Article
Engineering, Environmental
Ayelen F. Crespi, Paula N. Zomero, Ana L. Perez, Carlos D. Brondino, Antonia Infantes Molina, Yamila Garro Linck, Gustavo A. Monti, Mariela A. Fernandez, Enrique Rodriguez-Castellon, Juan M. Lazaro-Martinez
Summary: The aim of this study was to propose the use of new heterogeneous catalysts based on montmorillonite materials to remove emerging pollutants. The catalytic activity of the composites was demonstrated by their ability to degrade pollutants and produce non-toxic waste.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Mohamed M. Ibrahim, Shaban Y. Shaban, Ahmed A. Amer, Soha F. Mohamed, Ahmed M. Fathy, Sami A. Al-Harbi, Abd El-Motaleb M. Ramadan
Summary: Four mononuclear penta-coordinated copper(II) chelates containing pyridine-2,6-diimine ligands were prepared using the template technique. Characterization of the metal chelates was done using analytical and physicochemical methods, revealing the impact of ligand substituents on the Lewis acidity of copper(II) centers. Study on ligand substitution and catalytic activity of oxidase mimics showed promising results. The research also delved into the kinetics of oxidation processes and discussed proposed catalytic reaction pathways based on the findings.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2022)
Article
Chemistry, Physical
Giulia Forghieri, Danny Zanardo, Elena Ghedini, Federica Menegazzo, Alessia Giordana, Giuseppina Cerrato, Alessandro Di Michele, Giuseppe Cruciani, Michela Signoretto
Summary: The study aimed to evaluate the photocatalytic performance of earth-abundant wide-bandgap semiconductors by coupling ZnO and TiO2 with low contents of the rare-earth Ce species, with the Zn-based samples showing suitability for the photo-oxidation of organic pollutants.
Article
Materials Science, Ceramics
A. Eisinas, T. Dambrauskas
Summary: The objective of this study was to synthesize calcium silicate hydrates in dense samples and apply them for copper ion adsorption and oxidation catalyst for volatile organic compounds. Different mineralogical compositions, density, and compressive strength were observed in samples synthesized for different durations. Calcium silicate hydrates synthesized in dense samples could effectively remove copper ions from liquid medium, while the efficiency depended on the properties of the medium and synthesis duration. The synthetic samples combined with copper ions exhibited catalytic activity for methanol oxidation.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Xiaopeng Li, Hongping Zhang, Haifei Zhan, Youhong Tang
Summary: In this study, the effects of three different dopants (Mg, Sr, and Ba) on the structure of C-S-H-tobermorite were investigated using DFT calculations. The results showed that Mg doping led to a decrease in lattice volume and significant changes in the structure and coordination of magnesium-oxygen polyhedra. On the other hand, Sr and Ba doping only increased the volume of the respective oxygen polyhedra. Despite distorting the structure, Mg doping improved the compressive and shear resistance of tobermorillonite, while having less effect on the anisotropy of the Young's modulus. The findings suggest that Mg doping is a promising approach for optimizing the structural design of C-S-H.
Article
Chemistry, Physical
Najwa Binti Hamzan, Min Kai Lee, Lieh-Jeng Chang, Keat Hoe Yeoh, Khian-Hooi Chew, Manoj Tripathi, Alan Dalton, Boon Tong Goh
Summary: This study investigates the structural, electronic, and magnetic properties of MnSi and Mn4Si7 nanowires grown by thermal chemical vapor deposition. The MnSi nanowires remained ferromagnetic, while the Mn4Si7 nanowires exhibited an ferromagnetic order, in contrast to the non-magnetic nature of bulk Mn4Si7. Theoretical calculations confirmed that both MnSi and Mn4Si7 nanowires possess metallic characteristics. These findings suggest the possibility of tuning the phase evolution of Si-based nanowires for nanoscale technologies.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Yuezhen He, Manyue Yin, Jian Sun, Jie Chen, Kuimin Jiao, Jiantao Wen, Yan Chen, Baojuan Wang, Feng Gao, Lun Wang
Summary: Luminescent Cu@Cu2S nanozymes with high peroxidase-like and oxidase-like activity were prepared by a one-pot method. Fluorescence imaging showed that these nanozymes adhered to the surface of bacterial cells, and scanning electron microscopy revealed that the nanomaterials caused folding and collapse of the bacterial surface, resulting in bacterial death.
