Article
Chemistry, Multidisciplinary
Mihaela Mureseanu, Mihaela Filip, Irina Bleotu, Cezar Ionut Spinu, Alexandru Horia Marin, Iulia Matei, Viorica Parvulescu
Summary: A new series of Cu(II) and Mn(II) complexes with Schiff base ligands derived from 2-furylmethylketone (Met), 2-furaldehyde (Fur), and 2-hydroxyacetopheneone (Hyd) have been synthesized on functionalized SBA-15-NH2, MCM-48-NH2, and MCM-41-NH2 supports. The hybrid materials were characterized by various techniques and their catalytic performances in oxidation reactions were evaluated. The best catalytic activity was observed for the SBA-15-NH2-MetMn catalyst in the oxidation of cyclohexene, and no leaching was observed for Cu and Mn complexes.
Article
Chemistry, Inorganic & Nuclear
Vanessa P. McCaffrey, Olivia Q. Conover, Michael A. Bernard, Jonathan T. Yarranton, Nicholas R. Lessnau, Jordan P. Hempfling
Summary: Dioxovanadium(V) salicylaldehyde semicarbazone complexes with substituents ranging from electron donating to electron withdrawing were synthesized and characterized, showing different selectivity towards epoxidation and oxidative cleavage depending on the ligand substitution and chosen oxidant. The complexes exhibited comparable conversions to similar catalysts but with improved selectivity.
Article
Chemistry, Multidisciplinary
Mingxing Duan, Xinguo Wang, Wenjing Peng, Dongjie Liu, Qingyan Cheng, Qiusheng Yang
Summary: In this study, a heterogeneous, recoverable catalyst of Co(II)-L@nano-SiO2 was synthesized and investigated for the oxidation of cyclohexene under mild conditions. The results showed excellent catalytic activity with high selectivity for the major products, and the mechanism involved allylic oxidation and overoxidation reactions were confirmed by DFT calculations.
Article
Chemistry, Applied
Faezeh Farzaneh, Zahra Ahmadi, Zahra Azarkamanzad, Maryam Ghahremani
Summary: VO(acac)(2) and VO(Salen) complexes were immobilized on ethylenediamine-modified graphene oxide and exhibited promising epoxidation performance with high conversion and selectivity. The immobilized complexes showed good recyclability and maintained catalytic activity for multiple runs, indicating their potential practical application.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Sumeyra Z. Ozturk, Mine Kirkbinar, Alican Semerci, Murat Zengin, Murat Tuna, Fatih Caliskan
Summary: A surface modification procedure was used to synthesize sodium montmorillonite powders modified with CuSO4.5H(2)O and Cu-Schiff base complex. The resulting nanoparticles exhibited a needle-like structure with CuSO4.5H(2)O and a coral appearance with Cu-Schiff base. The antibacterial activity of the Cu+2-MMT nanocomposite was demonstrated against various bacteria, with high inhibition observed against S. aureus, E. faecalis, and E. coli.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Nanoscience & Nanotechnology
Meysam Tayebi, Zohreh Masoumi, Ahmad Tayyebi, Jun-Hwan Kim, Hyungwoo Lee, Bongkuk Seo, Choong-Sun Lim, Hyeon-Gook Kim
Summary: This study developed a safe and sustainable method for the epoxidation of cyclohexene using water as the source of oxygen at room temperature and ambient pressure. Through optimization, the alpha-Fe2O3 photoanode achieved a 72.4 +/- 3.6% yield and a 35.2 +/- 1.6% Faradaic efficiency in epoxidizing cyclohexene. Additionally, the photoelectrochemical (PEC) process reduced the applied voltage of the electrochemical cell by 0.47 V. Epoxidation with green solvents via PEC methods has great potential for various oxidation reactions of value-added and fine chemicals.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Zahra Khoshkholgh, Shabnam Sohrabnezhad
Summary: In this study, a novel nanocomposite (Mt/COF-CuO/Cu2O) was successfully constructed by incorporating copper oxide materials including cupric oxide (CuO) and cuprous oxide (Cu2O) onto montmorillonite/covalent organic frameworks (COFs) composite via a solvothermal method. The resulting material exhibited excellent performance in both antibacterial activity and heterogeneous photocatalytic degradation of textile dye in wastewater.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Applied
Yaregal Awoke, Yonas Chebude, Isabel Diaz
Summary: The aim of this study is to obtain Ti-containing Periodic Mesoporous Organosilica (PMO) materials with catalytic activity in epoxidation reactions. The Ti-PMO materials possess ordered 2-dimensional hexagonal mesostructures, high surface areas, uniform pore sizes, large pore volumes, and tetrahedrally incorporated Ti(IV) species on the surface of the pore walls. The catalytic activities of these materials were tested in the epoxidation of cyclohexene and vernonia oil, showing good conversion rates and selectivity.
