Article
Chemistry, Inorganic & Nuclear
Zi-Rong Ye, Qun-Yan Wu, Cong-Zhi Wang, Jian-Hui Lan, Zhi-Fang Chai, Hong-Qing Wang, Wei-Qun Shi
Summary: Designing ligands with efficient actinide/lanthanide separation performance is crucial for the disposal of radioactive waste and the recovery of minor actinides. This study investigated the selective back-extraction of Am(III) over Eu(III) using hydrophilic hydroxylated triazolyl-based ligands. The results showed that Am-N bonds have more covalent character compared to Eu-N bonds. The ligand with the best selectivity for Am(III)/Eu(III) was found to have the largest difference in covalency between Am-N and Eu-N bonds.
INORGANIC CHEMISTRY
(2022)
Review
Engineering, Chemical
Shichao Feng, Xuebi Du, Jianquan Luo, Yongbing Zhuang, Junfeng Wang, Yinhua Wan
Summary: The emission of CO2 from human activities is the main cause of global warming. Membrane separation technology, particularly fixed CO2 carrier-facilitated transport membranes guided by z-complexation reactions, shows promising prospects for reducing CO2 emissions in fossil fuel utilization. This review discusses the theories of facilitated transport derived from z-complexation reactions for a comprehensive understanding and effective design of CO2 separation membranes. It also explores different fabrication strategies, such as polymer electrolyte membranes and mixed matrix membranes, for CO2-facilitated transport membranes. Future perspectives and potentials of z-complexation reaction-facilitated transport membranes are proposed.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Yamin Ma, Cheng Liu, Lishi Wang
Summary: A strategy for fast analysis of ion transfer/facilitated ion transfer in femtoliter water-in-oil droplets has been established. The study demonstrates that the half-wave potential is directly related to the transfer Gibbs free energy and logarithmic concentration of ions. The behavior of protamine transfer inside a single droplet has been thoroughly investigated, revealing significant differences under different conditions.
ANALYTICAL CHEMISTRY
(2022)
Article
Engineering, Chemical
Yafei Su, Shenzhen Cong, Meixia Shan, Yatao Zhang
Summary: A facilitated transport membrane was fabricated using a solution-casting method, containing zero-complex Ag(4)tz(4) and 6FDA-TMPDA, which showed excellent separation performance towards C3H6/C3H8 and great long-term stability, making it a promising candidate for gas separation applications.
Article
Energy & Fuels
Thi D. -T. Nguyen, Nhung Pham, Tam V. -T. Mai, Hoang Minh Nguyen, Lam K. Huynh
Summary: This study presents a detailed kinetic mechanism of the thermal decomposition of furyl radicals and analyzes the temperature- and pressure-dependent kinetic behaviors, revealing that decomposition pathways are more favorable than isomerization and skipping reactions occur at high temperature and/or low pressure. The reported kinetic mechanism can be confidently used to investigate furyl-related systems in different conditions.