CHEMICAL COMMUNICATIONS
(2022)
Article
Engineering, Biomedical
Qiang Wu, Shunxiang Xu, Xin Wang, Bo Jia, Yu Han, Yifu Zhuang, Ye Sun, Zhenyu Sun, Yaping Guo, Huamin Kou, Congqin Ning, Kerong Dai
Summary: Cu-CPS ceramics improved bone and vessel regeneration through the simultaneous effects of copper and silicon, offering a promising treatment option in orthopedic application for bone tissue regeneration.
Article
Chemistry, Physical
T. Dambrauskas, D. Davidoviciene, A. Eisinas, K. Baltakys
Summary: This study investigated the properties and catalytic activity of calcium silicate hydrates with copper oxide. The catalyst was synthesized using the hydrothermal method. The results showed that a mixture of copper oxide and semicrystalline calcium silicate hydrates was obtained. The synthesized mesoporous sample exhibited a significantly high specific surface area and promising catalytic performance.
SURFACES AND INTERFACES
(2023)
Article
Biochemistry & Molecular Biology
Justyna Sulowska, Dominika Madej, Bartlomiej Pokrzywka, Magdalena Szumera, Andrzej Kruk
Summary: A series of silicate-phosphate glass materials were synthesized from the SiO2-P2O5-K2O-MgO system, with and without doping of sulfur ions, using activated carbon as a reducer. The glass composition, homogeneity, structural and optical properties were confirmed through various spectroscopic and microscopic techniques, highlighting changes in the silicate-phosphate networks caused by sulfur doping. The emission characteristics of the glass samples under UV excitation were studied, showing a wide spectrum of luminescence, with a peak around 700 nm, depending on the glass composition and laser-processing parameters.
Article
Chemistry, Applied
Nesrin Bugday, Sedat Yasar, Serdar Altin, Ozgur Duygulu, Yunus Onal
Summary: A novel magnetic nanoporous carbon composite (Cu/Co@NPC) material, synthesized by calcining copper-doped amorphous zeolitic imidazolate framework (Cu/Co@aZIF), was used as an efficient catalyst for azide-alkyne cycloaddition (AAC) reaction and reduction reaction of nitrophenol (RRN) under air in water. Excellent yields of related products were synthesized in a short reaction time using this recyclable Cu/Co@NPC nanocatalyst, which showed a slight decrease in catalytic efficiency of 6% and 22% in RRN and AAC reactions, respectively.
