Article
Chemistry, Physical
Guo-qiang Feng, Wen-de Tian
Summary: The desorption of a self-propelling filament from an attractive surface was studied using computer simulations, investigating the effects of activity, chain length, and chain rigidity. Different scaling regimes were observed for the desorption time versus activity for a flexible filament, with varying scaling exponents. The desorption behavior at low activity was found to be influenced by spiral-like detachment kinetics, while at high activity, the desorption process resembled the escape mechanism of a super-diffusive blob from a potential well at a short time scale. The desorption time was also influenced by chain length and chain stiffness, with non-monotonic behaviors observed.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Electrochemistry
Tamas Pajkossy
Summary: A theory is proposed to analyze voltammograms and dynamic electrochemical impedance spectroscopy (dEIS) measurements of diffusion-hindered adsorption processes. The theory allows for the calculation of adsorption kinetics and isotherm parameters from a set of voltammograms taken at different scan-rates. The theory also includes the analysis of high frequency impedance spectra measured during potential scans. The presented theory synthesizes previous theories on diffusion-controlled charge transfer and adsorption, and supports the determination of rate coefficients as a function of electrode potential using fast dEIS measurements.
ELECTROCHIMICA ACTA
(2023)
Article
Environmental Sciences
Devesh Bhatt, Anjana Srivastava, P. C. Srivastava
Summary: This study investigates the adsorption kinetics of boscalid onto ten Indian soils with different physico-chemical properties. The results reveal that the adsorption of boscalid is influenced by soil properties and is potentially controlled by the diffusion-chemisorption and intra-particle diffusion processes. Regression analysis of soil properties can improve the prediction of adsorbed amounts and kinetic constants of boscalid, providing insights into its fate and potential transport in different soils.
Article
Engineering, Environmental
Hanif Subhan, Sultan Alam, Luqman Ali Shah, Noor Saeed Khattak, Ivar Zekker
Summary: This study addresses the removal of noxious dyes and oils from industrial discharges using a new type of hydrogel material. The hydrogel has excellent swelling and sorption properties, making it suitable for industrial and environmental applications.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Zaixing Li, Ying Zhang, Yunmeng Cao, Shilei Zhou, Yonghui Han, Lin Yue
Summary: The novel adsorbent Sn-MOF showed effective adsorption for Acid Red 3R, with chemisorption significant in the process and adsorption limited by both intraparticle diffusion and film diffusion. After photocatalytic regeneration treatment, the adsorption capacity of Sn-MOF remained stable even after six cycles.
Article
Engineering, Environmental
Mahua Jahan Rupa, Animesh Pal, Sourav Mitra, Bidyut Baran Saha
Summary: This paper presents a new kinetics model to precisely describe the adsorption dynamics for different adsorbate-adsorbent pairs. The proposed model accurately predicts the adsorption dynamics during initial unsaturated condition as well as near saturated condition, making it suitable for predicting adsorption system performance for both short and long cycle times. The most significant drawback of traditional kinetics models has been their time-dependent deviation from experimental data.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Fitfety M. Teshager, Nigus G. Habtu, Kibret Mequanint
Summary: This study demonstrates the efficient removal of cellulose-reactive anionic dyes using water hyacinth root powder (WHRP) bioadsorbent. By adjusting adsorption conditions such as pH, adsorbent dose, dye concentration, particle size, mixing speed, and temperature, the adsorption performance can be effectively enhanced. The adsorption process exhibits spontaneity and exothermicity in terms of Gibbs free energy and enthalpy, and is controlled by multiple mechanisms.
Article
Environmental Sciences
Masahiro Umehara, Yoshiaki Kumamoto, Kenta Mukai, Akira Isogai
Summary: The adsorption isotherms, kinetics, and thermodynamics of fluoride ions (F-) on FeOOH powders in water were studied. The results showed that FeOOH/TOCN powder is an excellent and efficient F- adsorbent in water. The adsorption of F- on FeOOH initially formed a monolayer through physical adsorption, and the adsorption kinetics followed the pseudo-second-order model. The thermodynamic analysis indicated that the adsorption process was spontaneous in water.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Chuncai Yao, Chenxi Zhu
Summary: A new multi-mechanism kinetic model for batch adsorption is proposed in this study, where a dimensionless parameter serves as a mechanism indicator. The model can convert to different adsorption kinetics models as the dimensionless parameter changes values. The estimated mass transfer coefficients show a reasonable agreement with literature values.