Article
Chemistry, Inorganic & Nuclear
Vahid Mirdarvatan, Bahram Bahramian, Aliakbar Dehno Khalaji, Morgane Poupon, Michal Dusek, Raouf Mazandarani
Summary: A new dinuclear vanadium(V) Schiff base complex was synthesized and characterized, showing potential application in epoxidation reactions and evaluated for antibacterial activity. Experimental optimization and density functional theory calculations were used to study the complex, revealing its promising properties in both synthetic and biological applications.
Review
Chemistry, Inorganic & Nuclear
Manoj Kumar, Atresh Kumar Singh, Alok Kumar Singh, Rajesh K. Yadav, Satyam Singh, Atul P. Singh, Amit Chauhan
Summary: Schiff bases have been widely studied in coordination chemistry for their reactivity and adaptable metal complexes. They have numerous applications in various fields, including catalysis, material science, and bioinorganic chemistry. This review focuses on Schiff bases derived from salicylaldehyde and their derivatives, with a specific emphasis on their synthesis, characterization, and applications in metal complexes. The article provides important knowledge for researchers in this field and encourages further research in Schiff base complexes.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Chemistry, Applied
Haoyang Zhang, Lifen Xu, Xinyu Chang, Songsong Miao, Yuting Sun, Mingjun Jia
Summary: A series of Mo-containing MFI zeolites with different Mo loadings were synthesized using a Mo-EDTA complex as the Mo source. The complexing capability of EDTA(2-) played a critical role in adjusting the release rate of Mo species and achieving a uniform distribution of Mo in the MFI framework. The optimized catalyst, Mo-MFI-50, exhibited efficient conversion of cyclohexene to epoxide with high selectivity.
CHINESE JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Huang Pan, Rusi Peng, Zhiguo Zhu, Hao Xu, Mingyuan He, Peng Wu
Summary: Nanocrystalline Ti-Beta zeolite with high hydrophilicity and a Ti-rich exterior was prepared via a specific dissolution-recrystallization method. The modified Ti-Beta zeolite exhibited greatly enhanced catalytic activity in the epoxidation of cyclohexene.
Article
Engineering, Chemical
Zijie Zhang, Qianyu Zha, Ying Liu, Zhibing Zhang, Jia Liu, Zheng Zhou
Summary: In this work, a new phosphotungstic acid catalyst was developed for the selective epoxidation of cyclohexene to cyclohexene oxide. The catalyst type, solvent type, catalyst loading, initial molar ratio, temperature, cycle performance, and substrate extensibility were studied and optimized, and the kinetic parameters and reaction mechanism were determined. This novel catalyst and the corresponding dynamics and mechanism study could potentially contribute to the industrial application of cyclohexene epoxidation with H2O2.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Review
Chemistry, Inorganic & Nuclear
Peng Dong, Tingna Shao, Jinlian Li, Xiaohui Zhang, Yu Zhao, Xinhong Zhao, Guixian Li
Summary: This review discusses the structure-activity relationships and synthesis processes of various heterogeneous transition metal-based catalysts used in cyclohexene epoxidation reactions. The current research status and catalyst design suggestions are summarized.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Polymer Science
Guifu Si, Meizhou Qi, Chen Tan, Changle Chen
Summary: The paper introduces a tandem catalysis concept where a single catalyst enables multiple catalytic transformations to efficiently prepare novel polymers with various properties.