APPLIED ORGANOMETALLIC CHEMISTRY
(2023)
Article
Engineering, Chemical
Jan Mrazek, Sandip Bysakh, Roman Skala, Ales Mracek, Anirban Dhar, Ivo Barton, Ivan Kasik
Summary: A versatile sol-gel approach is presented for the synthesis of nanocrystalline (Eu0.5Y0.5)(2)Ti2O7. The crystallization kinetics, nucleation mechanism, and crystal structure were studied. The results showed a regular distribution of Eu3+ and Y3+ ions and provided key information for tailoring the structural properties of nanocrystalline powders for photonic applications.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Biophysics
Muhammad Bilal, Nida Khaliq, Mubeen Ashraf, Nazim Hussain, Zulqarnain Baqar, Jakub Zdarta, Teofil Jesionowski, Hafiz M. N. Iqbal
Summary: Nanozymes are efficient nanomaterials with enzyme-like characteristics, which have attracted researchers' attention as alternatives to natural enzymes. Despite their unique physicochemical properties and catalytic activity, constraints such as denaturation, high manufacturing cost, and reutilization challenges have hindered their deployment in industrial processes. The article provides an overview of nanozyme research, compares them with natural and synthetic enzymes, and highlights their distinct properties and applications in various fields, introducing a new field called nanozymology.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2023)
Article
Materials Science, Ceramics
Monika Backhaus-Ricoult, Monique Comte, Eric Francois, Aram Rezikyan, Bryan Wheaton
Summary: Structural, chemical, and microstructural changes in lithium aluminum silicate glass during ceramming are studied using in-situ impedance spectroscopy, X-ray diffraction and transmission electron microscopy. The evolution of the glass' electric and dielectric properties during ceramming is observed. The study reveals that nuclei form by de-mixing and phase separation of the glass, leading to the development of distinct interfaces and ion mobility in the crystalline phase over time.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Carmen Gherasim, Petronela Pascariu, Mihai Asandulesa, Marius Dobromir, Florica Doroftei, Nicusor Fifere, Andrei Dascalu, Anton Airinei
Summary: In this study, cupric oxide nanoparticles were prepared using a convenient chemical precipitation route. The effect of reaction conditions on the formation of CuO nanoparticles was investigated. The structural, morphological, optical, and electrical properties of the CuO nanostructures were analyzed using various techniques. Additionally, the photocatalytic activity of the CuO nanoparticles was studied.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Isabel Rodriguez-Garcia, Dmitry Galyamin, Laura Pascual, Pilar Ferrer, Miguel A. Pena, Dave Grinter, Georg Held, Mohamed Abdel Salam, Mohamed Mokhtar, Katabathini Narasimharao, Maria Retuerto, Sergio Rojas
Summary: This study demonstrates that the OER activity and durability of SrRuO3 mixed oxide can be enhanced by partial doping with K+ cations. The doping led to Ru atoms in a higher oxidation state and perovskites with slightly higher symmetry. The K-doped materials showed higher activity and durability, suggesting that chemical modifications can improve the stability of Ru phases during the OER.
JOURNAL OF POWER SOURCES
(2022)
Article
Materials Science, Multidisciplinary
Katabathini Narasimharao, Shaeel Al-Thabaiti, Hament Kumar Rajor, Mohamed Mokhtar, Abdulmohsen Alsheshri, Sulaiman Yahya Alfaifi, Noufal Komby Abdulla, Sharf Ilahi Siddiqui
Summary: This study describes the synthesis and utilization of Fe3O4@date seeds powder as an adsorbent for removing methylene blue from water. The Fe3O4 nanoparticles were grown on date seeds powder using a simple co-precipitation method. The prepared bio-adsorbent showed different chemical functional groups on its surface. The study demonstrated that the bio-adsorbent had a monolayer adsorption capacity of 76.652 mg g(-1) at 27 degrees C and followed the Freundlich isotherm and pseudo second order kinetic model. The adsorption process was found to be dominated by electrostatic interactions between the functional groups on the bio-adsorbent surface and the dye, with intraparticle diffusion as the rate determining step.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Multidisciplinary Sciences
Donghun Kim, Supriya Ghosh, Nusnin Akter, Andrea Kraetz, Xuekui Duan, Gyeongseok Gwak, Neel Rangnekar, J. R. Johnson, Katabathini Narasimharao, Maqsood Ahmad Malik, Shaeel Al-Thabaiti, Benjamin McCool, J. Anibal Boscoboinik, K. Andre Mkhoyan, Michael Tsapatsis
Summary: In this study, a new method for direct synthesis of low-defect-density, thin, and flat zeolite nanosheets was reported, and their application as high-performance membranes was demonstrated. These nanosheets showed improved thickness uniformity and absence of rotational and intergrowth defects, making them promising for various separation applications.