SURFACES AND INTERFACES
(2021)
Article
Multidisciplinary Sciences
Heng Zeng, Mo Xie, Ting Wang, Rong-Jia Wei, Xiao-Jing Xie, Yifang Zhao, Weigang Lu, Dan Li
Summary: Metal-organic frameworks (MOFs) are known for their precise control of structures and functions on a molecular level, but designing local flexibility in the MOF framework for dynamic molecular sieving remains challenging. A newly reported MOF material, JNU-3a, features one-dimension channels with embedded molecular pockets that can selectively adsorb propylene and propane under different pressures, showcasing the potential of dynamic molecular sieving.
Article
Materials Science, Paper & Wood
Liyao Cao, Hongchang Wang, Hua Shen, Ruiliu Wang, Fumei Wang, Guangbiao Xu
Summary: This study investigated the adsorption behaviors of human-like collagen on alkali-modified Kapok fiber. The results showed that alkali treatment significantly increased the adsorption amount of the fiber. The modified fiber had a rough surface with vertically arranged grooves. The study also found that the kinetics of collagen adsorption followed both physisorption and chemisorption models. These findings suggest that alkali-modified Kapok fiber has the potential to be used as a highly absorbent material for collagen-based dressings.
Article
Chemistry, Multidisciplinary
Keerthana Erattemparambil, Lakshmi Mohan, Nirmala Gnanasundaram, Rambabu Krishnamoorthy
Summary: Activated carbon coated on glass beads was used for the adsorption of phenol. Both batch and column adsorption studies were conducted, and kinetic and thermodynamic parameters were evaluated. The results showed that the adsorption process followed pseudo-second-order kinetics and was endothermic and non-spontaneous. The Temkin isotherm model was found to have the best fit, and the system was determined to be physisorption in nature.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Environmental Sciences
Md Shahinoor Islam, Jin-Hyeob Kwak, Christopher Nzediegwu, Siyuan Wang, Kumuduni Palansuriya, Eilhann E. Kwon, M. Anne Naeth, Mohamed Gamal El-Din, Yong Sik Ok, Scott X. Chang
Summary: Biochar's effectiveness in removing contaminants, especially heavy metals, from water depends on biomass type and the purging gas used during production; the sorptive capacity of biochar is mainly influenced by biomass type and varies for different heavy metals based on the Langmuir adsorption model.
ENVIRONMENTAL POLLUTION
(2021)
Article
Nanoscience & Nanotechnology
Jinwook Lee, Kyeongeun Lee, Jooyoun Kim
Summary: The study found that the sol-gel impregnation method achieves the highest efficiency in loading ZIF-8, with the maximum adsorption efficiency depending on the optimal loading of ZIF-8, while exceeding a certain level can decrease adsorption efficiency.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Davide Ripepi, Herman Schreuders, Fokko M. Mulder
Summary: The use of H permeable electrodes to synthesize ammonia from N-2, water and electricity has been studied, achieving stable reaction and high ammonia production efficiency, which provides a strong support for the development of green ammonia synthesis process.
Article
Energy & Fuels
Kentaro Hatagami, Fuminao Kishimoto, Yudai Kawase, Tomohiro Higashi, Vikas Nandal, Kazuhiko Seki, Kazuhiro Takanabe
Summary: Efficiency of photoelectrochemical overall water splitting using a single n-type semiconducting photoanode depends on various requirements. By incorporating an n-type thin modification surface layer over an n-type photon absorber, it is possible to reduce the onset potential of the photoanode and facilitate bias-free solar water splitting. These findings could provide valuable design guidelines for effective photoanodes using an n-type surface modification layer.