Article
Materials Science, Ceramics
Rafael Aparecido Ciola Amoresi, Regiane Cristina de Oliveira, Leonelio Cichetto, Paula Mariela Desimone, Celso Manuel Aldao, Miguel Adolfo Ponce, Lourdes Gracia, Julio R. Sambrano, Elson Longo, Juan Andres, Alexandre Zirpoli Simoes
Summary: In this study, the structural, morphological, and electrical properties of CeO2 nanoparticles were investigated. The results showed a correlation between the shape/size of particles and surface types, number of carriers, density of vacancies, and local structural atomic order, as well as their influence on the electrical properties. The rod-like morphology exhibited better CO sensor response compared to the spherical morphology. Simulations using density functional theory were conducted to explore the mechanisms of CO adsorption and the behavior of the sensor in heterojunction-type samples.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Analytical
Yishan Fang, Haiqiang Deng, Xinjian Huang, Lishi Wang
Summary: The novel approach utilizes FT-SC-SV combined with ITIES interface for selective determination of cations or anions, providing a simple and sensitive platform for detection of a wide range of ions and neutral molecules. The method demonstrates feasibility and reliability in discriminating and quantifying apparently indistinguishable ion transfer, suggesting a new way for analytical detection of redox inactive ions.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Kaitlyn Doolittle Catlin, Julia Simmons, Shi Bai
Summary: A new and robust one-shot double-slice selection experiment is proposed to detect H-1 NMR signals of biphasic systems simultaneously. The resultant spectrum contains opposite-phased peaks representing the chemical species from the two phases, respectively.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Biotechnology & Applied Microbiology
Pouria Zarei, Ali Haghighi Asl, Rezvan Torkaman, Mehdi Asadollahzadeh
Summary: The development of membrane processes is an effective strategy to improve separation process efficiency. This study examined lanthanum extraction with organic phosphorus extractants in a laboratory system, optimizing results using experimental design techniques. The optimal conditions for extraction and stripping were determined, with high correlation coefficients indicating the validity of the models for predicting lanthanum permeability coefficients.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Engineering, Chemical
Atsushi Matsuoka, Akihito Otani, Eiji Kamio, Hideto Matsuyama
Summary: Amino acid ionic liquids are used as a CO2 carrier in facilitated transport membranes due to their high CO2 permselectivity, but estimating membrane performance is challenging because of viscosity changes. Investigating potential models to accurately estimate the CO2 permeability of these membranes through simulations can enhance prediction accuracy.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Nilay Baylan, Feride Naime Turk, Suheyla Cehreli
Summary: In this investigation, cyclopentyl methyl ether (CMPE) was explored as a new membrane solvent for the removal of acetic acid from an aqueous medium using facilitated bulk liquid membrane (BLM). Tributyl phosphate (TBP) was used as a carrier in CMPE to enhance the transport of acetic acid. The effects of various operating factors such as carrier concentration, receiving phase type, and receiving phase concentration on the removal were analyzed. The uptake was evaluated through extraction and receiving yields. A mass transfer modeling was established, and the mass transfer coefficients were determined. The highest yields were achieved with 95.4% extraction and 78.01% receiving yields at a carrier concentration of 2 mol/L in the membrane solvent and a receiving phase concentration of 4 mol/L NaOH.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Wei He, Kaixuan Chen, Liucun Zhu, Kang Shen
Summary: The energy surfaces and reaction kinetics of 2-acetylfuran(AF2) and its reactions with OH were studied by theoretical calculations. The results showed that the H-abstraction reaction on CH3 and OH-addition reactions at the C(2) and C(5) sites on the furan ring were the main reaction channels. This study provides theoretical guidance for the combustion mechanism and practical application of AF2.
Article
Chemistry, Physical
Mohammad Amin Alaei Shahmirzadi, Ali Kargari, Takeshi Matsuura
Summary: This study employs computational molecular methods to investigate the interactions between gas species and ionogel membranes. By calculating parameters such as solvation free energy and radial distribution functions, the key factors contributing to the high solubility of propylene in IL electrolyte are revealed. The findings are expected to provide guidance for designing new membranes for olefin/paraffin separation.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Engineering, Environmental
Yihua Chen, Hang Ma, Jiaxin Zhu, Yurong Gu, Tongzhou Liu
Summary: This study reveals a parallel mechanism in addition to the LMCT mechanism for UV/Fe3+-synergized PFOA defluorination, depending on UV254 photon flux and Fe3+ dosage. Remarkable electron density perturbation in [PFOA-Fe]2+ is crucial for excessive defluorination.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Chemical
Ricardo D. Fernandes, Jerry H. Meldon
Summary: This analysis evaluates the feasibility of separating hydrogen sulfide from carbon dioxide using a thin alkaline liquid film. Simulations predict high fluxes and high CO2/H2S permselectivities in very thin films.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Electrochemistry
Eduardo Laborda, Juan Garcia-Martinez, Angela Molina
Summary: The theoretical investigation on the value of spectroelectrochemistry for elucidating electrode reactions with complex stoichiometries is presented. The analytical equations allow for modeling absorbance response in various modes and potential-controlled techniques, with a demonstration on how SPEC can assist in determining stoichiometric coefficients of redox species concurrently and unequivocally.
