Article
Chemistry, Physical
Jofre Manosa, Jaume Calvo-de la Rosa, Alessio Silvello, Alex Maldonado-Alameda, Josep Maria Chimenos
Summary: This study presents novel characterisation techniques to evaluate the effects of mechanical activation (MA) on the kaolinite structure. The results show that mechanical treatments significantly distort the kaolinite structure, reducing the kaolinite content and altering the morphology of kaolinite particles. Illite, K-feldspars, and quartz impurities are also extensively modified. The mechanical treatments also affect the bonding strength of hydroxyls in the structure and can lead to the formation of water molecules.
APPLIED CLAY SCIENCE
(2023)
Article
Chemistry, Physical
J. Manosa, A. M. Gomez-Carrera, A. Svobodova-Sedlackova, A. Maldonado-Alameda, A. Fernandez-Jimenez, J. M. Chimenos
Summary: This study aims to enhance the reactivity of kaolin through mechanical activation and assess its potential reactivity. The results showed that mechanical activation could produce a highly amorphous and reactive material, which was confirmed by chemical attacks and the availability of SiO2 and Al2O3.
APPLIED CLAY SCIENCE
(2022)
Article
Chemistry, Physical
Giovanni Dal Poggetto, Marco Fortunato, Anna Maria Cardinale, Cristina Leonelli
Summary: We investigated the effect of adding corundum powder, a waste product from industrial blasting processes, to a metakaolin-based alkali activated binder. The study found that the addition of recycled corundum did not affect the overall aluminosilicate structure of the geopolymeric mixes. The waste material showed good reactivity and improved the compressive strength of the consolidated mortars, making metakaolin alkali-activated binders a valuable source for construction materials.
APPLIED CLAY SCIENCE
(2023)
Article
Chemistry, Physical
Karol Kulacz, Bartlomie M. Szyja, Kazimierz Orzechowski, Aneta Jezierska
Summary: High-temperature treatment of smectite minerals results in the loss of sorption ability, which is not fully understood. This study utilized quantum-chemical methods to analyze the structural changes associated with smectite dehydroxylation. The results revealed the multi-path reaction mechanism and the involvement of both proton transfer and water molecule formation in the dehydroxylation process.
APPLIED CLAY SCIENCE
(2023)
Article
Polymer Science
Dennis Tran, Courtney Spain Sowah, Kyu Yong Choi
Summary: This research investigates the effects of intraparticle catalyst site distribution on the fragmentation of catalyst particles in gas-phase ethylene polymerization. The experimental results show that the impregnation time and catalyst solution concentration strongly influence the distribution of Zr in silica particles and the formation of fines during the polymerization process.
Article
Environmental Sciences
Ke-wei Li, Hai-long Lu, Jackson Nkoh Nkoh, Ren-kou Xu
Summary: The purpose of this study is to investigate the role of hydroxyl groups on the surface of montmorillonite in acidification-induced activation of solid aluminum. The results showed that the removal of surface hydroxyl groups inhibits the activation of aluminum during montmorillonite acidification.
JOURNAL OF SOILS AND SEDIMENTS
(2023)
Article
Geochemistry & Geophysics
C. Caurant, B. Debret, B. Menez, C. Nicollet, P. Bouilhol
Summary: Variations of redox conditions during slab dehydration in subduction zones have been investigated in the Monviso meta-ophiolite. The study reveals that fO2 variations are influenced by the position of the lithologies in the slab, with deep-seated lithologies showing high fO2 conditions and paleoseafloor lithologies exhibiting low fO2 conditions.
Article
Thermodynamics
Adamu Esubalew Kassa, Nurelegne Tefera Shibeshi, Belachew ZegaleTizazu
Summary: The present study aimed to analyze the kinetics of the dehydroxylation reaction of Ethiopian kaolinite during calcination, and investigated the effects of temperature, time, and particle size on the degree of conversion. Various analytical techniques were used to characterize the samples, and the results were well-fitted with pseudo-first-order reaction rate kinetics.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Review
Chemistry, Physical
Arkadiusz Derkowski, Artur Kuligiewicz
Summary: Smectites are unique among all common soil- and rock-forming minerals due to their large adsorbed-water contents and the presence of OH groups. The thermal reactions of smectites include dehydration, dehydroxylation, amorphization, recrystallization, rehydration, and rehydroxylation. Factors such as temperature, cation types, vacancies, and bond strength affect these reactions. This review discusses the details of thermal reactions, methods of analysis, structural alterations, and reaction kinetics of smectites.
