Article
Chemistry, Applied
Norihito Hiyoshi, Takuji Ikeda, Yasuhisa Hasegawa, Koichi Sato
Summary: The study attempted to determine the metal location and estimate the site occupancy in zeolite through Cs-corrected STEM imaging of La-exchanged NaY zeolite. It was found that La atoms were located at sites I and I' with an estimated occupancy of about a fourth for both sites. The imaging also revealed that the La occupancy at site I was much larger than measured by XRD, possibly due to the highly dehydrated state of LaNaY.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Nestor J. Zaluzec
Summary: Aberration correction in the analytical transmission electron microscope has been closely associated with advancements in high-resolution imaging. This paper demonstrates that by combining this technology with new system designs that optimize electron optics and x-ray detection, performance has improved by more than tenfold over the past 25 years.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Can Xu, Weichen Wei, Yong He
Summary: The hydrogen separation performance of molecular sieving membranes was significantly enhanced through ion exchange, showing great potential for application in hydrogen purification.
Article
Environmental Sciences
Chuanting Zhou, Ying An, Wei Zhang, Dianhai Yang, Jianguo Tang, Jianfeng Ye, Zhen Zhou
Summary: The study investigated the inhibitory effects of calcium ion on ammonium exchange by zeolite and developed a method to alleviate this inhibition effect. The results showed that increasing calcium ion concentration led to a decrease in NH4+ removal efficiency and affected the exchange kinetics and equilibrium isotherms. The periodic precipitation of calcium ion as calcium carbonate was found to be an effective way to maintain efficient NH4+ removal by zeolite.
Article
Chemistry, Physical
Shuo Ai, Yue Qin, Yuxiang Hong, Linghui Liu, Wanguo Yu
Summary: Selective inhibition of acetalization reaction on ion-exchange-modified zeolite was studied, which significantly suppressed acetalization and oligomerization reactions, improved the recovery of ethylene glycol (EG), and enhanced the stability of the zeolite.
JOURNAL OF CATALYSIS
(2022)
Article
Engineering, Environmental
Songhyeon Kwon, Chaehoon Kim, Eunhye Han, Hoin Lee, Hae Sung Cho, Minkee Choi
Summary: Zeolites with high Si/Al ratios exhibit enhanced affinity to Cs+ ions, while zeolites containing 8-membered rings show extra-high selectivity for Cs+. In contrast, the affinity of Sr2+ ions to zeolites decreases as the Si/Al ratio increases, and Sr2+ exchange is less dependent on zeolite structures due to strong hydration. The kinetics of Sr2+ exchange is slower than that of Cs+ exchange due to the bulkiness of hydrated Sr2+ ions, with larger micropore channels beneficial for faster exchange kinetics.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Chemical
Xiuxiu Ren, Shengjie Yang, Rong Xu, Meng Guo, Weiqiu Huang, Ming Ding, Jing Zhong
Summary: By exchanging Na+ with mono- and divalent cations, the structure and performance of Na-mordenite zeolite membranes were modified, resulting in higher water capacity and improved separation efficiency in the dehydration of acetic acid by pervaporation.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Applied
Stefanie C. M. Mizuno, Siriwan Dulnee, Tassia C. P. Pereira, Ricardo J. Passini, Ernesto A. Urquieta-Gonzalez, Jean Marcel R. Gallo, Joao B. O. Santos, Jose M. C. Bueno
Summary: This study investigates the influences of Cu content, Si/Al ratio, and sample preparation method on the active Cu species in mordenite (MOR). The XANES spectra indicate that isolated Cu+ species were formed after interaction with CH4 and were re-oxidized under a flow of water steam, showing the impact of different Cu species on CH4 oxidation.
Article
Nanoscience & Nanotechnology
Shadab Dabagh, Somayeh Asadi Haris, Behzad Khatamsaz Isfahani, Nureddin Ashammakhi, Yavuz Nuri Ertas
Summary: Zeolite/CuFe2O4 nanocomposites were synthesized to optimize cation exchange capacity of zeolite and study its antibacterial activities. The addition of CuFe2O4 nanoparticles improved the antibacterial efficacy and the nanocomposites showed strong antibacterial activity even after recycling. This research provides potential applications in drug delivery systems, wound healing, tissue engineering, and biomedical fields.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Thamsanqa Ncube, Hans Oskierski, Gamini Senanayake, Bogdan Z. Dlugogorski
Summary: This study investigates an alternative process route for lithium extraction from alpha-spodumene using potassium sulfate, which also produces leucite as a slow release fertilizer. The reaction sequence between alpha-spodumene and potassium sulfate is documented using synchrotron X-ray diffraction and differential scanning calorimetry, providing insights into the mechanism of the transformation process.
