Article
Chemistry, Analytical
Jun-Gyu Kim, Jun-Yeop Lee
Summary: This study investigated the sorption affinity of iodide on organo-bentonite modified with HDPy, optimizing the iodine-starch method coupled with UV/Vis absorption spectroscopy and analyzing the influence of various factors on iodide sorption affinity.
Article
Chemistry, Physical
Qiang Li, Romain Berraud-Pache, Yongjie Yang, Christelle Souprayen, Maguy Jaber
Summary: This study synthesized a bio-organoclay by modifying bentonite with natural soybean lecithin, and analyzed the effects of different factors on the properties of the modified bentonite. The results showed that reaction time and temperature had little impact on the properties of the modified bentonite, while an increase in pH and lecithin concentration significantly increased the interlayer space.
APPLIED CLAY SCIENCE
(2023)
Article
Environmental Sciences
Fangfei Cai, Funing Ma, Xiaoying Zhang, Paul Reimus, Linlin Qi, Yu Wang, Di Lu, Hung Vo Thanh, Zhenxue Dai
Summary: This study investigated the sorption characteristics of strontium (Sr) on granite, as well as the coexistence system of granite and colloids under various hydrogeochemical conditions. The results showed that the concentration of bentonite colloids significantly affected Sr sorption, while pH and ionic strength played crucial roles in the process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Petroleum
Emanuel Ricky, Musa Mpelwa, Chao Wang, Bahati Hamad, Xingguang Xu
Summary: Drilling fluid rheology and fluid loss properties are crucial for drilling operations, especially under high temperatures. This study synthesized and characterized modified corn starch as an environmentally friendly rheology enhancer and filtration loss controlling agent for water-based mud. Experimental results showed that MCS outperformed traditional additives in improving rheological properties and controlling fluid loss, with biodegradability properties.
Article
Engineering, Geological
Zhang-Rong Liu, Wei-Min Ye, Jiang-Cheng Zhu, Yong-Gui Chen, Qiong Wang
Summary: This paper investigates the effect of alkaline solution infiltration on the swelling pressure and hydraulic conductivity of bentonite pellet mixtures in a high-level radioactive waste repository. The results show that increasing alkaline concentration and temperature deteriorate the swelling pressure and increase the hydraulic conductivity. When the alkaline concentration reaches 1.0 M, the swelling pressure decreases and the hydraulic conductivity decreases.
Article
Environmental Studies
Jiyeon Choi, Dong-Ik Song, Won Sik Shin
Summary: This study investigated the sorption of phenol and 4-chlorophenol on natural bentonite modified with HDTMA cation. Different models, such as PDM, were found to accurately predict the sorption behavior. In binary sorption systems, 4-CP showed higher selectivity compared to phenol, resulting in reduced sorbed volume and wider distribution in competition scenarios.
ENERGY & ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Yulia Izosimova, Irina Gurova, Inna Tolpeshta, Michail Karpukhin, Sergey Zakusin, Olga Zakusina, Alexey Samburskiy, Victoria Krupskaya
Summary: This paper investigates the adsorption regularities and mechanisms of nonradioactive Cs(I) and Sr(II) analogs on bentonites with different chemical and mineral composition. The main mechanism is ion exchange, leading to the formation of outer-sphere complexes and, at higher pH values, inner-sphere complexes. Bentonite T exhibits higher adsorption capacity compared to other bentonites.
Article
Engineering, Environmental
Fan Yang, Zibo Xu, Yuandong Huang, Daniel C. W. Tsang, Yong Sik Ok, Ling Zhao, Hao Qiu, Xiaoyun Xu, Xinde Cao
Summary: This study investigated the effects of soil minerals on the release of dissolvable biochar from biochar particles, with bentonite and goethite selected as model minerals. It was found that the presence of soil minerals and Ca2+ reduced the release of dissolvable biochar and enhanced its stability, reducing both chemical oxidation and biodegradation extents. The interactions between soil minerals and dissolvable biochar play a crucial role in the long-term carbon sequestration capability of biochar.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Construction & Building Technology
Yong-Gui Chen, Xiao-Xiao Zhang, Xue-Min Liu, Wei-Min Ye, Qiong Wang
Summary: This study investigates the effect of graphene content and dry density on the swelling properties of graphene-modified bentonite. The results show that the swelling pressure and pore distribution are significantly influenced by the graphene content and dry density. The findings provide valuable insights into the design of buffer materials for deep geological disposal.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Chemical
Hajar Merrikhpour, Sara Mobarakpour, Seyedeh Bahareh Azimi
Summary: This study investigates the adsorption capacity of modified bentonite for heavy metal ions in water. The results show that SDS modified bentonite can enhance the adsorption capacity of the natural adsorbents, with the best performance observed at 40 mM.
