Article
Environmental Sciences
Yangyang Liu, Tao Wang, Qiuyue Ge, Zhuocheng Shi, Kejian Li, Kedong Gong, Lifang Xie, Wei Wang, Qianlong Wang, Jin Han, Hongbo Fu, Jianmin Chen, Liwu Zhang
Summary: Flow velocity is found to play a crucial role in the heterogeneous oxidation of SO2 on alpha-Fe2O3 particles, with increased velocity significantly enhancing the oxidation capability. Specimen analysis suggests a shift in the oxidation mechanism from a heterogeneous reaction mediated by active sites under low flow velocity to an aqueous-like multiphase-dominated pathway under high flow velocity. This study highlights the importance of flow velocity in triggering fast sulfate production in dust chemistry.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Engineering, Environmental
Can Li, Vishnu Sriram, Joo-Youp Lee
Summary: In this study, the impact of HCl and NH3 on Hg(0) oxidation catalytic reaction was investigated through real-time Hg(0) oxidation experiment and X-ray Absorption Near-Edge Structure analysis. The research revealed that Hg(0) oxidation is influenced by the combined action of HCl and O-2. HgCl2 was identified as the major mercury species formed on the spent catalyst under typical flue gas conditions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Yongpeng Ma, Tengfei Xu, Ling Li, Jiandong Wang, Yu Li, Hongzhong Zhang
Summary: The study found that α-Fe2O3/SnO2 binary oxides have high efficiency in removing gaseous elemental mercury, especially at high temperatures, with involvement of O-2. SO2 and H2O vapor can reduce the removal efficiency, while the presence of HCl greatly enhances it. The mechanisms of removal involve catalytic oxidation and adsorption processes, with involvement of Fe3+, O2-, Sn4+, and Sn2+.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Seth N. Lyman, Tyler Elgiar, Mae Sexauer Gustin, Sarrah M. Dunham-Cheatham, Liji M. David, Lei Zhang
Summary: The understanding of atmospheric mercury chemistry, especially under conditions of anthropogenic photochemical pollution, is still uncertain. Previous studies have shown rapid increases in oxidized mercury under polluted conditions, but it has not been clearly demonstrated that this is the result of local mercury oxidation. Our research suggests that rapid gas-phase mercury oxidation by ozone and OH in photochemical smog is unlikely.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Hailong Li, Faqin Dong, Liang Bian, Tingting Huo, Lin Zhou, Weige Luo, Jiao Zhang, Fei Zheng, Zhenzhen Lv, Xiaochun He, Bowen Li
Summary: In this study, the adsorption characteristics and reaction mechanisms of SO2 and HONO on the α-Fe2O3 surface were investigated using density functional theory. The results showed that SO2 adsorbs as a molecule, while HONO dissociates on the surface. The presence of oxygen defects enhanced the adsorption intensity of both molecules and accelerated the decomposition of HONO, leading to the oxidation of SO2 by HONO.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Authit Phakkhawan, Pitphichaya Suksangrat, Pornjuk Srepusharawoot, Sukhum Ruangchai, Pawinee Klangtakai, Samuk Pimanpang, Vittaya Amornkitbamrung
Summary: A solvothermal technique was used to synthesize nine different morphologies of ferric oxide. Among them, the flower-shaped ferric oxide exhibited the highest specific capacitance, pore volume, and specific surface area. The flower-shaped ferric oxide film maintained a relatively high performance after 1000 cycles. Supercapacitor coin cells constructed from the flower-shaped ferric oxide anode and MnO2 cathode showed excellent energy density and power density.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Qiankun Xu, Qingliang Shan, Jianbao Hu, Anze Shui
Summary: In this paper, a new kinetic model considering both oxidation and volatilization kinetics is established and successfully applied to analyze the oxidation process of SiC-B4C-xAl(2)O(3) ceramics and other systems. The model takes into account the effects of diffusion area and volume changes during the oxidation process, and the physical meaning of each parameter is well-defined. The practicality of the model is verified by experimental data, showing its applicability to systems with both oxidation and volatilization, as well as systems where only oxidation is involved.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Juan Carlos Gomez Martin, Thomas R. Lewis, Kevin M. Douglas, Mark A. Blitz, Alfonso Saiz-Lopez, John M. C. Plane
Summary: The rate constants of many reactions in atmospheric chemistry of mercury are still unknown. This study conducted the first experimental determination of the rate constant of the gas-phase reaction between the HgBr radical and ozone, as well as the rate constants of two reduction side reactions. The results support the notion that the main atmospheric fate of HgBr is reaction with ozone to form BrHgO.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Engineering, Environmental
Sara G. S. Santos, Larissa O. Paulista, Belisa A. Marinho, Claudio Passalia, Marina Flores, Marisol D. Labas, Rodolfo J. Brandi, Vitor J. P. Vilar
Summary: This study focused on the kinetic modeling of As(III) oxidation using heterogeneous TiO2 photocatalysis and UV LED assistance in two different reactor configurations. The front-side illumination configuration exhibited higher reaction rates and As(V) adsorptivity, while the dependency of the reaction rate on the incident radiation level was consistent across both configurations.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Fuxiang Ge, Xuehua Li, Mian Wu, Hui Ding, Xiaobing Li
Summary: This study synthesized α-Fe2O3/g-C3N4 composite as a heterogeneous photo-Fenton catalyst using a hydrothermal-calcination method and investigated the influence of annealing temperature. The results showed that the annealed α-Fe2O3/g-C3N4 sample exhibited the highest degradation efficiency due to the improved charge transfer ability caused by the tight heterojunction structure.
