Article
Chemistry, Multidisciplinary
Aleksandr S. Lozhkomoev, Alexander V. Pervikov, Sergey O. Kazantsev, Konstantin V. Suliz, Roman V. Veselovskiy, Andrey A. Miller, Marat I. Lerner
Summary: This paper investigates the interaction patterns between electroexplosive Co nanoparticles and air oxygen during heating. The characteristics of Co nanoparticles and composite Co/CoO/Co3O4 nanoparticles formed during oxidation were studied using various analytical techniques. It was found that nanoparticles with similar morphology but different composition can be produced by varying oxidation temperatures. The influence of the composition of composite nanoparticles on their magnetic properties was also demonstrated.
Article
Materials Science, Multidisciplinary
Maruthappan Manikandan, Yidan Hu, Kunpeng Cai, Jintao Zhang, Weihao Zhang, Mengmeng Niu, Dongyang Hua, Jun Shang, Xianwei Wang
Summary: In this study, NiO/Co3O4 nanocomposites were synthesized by hydrothermal method and used as electrode materials for electrochemical supercapacitors. The electrochemical performances of NiO/Co3O4 nanocomposites were found to be dependent on their mass ratio, with the 1:1 ratio showing the highest specific capacitance. This investigation offers a useful strategy for developing electrode materials with improved electrochemical performance.
Article
Biotechnology & Applied Microbiology
Bindia Junejo, Qamar A. Solangi, Ali Salman B. Thani, Ismail Murat Palabiyik, Tania Ghumro, Nadia Bano, Amber R. Solangi, Syed Iqleem H. Taqvi
Summary: This study successfully synthesized a series of metal oxide nanoparticles such as cobalt oxide (Co3O4), copper oxide (CuO), nickel oxide (NiO), and zinc oxide (ZnO), and investigated their structural features using various microscopic and spectroscopic techniques. The synthesized nanoparticles showed highly pure and crystalline geometry with sizes ranging between 10 and 20 nm. Furthermore, these nanoparticles exhibited promising pharmacological applications, including significant enzyme inhibition, antioxidant activity, and antimicrobial potential.
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
N. S. Moalej, S. Sheibani, M. Mokmeli
Summary: A ternary NiO/CdO/Co3O4 nanocomposite powder was synthesized by sol-gel method, which showed good distribution of Co3O4 particles and proper contact between different phases. The average particle size was 80 nm and the band gap energy was 2.5 eV. The ternary nanocomposite exhibited a maximum degradation efficiency of 78% for methylene blue dye after 180 min. The mechanism of photodegradation involved holes and hydroxyl radicals. The photocatalyst showed reusability in cyclic degradation experiments.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Orhan Altan
Summary: The effects of g-CN synthesized from different precursors on the photocatalytic efficiency of Schottky junctions were investigated, revealing that the charge transfer dynamics of surface defects are more critical for the photocatalytic performance of Schottky junctions than structural features such as the size of metal nanoparticles or the surface area of the catalysts.
TURKISH JOURNAL OF CHEMISTRY
(2021)
Article
Physics, Multidisciplinary
Mohammad Shariq, Amal BaQais, Talal M. M. Althagafi, Osama Madkhali, Arafa A. A. Alholaisi, Sajad Hussain, Yasir Javed
Summary: Nanospheres of Co3O4, NiO, and their composites (Co3O4/NiO) were prepared by the co-precipitation method and used as supercapacitor electrode materials. The chemical composition of the materials was identified using EDX, while X-ray diffraction was used to determine the crystallite sizes. FTIR was utilized to check the functional groups, and scanning electron microscopy revealed the morphology of the nanospheres. Cyclic voltammetry and galvanostatic charging/discharging were used to investigate the electrochemical properties, finding exceptional specific capacitance, power density, and energy density for the nanocomposite Co3O4/NiO.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Materials Science, Multidisciplinary
Jueun Baek, Yukyung Kim, Kwang Hyeon Baik, Soohwan Jang
Summary: NiO nanopetal film grown by a simple low-cost hydrothermal synthesis method shows high H2S sensing performance. The film has high affinity to H2S adsorption and catalytic activity, exhibiting reliable response to a wide range of H2S concentrations at 400 & DEG;C. It has great potential in applications of chemical, medical, energy, and food industries.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Waseeq Ur Rehman, Muhammad Tayyab Noor Khattak, Abdu Saeed, Kausar Shaheen, Zarbad Shah, Shah Hussain, Esraa M. Bakhsh, Haneen M. Alraddadi, Taghreed M. Fagieh, Kalsoom Akhtar, Sher Bahadar Khan, Shahid Ali Khan