CLAYS AND CLAY MINERALS
(2023)
Article
Chemistry, Physical
X. Y. Chen, B. Liu, S. B. Zhang, X. Ding, R. R. Chen
Summary: Ti19Hf4V40Mn35Cr2 alloy with improved hydrogen storage capacity was prepared through low-temperature heat treatment. The microstructure, hydrogen storage properties, and absorption/desorption mechanism were investigated. The results showed that heat treatment resulted in the formation of a large amount of equiaxed dendrite BCC phase and eutectic structure, leading to higher hydrogen storage capacity and lower activation energy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Geochemistry & Geophysics
K. Ezenwaka, B. Marcaillou, M. Laigle, F. Klingelhoefer, J. -F. Lebrun, M. Paulatto, Y. Biari, F. Rolandone, F. Lucazeau, A. Heuret, T. Pichot, H. Bouquerel
Summary: The fluid circulation and elevated pore pressure play a crucial role in controlling the seismogenic behavior along the plate interface in the Lesser Antilles subduction zone. Heat-flow variations indicate different fluid circulation patterns, which are closely related to the location of seismic activity.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Green & Sustainable Science & Technology
Yu Shen, Xin Mao, Fang Liu, Wenjie Yin, Wenxin Shi, Bing Zhang
Summary: The study compared the effects of heat/Fe2+/persulfate (PS) and heat/powdered activated carbon (PAC)/PS systems on membrane fouling mitigation. It was found that heat/Fe2+/PS showed better control of membrane fouling by generating sulfate radicals and Fe3+. Heat/PAC/PS, on the other hand, mitigated fouling through a non-radical effect and efficiently removed COD and suspended solids.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Monica Munoz-Quinonero, Jon Azkargorta, Ignacio Iparraguirre, Rafael J. Jimenez-Rioboo, Gregory Tricot, Chongyoun Shao, Francisco Munoz, Joaquin Fernandez, Rolindes Balda
Summary: This study investigated the preparation and properties of an alumino-phosphate glass, analyzing the processing conditions, network structure, and local environment of doped ions. The spectroscopic and laser emission properties of the glass were studied, including JuddOfelt calculation, stimulated emission cross-section, lifetime, and quantum efficiency of Nd3+ ions. Site-selective laser spectroscopy and stimulated emission were utilized to determine the crystal field distribution and its influence on pump wavelength dependence of Nd3+ emissions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Environmental
Yong-Tao Li, Jiu-Jiang Zhang, Yu-Hang Li, Jing-Lin Chen, Wan-Ying Du
Summary: This study focused on the remediation of petroleum hydrocarbons in soil using ultrasonic and thermal energy to activate persulfate. The results showed that ultrasonically/thermally-activated persulfate had the highest degradation efficiency, and the degradation of petroleum hydrocarbons followed a pseudo-second-order reaction, with rate constants increasing with temperature and persulfate dosage.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Gen-ichiro Yamamoto, Atsushi Kyono, Yoshinari Sano, Yoshitaka Matsushita, Yasuhiro Yoneda
Summary: During the thermal decomposition of hydromagnesite, significant changes were observed in the crystal structure, with lattice parameters showing different trends with increasing temperature. Structural collapse and chemical reactions occurred above 280 degrees C without nucleation and growth of crystal phases up to 425 degrees C.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Song Hou, Mohammednoor Altarawneh, Eric M. Kennedy, John C. Mackie, Roland Weber, Bogdan Z. Dlugogorski
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Thermodynamics