Article
Nanoscience & Nanotechnology
Lixian Jiang, Kazuhiro Kirihara, Vikas Nandal, Kazuhiko Seki, Masakazu Mukaida, Shohei Horike, Qingshuo Wei
Summary: Ferricyanide/ferrocyanide/guanidinium-based thermoelectrochemical cells were investigated in this study under different loading conditions. The device with guanidinium-added electrolytes exhibited higher power and energy densities compared to ferricyanide/ferrocyanide-based devices. The enhanced performance was attributed to the configuration entropy change resulting from the selective binding of Gdm(+) to Fe(CN)(6)(4-), rather than the ionic Seebeck effect. However, the guanidinium-added electrolyte device did not show steady-state operation due to difficulties in Fe(CN)(6)(3-) diffusion and precipitation of (Gdm(+))(n) [Fe(CN)(6)(4-)]. Nevertheless, the performance recovered once the device was disconnected from external loading. Self-powered sensors were successfully fabricated using four flexible cells in series, which could wirelessly transmit humidity, temperature, and air pressure data using body heat. Therefore, ferricyanide/ferrocyanide/guanidinium is a promising electrolyte material for low-grade energy harvesting applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Kazuhiko Seki, Koichiro Saiki
Summary: Recent studies using radiation-mode optical microscopy (Rad-OM) have observed the real-time growth of monolayer domains in graphene. The rate-determining factor for chemical vapor deposition growth of graphene is found to change from incorporation reaction-limited to diffusion-limited as the domain size increases, resulting in decelerated domain growth. The transition to diffusion-limited growth is likely caused by either the increase of the periphery length of a single domain or the interference of diffusion fields from adjacent domains.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Physics, Applied
Kazuhiko Seki, Masakazu Mukaida, Qingshuo Wei, Takao Ishida
Summary: The conventional figure of merit and power factor is not sufficient to measure the quality of thin film thermoelectric materials. By considering film dimensions, effective figure of merit and Seebeck coefficient are introduced to improve the energy conversion efficiency. The dependence of effective figure of merit and power factor on thickness is studied using Bi2Te3 and PEDOT materials.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Tomohiro Higashi, Kazuhiko Seki, Yutaka Sasaki, Yuriy Pihosh, Vikas Nandal, Mamiko Nakabayashi, Naoya Shibata, Kazunari Domen
Summary: This study investigated the HER of Rh nanoparticles coated with an ultrathin layer of Cr-oxides as a model electrode for the Cr2O3/Rh-metal core-shell-type cocatalyst system. The CrOx layer on RhNP facilitated the electron transfer process, leading to increased current density for the HER. It was found that the CrOx layer promoted proton transfer to the RhNP surface and restricted electron transfer from the FTO to the electrolyte and/or RhNP, resulting in efficient photocatalytic water splitting.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Kazuhiko Seki, Naoya Muramatsu, Tomoaki Miura, Tadaaki Ikoma
Summary: The time-of-flight method is used to characterize the transport properties of semiconductors. In this study, the effects of in-depth carrier injection on transient currents and optical absorption under pulsed-light excitation were investigated. The results provide insights into the interpretation of power-law exponent in the photocurrent decay.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Kazuhiko Seki, Tomoaki Miura, Tadaaki Ikoma
Summary: Triplet-triplet annihilation (TTA) is a process that combines low electronic energies in two molecules to form high electronic energy in one molecule, enabling high-efficiency conversion using low-intensity light. This process has been observed in solutions, but the complexity of TTA kinetics in solid matrixes has not been fully understood.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Yuriy Pihosh, Vikas Nandal, Ryota Shoji, Raman Bekarevich, Tomohiro Higashi, Valeria Nicolosi, Hiroyuki Matsuzaki, Kazuhiko Seki, Kazunari Domen
Summary: The development of high-performance solar-water-splitting technologies is limited by poor solar light absorption and charge separation. In this study, we overcome these challenges by developing photoanodes made from polycrystalline tantalum nitride nanorods (Ta3N5 NRs). Optimized morphology and crystalline properties of Ta3N5 NRs result in a significant increase in photocurrent for water oxidation activity. Factors such as charge carrier lifetime and diffusion length contribute to the enhanced performance. This research highlights the importance of designing narrow-energy band-gap photoanodes for efficient solar-water-splitting devices.