Summary: In this study, a Co3O4/NiO nanocomposite was successfully synthesized as a catalyst for thermal degradation and photodegradation of malachite green dye. The nanocomposite showed small spherical particles with an average size of 52.82 +/- 17.73 nm. XRD pattern and XPS analysis confirmed the formation of the Co3O4/NiO nanocomposite, with Co3O4 and NiO crystal contents of 67.7 +/- 17% and 32.3 +/- 16%, respectively. TGA results demonstrated the thermal stability of the Co3O4/NiO nanocomposite up to 1000 degrees C. It exhibited a optical energy band gap of 4.27 eV and a surface area of 27.4933 m(2)/g. Furthermore, its photocatalytic activity was compared with photolysis and thermocatalytic activity, with photocatalysis showing a significantly higher velocity constant (kapp) value than photolysis.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Waseeq Ur Rehman, Muhammad Tayyab Noor Khattak, Abdu Saeed, Kausar Shaheen, Zarbad Shah, Shah Hussain, Esraa M. Bakhsh, Haneen M. Alraddadi, Taghreed M. Fagieh, Kalsoom Akhtar, Sher Bahadar Khan, Shahid Ali Khan
Summary: A Co3O4/NiO nanocomposite was synthesized for the thermal degradation and photodegradation of malachite green dye. The nanocomposite exhibited small spherical particles with an average size of 52.82±17.73 nm. XRD and XPS analysis confirmed the formation of Co3O4/NiO nanocomposite with proportions of 67.7±17% Co3O4 and 32.3±16% NiO. TGA results showed that the nanocomposite was nearly thermally stable up to 1000°C. Its optical energy band gap was 4.27 eV and the surface area was 27.4933 m2/g. Furthermore, the photocatalytic activity of the nanocomposite was found to be higher than the photolysis activity.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Pedro A. Calderon Bedoya, Pablo M. Botta, Paula G. Bercoff, Maria A. Fanovich
Summary: Iron oxide nanoparticles were successfully prepared via mechanochemical synthesis from three different reactive systems. The study investigated the effects of various iron salts and metallic iron on the properties of the nanoparticles, and determined high magnetization of the obtained iron oxide nanoparticles across a range of temperatures. The presence of metallic iron was found to be crucial in the formation of magnetic phases in the nanoparticles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Zein K. Heiba, Mohamed Bakr Mohamed, M. Abdellatief, Hassan Elshimy, Essam E. Ali, Ali Badawi
Summary: ZnO/(1-x)Co3O4/xNiO/(x = 0.0, 0.3, 0.5, 0.7, 0.9 and 1) samples were prepared using co-precipitation method. Rietveld analysis, XPS and FTIR techniques were used to investigate the phases, structures, microstructures, and ion exchanges in the system. TEM microscopy showed homogeneous spherical particles with nano size. Diffuse reflectance measurements revealed high absorbance in the visible region for samples with x = 0, 0.7, and 1.0, which could be used in coating eyeglasses to protect the skin around the eyes. The optical band gap and refractive index behaviors were influenced by the oxide composition, and the effect of alloying on optical parameters was explored.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Condensed Matter
Ahmad Mustafa, Ibrahim A. Alsafari, H. H. Somaily, Sheraz Yousaf, Muhammad Imran Din, Jameel Rahman, Muhammad Shahid, Muhammad Ashraf, Muhammad Farooq Warsi
Summary: The current study reports the synthesis and characterization of a NiO-Co3O4/rGO nanohybrid for nonenzymatic glucose sensing. The prepared nanohybrid exhibits promising results for glucose sensitivity, with a wide linear response range and low limit of detection, and has the potential to act as a credible sensor for glucose determination.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Biotechnology & Applied Microbiology
Shaimaa A. Mousa, El-Sayed R. El-Sayed, Samar S. Mohamed, Mohamed A. Abo El-Seoud, Adel A. Elmehlawy, Dalia A. M. Abdou
Summary: This study identified a fungal endophyte, Aspergillus terreus, capable of synthesizing multiple types of nanoparticles. Characterization and evaluation of the nanoparticles showed promising antioxidant and antimicrobial activities, highlighting the potential of endophytic fungi as a platform for nanoparticle synthesis.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
A. I. Anu Karthi Swaghatha, L. Cindrella
Summary: A chitosan-based nanocomposite membrane has been developed to improve the proton conductivity and stability for fuel cell applications, achieving a maximum proton conductivity of 44.45 mS cm-1 under partially hydrated conditions at 80 degrees C. The introduction of exfoliated MoS2 nanosheets and magnetically active NiO-Co3O4 as active fillers in the chitosan matrix has shown promising results in enhancing the membrane performance.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Engineering, Environmental
Bindia Junejo, Mujde Eryilmaz, Suna Sibel Rizvanoglu, Ismail Murat Palabiyik, Tania Ghumro, Arfana Mallah, Amber R. R. Solangi, Syed Iqleem Hyder, Hassan Karimi Maleh, Elena Niculina Dragoi
Summary: The resistance to antibiotics has led to an increase in disease-causing infections, especially those caused by pathogens. However, nanotechnology offers a new avenue for creating effective antimicrobial agents. Metal-based nanoparticles have been proven to have strong antibacterial activities, but a comprehensive analysis is still lacking. This study synthesized Co3O4, CuO, NiO, and ZnO nanoparticles and tested their antibacterial activities against different bacteria. ZnO nanoparticles showed the best inhibitory concentration against Staphylococcus epidermidis ATCC12228. The study also examined the biofilm inhibition and antiquorum sensing activities of nanoparticles, demonstrating their potential for bacteria removal from water and wastewater.
