacity ( ) of Sr-doped ZnO for removing CR dye was 71.83 mg/g. At natural pH, the % removal rate of CR dye increased from 13% for pure ZnO (p-ZnO) to 82% for Sr-doped ZnO, where the change in pH significantly increased the removal rate from 7.7% at pH 11 to 92.0% at pH 3.5. The thermodynamic parameters measured at 288, 298, 318, and 328K indicate that the CR dye adsorption occurs spontaneously and endothermically. A significant role is also played by electrostatic interactions in the adsorption of anionic CR dye onto the positive surface of ZnO doped with Sr. This research study highlights the increased surface positivity of Sr-doped ZnO achieved through Sr ion doping. This resulted in a strong attraction to anionic dye molecules like Congo red dye. These findings collectively contribute to advancing the understanding of material-dye interactions and have potential implications for various applications in wastewater treatment and environmental remediation.
采用共沉淀法制备了sr掺杂ZnO，并证明了其对阴离子刚果红染料的去除效果，其表面正电荷增加到17.3 mV。采用红外光谱(FTIR)、扫描电镜(SEM)、元素分析和零电荷点(pHPZC)等方法研究了sr掺杂ZnO的表面形貌和物理化学特性。研究了接触时间(180分钟)、pH(3.5-11)、吸附剂用量(0.5-3.0 g L−1)和温度(288-328 K)对吸附过程的影响，并利用拟一阶(PFO)、拟二阶(PSO)、Elovich和颗粒内扩散(IPD)等动力学方程对吸附过程进行了建模。为了描述吸附等温线，使用了Langmuir, Freundlich和Temkin模型。拟二级吸附模型表明吸附过程为化学吸附，Langmuir等温线模型进一步证实了这一点。sr掺杂ZnO去除CR染料的最大容量为71.83 mg/g。在自然pH下，CR染料的去除率从纯ZnO (p-ZnO)的13%提高到sr掺杂ZnO的82%，其中pH的变化使去除率从pH 11时的7.7%显著提高到pH 3.5时的92.0%。在288,298,318和328K下的热力学参数测量表明，CR染料的吸附是自发和吸热的。静电相互作用对阴离子CR染料在Sr掺杂ZnO正表面的吸附也起着重要作用。本研究强调了Sr离子掺杂提高了Sr掺杂ZnO的表面正电性。这导致了对阴离子染料分子的强烈吸引力，比如刚果红染料。这些发现共同促进了对材料-染料相互作用的理解，并对废水处理和环境修复的各种应用具有潜在的影响。
{"title":"Enhanced Adsorption of Anionic Dyes using Sr-Doped ZnO Nanoparticles: Nonlinear Kinetics and Isotherm Studies","authors":"Mostafa H. Mohamed, Taha M. Elmorsi, H. M. Abdelbary","doi":"10.58675/2636-3305.1654","DOIUrl":"https://doi.org/10.58675/2636-3305.1654","url":null,"abstract":"Using a co-precipitation process, sr-doped ZnO was prepared and demonstrated to be effective in the removal of anionic congo red dye, since its surface positive charge was increased to 17.3 mV. To investigate the surface morphology and physicochemical characteristics of Sr-doped ZnO, FTIR spectroscopy, scanning electron microscopy (SEM), elemental analysis, and point of zero charges (pHPZC) were employed. We conducted batch adsorption experiments to investigate the effects of contact time (180 minutes), pH (3.5–11), adsorbent dosage (0.5–3.0 g L−1), and temperature (288–328 K). The kinetic study was modeled using several equations, including pseudo-firstorder (PFO), pseudo-second-order (PSO), Elovich, and intra-particle diffusion (IPD). For the purpose of describing the adsorption isotherm, Langmuir, Freundlich, and Temkin models were used. A pseudo-second-order model suggests that the adsorption process is chemisorption, which is further confirmed by the Langmuir isotherm model. The maximum capacity ( ) of Sr-doped ZnO for removing CR dye was 71.83 mg/g. At natural pH, the % removal rate of CR dye increased from 13% for pure ZnO (p-ZnO) to 82% for Sr-doped ZnO, where the change in pH significantly increased the removal rate from 7.7% at pH 11 to 92.0% at pH 3.5. The thermodynamic parameters measured at 288, 298, 318, and 328K indicate that the CR dye adsorption occurs spontaneously and endothermically. A significant role is also played by electrostatic interactions in the adsorption of anionic CR dye onto the positive surface of ZnO doped with Sr. This research study highlights the increased surface positivity of Sr-doped ZnO achieved through Sr ion doping. This resulted in a strong attraction to anionic dye molecules like Congo red dye. These findings collectively contribute to advancing the understanding of material-dye interactions and have potential implications for various applications in wastewater treatment and environmental remediation.","PeriodicalId":7687,"journal":{"name":"Al-Azhar Bulletin of Science","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135102132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ahmed F. Koura, Kamal R. Raslan, Khalid K. Ali, Mohamed A. Shaalan
This article presents a detailed numerical study of lockdown (temporal and spatio-temporal) mathematical models for COVID-19. The temporal model proposed in this study comprises a system of five nonlinear ordinary differential equations, while the spatio-temporal model consists of five nonlinear partial differential equations. The reproduction number is discussed as a means to estimate the spread of the COVID-19 pandemic, and sensitivity analysis is performed to highlight the significance of pandemic parameters. Furthermore, the stability regions of the given models, as well as the Von Neumann stability and consistency of the numerical scheme applied to the spatio-temporal model, are investigated. To analyze the numerical results of the presented models under various parameters and facilitate comparison, effective methods such as the central finite difference (CFD) and Runge-Kutta of fifth order (RK-5) are applied. This comprehensive study provides insights into the dynamics and behavior of the COVID-19 pandemic under different scenarios, shedding light on the effectiveness of lockdown measures and the impact of various parameters on the spread of the disease.