INORGANIC CHEMISTRY
(2021)
Article
Biotechnology & Applied Microbiology
Ha Le, Phuoc H. Ho, Annette Trunschke, Reinhard Schomaecker, Arne Thomas
Summary: This study investigates the effects of zeolite topology and activation temperature on the catalytic performance of Cu- and Fe-containing zeolites. The results show that Cu species exchanged in medium-pore zeolites (mordenite, ZSM-5, and ferrierite) yield more methanol, while large-pore zeolites (zeolite beta and zeolite gamma) are not suitable for active Cu sites.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Ana Carolina Feltrin, Hilaria Mendes de Souza, Thiago Fernandes de Aquino, Carolina Resmini Melo Marques, Elidio Angioletto
Summary: Lithium-based zeolites are commonly used for PSA oxygen concentration, with high-purity chemical reactants like aluminates and silicates. This study synthesized zeolites from kaolin, investigating metakaolinization temperature and molar ratios influence. Factors like H2O/Na2O and SiO2/Al2O3 ratios significantly contributed to the formation of zeolite X, while metakaolinization temperature had a major impact on zeolite A.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Chemistry, Applied
Josefine Probst, John G. Outram, Sara J. Couperthwaite, Graeme J. Millar, Prasad Kaparaju
Summary: This study successfully addressed research challenges in zeolite N synthesis, focusing on maximizing cation exchange capacity, controlling crystal size and shape, and improving ion exchange properties. By optimizing synthesis conditions and utilizing potassium hydroxide and potassium chloride, the study achieved increased CEC values and enhanced performance for ammonium ion exchange.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Applied
Hui Liu, Rongrong Kang, Hao Zhou, Xu Yang, Yingyuan Tan, Lijiao Ma, Longfei Ma, Junhui Li
Summary: Selective adsorption of benzene-cyclohexane gas-phase mixture over different zeolites was investigated. NaY exhibited significantly higher adsorption selectivity and capacity for benzene than NaZSM-5 and NaMOR, while ion exchange of Y zeolite with Zn2+ greatly enhanced the selectivity and capacity. On the other hand, exchange with Cu2+, Cr3+, or Fe3+ weakened the adsorption performance, and severe pore blockage occurred in the case of Cr3+ or Fe3+ exchange. Optimizing the solution concentration and exchange time during Zn2+ ion exchange treatment resulted in high selectivity and capacity for benzene over the 0.2-Zn-Y (2 h) and 0.1-Zn-Y (4 h) samples.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Applied
Yansi Tong, Danhua Yuan, Wenna Zhang, Yingxu Wei, Zhongmin Liu, Yunpeng Xu
Summary: EAB zeolite was successfully synthesized and applied for the selective adsorption of Li+, Na+, and K+ ions. The ion exchange behavior and selectivity towards the ions were studied, showing potential for the separation of alkali metal ions. Thermodynamic study revealed that K+ ion exchange was more energetically favorable than Li+ ions, with increasing energy barriers in the order K+ < Na+ < Li+.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Physics, Applied
M. Katsikini, V. Kachkanov, P. Boulet, P. R. Edwards, K. P. O'Donnell, V. Brien
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Environmental Sciences
Joanna Maria Zougrou, Stilianos Stoulos, Nikolaos Kantiranis, Lambrini Papadopoulou, Ioakeim Ioakeimidis, Maria Katsikini, Eleni Paloura, Evangelia Tsoukala
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY
(2018)
Article
Materials Science, Multidisciplinary
G. P. Dimitrakopulos, C. Bazioti, E. Papadomanolaki, K. Filintoglou, M. Katsikini, J. Arvanitidis, E. Iliopoulos
MATERIALS SCIENCE AND TECHNOLOGY
(2018)
Article
Multidisciplinary Sciences
Hosni Idrissi, Matteo Ghidelli, Armand Beche, Stuart Turner, Sebastien Gravier, Jean-Jacques Blandin, Jean-Pierre Raskin, Dominique Schryvers, Thomas Pardoen
SCIENTIFIC REPORTS
(2019)
Article
Biochemistry & Molecular Biology
M. Katsikini, E. Proiou, N. Vouroutzis, F. Pinakidou, E. C. Paloura, D. Smirnov, M. Brzhezinskaya, S. Ves
JOURNAL OF STRUCTURAL BIOLOGY
(2020)
Article
Engineering, Environmental