WATER SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Applied
Metwally Madkour, Asma A. Ali, Fakhreia Al Sagheer, Ahmed Abdel Nazeer
Summary: Cu2+ doped ZnS nanoparticles were successfully prepared with tunable band gap and increased surface area. Cu2+ acted as electron trapping centers, enhancing photocatalytic activity by inhibiting recombination of photogenerated electron-hole pairs.
Article
Chemistry, Analytical
Entesar Al-Hetlani, Mohamed O. Amin, Metwally Madkour, Bessy D'Cruz
Summary: Pesticides can be harmful to both the environment and humans, often linked to suicide cases. The use of metal ferrites nanoparticles in surface-assisted laser desorption/ionization mass-spectrometry has shown to improve detection sensitivity.
Article
Chemistry, Physical
Metwally Madkour
Summary: In this study, CuxO thin films were successfully prepared using ultrasonic spray pyrolysis with a single coordinated organic source as the precursor. Various operational parameters were investigated, and the precursor and thin films were characterized using multiple techniques. By optimizing the deposition temperature, different compositions of CuxO thin films were obtained, and a heterostructured photocatalyst of CuO/Cu2O thin film exhibited enhanced photocatalytic activity with low recombination rates and improved charge assembly.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Sethumathavan Vadivel, Metwally Madkour, Saravanan Rajendran, Chinnasamy Sengottaiyan
Summary: In this study, Ag2C2O4/Ag@GNS nanocomposite combined with peroxymonosulfate (PMS) was used for the first time to remove bisphenol-A (BiP-A). The nanocomposite exhibited superior photocatalytic performance compared to pure Ag2C2O4 and pure GNS. The experimental results revealed the significant role of O-2-, OH, and SO4- radicals in the photolysis process. The study also investigated the influence of photocatalyst and PMS concentration, pH, and co-existing ions on the BiP-A degradation, and proposed a possible degradation pathway and photocatalytic mechanism.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Khaled M. Chahrour, Poh Choon Ooi, A. M. Eid, Ahmed Abdel Nazeer, Metwally Madkour, Chang Fu Dee, M. F. Mohd Razip Wee, Azrul Azlan Hamzah
Summary: The introduction of crystalline phase change and Ti3+ self-doping improved the electronic conductivity and photoelectrochemical activity of anodic TiO2 nanotubes, enhancing the detection efficiency and selectivity of photoelectrochemical sensors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Amir Ikhlaq, Rahat Javaid, Asia Akram, Umair Yaqub Qazi, Javeria Erfan, Metwally Madkour, Mohamed Elnaiem M. Abdelbagi, Sami M. Ibn Shamsah, Fei Qi
Summary: This study investigated the efficacy of Fe-Z5A in the UV-assisted ozonation process for removing ciprofloxacin in wastewater. The synergic process was found to be more efficient and produced less off-gas ozone compared to other processes. Fe-Z5A operated through a hydroxyl mechanism and showed high efficiency in degrading pharmaceuticals in wastewater.
JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Mohamed F. Nawar, Alaa F. El-Daoushy, Metwally Madkour, Andreas Turler
Summary: This study evaluates the sorption behavior of CeO2 nano-sorbents towards low specific activity (LSA) Mo-99. The results show that HT-1 and CP-2 materials have high sorption capacities and comply with the Elovich and Freundlich models. The diffusion study suggests that the sorption processes can be described by pore diffusion and film diffusion. Moreover, the thermodynamic parameters indicate that the Mo sorption onto both materials is a spontaneous and endothermic process. Thus, these materials have the potential to be used for producing Mo-99/Tc-99m radionuclide generators.