ELECTROCHEMISTRY COMMUNICATIONS
(2021)
Article
Electrochemistry
Encarnacion Torralba, Eduardo Laborda, Angela Molina, Christine Cachet-Vivier, Stephane Bastide
Summary: Cavity microelectrodes (CMEs) provide a valuable platform for evaluating the electrocatalytic performance of micro- and nanoparticulate materials; experiments show capacitive distortion increases with powder surface area, but faradaic response mainly occurs on the first layer of the powder load, cyclic voltammetry and square wave voltammetry (SWV) are suitable for discriminating faradaic processes at CMEs.
Review
Chemistry, Physical
Eduardo Laborda, Angela Molina
Summary: In the field of single-entity electrochemistry, the use of soft interfaces has been proven to be a valuable complement to solid microelectrodes for both hard and soft micro- and nanoparticles. This approach also offers a new platform for studying electronic and ionic transfers across liquid-liquid interfaces, with applications in biological, technological, and industrial systems. Experimental results with Interfaces between Two Immiscible Electrolyte Solutions (ITIES) are reviewed and discussed in relation to theoretical treatments.
CURRENT OPINION IN ELECTROCHEMISTRY
(2021)
Article
Chemistry, Analytical
J. Gonzalez, E. Laborda, A. Molina
Summary: Analytical theoretical solutions are presented for electron-coupled ion transfers in cyclic voltammetry with thick film-modified electrodes, covering a wide range of situations including immobilized or freely diffusing redox transducers, and simple or complicated ion transfers by homogeneous chemical processes. A comprehensive study of each case defines key parameters and guidelines for analyzing the electrochemical signal of the system.
Article
Chemistry, Physical
E. Laborda, J. Gonzalez, A. Molina
Summary: A wide range of cases of homogeneous two-electron molecular catalysts in electrochemical reactions were investigated using a novel and rigorous analytical theory in voltammetry. Simple expressions were deduced for the current-potential response at static and rotating macroelectrodes in all possible situations, involving catalytically active pathway(s), rate constant(s), and formal potentials of the electron transfers. Criteria and procedures were proposed to identify the true catalytic states and pathways. The results revealed fundamental differences between voltammetry of multi-electron catalysts and mono-electron ones (EC' mechanism), particularly in terms of the impact of mass transport on signal features and accessibility to pure kinetic conditions.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Analytical
Jose Antonio Gonzalez-Franco, Alberto Ruiz, Joaquin Angel Ortuno
Summary: This study investigated the transient potential signals obtained with a cation-selective electrode and found different types of signals for different ions. Principal component analysis (PCA) allowed for qualitative identification of ions and detection of interfering ions. The study also demonstrated the use of calibration graphs for quantitative determination of ions.
Article
Chemistry, Analytical
Luis Romay, Joaquin Gonzalez, Angela Molina, Eduardo Laborda
Summary: UV-vis spectroelectrochemistry is evaluated as a tool for diagnosing and quantitatively investigating the occurrence of comproportionation in multielectron transfer processes. The theoretical study shows that the chronoabsorptometric signals related to different redox states have sensitivity to the comproportionation kinetics. Experimental results demonstrate the occurrence of comproportionation in different media with varying kinetics depending on the cationic species in solution.