DESALINATION AND WATER TREATMENT
(2022)
Article
Chemistry, Multidisciplinary
Zihao Meng, Jian Wu, Qingyun Li, Youyan Liu, Aixing Tang
Summary: In this study, the lipase OF from Candida cylindracea was adsorbed onto surfactant-modified Na-bentonite, and the effects of the surfactants on the catalytic properties of immobilized lipase were investigated. It was found that the specific activity and enzyme loading of immobilized lipase were significantly influenced by the modified support with different surfactants. Surprisingly, a co-modification with two surfactants resulted in an activation of the immobilized enzyme. Kinetic analyses showed a decrease in Km and an increase in Vmax for the hydrolysis reaction. Moreover, the hydrophobicity and functional group changes caused by the surfactant modification were identified as the key factors affecting lipase immobilization.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2023)
Article
Metallurgy & Metallurgical Engineering
O. Alekseeva, A. N. Rodionova, S. A. Syrbu, N. A. Bagrovskaya, A. Noskov
Summary: The modification of polystyrene (PS) with bentonite resulted in film materials with improved sorption properties for macroheterocyclic compounds. The efficiency of adsorption of meso-phenylporphyrin iodide on the PS-bentonite composite was found to increase threefold compared to unmodified polymer. The adsorption of meso-phenylporphyrin iodide on the composite occurs through donor-acceptor interaction between the porphyrin reaction centers and oxygen-containing groups of the composite, as revealed by IR spectroscopy.
PROTECTION OF METALS AND PHYSICAL CHEMISTRY OF SURFACES
(2021)
Article
Green & Sustainable Science & Technology
Chandra B. Gupt, Sanandam Bordoloi, Sreedeep Sekharan
Summary: The pH-dependent contaminant retention characteristics of clay-based composites were studied for the design and functionality of landfill liner materials. The effectiveness of four fly ash mixes in bentonite-fly ash composites was investigated for lead retention under both controlled (pH = 5) and uncontrolled pH conditions. The results showed that the retention capacity of the composites and parent materials was higher under uncontrolled pH conditions, and the B-FA mixes with a pH > 10.5 were the most effective adsorbents.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Biochemistry & Molecular Biology
Yi Pan, Xinyue Zhang, Qianru Zhan, Shuangchun Yang, Yanchao Wang, Jian Guan, Gang Yang, Peng Yang, Zain Ullah Abdul Qayum
Summary: In this study, a temperature-sensitive modified bentonite based on NIPAM was developed through intercalation modification. The results showed that the synthesized bentonite exhibited good temperature sensitivity and rheological properties in the range of 40-70 degrees Celsius.
Article
Chemistry, Physical
Qi Cui, Bing Chen, Lei Lang, Yongrui Wang
Summary: This study investigates and compares the impact of the wet process and the semi-dry process on the properties of polymer-modified bentonite. Response surface methodology is used to establish relationship models between various factors and the swell index. It is found that the semi-dry process results in greater expansibility and the dosage of CMC is a critical factor affecting performance. Recommendations are made for practical production based on the findings. Microscopic experiments reveal that the semi-dry process leads to a higher degree of exfoliation and stronger interactions between the polymer and bentonite, resulting in better modification effects.