{"title":"A numerical study for covid-19 spatio-temporal lockdown model","authors":"Ahmed F. Koura, Kamal R. Raslan, Khalid K. Ali, Mohamed A. Shaalan","doi":"10.58675/2636-3305.1651","DOIUrl":"https://doi.org/10.58675/2636-3305.1651","url":null,"abstract":"This article presents a detailed numerical study of lockdown (temporal and spatio-temporal) mathematical models for COVID-19. The temporal model proposed in this study comprises a system of five nonlinear ordinary differential equations, while the spatio-temporal model consists of five nonlinear partial differential equations. The reproduction number is discussed as a means to estimate the spread of the COVID-19 pandemic, and sensitivity analysis is performed to highlight the significance of pandemic parameters. Furthermore, the stability regions of the given models, as well as the Von Neumann stability and consistency of the numerical scheme applied to the spatio-temporal model, are investigated. To analyze the numerical results of the presented models under various parameters and facilitate comparison, effective methods such as the central finite difference (CFD) and Runge-Kutta of fifth order (RK-5) are applied. This comprehensive study provides insights into the dynamics and behavior of the COVID-19 pandemic under different scenarios, shedding light on the effectiveness of lockdown measures and the impact of various parameters on the spread of the disease.","PeriodicalId":7687,"journal":{"name":"Al-Azhar Bulletin of Science","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136373908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mohamed G. Mansour, Mohamed W. Abd El-Moghny, Ibrahim H. Zidan, Mahmoud M. Hassaan
The present study deals with geological, mineralogical and geochemical studies of the Upper Cretaceous Duwi Formation bearing phosphorites and its radioactivity at east Mahameid area, Nile Valley, Egypt. In the studied area, 100 boreholes were drilled in three sectors; Abu Sabona (A); Araby (B); and EI- Mallaha (C). The selected core samples have been described to illustrate the stratigraphic succession of the investigated area. Thirty phosphorite samples were studies petrographically and analyzed chemically. The chemical analyses carried out at the Labs of Nuclear Materials Authority (NMA). The obtained data revealed the formation of the Lower Phosphorite Member as isolated lenticular bodies. The Lower Phosphorites Member is deposited in shallower epicontenental marine environment than the upper one. The abnormal concentration of Cr, Ni favor their ultramafic –mafic source rock. The slight difference in cU and eU with increasing in cU contents in most samples relative to eU, could be connected to recent uranium migration from the upper black shale of the Dakhla Formation.