Jomana Al-Nu'airat, Bogdan Z. Dlugogorski, Ibukun Oluwoye, Xiangpeng Gao, Mohammednoor Altarawneh
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Thermodynamics
Zhe Zeng, Bogdan Z. Dlugogorski, Ibukun Oluwoye, Mohammednoor Altarawneh
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Thermodynamics
Kamal Siddique, Mohammednoor Altarawneh, Anam Saeed, Zhe Zeng, Jeff Gore, Bogdan Z. Dlugogorski
COMBUSTION AND FLAME
(2019)
Article
Chemistry, Physical
Nassim Zeinali, Ibukun Oluwoye, Mohammednoor Altarawneh, Bogdan Z. Dlugogorski
THEORETICAL CHEMISTRY ACCOUNTS
(2019)
Article
Engineering, Chemical
Arif A. Abdullah, Hans C. Oskierski, Mohanunednoor Altarawneh, Gamini Senanayake, Gregory Lumpkin, Bogdan Dlugogorski
MINERALS ENGINEERING
(2019)
Article
Energy & Fuels
Sidra Jabeen, Xiangpeng Gao, Mohammednoor Altarawneh, Jun-ichiro Hayashi, Mingming Zhang, Bogdan Z. Dlugogorski
Article
Environmental Sciences
Oday H. Ahmed, Mohammednoor Altarawneh, Mohammad Al-Harahsheh, Zhong-Tao Jiang, Bogdan Z. Dlugogorski
Article
Energy & Fuels
Ibukun Oluwoye, Mohammednoor Altarawneh, Jeff Gore, Bogdan Z. Dlugogorski
Article
Chemistry, Inorganic & Nuclear
Thamsanqa Ncube, Hans Oskierski, Gamini Senanayake, Bogdan Z. Dlugogorski
Summary: This study investigates an alternative process route for lithium extraction from alpha-spodumene using potassium sulfate, which also produces leucite as a slow release fertilizer. The reaction sequence between alpha-spodumene and potassium sulfate is documented using synchrotron X-ray diffraction and differential scanning calorimetry, providing insights into the mechanism of the transformation process.
INORGANIC CHEMISTRY
(2021)
Article
Environmental Sciences
Mohammednoor Altarawneh, Mansour H. Almatarneh, Bogdan Z. Dlugogorski
Summary: The study focuses on the thermal transformation of perfluoropentanoic acid in gas-phase reactions, constructing a gas-phase submodel with 56 reactions and 45 species. Theoretical estimates for the operation of PFAS thermal destruction systems were provided based on the formation of small fluorocarbon compounds in a specific temperature window and residence time.
Article
Environmental Sciences
Mohammednoor Altarawneh, Bogdan Z. Dlugogorski
Summary: This study aims to elucidate the primary chemical phenomena of low-temperature combustion of brominated compounds, constructing a detailed kinetic model and providing insights into temperature-dependent profiles of reaction products and intermediates. Experimental observations demonstrate that the model satisfactorily explains the yields of compounds like dibromophenols from oxidative reactions of 2-bromophenol molecules.
Article
Energy & Fuels
Sidra Jabeen, Xiangpeng Gao, Jun-ichiro Hayashi, Mohammednoor Altarawneh, Bogdan Z. Dlugogorski
Summary: This study highlights the significant impacts of product recovery methods on the yields and properties of hydrochars produced from algal biomass through hydrothermal carbonization. Direct filtration results in higher hydrochar yield with residue biocrude, leading to considerable differences in properties compared to DCM-aided filtration. DCM-aided filtration produces hydrochars with lower volatile matter contents but higher fixed carbon and ash contents, showing greater specific reactivity due to higher concentrations of catalytic alkali and alkaline earth metals.
Article
Chemistry, Physical
Sara Mosallanejad, Ibukun Oluwoye, Mohammednoor Altarawneh, Jeff Gore, Bogdan Z. Dlugogorski
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2020)
Article
Chemistry, Physical
Jomana Al-Nu'airat, Bogdan Z. Dlugogorski, Xiangpeng Gao, Nassim Zeinali, Jakub Skut, Phillip R. Westmoreland, Ibukun Oluwoye, Mohammednoor Altarawneh
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2019)