Article
Chemistry, Multidisciplinary
An-An Zhang, Rui Wang, Hai-Bo Huang, Tian -Fu Liu, Rong Cao
Summary: Using metal-organic frameworks (MOFs) to design photocatalysts for CO2 reduction is a good idea, but currently restricted by low activity. Enhancing CO2 affinity and tuning the oxidation state of metal clusters in MOFs can potentially improve catalytic performance.
CHINESE CHEMICAL LETTERS
(2023)
Article
Environmental Sciences
Dongdong Guo, Yong Wan, Jiangshan Li, Ruiqi Liu, Lei Liu, Qiang Xue
Summary: This study comparatively investigated the adsorption performances of nine commonly used modified bentonites on multiple contaminants, and analyzed the adsorption mechanisms using XRD and FTIR. The results showed that SB-16 modified bentonite had the highest adsorption capacities for phenol and Pb(II). The insertion of surfactant molecules in the interlayer space of montmorillonite increased the substrate spacing, changing the structural properties of bentonite and enhancing the adsorption of organic contaminants. The functional groups in the polymer formed a spatial three-dimensional cross-linking structure on the bentonite surface, providing more adsorption sites for heavy metal ions. These findings suggest the potential industrial applications of modified bentonite in a contaminant barrier system.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Gokce Maide Bekaroglu, Sevim Isci
Summary: This study compares the effects of raw and purified montmorillonite on drug release. Purified montmorillonite has higher adsorption capacity and more pronounced toxicity. However, both types of montmorillonite show high biocompatibility with normal cells and successfully load and release drugs.
Article
Construction & Building Technology
Ping Zhang, Lin Chen, Ruishi Xie, Lixian Song, Jun Jiang
Summary: Binary bentonite-water and ternary cement-bentonite-water systems were prepared to enhance the stability of fresh cement slurry for promoting bentonite as a low-cost viscosity modifying admixture. The interlayer ions of bentonite played crucial roles in improving the stability of cement slurry, and the performance of Ca2+ bentonite can be enhanced by introducing Li+. The effect of bentonite on the stability of cement slurry and its influencing mechanism were proposed based on the experimental results.
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
(2022)
Article
Geochemistry & Geophysics
Afonso D. Macheca, Antonio B. Mapossa, Antonio J. Cumbane, Asmina E. Sulemane, Shepherd M. Tichapondwa
Summary: This study investigates the Na2CO3 activation of calcium bentonite clay and evaluates the influence of different conditions on its ion exchange capacity. The results demonstrate that the concentration of Na2CO3, activation temperature, and activation time significantly affect the ion exchange capacity and Na/Ca ratio of the clay. The experimental findings further confirm the structural and property changes of the calcium bentonite clay after activation.
Article
Food Science & Technology
Sneh Punia Bangar, R. A. Ilyas, Amreen Chowdhury, Muhammed Navaf, Kappat Valiyapeediyekkal Sunooj, Anil Kumar Siroha
Summary: Bentonite, a versatile clay mineral, has gained attention in the packaging field due to its unique properties. This review explores the incorporation of bentonite into biodegradable packaging systems, discussing its modification and addressing safety concerns. The research highlights the potential of bentonite in providing eco-friendly and functional packaging solutions.
TRENDS IN FOOD SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Yuetian Chen, Ning Wei, Yanfeng Miao, Haoran Chen, Meng Ren, Xiaomin Liu, Yixin Zhao
Summary: Bulk lead halide perovskite films with unique properties can be processed using low-cost methods. Solution-processed colloidal inorganic perovskite nanocrystals show potential for better stability and optoelectronic properties. In this study, CsPbBr3 nanocrystals are used to modify FAPbI(3) perovskite films, leading to improved stability and charge carrier dynamics.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Sonchai Intachai, Chomponoot Suppaso, Nithima Khaorapapong
Summary: The study focused on intercalating alkylammonium ions into Thai bentonite and investigating the effect on dye-adsorption efficiency. Different alkyl chain lengths and amounts of alkylammonium ions led to variations in the basal spacings of the intercalation compounds. The adsorption efficiency of alkylammonium-bentonites significantly increased, with a minimal decrease after multiple cycles of adsorption.
CLAYS AND CLAY MINERALS
(2021)
Article
Engineering, Chemical
Siyu Song, Guohua Gu, Weiqin Huang, Yanhong Wang
Summary: This study identified the mechanisms of chalcopyrite flotation with high sodium bentonite content using saline water with divalent cations, Ca2+ and Mg2+. The decrease in pulp viscosity significantly enhanced copper recovery and grade at a certain concentration of divalent cations, while non-selective aggregation of minerals also affected copper grade. The findings suggest that the ion exchange interaction complicates the control of divalent cations concentration in industry flotation, but within a suitable range, both copper grade and recovery can be enhanced.