{"title":"CHARACTERIZATION, AND POTENTIAL OF SUBSURFACE PHOSPHORITE BEARING URANIUM AT EAST MAHAMEID REGION, EGYPT","authors":"Mohamed G. Mansour, Mohamed W. Abd El-Moghny, Ibrahim H. Zidan, Mahmoud M. Hassaan","doi":"10.58675/2636-3305.1644","DOIUrl":"https://doi.org/10.58675/2636-3305.1644","url":null,"abstract":"The present study deals with geological, mineralogical and geochemical studies of the Upper Cretaceous Duwi Formation bearing phosphorites and its radioactivity at east Mahameid area, Nile Valley, Egypt. In the studied area, 100 boreholes were drilled in three sectors; Abu Sabona (A); Araby (B); and EI- Mallaha (C). The selected core samples have been described to illustrate the stratigraphic succession of the investigated area. Thirty phosphorite samples were studies petrographically and analyzed chemically. The chemical analyses carried out at the Labs of Nuclear Materials Authority (NMA). The obtained data revealed the formation of the Lower Phosphorite Member as isolated lenticular bodies. The Lower Phosphorites Member is deposited in shallower epicontenental marine environment than the upper one. The abnormal concentration of Cr, Ni favor their ultramafic –mafic source rock. The slight difference in cU and eU with increasing in cU contents in most samples relative to eU, could be connected to recent uranium migration from the upper black shale of the Dakhla Formation.","PeriodicalId":7687,"journal":{"name":"Al-Azhar Bulletin of Science","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136373931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-25DOI: 10.21608/absb.2022.159051.1205
I. Mnawer, O. Hemeda, M. Hassaan, A. Abdel-Moety, M. Salem
{"title":"Influence of Cr+3 ions substitution on the magnetic and optical properties of NiZnCr Ferrite/PVA/Rhodamine dye nanocomposite film","authors":"I. Mnawer, O. Hemeda, M. Hassaan, A. Abdel-Moety, M. Salem","doi":"10.21608/absb.2022.159051.1205","DOIUrl":"https://doi.org/10.21608/absb.2022.159051.1205","url":null,"abstract":"","PeriodicalId":7687,"journal":{"name":"Al-Azhar Bulletin of Science","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89570658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-07DOI: 10.21608/absb.2022.149409.1197
R. Mawad, H. Madbouly, E. Ghamry, Ehab Mahdy
{"title":"Solar activity cycles recur epidemic and pandemic viruses: Space weather’s alerts","authors":"R. Mawad, H. Madbouly, E. Ghamry, Ehab Mahdy","doi":"10.21608/absb.2022.149409.1197","DOIUrl":"https://doi.org/10.21608/absb.2022.149409.1197","url":null,"abstract":"","PeriodicalId":7687,"journal":{"name":"Al-Azhar Bulletin of Science","volume":"98 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76151921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-29DOI: 10.21608/absb.2022.144086.1193
H. Kamel
{"title":"A COMPARATIVE STUDY ON TWO HYBRIDS OF SILKWORM BOMBYX MORI (L.) REARED ON MULBERRY LEAVES MORUS ALBA VAR. KANAVA-2.","authors":"H. Kamel","doi":"10.21608/absb.2022.144086.1193","DOIUrl":"https://doi.org/10.21608/absb.2022.144086.1193","url":null,"abstract":"","PeriodicalId":7687,"journal":{"name":"Al-Azhar Bulletin of Science","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90216160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-25DOI: 10.21608/absb.2022.136502.1182
F. Arafa, T. Abdelhafeez, M. Mohamed
{"title":"Reservoir Characterization of The Bahariya Formation Using Core analysis and Well logging Integration at Al Zahraa Field, North Western Desert, Egypt","authors":"F. Arafa, T. Abdelhafeez, M. Mohamed","doi":"10.21608/absb.2022.136502.1182","DOIUrl":"https://doi.org/10.21608/absb.2022.136502.1182","url":null,"abstract":"","PeriodicalId":7687,"journal":{"name":"Al-Azhar Bulletin of Science","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79537461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-10DOI: 10.21608/absb.2022.151322.1198
S. Makharesh, H. El-Owaidy, A. El-Deeb
{"title":"Some generalizations of reverse Hardy-type inequalities via Jensen integral inequality on time scales","authors":"S. Makharesh, H. El-Owaidy, A. El-Deeb","doi":"10.21608/absb.2022.151322.1198","DOIUrl":"https://doi.org/10.21608/absb.2022.151322.1198","url":null,"abstract":"","PeriodicalId":7687,"journal":{"name":"Al-Azhar Bulletin of Science","volume":"145 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77520154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-08-09DOI: 10.21608/absb.2022.136571.1183
M. Musa, T. Abdelhafeez, A. Saad
{"title":"Treatment of Failure Vulnerability Section Quattamiya - Sokhna Highway Road through Integrated Geophysical and Geotechnical Studies","authors":"M. Musa, T. Abdelhafeez, A. Saad","doi":"10.21608/absb.2022.136571.1183","DOIUrl":"https://doi.org/10.21608/absb.2022.136571.1183","url":null,"abstract":"","PeriodicalId":7687,"journal":{"name":"Al-Azhar Bulletin of Science","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77830673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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