F. Pinakidou, M. Katsikini, S. Varitis, Ph. Komninou, G. Schuck, E. C. Paloura
Summary: The effective stabilization of tannery sludge wastes was explored using X-Ray Absorption Fine Structure (XAFS) spectroscopies, showing that the chemical composition of the waste strongly modulates the reduction of Cr(VI) and the structural role of Cr. Eskolaite microcrystallites embedded in the silica matrix of vitrified samples are related to glass basicity, with the toxic Cr(VI) being safely incorporated and immobilized in the silica matrix. Thermal treatment transforms almost all Cr(VI) to Cr(III) in glass-ceramics, while eskolaite formation is promoted.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Physical
Alberto Piccioni, Daniele Catone, Alessandra Paladini, Patrick O'Keeffe, Alex Boschi, Alessandro Kovtun, Maria Katsikini, Federico Boscherini, Luca Pasquini
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Physical
Matthew Zervos, Andreas Othonos, Theodore Pavloudis, Stefanos Giaremis, Joseph Kioseoglou, Kalliopi Mavridou, Maria Katsikini, Fani Pinakidou, Eleni C. Paloura
Summary: In this study, Cu3N layers were deposited and analyzed for their optical properties and the impact of surface oxidation on the band structure. It was found that oxygen can act as a shallow impurity dopant without creating midgap states, allowing for the modulation of the direct energy band gaps of the semiconductor.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Engineering, Chemical
Kalliopi Mavridou, John Arvanitidis, Eleni Pavlidou, Sotirios Ves, Maria Katsikini
Summary: Raman spectroscopy is used for non-destructive characterization of graphite in semi-metallic brake pads in vehicles, with the main Raman bands serving as useful probes of quality and wear status due to their sensitivity to structural disorder. Wear of the graphite lubricant is found to occur in two stages: transformation to nanocrystalline graphite and subsequent amorphization, with the intensity of the defect-related D' peak providing information about the nature of defects.
LUBRICATION SCIENCE
(2021)
Article
Materials Science, Ceramics
F. Pinakidou, M. Katsikini, E. C. Paloura
Summary: XAFS spectroscopies were used to investigate the structural role of Pb in vitrified industrial wastes. It was found that Pb successfully immobilizes in a vitreous matrix, but devitrification promotes microcrystallite formation. The stability of vitroceramics is correlated to the type of microcrystallites formed.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Physics, Applied
M. Katsikini, K. Filintoglou, F. Pinakidou, N. Pliatsikas, J. Arvanitidis, D. Christofilos, E. C. Paloura, S. Ves, U. Reinholz, E. Papadomanolaki, E. Iliopoulos
Summary: This study combines In-K-edge x-ray absorption fine structure (EXAFS), x-ray photoelectron, and Raman spectroscopy to comprehensively investigate InxGa1-xN layers with energy gaps covering nearly the entire visible spectrum. The research focuses on deriving the ionicity of In-N bonds, phonon frequency dependence, and phonon confinement due to alloying-induced perturbations in the periodic potential.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Fani Pinakidou, Konstantinos Simeonidis, Eirini Myrovali, Maria Brzhezinskaya, Eleni C. Paloura, Makis Angelakeris, Maria Katsikini
Summary: This study reports on the oxidation degree and spatial distribution of iron oxide magnetic nanoparticles in the application of magnetic particle hyperthermia. The results show that the application of MPH can lead to aggregation and increased oxidation of the nanoparticles. The behavior of nanoparticles of different sizes varies under MPH, with the smallest particles showing the most pronounced aggregation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Kalliopi Mavridou, Maria Katsikini, Andreas Othonos, Nikoletta Florini, Philomela Komninou, Matthew Zervos
Summary: CuO nanowires are grown and converted into curly Cu3N nanowires by depositing Cu over the CuO and reacting with NH3:H-2. The obtained Cu3N nanowires exhibit good optical properties, but have short carrier lifetimes.