ACS ENERGY LETTERS
(2023)
Article
Multidisciplinary Sciences
Lixian Jiang, Shohei Horike, Masakazu Mukaida, Kazuhiro Kirihara, Kazuhiko Seki, Qingshuo Wei
Summary: An isotropic thermo-electrochemical cell with a high Seebeck coefficient (S-e) of 3.3 mV K-1 using a ferricyanide/ferrocyanide/guanidinium-based agar-gelated electrolyte is introduced. It achieves a power density of about 20 mu W cm(-2) at a temperature difference of about 10 K, regardless of the heat source position. The novel system represents a significant advancement in harvesting low-temperature heat due to its large S-e value and isotropic properties.
Article
Chemistry, Multidisciplinary
Hiroaki Yoshida, Zhenhua Pan, Ryota Shoji, Vikas Nandal, Hiroyuki Matsuzaki, Kazuhiko Seki, Lihua Lin, Masanori Kaneko, Tsuyoshi Fukui, Koichi Yamashita, Tsuyoshi Takata, Takashi Hisatomi, Kazunari Domen
Summary: This study successfully synthesized a highly efficient Gd2Ti2O5S2 photocatalyst capable of driving photocatalytic reactions, and improved the production efficiency of hydrogen and oxygen by loading ultrafine Pt-IrO2 cocatalyst particles. The material exhibited remarkable apparent quantum efficiency within the visible light absorption range and showed good stability during oxygen evolution. These results demonstrate the potential application of this narrow-band gap oxysulfide photocatalyst in practical solar hydrogen production.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Lihua Lin, Pongpen Kaewdee, Vikas Nandal, Ryota Shoji, Hiroyuki Matsuzaki, Kazuhiko Seki, Mamiko Nakabayashi, Naoya Shibata, Xiaoping Tao, Xizhuang Liang, Yiwen Ma, Takashi Hisatomi, Tsuyoshi Takata, Kazunari Domen
Summary: In this study, a flux-assisted technique was used to synthesize YTOS particles, which significantly reduced the preparation time by enhancing mass transfer efficiency. The resulting YTOS exhibited improved photocatalytic activity for hydrogen and oxygen evolution when loaded with Rh and Co3O4 co-catalysts, respectively.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Sangyoub Lee, Sergey D. Traytak, Kazuhiko Seki
Summary: The Cattaneo-Vernotte model is modified to account for the effect of reactions on momentum relaxation in transport equations. The inertial effect influences the reaction rate coefficient differently depending on the nature of the reaction. A modified Smoluchowski equation is used to express the momentum relaxation effect, with additional terms depending on the relative velocity of reactants.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Dharmapura H. K. Murthy, Vikas Nandal, Akihiro Furube, Kazuhiko Seki, Ryuzi Katoh, Hao Lyu, Takashi Hisatomi, Kazunari Domen, Hiroyuki Matsuzaki
Summary: The charge carrier dynamics of aluminum-doped SrTiO3 (Al:SrTiO3) were investigated, revealing that Al doping significantly prolongs carrier lifetime and the crucial electron extraction process by the Rh cocatalyst occurs before carrier decay. In contrast, electron extraction in SrTiO3 is slower than carrier lifetime, reducing the photocatalytic efficiency. In situ charge carrier dynamics at the water interface provide mechanistic insights into the enhancement of overall water splitting activity induced by Al doping.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Yuriy Pihosh, Vikas Nandal, Tomohiro Higashi, Ryota Shoji, Raman Bekarevich, Hiroshi Nishiyama, Taro Yamada, Valeria Nicolosi, Takashi Hisatomi, Hiroyuki Matsuzaki, Kazuhiko Seki, Kazunari Domen
Summary: Designing photoanode semiconducting materials with visible-light absorption and minimal charge-carrier recombination for achieving efficient solar-to-hydrogen (STH) conversion is challenging. Hybrid Ta3N5 nanorods and thin films are developed on transparent GaN/Al2O3 substrates to overcome these challenges and achieve high-performance STH energy conversion.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Tatsuya Chugenji, Zhenhua Pan, Vikas Nandal, Kazuhiko Seki, Kazunari Domen, Kenji Katayama
Summary: This study revealed the electron and hole trapping and recombination processes in oxysulfides using time-resolved microscopic technique in combination with clustering analysis. The effect of rhodium cocatalyst in providing a new electron pathway was discussed based on phenomenological simulation, indicating possible reasons for the decay of charge carriers in oxysulfides.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