MINERALS ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Xiaoyao Wang, Benbing Shi, Hao Yang, Jingyuan Guan, Xu Liang, Chunyang Fan, Xinda You, Yanan Wang, Zhe Zhang, Hong Wu, Tao Cheng, Runnan Zhang, Zhongyi Jiang
Summary: In this study, ionic covalent organic framework membranes (iCOFMs) with high ion exchange capacity were prepared using a dual-activation interfacial polymerization strategy. The reaction at the water-organic interface was accelerated after dual-activation, leading to iCOFMs with high crystallinity and prominent proton conductivity. These covalent organic framework-based membranes are highly tunable and have potential applications in various fields.
NATURE COMMUNICATIONS
(2022)
Article
Polymer Science
Yucheng Peng, Brian Via
Summary: Pre-treatments such as homogenization or ultrasonication can significantly decrease the viscosity of CNC suspensions and affect the degree of crystallinity of the films formed. The viscosity of the suspension changed with time after treatment and settling in room conditions led to an increase in viscosity. UV and visible light interferences varied for films generated from differently treated suspensions.
Article
Engineering, Environmental
Karl Zimmermann, Jaycee Wright, Pierre Berube, Benoit Barbeau, Madjid Mohseni
Summary: This study confirms the effectiveness and feasibility of Biological Ion Exchange (BIEX) technology in removing dissolved organic carbon (DOC). Results show that BIEX technology can achieve DOC removal levels ranging from 32% to 50% when treating inlet water with low or high sulphate and DOC concentrations. Additionally, the study found that in the secondary ion exchange mechanism, the removed anions directly exchange in charge equivalence with the released anions.
Article
Engineering, Environmental
Yun Lee, Jin-Hyung Noh, Ji-Won Park, Seon-Won Yoon, Sang-Yeob Kim, Hee Jong Son, Woorim Lee, Sung Kyu Maeng
Summary: Ion exchange resins are commonly used to remove natural organic matter from drinking water, but disposing of the used brine can be problematic. This study explores the use of a hybrid biological ion exchange and activated carbon system for drinking water treatment, which proves to be the most effective method for removing natural organic matter and reducing the formation of disinfection byproducts.
Article
Chemistry, Physical
Amit Pandey, Sabiha Hashmi, Velavan Kathirvelu, Keisham S. Singh, Arijit Sengupta
Summary: The study investigated the impact of structural modification of C(n)mimNTf(2) ionic liquid and a ligand on the extraction properties of actinides, revealing different extraction mechanisms in ionic liquids with varying alkyl chain lengths and slower extraction processes compared to molecular diluents.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Multidisciplinary
Colin H. Peterson, Jay R. Werber, Hyung Kae Lee, Marc A. Hillmyer
Summary: We successfully prepared mesoporous polymer microspheres with uniform pore size using aqueous suspension polymerization. The size and pore size of the microspheres can be independently controlled, and they exhibit a nanostructured bicontinuous morphology. We also demonstrated the incorporation of functional pore walls and showed the high efficiency of the microspheres in dye removal. This method has great potential for applications in catalysis, chromatography, and water remediation.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Applied
Preeti Waribam, Kanticha Jaiyen, Chanatip Samart, Makoto Ogawa, Guoqing Guan, Suwadee Kongparakul
Summary: This study developed a hybrid composite proton exchange membrane (PEM) for proton transfer in water electrolysis. The addition of MXene-Cu2O composite promoted the oxidative stability of the composite PEM, improving the efficiency and hydrogen production. This provides a potential choice for the application of water electrolysis technology.
Review
Chemistry, Physical
Aranee Teepakakorn (Pleng), Makoto Ogawa
Summary: This article summarizes the studies on the interactions between water-soluble polymers and layered clay minerals, aiming to clarify the structure-property relationship in these hybrids. The reported applications of hybrids of layered clay minerals and water-soluble polymers include solid-electrolyte and gas barrier film for packaging, with additional examination on stability and self-healing characteristics necessary for practical applications.
APPLIED CLAY SCIENCE
(2022)
Article
Chemistry, Physical
Aranee Teepakakorn Pleng, Takayuki Hayakawa, Makoto Ogawa
Summary: This study investigated the immobilization of rhodamine 6G and polyvinylpyrrolidone in purified bentonite. The successful intercalation of the dyes and polymer into the interlayer space of the bentonite was confirmed, and superior stability was observed under heating and sunlight irradiation conditions.
APPLIED CLAY SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Thipwipa (Tip) Sirinakorn, Taya (Ko) Saothayanun, Donhatai (Ammy) Sruamsiri, Makoto Ogawa
Summary: The study prepared layered cesium titanate (Cs2Ti5O11) with an elongated rectangular particle shape by size reduction, and found that the size-reduced H2Ti5O11 exhibited higher activity in photocatalytic H-2 production compared to pristine Cs2Ti5O11.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Chemistry, Multidisciplinary
Aniruddha Nag, Takayuki Hayakawa, Makoto Minase, Makoto Ogawa
Summary: An organophilic clay, obtained by intercalation technique, acts as a support to assemble polyaromatic molecules and form luminescent hybrids with high luminescence efficiency, showing great potential for various applications.