Article
Chemistry, Physical
Mohamed Mokhtar M. Mostafa, Wejdan Bajafar, Lin Gu, Katabathini Narasimharao, Mohamed Abdel Salam, Abdulmohsen Alshehri, Nezar H. Khdary, Sulaiman Al-Faifi, Abhishek Dutta Chowdhury
Summary: Transition metal oxide systems, particularly spinel cobaltite oxides, have been widely studied in heterogeneous catalysis. In this study, nanosized Cu, Ni, and Zn cobaltite spinel oxides were synthesized and their physicochemical properties and electrochemical performance were characterized. Despite some advantages, the catalytic electrochemical CO2 reduction performance of spinel cobaltite catalysts still needs improvement due to the low number of active sites and poor electrical conductivity.
Article
Chemistry, Physical
Tamer S. Saleh, Abdullah S. Al-Bogami, Katabathini Narasimharao, Ziya A. Khan, Iban Amenabar, Mohamed Mokhtar
Summary: This study presents a novel sonophotoreactor based on an ultrasonic cleaning bath and blue LED light for the copper-catalyzed monoarylation of pyrazoles. The combination of ultrasound irradiation and blue LED light leads to a synergistic effect, enabling the efficient synthesis of pyrazoles with relatively unreactive aryl halides. The use of inexpensive copper(I)iodide and 1,10-phenanthroline as catalysts reduces the cost and energy consumption of the C-H arylation reaction.
Article
Chemistry, Physical
Salwa D. Al-Malwi, Rahmah H. Al-Ammari, Abdulmohsen Alshehri, Katabathini Narasimharao
Summary: This study successfully synthesized silver-containing nanomaterials and investigated their physicochemical properties and photocatalytic performance. The Ag-4 sample with small crystallite size and pure Ag2CO3 phase exhibited high photocatalytic activity.
Article
Chemistry, Physical
Mohamed Mokhtar M. Mostafa, Tamer S. Saleh, Salem M. Bawaked, Khadijah S. Alghamdi, Katabathini Narasimharao
Summary: In this study, an eco-friendly and efficient Pd@Chitosan catalyst was synthesized and applied as a heterogeneous catalyst for C-H arylation reaction. The results showed that the Pd@Chitosan catalyst exhibited high catalytic activity and selectively converted aryl iodides and bromides to the desired product. The XPS analysis provided insights into the reaction mechanism of the Pd@Chitosan catalyst.
Article
Chemistry, Physical
Muhmmed Ali Alnassar, Abdulmohsen Alshehri, Katabathini Narasimharao
Summary: Magnesium silicate nanosheets (MgSiNS) and graphitic carbon nitride (g-C3N4) nanocomposites were synthesized with varying weight percentages of g-C3N4. The composites showed excellent photocatalytic activities for degrading methylene blue (MB) and adsorbing Pb2+ under visible light irradiation. The study also investigated the effects of different reaction parameters on the performance of the composites.
Article
Chemistry, Multidisciplinary
Ahmed Hussain Jawhari, Nazim Hasan, Ibrahim Ali Radini, Katabathini Narasimharao, Maqsood Ahmad Malik
Summary: The photocatalytic production of hydrogen from alcohols has the potential to be a low-cost renewable energy source. In this study, noble metal deposited LaMnO3 nanocomposites were successfully synthesized and their photocatalytic activity was evaluated. Among the synthesized nanocomposites, Pt-LaMnO3 exhibited superior activity for hydrogen production due to its low bandgap energy, high photoelectron generation, and enhanced charge separation.
Article
Chemistry, Physical
Mohamed Mokhtar Mohamed Mostafa, Ahmed Shawky, Sharif Fakhruz Zaman, Katabathini Narasimharao, Mohamed Abdel Salam, Abdulmohsen Ali Alshehri, Nezar H. Khdary, Sulaiman Al-Faifi, Abhishek Dutta Chowdhury
Summary: The study focuses on the use of semiconductor photocatalysts for the photoreduction of CO2 into renewable fuels. Nanocomposite photocatalysts composed of bismuth oxide and cerium oxide were synthesized and evaluated. The results showed improved crystalline structure, morphology, and surface texture, as well as enhanced charge separation and light absorbance in the visible regime. The adjusted dosage of the photocatalyst selectively produced methanol under visible light and exhibited bearable reusability for multiple cycles.
