Review
Chemistry, Multidisciplinary
Chao Huang, Paul K. Chu
Summary: Electrochemical water splitting to generate H-2 and O-2 is a sustainable strategy for a greener society. The use of 3D porous electrodes with Fe, Co, Ni, Cu, and C foam materials has gained attention for achieving higher current densities (> 500 mA cm(-2)) in industrial applications. However, oversimplification in the experimental and quantitative processes for foam electrodes has hindered a full understanding of their electrocatalytic nature and the development of suitable catalysts.
TRENDS IN CHEMISTRY
(2022)
Article
Engineering, Civil
Yu Bai, Yinfeng Xia, Nan Geng, Yiting Qi, Dongjing Huang, Yufeng Zhao, Lu Huang, Dandan Shen, Guojin Sun, Cundong Xu, Ertian Hua
Summary: This study innovatively investigates the variation law and formula of the oxygen mass transfer coefficient in vegetated channels through experiments and theoretical analysis. The results show that vegetation significantly increases the mass transfer of dissolved oxygen, and the oxygen transfer coefficient increases with higher vegetation density. This study provides a theoretical basis for the selection and layout of aeration systems in vegetated channels.
JOURNAL OF HYDROLOGY
(2023)
Article
Chemistry, Multidisciplinary
Zhaoyu Yao, Yuliang Yuan, Tao Cheng, Lei Gao, Tulai Sun, Yangfan Lu, Yi-Ge Zhou, Pedro L. Galindo, Zhilong Yang, Liang Xu, Hao Yang, Hongwen Huang
Summary: A study discovered an anomalous size effect of Pt nanowires, where the activity and durability of oxygen reduction reaction increased as the diameter decreased from 2.4 to 1.1 nm. This was attributed to increased compressive strain weakening adsorption and suppressing Pt dissolution, as well as the reduced low-coordinated sites and intrinsic structural advantage on the nanowires.
Article
Thermodynamics
Il Woong Park, In Yeop Kang, Jia Yu, Yeon-Gun Lee
Summary: This study experimentally measured the bubble lift-off diameter on a flat heated surface under sub-cooled flow boiling conditions, and proposed a modified model that can predict the average size of bubbles.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
Xian He, Peng Du, Guangqiang Yu, Ruyue Wang, Yuanzheng Long, Bohan Deng, Cheng Yang, Wei Zhao, Zhuting Zhang, Kai Huang, Ming Lei, Xibo Li, Hui Wu
Summary: In this study, a high-performance catalytic electrode was successfully prepared by in situ growing a metal-amorphous oxide heterostructure catalyst on nickel foam using liquid Joule-heating. The electrode exhibited excellent catalytic performance and stability in alkaline electrolytes, achieving efficient hydrogen evolution at high current densities.
Article
Chemistry, Physical
Ruben Rizo, Enrique Herrero, Victor Climent, Juan M. Feliu
Summary: The dependence of voltammetric currents on multiple parameters in interfacial studies of noble metal electrodes provides important information for understanding surface structure and reactivity. However, the complexity of the redox processes involved is often neglected. Anion competitive adsorption plays a crucial role in the hydrogen adsorption region on platinum, which is usually overlooked. Recent studies have confirmed the presence of OH adsorbed on step sites at lower potentials than commonly considered, highlighting the importance of this information in analyzing complex catalysts and performing coulometric analysis.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
Jingshan Qin, Tianhui Xie, Daojin Zhou, Liang Luo, Zhengyi Zhang, Zhicheng Shang, Jiawei Li, Lagnamayee Mohapatra, Jinwen Yu, Haijun Xu, Xiaoming Sun
Summary: This study investigates the evolution kinetics of electro-generated hydrogen bubbles on three different Pt electrodes with varied geometries, revealing a time-dependent growth kinetic of bubble radius closely related to the electrode geometry. Among the three electrodes, the nanoarray one exhibits the fastest bubble growth kinetics and the largest growth coefficient.