Article
Chemistry, Physical
Nadine J. Kanik, Artur Kuligiewicz, Jeffrey T. Cullen
Summary: This study examined the effects of different pre-treatments on the structural H-isotope composition of clay minerals. The results showed that different pre-treatments had varied impacts on different clay minerals, and the choice of pre-treatment should be based on the specific properties and mineralogy of the samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Lorenzo Lisuzzo, Giuseppe Cavallaro, Stefana Milioto, Giuseppe Lazzara
Summary: This study proposes Pickering emulsions based on wax and halloysite clay nanotubes for coating silk sutures to increase their loading capacity towards eosin. The presence of halloysite/wax microspheres on the surface of silk sutures has also been explored for controlled release of hydrophobic drugs. The influence of the coating on the thermal and mechanical properties of the sutures has been studied using various techniques. In conclusion, the wax/halloysite Pickering emulsions can successfully generate hydrophobic microdomains on the surface of silk sutures, leading to enhanced flexibility and improved loading capacity towards eosin.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Bruna F. Alves, Rita C. P. Nunes, Luiz C. Bertolino, Elizabete F. Lucas
Summary: Operational problems in the oil industry caused by the precipitation of paraffins can be prevented by using polymeric additives. This article evaluates the use of polymeric nanocomposites as pour point reducers in different types of crude oil and finds that they are more efficient than pure poly(ethylene-covinyl acetate) (EVA) in reducing the pour point. The nanocomposites also modify the wax crystals and reduce the viscosity of the oil samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
K. A. Daniels, C. C. Graham, A. C. Wiseall, J. F. Harrington, P. Sellin
Summary: Geological storage with clay buffer is widely preferred for removing hazardous radioactive waste. The impact of fluid salinity and void space on the swelling behavior of barrier bentonites was examined through experiments. The findings suggest that clay swelling is suppressed at higher salinities, which affects the void-filling process.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
N. Werling, A. Kuligiewicz, A. Steudel, R. Schuhmann, F. Dehn, K. Emmerich
Summary: Thermal treatment of clay minerals can be used to produce building materials and environmentally friendly binders. This process involves dehydration, dehydroxylation, breakdown of structure, and recrystallization of high temperature phases. Rehydration and rehydroxylation are important factors to consider for geopolymers and SCM.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Xuan Wang, Hao Ding, Zhuoqun Xu, Jianmeng Zhang, Yanbin Yao
Summary: Rutile nano-TiO2 was loaded onto the surface of sericite to prepare sericite-rutile composite particles, which were then modified with HDTMS and sprayed onto the substrates to form sericite-rutile/HDTMS composite coatings with UV shielding and superhydrophobic self-cleaning properties. The coating exhibited good UV shielding rate and remained superhydrophobic after UV irradiation. The hierarchical structure of the sericite-rutile composite and the low surface energy of HDTMS contributed to the superhydrophobicity and UV shielding effect of the coating.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Kailang Sun, Taojun Zhang, Jie Zhou, Yonghong Liu, Minfeng Zeng, Zhen Yang, Ruokun Feng, Xiaorong Ren, Peng Zhang, Baoyi Wang, Xingzhong Cao
Summary: Chitosan-Pd0 nano particles encapsulated in Al, Co-pillared montmorillonite nanocomposites were successfully synthesized using a facile one-pot heat treatment method. The Al, Co pillaring effectively expanded the surface area and generated numerous mesopores in the interlayer space of the MMt. The resultant nanocomposite exhibited similar high comprehensive catalytic performances as the one prepared by the regular divided-multistep method. The encapsulation of CS chains and doping of Co in the Al pillaring also contributed to the improved catalytic performance.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Nathalie Fagel, Isabel Israde-Alcantara, Reza Safaierad, Marttiina Rantala, Sabine Schmidt, Gilles Lepoint, Pierre Pellenard, Nadine Mattielli, Sarah Metcalfe
Summary: Environmental conditions significantly influence clay minerals, and studying clay sediments in tropical lakes can provide valuable insights into past environmental conditions. In this study, multiproxy records from sediment cores of three crater lakes in central Mexico were analyzed. The results showed that disordered kaolinite, formed through hydrolysis and hydrothermal alteration, was the predominant mineral in the sediments. The abundance of kaolinite varied in relation to organic carbon and organic matter-related elements, and showed opposite trends with lithogenic elements. Geochemical data suggested that the increase in kaolinite abundance is linked to the formation of organo-mineral aggregates and lake level changes in closed basins.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
M. J. Martin-Alfonso, A. Mejia, F. J. Martinez-Boza, P. Partal
Summary: The drilling industry is facing new challenges to develop eco-friendlier drilling fluids. Organic modified sepiolite dispersed in oil can be an excellent additive with suitable rheological properties. This study investigated the effect of alkyl ammonium modifiers on the microstructure and rheological properties of sepiolite-vegetable oil dispersions under high-temperature and high-pressure conditions.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Weiquan Zhan, Siyuan Yang, Shenxu Bao, Liuyi Ren, Cheng Liu
Summary: The interaction between talc and the depressor CMC was investigated through molecular dynamics simulation and density functional theory calculation. It was found that CMC showed stronger adsorption on the edge plane of talc due to enhanced interactions with polar groups and water molecules. The study also revealed specific interactions between H atoms in CMC and O atoms in the edge plane, as well as between O atoms in CMC and Si, Mg atoms in the edge plane. Hydration shells on the basal and edge planes of talc were examined to explain the phenomenon.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Pierre Dramou, Yiyang Sun, Xu Ni, Fangqi Wang, Hua He
Summary: In this study, a magnetic nanocomposite was prepared and used for the separation of rutin from real samples through magnetic solid phase extraction (MSPE). The nanocomposite exhibited high specific surface area, chemical and thermal stability, water solubility, and easy separation in aqueous solution. Characterization and experiments confirmed the successful synthesis and efficient enrichment ability of the nanocomposite.
APPLIED CLAY SCIENCE
(2024)