Review
Chemistry, Physical
Zafar Masood, Amir Ikhlaq, Asia Akram, Umair Yaqub Qazi, Osama Shaheen Rizvi, Rahat Javaid, Amira Alazmi, Metwally Madkour, Fei Qi
Summary: The increase in population has led to the introduction of hazardous chemicals into our environment due to industrialization and urbanization. Removing these toxic chemicals from wastewater is critical for maintaining a cleaner and greener environment. Nanotechnology shows promise in effectively treating and cleaning wastewater, but there is a lack of information regarding its applicability and challenges for future applications in wastewater purification. This review paper summarizes recent studies on the use of nanocatalysts for wastewater purification and addresses the issues and challenges for practical implementation.
Article
Chemistry, Physical
Nurhan Ghazal, Shaimaa A. Mohamed, Mohamed Farhat O. Hameed, S. S. A. Obayya, Hossam A. El Nazer, Metwally Madkour
Summary: ZnO/BiVO4/MWCNT nanoheterostructures were prepared as solar active photocatalysts with improved visible light absorption and charge carrier separation, leading to enhanced photocatalytic performance for organic pollutants degradation.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Physical
Mona Arafa, Yasser Abdelmonem, Metwally Madkour
Summary: Binary metal oxide/ternary metal sulphide based nanoheterostructures, such as CuO/Cu2SnS3, were prepared and characterized. The incorporated Cu+/Cu2+ with different ratios were successfully detected. The photocatalytic performance of CuO/Cu2SnS3 was excellent, with a high photodegradation efficiency (90%) for Methylene Blue after 60 min.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Ayman K. El-Sawaf, Metwally Madkour, El Hassane Anouar, El-Sayed A. El-Samanody
Summary: Novel complexes (1-6) of Ni(II), Cu(II), Zn(II), Cd(II), and Pd(II) with the ligand (HL) were synthesized and characterized. The ligand forms neutral thione complexes (2, 4, 5, and 6) with copper(II) chloride, zinc(II) chloride, cadmium(II) chloride, and potassium tetrachloropalladate(II), respectively. Monobasic tridentate complexes (1 and 3) were formed with nickel(II) chloride and copper(II) acetate. Computational studies showed high hyperpolarizability values for the compounds, suggesting their potential use in non-linear optical materials. The metal complexes exhibited stronger antibacterial and antifungal activity compared to the free ligand, with complex 5 showing respectable activity against Gram-positive bacteria and complexes 4 and 5 showing excellent activity against Gram-negative bacteria. Molecular docking revealed higher inhibition efficiency for complexes 1 and 5 compared to the free ligand.
INORGANICA CHIMICA ACTA
(2023)
Article
Chemistry, Applied
Mohammad Hasan, Mayada S. Ali, Metwally Madkour
Summary: In this study, a new chelating agent and its coordinated complexes were prepared and characterized. A one-pot preparation approach for transition metal oxide nanoparticles was developed, allowing for the production of highly pure nanoparticles without the need for washing. The synthesized nanoparticles were evaluated for their photocatalytic activities.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Engineering, Environmental
Entesar Al-Hetlani, Bessy D'Cruz, Mohamed O. Amin, Metwally Madkour
Summary: Activated carbon modified with magnetic nanoadsorbent AC-CoFe2O4 has been proven to be efficient for removing promazine from wastewater, showing high stability and recyclability.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Nurhan Ghazal, Metwally Madkour, Ahmed Abdel Nazeer, S. S. A. Obayya, Shaimaa A. Mohamed
Summary: This paper investigates the electrochemical capacitive performance of thermally evaporated copper iodide thin film doped with different quantities of Al. The results show that aluminum doping increases specific capacitance values, with the CuI-Al electrode containing 7 mol% aluminum exhibiting remarkable long-term cycling stability. The optimized CuI-Al film is proposed as a viable option for supercapacitor applications due to its low-cost production, excellent electrochemical performance, and cycling stability.
Article
Chemistry, Multidisciplinary
Metwally Madkour, Yasser Abdelmonem, Umair Yaqub Qazi, Rahat Javaid, S. Vadivel
Summary: ZnS/SnIn4S8 nanoheterostructures were prepared and used as photocatalysts for the removal of heavy metal chromium (Cr(vi)) pollutants in water, showing high photocatalytic activity in the visible range. The photocatalysts exhibited enhanced charge carrier separation and operated via a step-scheme mechanism, with good recyclability for repeated use.