APPLIED CLAY SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Xiaodong Shao, Mengfang Liang, Min Gyu Kim, Sara Ajmal, Ashwani Kumar, Xinghui Liu, Hyun Seung Jung, Haiyan Jin, Fengliang Cao, Jianmin Yu, Kim My Tran, Hyun Ko, Jinsun Lee, Jong Wook Bae, Hyoyoung Lee
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Byung-wook Park, Jincheol Kim, Tae Joo Shin, Yung Sam Kim, Min Gyu Kim, Sang Il Seok
Summary: This study reports an approach and mechanism for minimizing proton defects in alkylammonium lead trihalide perovskite (ALHP) crystals by adding ionized halides to the perovskite precursor solution. The researchers found that the ionized halides induced proton transfer from H2O to the alkylammonium cation in the precursor solution, stabilizing the ALHP crystals. By examining the fundamental characteristics of ALHP and its precursors, the findings from this work will guide the development of highly stable ALHP crystals, enabling efficient and stable optoelectronic ALHP devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Haiyan Jin, Miran Ha, Min Gyu Kim, Jong Hoon Lee, Kwang S. Kim
Summary: In this study, a novel atomically dispersed catalyst Pt@VNC consisting of Pt single atoms, Pt-Pt/V dual atoms, and small clusters supported on a vanadium and nitrogen co-doped carbon (VNC) surface is synthesized. By introducing atomically dispersed V sites and V2O5 clusters, the coordination structures of Pt atoms are modulated, showing extraordinary activity for the hydrogen evolution reaction. The synergistic effect of single atoms and clusters contributes to the low charge transfer resistance, fast reaction kinetics, superior catalytic efficiency, and robust durability of Pt@VNC.
ADVANCED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoqian Wei, Zijian Li, Haeseong Jang, Min Gyu Kim, Qing Qin, Xien Liu
Summary: Surface strain tuning in a coupled heterostructure efficiently enhances the catalytic performance of Bi2O2CO3/ZnO heterojunction catalysts for CO2 electroreduction. Charge transfer from Zn atoms to Bi atoms and compressive stress on the catalyst surface are crucial in promoting CO2 capture, activation, and subsequent electrochemical reduction to formate.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Physical
Jaechan Ryu, Joohyuk Park, Jihan Park, Min Gyu Kim, Minjoon Park
Summary: In this study, high-purity carbon nitride nanotubes filled with iron and copper phthalocyanine nanorods were synthesized by using a supercritical fluid with fast reaction kinetics. The preserved Fe-N4 and Cu-N4 sites inside the carbon nitride nanotubes were observed. The atomically dispersed Fe-N4 and Cu-N4 dual-atom catalysts inside the carbon nitride nanotube showed a synergistic effect. The prepared sample exhibited promising bifunctional activities for oxygen reduction reaction and oxygen evolution reaction.
ENERGY STORAGE MATERIALS
(2023)
Article
Chemistry, Physical
Hee Jae Kim, Jae Hyeon Jo, Ji-Young Kim, Jiwon Jeong, Jae-Ho Park, Hun-Gi Jung, Kyung Yoon Chung, Min Gyu Kim, Naesung Lee, Kee-Sun Sohn, Yauhen Aniskevich, Eugene Streltsov, Seung-Taek Myung
Summary: We report an unexpected finding of de/protonation associated conversion reaction in K2V3O8 as a promising cathode material for zinc-ion batteries. Operando characterization techniques reveal the indispensable role of proton (H+) reaction for the conversion reaction. The conversion reaction exhibits large reversible capacity and activity even at high discharge rates, contributing to reaching the theoretical capacity for cathode materials of zinc-ion batteries.
ENERGY STORAGE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Lingling Wang, Yang Liu, Hongdan Wang, Taehun Yang, Yongguang Luo, Seungeun Lee, Min Gyu Kim, Ta Thi Thuy Nga, Chung-Li Dong, Hyoyoung Lee
Summary: In this study, a vanadium single-atom-dimer (V-O-V) catalyst structure on N-doped carbon was proposed for the electrochemical nitrogen reduction reaction. The density functional theory calculation revealed a loop evolution of an intermediate structure in the V-O-V catalyst, which showed excellent electrochemical activity for nitrogen reduction.
Article
Physics, Applied
Jae-Hyeon Cho, Ju-Hyeon Lee, Ji-Hun Park, Haeseong Jang, Hye-Lim Yu, Jongmoon Jang, Geon-Tae Hwang, Min Gyu Kim, Wook Jo
Summary: Multiferroic Fe-site engineered lead iron niobate (PFN) is prepared by substituting Fe with Ni, Co, and Cr. The study investigates the effect of spin configuration variation on magnetic and multiferroic properties. Different transition metals result in distinct magnetic orders, and Ni and Co substitution leads to magnetic-field-dependent magnetoelectric coupling at room temperature. This research can provide a general method for modulating the magnetic properties of multiferroic perovskite oxides.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Linhan Jian, Ming Li, Xinghui Liu, Guowen Wang, Xinxin Zhang, Min Gyu Kim, Yinghuan Fu, Hongchao Ma
Summary: In this study, a hierarchical dendritic Co3O4-SnO2 heterostructure was prepared via a sequential hydrothermal process for treating refractory organics. The size of the ultrathin SnO2 nanosheets can be controlled by the time of the secondary hydrothermal process. Ti/Co3O4-SnO2-168h showed a photoelectrocatalysis degradation rate of approximately 93.3% for a high dye concentrate, with good long-term cyclability and durability. The proposed type-II heterojunction between Co3O4 and SnO2 prevents carrier recombination and enhances the generation of active species.