Article
Green & Sustainable Science & Technology
Shuai Sun, Jingyun Dang, Kaifeng Ji, Zijian Shi, Mingyu Chen, Cui Zhang, Shuangxi Liu
Summary: In this study, a series of ordered mesoporous carbon (OMC) electrodes with switchable surface wettability were developed. These electrodes are favorable for water electrolysis at high current densities and increase the production of H2O2 in the oxygen reduction reaction. The hydrophilic OMC electrodes can promote the oxygen evolution reaction performance by separating O2 bubbles promptly, while the hydrophobic OMC electrodes provide a directional diffusion channel for O2 transport to improve the efficiency of O2 utilization. These electrodes are expected to play an important role in electrocatalytic reactions involving gases.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Martins Vanags, Guntis Kulikovskis, Juris Kostjukovs, Laimonis Jekabsons, Anatolijs Sarakovskis, Krisjanis Smits, Liga Bikse, Andris Sutka
Summary: Energy storage and delivery are crucial for managing renewable power sources, and hydrogen energy is proposed as a major substitute for this purpose. However, membrane separation in single-cell water electrolysis poses a challenge. Decoupled water electrolysis has been proposed as a solution, with hydrogen and oxygen generated in separate alkaline cells. The proposed amphoteric decoupled electrolysis method using an auxiliary electrode shows higher electrolysis efficiency compared to traditional alkaline-based decoupled electrolysis.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Environmental Sciences
H. Arslan, M. Gun, C. Akarsu, Z. Bilici, N. Dizge
Summary: In this study, turnip juice wastewater treatment was investigated using electrocoagulation/electroflotation and electrooxidation processes. The optimal conditions for both processes were determined, and high removal efficiencies were achieved. Laboratory scale tests showed that both electrocoagulation/electroflotation and electrooxidation processes are applicable for turnip juice wastewater treatment.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Mariana C. O. Monteiro, Akansha Goyal, Pricilla Moerland, Marc T. M. Koper
Summary: This study investigates how the cation identity and concentration affect the kinetics of the hydrogen evolution reaction on platinum and gold electrodes. Weakly hydrated cations favor HER on gold at low overpotentials, while strongly hydrated cations exhibit higher activity in more alkaline pH conditions. The inhibition of HER by weakly hydrated cations is observed on platinum even at lower alkalinity and concentrations, suggesting a stronger interaction between platinum and metal cations.
Article
Chemistry, Physical
Wei Zhang, Junfeng Wang, Yujie Huang, Bin Li, Kai Yu, Dongbao Wang, Haojie Xu
Summary: Through studying the efficient blending performance of hydrogen bubbles in biodiesel, it is found that the special electric field configuration and bubble behavior characteristics have significant implications for improving the mixing effect.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Selwyn Hanselman, Federico Calle-Vallejo, Marc T. M. Koper
Summary: Surface platinum hydride structures on Pt(111) play a potentially important role in electrocatalysis and cathodic corrosion. Using thermodynamic methods and density functional theory, multiple surface hydride structures on Pt(111) were compared. These structures contain multiple monolayers of hydrogen that can bind subsurface or reconstruct the surface. Stable configurations share one monolayer of subsurface H stacking between the top two Pt layers. Our work provides insight into the operando surface state during low-potential reduction reactions on Pt(111) and shows a plausible precursor for cathodic corrosion.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Analytical
Irkham, Kazuho Kazama, Yasuaki Einaga
Summary: This study presents the detection of molecular hydrogen in water using platinum modified boron doped diamond (Pt-BDD). A clear peak of hydrogen desorption was observed around -0.1 V in 0.1 M KCl solution. The signal at Pt-BDD electrode was found to be higher and more stable compared to bare Pt electrode. The performance of the sensor was compared with gas chromatography method, showing similar trends. This suggests that Pt-BDD could be a good electrode candidate for detecting dissolved H2 in water-based solutions.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Megan K. Puglia, Patrick K. Bowen
Summary: This study compared the performance of platinum, palladium, and gold-based electrodes using cyclic voltammetry and calculated their charge storage capacities. The results showed that palladium-based alloys exhibited the highest reversibility in aerated conditions. The findings of this study provide valuable insights for the engineering design of future implantable electrode materials.