MATERIALS ADVANCES
(2022)
Article
Materials Science, Multidisciplinary
Ming-Hui Sun, Jian Zhou, Zhi-Yi Hu, Li-Hua Chen, Li-Yuan Li, Yang-Dong Wang, Zai-Ku Xie, Stuart Turner, Gustaaf Van Tendeloo, Tawfique Hasan, Bao-Lian Su
Article
Chemistry, Multidisciplinary
Konstantinos Termentzidis, Valentina M. Giordano, Maria Katsikini, Eleni Paloura, Gilles Pernot, Maxime Verdier, David Lacroix, Ioannis Karakostas, Joseph Kioseoglou
Article
Chemistry, Applied
Lulu Wan, Gan Ye, Yuying Chang, Zhaohan Yang, Guangming Shi, Qiuli Zhang, Jin Wang
Summary: This study developed an efficient approach to upgrade the oxidative desulfurization (ODS) performance of Zr-MOFs with proton stimulation. Experimental results showed that the introduction of protons can significantly improve the ODS efficiency. This work provides a facile and efficient strategy for enhancing the ODS performance of pristine MOFs.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Qiqi Lu, Xiu-Zhi Wei, Qi Zhang, Xinghua Zhang, Lungang Chen, Jianguo Liu, Yubao Chen, Longlong Ma
Summary: The application of Pd-M bimetallic clusters in the selective hydrogenation reaction was investigated, and the Pd0.6Ni@S-1 catalyst was found to exhibit high selectivity in the conversion of phenylacetylene to styrene. The confinement effect of zeolite inhibited over-hydrogenation and improved the stability of the catalysts. Furthermore, the solvent properties also influenced the product distribution.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Review
Chemistry, Applied
Bo Li, Lumin Hong, Changdi Jing, Xianyang Yue, Huabo Huang, Qianqian Jiang, Jianguo Tang
Summary: MOF materials with adjustable pore structure and polymetallic sites have been explored as electrocatalysts for OER. Bimetallic materials show higher electrocatalytic activity than monometallic materials, while carbon-coated and doped MOF catalysts exhibit stable and good OER activity. The synergistic interaction between polymetallic active sites effectively improves the intrinsic activity of MOF on OER.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Shichun Gu, Ruyi Wang, Junxiong Zhang, Hairong Dong, Liping Deng, Xue Wang, Yapeng He
Summary: In this study, monodispersed hollow mesoporous organosilica nanospheres with controlled core cavity and mesoporous shell were successfully synthesized. These hollow nanospheres showed a high adsorption capacity for Pb2+ in water solution and exhibited acceptable recycling and stability.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Lucie Havelkova, Bogdana Bashta, Michaela Vankova, Jiri Zednik, Jiri Brus, Jan Svoboda, Alice Vagenknechtova, Jan Sedlacek
Summary: An atom-economic one-step chain-growth coordination homopolymerization providing high yields of functionalized hyper-cross-linked polyacetylenes with a permanent micro/mesoporous texture and a BET area of up to 1062 m2/g is reported. The homopolymerization is highly compatible with the heteroatom groups of the monomers and allows the preparation of well-defined porous networks with a wide spectrum of univalent groups.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Shirui Pang, Yuxin Liu, Zhe Zhang, Yuxin Li, Chunguang Li, Zhan Shi, Shouhua Feng
Summary: This study focuses on using a functional separator to suppress the shuttle effect of soluble lithium polysulfides in Li-S batteries. It is found that the functionalized sulfonic acid group not only accelerates the conduction of lithium ions, but also repels polysulfide anions through electrostatic interactions. The performance of the batteries is significantly improved with the use of this functionalized separator.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Pingping Li, Lei Han, Donghun Kim, Kemal Celebi
Summary: This study presents a fast synthetic strategy for the preparation of high-quality platelike MFI crystals using a thin-wall tubular reactor. The strategy is efficient, time-saving, and can be optimized, making it applicable to the preparation and optimization of other important materials.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Haitao Yin, Wei Wang, Yuxin Li, Hu Wen, Shuang Chen, Nanzhe Jiang
Summary: This study presents a template-free and solid-state-like crystallisation method for the synthesis of ZSM-5 zeolite, which can be scaled-up in production. Mechanical mixing of starting material components improves the dispersion of materials, leading to ZSM-5 zeolite with high crystallinity and size uniformity.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Congli Li, Jiang Wang, Zhenfei Wang, Jinxiang Dong, Qi Shi