ANALYTICAL CHEMISTRY
(2022)
Article
Electrochemistry
A. Molina, J. Gonzalez, E. Laborda
Summary: Accurate and rational benchmarking of molecular catalysts is crucial for achieving high selectivity and efficiency in electrochemical reactions. However, the analysis of complex multi-electron, multi-step processes in homogeneous catalytic schemes is mainly based on methods developed for the simple one-electron catalytic mechanism. This study investigates the applicability of these protocols for multi-electron catalysts and proposes novel tools to overcome inaccuracies caused by the widely-used pure kinetic conditions.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Joaquin Gonzalez, Esteban Guillen, Eduardo Laborda, Angela Molina
Summary: A theoretical model is proposed for the quantitative analysis of voltammetric response of multi-redox catalysts. Using a gold electrode and the electro-reduction of chloride anion as a model system, the formal potentials and rate constants of the overall reaction process are accurately determined. The logarithm of the rate constants for the catalytic steps shows a linear relationship with the average formal potentials of the charge transfer processes. This study provides a rigorous solution with clear advantages compared to previous efforts in characterizing electrocatalytic responses.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Analytical
Manuela Lopez-Tenes, Eduardo Laborda, Francisco Martinez-Ortiz, Joaquin Gonzalez, Angela Molina
Summary: A comprehensive theoretical investigation of square wave voltammetry (SWV) for homogeneous two-electron molecular catalysis of electrochemical reactions is conducted. The study explores various factors affecting the SWV signal, such as pulse time, SW amplitude, catalytic rate constants, substrate concentration, and formal potentials. The research highlights the importance of SW components in identifying the active form of the catalyst and establishes rigorous and easily implementable mathematical expressions to analyze quantitative data, considering the influence of diffusion.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Maria Cuartero, Alberto Ruiz, Manuel Galian, Joaquin A. Ortuno
Summary: This paper presents the development and use of a new potentiometric electronic tongue for qualitative and quantitative analysis of natural mineral waters. The electronic tongue measures the conductivity and ion content of the water sample. The system uses six ion-selective electrodes with membranes formulated to respond to cationic or anionic ions. The absence of any ionophore in the membrane allows for a general response profile, making the electronic tongue effective. The tongue shows acceptable repeatability and reproducibility and can differentiate and classify water samples based on their conductivity. Additionally, it is possible to quantitatively determine the six main ions in the water samples using a simple linear calibration model.
Article
Electrochemistry
Lamia Rebiai, Diane Muller-Bouvet, Raihana Benyahia, Encarnacion Torralba, Melissa Lopez Viveros, Vincent Rocher, Sam Azimi, Christine Cachet-Vivier, Stephane Bastide
Summary: To reduce energy costs and environmental impact in wastewater treatment plants, treating urea at the source is advantageous. Researchers have developed FTO/Ti-Fe2O3 (nanorods) photoelectrodes decorated with Ni catalyst for urea photoelectrocatalytic oxidation under solar illumination. The catalytic activity is improved by using a Ni photoelectrodeposition method. The study demonstrated the photoelectrocatalytic removal of nitrogen from urea solutions, but higher selectivity catalysts are needed.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Joaquin Gonzalez, Eduardo Laborda, Angela Molina
Summary: This article presents the theoretical and practical foundations of basic electrochemical concepts of heterogeneous charge transfer reactions for undergraduate and postgraduate students to study. Various simple methods for calculating key variables and simulated examples using an Excel document are explained and discussed. The current-potential response of electron transfer processes with different kinetics and electrode types is compared, and protocols for determining kinetic parameters for nonreversible processes are proposed. The implementation of this framework, as well as the benefits and difficulties encountered, are also discussed.
JOURNAL OF CHEMICAL EDUCATION
(2023)
Editorial Material
Engineering, Chemical
Encarnacion Torralba, Stephane Bastide
Article
Chemistry, Analytical
Eduardo Laborda, Javier Lopez-Asanza, Angela Molina
Summary: Closed bipolar cells (cBPCs) provide a valuable platform for electrochemical sensor development, but they are more complex to model and interpret than conventional systems. This study derives rigorous mathematical solutions for the cyclic voltammetry (CV) of cBPCs, allowing for a comprehensive understanding of their behavior and the establishment of diagnostic criteria based on the CV signal characteristics.
ANALYTICAL CHEMISTRY
(2023)