Article
Engineering, Chemical
Carlos A. Castaneda Olivera, Antonio Gutierrez Merma, Jhonatan G. Soto Puelles, Mauricio Leonardo Torem
MINERALS ENGINEERING
(2017)
Article
Engineering, Chemical
Ronald Rojas Hacha, Mauricio LeonardoTorem, Antonio Gutierrez Merma, Vanessa Figueiredo da Silva Coelho
MINERALS ENGINEERING
(2018)
Article
Engineering, Chemical
Thiago da Silva Ribeiro, Caroline Dias Grossi, Antonio Gutierrez Merma, Brunno Ferreira dos Santos, Mauricio Leonardo Torem
MINERALS ENGINEERING
(2019)
Article
Materials Science, Multidisciplinary
Antonio Gutierrez Merma, Carlos Alberto Castaneda Olivera, Ronald Rojas Hacha, Mauricio Leonardo Torem, Brunno Ferreira dos Santos
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2019)
Article
Chemistry, Multidisciplinary
Andreza Rafaela Morais Pereira, Ronald Rojas Hacha, Mauricio Leonardo Torem, Antonio Gutierrez Merma, Flavia P. C. Silvas, A. Abhilash
Summary: The study confirmed the biosurfactant adsorption onto the hematite surface, reducing the surface tension of the water/gas interface with a low critical micelle concentration. In flotation experiments, the iron grade and recovery increased with the flotation stage, showing a positive impact of biosurfactant on hematite flotation.
SEPARATION SCIENCE AND TECHNOLOGY
(2021)
Article
Geochemistry & Geophysics
Carolina R. Simoes, Ronald R. Hacha, Antonio G. Merma, Mauricio L. Torem
Article
Chemistry, Multidisciplinary
Marcelo Carneiro Camarate, Antonio Gutierrez Merma, Ronald Rojas Hacha, Mauricio Leonardo Torem
Summary: Recent studies have shown that bioflocculation using biosurfactant extracted from Candida stellata yeast can effectively flocculate ultrafine hematite particles, achieving a recovery rate of approximately 90% at pH 3.0. Analysis through FTIR and zeta potential studies revealed the adsorption of biosurfactant onto the surface of hematite, altering its surface properties.
SEPARATION SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Ayrton Alef Castanheira Pereira, Carlos Alberto Castaneda Olivera, Antonio Gutierrez Merma, Ronald Rojas Hacha, Brunno Ferreira dos Santos, Mauricio Leonardo Torem
Summary: This study investigated the use of polynomial modeling and artificial neural network techniques for optimizing bioflotation parameters in the separation of carbonate gangue minerals from phosphate ores. Results showed that artificial neural network models had higher adequacy in describing and predicting mineral recovery compared to polynomial models. A more acidic medium and higher biosurfactant concentration were found to increase mineral recovery.
MINERALS ENGINEERING
(2021)
Article
Engineering, Chemical
Luana C. S. Nascimento, Mauricio L. Torem, Ellen C. Giese, Antonio G. Merma, Luiz C. Bertolino, Nathalia O. A. Anjos
Summary: Run-of-mine (ROM) palygorskite from Guadalupes in Piaui, Brazil, was found to have a maximum sorption capacity of 18 mg/g for Nd3+ ions. More than 99% of Nd was removed from the solution at pH 5. The Temkin model provided the best fit for the sorption data, indicating an electrostatic interaction between PAL and Nd3+ ions.
MINERALS ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Antonio G. Merma, Brunno F. Santos, Artur S. C. Rego, Ronald R. Hacha, Mauricio L. Torem
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2020)
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.