Summary: This study investigates the evolution and autoreduction behavior of Cu species in CuCl/NaY adsorbent during vacuum thermal activation. It is found that Cu species migrate from supercages to the nearby plane of the six-membered ring connecting the supercage and sod cage during vacuum activation. At 150 degrees C, vacuum autoreduction occurs, resulting in the formation of Cu+Cl- species. The results provide reference for the preparation of pi-complex adsorbents.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Irena Khatrin, Iman Abdullah, Alan J. Mccue, Yuni K. Krisnandi
Summary: Hierarchical porous system with two types of mesopores provides a solution to the diffusion limitation in conventional zeolites. Cobalt oxide impregnated hierarchical ZSM-5 zeolite samples with intra- and inter-crystalline mesopores were synthesized using two different strategies. The physicochemical properties of the modified catalysts were analyzed, revealing distinct features given by the two mesoporous configurations. Catalytic activity analysis showed that Co-oxide/ZSM-5 with inter-crystalline mesopores exhibited higher activity in methane partial oxidation reaction compared to Co-oxide/ZSM-5 with intra-crystalline mesopores.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Nataliia Reinders, Martin Durovic, Pavla Honcova, Zaneta Dohnalova, Jana Luxova, Stanislav Slang, Jhonatan Rodriguez-Pereira, Petra S. Sulcova
Summary: This study presents a new method for preparing a microporous Ni2P/C catalyst with high catalytic activity. The redox reaction and carbon matrix formation during high-temperature treatment contribute to the stability and activity of the catalyst. Experimental and analytical results suggest that the microporous structure of the composite plays a crucial role in its catalytic performance. These findings are important for practical applications of efficient hydrogen production by water electrolysis.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Ana Raquel Bertao, Viktoriya Ivasiv, Cristina Almeida-Aguiar, Patricia R. Correia, Antonio M. Fonseca, Manuel Banobre-Lopez, Fatima Baltazar, Isabel C. Neves
Summary: This study developed a zeolite-based delivery system (ZDS) using silver and 5-Fluorouracil as antimicrobial and antineoplastic agents. The ZDS was characterized and its antimicrobial properties were investigated, showing better antibacterial effectiveness for the ZDS containing both silver and 5-FU.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Naonobu Katada, Nobuki Ozawa, Etsushi Tsuji, Keigo Kanehara, Akiho Otsuka, Taiga Sakamoto, Kirari Umezawa, Hitoshi Matsubara, Satoshi Suganuma, Momoji Kubo
Summary: First principles calculations were used to investigate the pathway for methylation of benzene with methane catalyzed by MFI type zeolite-supported Co species. The strong adsorption of benzene on Co is found to lower the activation energy for methane dissociation and promote the formation of toluene precursor. The activation energy of methane dissociation is also affected by the Al-Al distance.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Yuan Liu, An T. Ta, Kyoung Chul Park, Shenyang Hu, Natalia B. Shustova, Simon R. Phillpot
Summary: We use density functional theory to investigate the interactions of cerium, americium, and curium cations with crown ethers. Our results demonstrate that crown ethers can capture cerium, americium, and curium ions, and modifying the crown ether structure by substituting nitrogen atoms for oxygen atoms significantly increases their binding energies with radionuclides.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Zhengwu Peng, Shixing Wang, Yihui Wu, Xiang Liu, Hongliang Liu, Dekun Zhang, Likang Fu
Summary: An efficient adsorbent for recovery of germanium was prepared and characterized in this study. The adsorption behavior of Ge(IV) on the adsorbent was analyzed, and the results showed that it follows pseudo-secondary kinetic model and Langmuir isotherm model. The adsorbent exhibited good anionic anti-interference ability and can still maintain high adsorption efficiency after repeated adsorption.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
