Al-Azhar Bulletin of Science最新文献_第3页

Influence Of Cr+3 Ions Substitution On The Magnetic And Optical Properties Of Ni-Zn-Cr Ferrite/Pva/ Rhodamine Dye Nanocomposite Film Cr+3离子取代对Ni-Zn-Cr铁氧体/Pva/罗丹明染料纳米复合膜磁性和光学性能的影响

Al-Azhar Bulletin of Science Pub Date : 2023-01-01 DOI: 10.58675/2636-3305.1639

Ied M. Mnawer, Osama M. Hemeda, Mohamed Y. Hassaan, Ahmed S. Abdel – Moety, Mohamed M. Salem

{"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}

引用次数: 0

Enhanced Adsorption of Anionic Dyes using Sr-Doped ZnO Nanoparticles: Nonlinear Kinetics and Isotherm Studies sr掺杂ZnO纳米粒子增强阴离子染料的吸附:非线性动力学和等温线研究

Al-Azhar Bulletin of Science Pub Date : 2023-01-01 DOI: 10.58675/2636-3305.1654

Mostafa H. Mohamed, Taha M. Elmorsi, H. M. Abdelbary

{"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}

引用次数: 0

A numerical study for covid-19 spatio-temporal lockdown model covid-19时空封锁模型的数值研究

Al-Azhar Bulletin of Science Pub Date : 2023-01-01 DOI: 10.58675/2636-3305.1651

Ahmed F. Koura, Kamal R. Raslan, Khalid K. Ali, Mohamed A. Shaalan

{"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}

引用次数: 0

CHARACTERIZATION, AND POTENTIAL OF SUBSURFACE PHOSPHORITE BEARING URANIUM AT EAST MAHAMEID REGION, EGYPT 埃及东部mahameid地区地下含铀磷矿特征及潜力

Al-Azhar Bulletin of Science Pub Date : 2023-01-01 DOI: 10.58675/2636-3305.1644

Mohamed G. Mansour, Mohamed W. Abd El-Moghny, Ibrahim H. Zidan, Mahmoud M. Hassaan

引用次数: 0

Influence of Cr+3 ions substitution on the magnetic and optical properties of NiZnCr Ferrite/PVA/Rhodamine dye nanocomposite film Cr+3离子取代对NiZnCr铁氧体/PVA/罗丹明染料纳米复合膜磁性和光学性能的影响

Al-Azhar Bulletin of Science Pub Date : 2022-09-25 DOI: 10.21608/absb.2022.159051.1205

I. Mnawer, O. Hemeda, M. Hassaan, A. Abdel-Moety, M. Salem

引用次数: 0

Solar activity cycles recur epidemic and pandemic viruses: Space weather’s alerts 太阳活动周期重现流行病和大流行性病毒:空间天气警报

Al-Azhar Bulletin of Science Pub Date : 2022-09-07 DOI: 10.21608/absb.2022.149409.1197

R. Mawad, H. Madbouly, E. Ghamry, Ehab Mahdy

引用次数: 0

A COMPARATIVE STUDY ON TWO HYBRIDS OF SILKWORM BOMBYX MORI (L.) REARED ON MULBERRY LEAVES MORUS ALBA VAR. KANAVA-2. 家蚕两种杂交种的比较研究以桑叶为食，桑叶是morus alba var. kanava-2。

Al-Azhar Bulletin of Science Pub Date : 2022-08-29 DOI: 10.21608/absb.2022.144086.1193

H. Kamel

引用次数: 0

Reservoir Characterization of The Bahariya Formation Using Core analysis and Well logging Integration at Al Zahraa Field, North Western Desert, Egypt 基于岩心分析和测井综合的埃及Al Zahraa油田Bahariya组储层表征

Al-Azhar Bulletin of Science Pub Date : 2022-08-25 DOI: 10.21608/absb.2022.136502.1182

F. Arafa, T. Abdelhafeez, M. Mohamed

引用次数: 0

Some generalizations of reverse Hardy-type inequalities via Jensen integral inequality on time scales 利用时间尺度上的Jensen积分不等式对逆hardy型不等式的一些推广

Al-Azhar Bulletin of Science Pub Date : 2022-08-10 DOI: 10.21608/absb.2022.151322.1198

S. Makharesh, H. El-Owaidy, A. El-Deeb

引用次数: 0

Treatment of Failure Vulnerability Section Quattamiya - Sokhna Highway Road through Integrated Geophysical and Geotechnical Studies 基于综合地球物理和岩土工程研究的夸塔米亚-索赫纳高速公路破坏易损性路段处理

Al-Azhar Bulletin of Science Pub Date : 2022-08-09 DOI: 10.21608/absb.2022.136571.1183

M. Musa, T. Abdelhafeez, A. Saad

引用次数: 0