Article
Nanoscience & Nanotechnology
Kanji Saito, Kodai Inaguma, Makoto Ogawa, Pham Thi Ha, Hayato Akiyama, Shuhei Yamaguchi, Hiroyuki Minokoshi, Masataka Ogasawara, Sumio Kato
Summary: The preparation temperature was optimized for enhanced photocatalytic H2 production of a lepidocrocite-type layered potassium lithium titanate. The particle size, crystallinity, and photocatalytic activity of the material were influenced by the preparation temperature. Nanoparticles prepared at 700 degrees C showed the highest H2 production performance.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Applied
Krittachai Vejchakul, Taya Saothayanun, Alisa Phuekphong, Navarut Paengjun, Makoto Ogawa
Summary: This study examines the room temperature crystallization of anatase on spherical particles of resorcinol-formaldehyde resin and demonstrates its application as a photocatalyst for hydrogen evolution.
JOURNAL OF POROUS MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Soontaree (Grace) Intasa-Ard, Makoto Ogawa
Summary: This study examined homogeneous precipitation using urea hydrolysis under hydrothermal conditions to prepare carbonate type magnesium aluminium layered double hydroxides (Mg/Al-CO3 LDHs). Well-crystallized Mg/Al-CO3 LDHs with a rosette-like shape and a radius of approximately 2-4 μm were successfully synthesized by optimizing the reaction conditions. The heating rate and reaction temperature were found to be important factors, and the Mg/Al ratio in the initial solution influenced the composition and morphology of the products.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Nattanee Dechnarong, Makoto Ogawa
Summary: Novel emulsification was observed in an aqueous clay mineral suspension (synthetic hectorite) and a solution of polyvinyl butyral in 1-butanol without the use of surfactants. The size of the oil droplets depended on the concentration of polyvinyl butyral solution and aqueous clay suspension. The high viscosity of the clay suspension resulted in shearing forces that led to smaller oil droplets. The clay mineral was found to be in the water phase, not at the oil-water interface. The emulsion exhibited thermal stability up to 80 degrees C and was successfully used as a platform for the photochromic reaction of spiropyran.
Article
Chemistry, Physical
Tetsuo Yamaguchi, Kamonnart Jaa Imwiset, Min Gyeong Choi, Jae-Min Oh, Sae Youn Lee, Makoto Ogawa
Summary: To achieve high photoluminescence quantum yield, a hybrid material consisting of a thermally activated delayed fluorescent dye and an organophilic layered silicate was synthesized. The molecular conformation and flexible assembly of the dye in the silicate allowed efficient utilization of the dye's excited state transitions and suppressed concentration quenching. Moreover, the presence of the organophilic silicate protected the dye's triplet state from oxygen, resulting in increased photoluminescence quantum yield.
APPLIED CLAY SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Donhatai Sruamsiri, Atsushi Shimojima, Makoto Ogawa
Summary: In this study, a novel floating adsorbent was designed by surface modification of layered alkali silicate to collect metal ions from water. The modified silicate demonstrated buoyancy at the air-water interface and showed higher adsorption capacity compared to common nonfloating adsorbents. Characterization techniques confirmed the successful grafting of the silane coupling reagent on the external surface of the modified silicate particles.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
Siraphat Jan Cheepborisutikul, Makoto Ogawa
Summary: Anatase/silica core/shell particles were prepared with varying sizes (9, 22, and 111 nm) by coating tetraethyl orthosilicate on anatase particles. The thickness of the silica layer was controlled by repeating the coating procedure. The presence of silica coating inhibited the transformation of anatase to rutile and suppressed crystal growth of titania. The heated products could be dissolved to obtain size-controlled anatase and rutile particles.
INORGANIC CHEMISTRY
(2023)
Review
Chemistry, Applied
Krittachai Vejchakul, Makoto Ogawa
Summary: In this review, methods for precise design of titanium dioxide particles using porous templates are summarized, with a focus on the use of nanoporous material SBA-15 as a template. Synthetic methods and characterization techniques are extensively examined for the precise design of nanoarchitecture in titanium dioxide-nanoporous solids.
TOPICS IN CATALYSIS
(2023)
Article
Chemistry, Inorganic & Nuclear
Tosapol Maluangnont, Phieraya Pulphol, Kanisorn Klangvijit, Khemjiranee Bowornthommatadsana, Narong Chanlek, Makoto Ogawa, Winadda Wongwiriyapan
Summary: Ball milling of solids under benign conditions can lead to surface functionalization without altering the crystal structure and morphology. However, these surface functional groups are rarely fixed and instead migrate across the ball milled solids. This phenomenon, and its effects on electrochemical and electrical properties, have been limitedly studied.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Rattanawadee Ploy Wijitwongwan, Taya Ko Saothayanun, Makoto Ogawa
Summary: NiFe layered double hydroxides (LDHs) intercalated with dioctyl sulfosuccinate were prepared by co-precipitation, and the intercalated anion was exchanged with carbonate. The basal spacing of the LDHs varied depending on the Fe3+/(Ni2+ + Fe3+) ratio, with larger spacing achieved at smaller ratios. This indicates that the Fe3+/(Ni2+ + Fe3+) ratios are associated with the layer charge density of NiFe-LDHs.
DALTON TRANSACTIONS
(2023)