Article
Multidisciplinary Sciences
Jaewang Park, Jongbeom Kim, Hyun-Sung Yun, Min Jae Paik, Eunseo Noh, Hyun Jung Mun, Min Gyu Kim, Tae Joo Shin, Sang Il Seok
Summary: Controlling the crystallinity and surface morphology of perovskite layers is crucial for achieving high-efficiency perovskite solar cells. By adding alkylammonium chlorides (RACl) to a-formamidinium lead iodide (FAPbI(3)), the crystallization process and surface morphology of the perovskite thin films can be controlled. The resulting perovskite thin layers facilitate the fabrication of perovskite solar cells with a high power-conversion efficiency of 26.08%.
Article
Chemistry, Physical
Liqiang Hou, Zijian Li, Haeseong Jang, Yu Wang, Xuemei Cui, Xiumin Gu, Min Gyu Kim, Ligang Feng, Shangguo Liu, Xien Liu
Summary: A rutile-structured ruthenium-zinc solid solution oxide with oxygen vacancies (Ru0.85Zn0.15O2-delta) is developed by a simple molten salt method. It exhibits ultralow overpotentials for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), and shows superior activity and durability for overall water splitting in different electrolytes.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Basit Ali, Raz Muhammad, Mobinul Islam, Daniel Adjah Anang, Da-Seul Han, Iqra Moeez, Kyung Yoon Chung, Min kyung Cho, Ji-Young Kim, Min-Gyu Kim, Kyung-Wan Nam
Summary: Cd2+ doping improves the electronic conductivity and capacity of Li4-xCdxTi5O12 anode material for lithium-ion batteries. The Cd-doped LTO electrodes demonstrate advantageous features, including enhanced cycling performance and high-rate capability.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ahmed Yousef Mohamed, Byoung Gun Han, Hyeonseo Jang, Jun Oh Jeon, Yejin Kim, Haeseong Jang, Min Gyu Kim, Kug-Seung Lee, Deok-Yong Cho
Summary: A Cu-deficient CuxInSe2 phase was successfully synthesized as a thin film using a two-step process. The study found that the loss of Cu in the compound resulted in changes in the chemical states and local structure of the Cu-Se-In tetrahedral networks, with a shorter In-Se bond and excessive oxidation of In ions. Furthermore, the narrowing of the bandgap was attributed to the reconstruction of the In3+ & delta; 5s orbital states, making the material suitable for photovoltaics.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Jitendra N. Tiwari, Muhammad Umer, Gokul Bhaskaran, Sohaib Umer, Geunsik Lee, Min Gyu Kim, Han-Koo Lee, Krishan Kumar, A. T. Ezhil Vilian, Yun Suk Huh, Young-Kyu Han
Summary: Progress in acidic water splitting has been limited by low oxygen evolution reaction (OER) activities, slow reaction kinetics, and catalyst degradation. In this study, t-phase ruthenium oxide atomic layers implanted on Mo2TiC2Tx MXene (RAL-M) were used as a model electrocatalyst for OER in acidic media, exhibiting remarkable mass activity and durability. Computational calculations reveal that RAL-M has strong affinity to oxygen species, enabling efficient water dissociation and accelerating the OER.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Nanoscience & Nanotechnology
Jinyeong Choi, Joohyuk Park, Jihan Park, Minsoo Kim, Soobeom Lee, Chae Ryong Cho, Jin Hong Lee, Yiseul Park, Min Gyu Kim, Jaewon Choi, Jun-Woo Park, Minjoon Park
Summary: Polyhedral binary cerium titanium oxide (CTO) is synthesized and applied as a composite electrocatalyst in aqueous zinc-vanadium redox flow batteries, resulting in high energy density and initial voltage efficiency.
ACS APPLIED MATERIALS & INTERFACES
(2023)