Article
Chemistry, Multidisciplinary
Shaeel Ahmed Althabaiti, Maqsood Ahmad Malik, Manoj Kumar Khanna, Salem Mohamed Bawaked, Katabathini Narasimharao, Soad Zahir Al-Sheheri, Bushra Fatima, Sharf Ilahi Siddiqui
Summary: This study utilized nanotechnology to prepare CuO, CdWO4, and CuO-CdWO4 nanocomposites using a cost-efficient and enviro-friendly green chemistry-based approach. Characterization of the materials was conducted using various techniques, and it was found that CuO-CdWO4 nanocomposite showed the highest H-2 production when using methanol as the sacrificial reagent, due to faster charge separation and higher visible light absorption.
Article
Chemistry, Physical
Katabathini Narasimharao, Mohamed Mokhtar M. Mostafa, Zahra M. M. Al-Amshany, Wejdan Bajafar
Summary: In this study, CaO/ZnCo2O4 nanocomposites were synthesized and found to exhibit superior catalytic activity in ester exchange reactions. The nanocomposite with 20% CaO and 80% ZnCo2O4 showed the highest catalytic performance, which can be attributed to its high number of basic sites and high porosity.
Article
Pharmacology & Pharmacy
Maqsood Ahmad Malik, Laila AlHarbi, Arshid Nabi, Khalid Ahmed Alzahrani, Katabathini Narasimharao, Majid Rasool Kamli
Summary: This article discusses the incorporation of magnetic nanoparticles into natural carbon frameworks derived from Nigella Sativa seeds and their synthesis for biomedicine application. The magnetic Nigella Sativa Seeds (Magnetic NSS) possess excellent water diaper presence due to the presence of oxygenous hydroxyl and carboxyl groups. The physicochemical properties of the composites were extensively characterized, and the synthesized magnetic NSS exhibited antioxidant, antifungal, and anti-biofilm properties.
Review
Chemistry, Physical
Nadiyah Albeladi, Qana A. Alsulami, Katabathini Narasimharao
Summary: The recent abnormal weather changes in different parts of the world are attributed to global warming, caused by the excessive release of greenhouse gases into the atmosphere. Carbon dioxide (CO2) is one of these gases that can be captured and reused to produce fuel through the methanation process. Nickel- and silica-based catalysts have shown promise due to their efficiency, availability, and affordability. However, these catalysts tend to experience metal sintering at high temperatures. Researchers have made significant improvements by modifying synthesis methods, supports, metal loading amounts, and promoters. These modifications have resulted in enhanced stability, activity, and surface area, dispersion, and metal-support interactions. Nickel loading affects the structure and catalytic activity, while doping enables CO2 conversion at lower temperatures and the formation of basic sites. This review aims to discuss the CO2 methanation process using Ni- and SiO2-based catalysts, particularly focusing on silica-supported Ni metal in previous studies and suggesting directions for future research.
Article
Chemistry, Multidisciplinary
Shaeel Ahmed Althabaiti, Zaheer Khan, Katabathini Narasimharao, Salem Mohamed Bawaked, Soad Zahir Al-Sheheri, Mohamed Mokhtar, Maqsood Ahmad Malik
Summary: An Ag-modified TiO2 nanomaterial was synthesized using a one-pot method. The structure and morphology of the synthesized material were determined using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results showed that the addition of metallic Ag nanoparticles decreased the optical band gap and photoluminescence intensity of TiO2, while increasing the Raman peak intensity and absorbance. The Ag-modified TiO2 nanomaterial exhibited higher photocatalytic efficiency than bare TiO2 and Ag metal NPs, attributed to the synergistic effect between Ag metal and TiO2 structures.