Article
Environmental Sciences
Ophelia Gestin, Thomas Lacoue-Labarthe, Marina Coquery, Nicolas Delorme, Laura Garnero, Lysiane Dherret, Theo Ciccia, Olivier Geffard, Christelle Lopes
Summary: The study found that G. fossarum efficiently takes up Cd and eliminates it more rapidly compared to the mussel M. galloprovincialis. The organs that accumulate and depurate the most concentrations of both metals are the caeca and intestine. The one-compartment TK model is most relevant for Hg, while the multi-compartments TK model fits Cd data better, demonstrating dynamic transfer of Cd among organs.
ENVIRONMENT INTERNATIONAL
(2021)
Article
Chemistry, Physical
Heonho Lee, Uday Kurien, Parisa A. Ariya
Summary: Mineral dust aerosols are important for tropospheric chemistry and aerosol-cloud interactions. This study investigated the interactions between gaseous elemental mercury (Hg-(g)(0)) and mineral dust aerosols. The results showed that under UV-A irradiation, TiO2 had a higher uptake coefficient for Hg-(g)(0) than Al2O3, and under visible light irradiation, only TiO2 exhibited uptake. Increasing relative humidity inhibited the uptake on both TiO2 and Al2O3. Moreover, water vapor induced the desorption of mercury from exposed surfaces. This study suggests that heterogeneous interactions with mineral dust may be significant under specific conditions.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Environmental Sciences
Chunyan Hu, Jinke He, Jianjun Liang, Tao Lin, Qiuliang Liu
Summary: A novel photo-Fenton catalyst FGN with dual Z-scheme heterojunction was successfully prepared and it showed excellent degradation performance towards tetracycline. The optimized preparation conditions and characterization analyses confirmed the successful synthesis of FGN. The experimental results demonstrated that FGN had better light absorption ability, higher separation efficiency of photoelectrons and holes, larger specific surface area, and higher pore capacity compared to other catalysts. The effects of experimental conditions on the degradation performance were investigated and three degradation pathways of tetracycline were proposed. The structural stability and catalytic active sites of FGN were explored by comparing the XRD and XPS spectra. Additionally, the mechanism of the dual Z-scheme heterojunction was proved through various experimental methods.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Chemical
Joao Lourenco Castagnari Willimann Pimenta, Mariana de Oliveira Camargo, Rafael Belo Duarte, Onelia Aparecida Andreo dos Santos, Luiz Mario de Matos Jorge
Summary: An improved kinetic model for the deoxygenation of fatty acids was developed in this study, which successfully predicted the behavior of reactants, intermediates and products in various cases. Through data comparison and application of information criterions, it was concluded that the new model was the best fit for behavior prediction. Additionally, relevant data regarding reaction rates and selectivity for the new catalyst were provided.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
You Li, Zhou Wang, Ruijiang Liu
Summary: A novel type of magnetic alpha-Fe2O3/Fe3O4 heterogeneous nanoparticles were prepared using a simple solution combustion method and characterized using various techniques. The study investigated the effects of different parameters on the composition of the nanoparticles. Results showed that the nanoparticles exhibited good biocompatibility and potential for various applications.
Correction
Chemistry, Applied
Jia Liu, Juntong Dong, Xiaodan Li, Teng Xu, Zhenguo Li, Jeffrey Dankwa Ampah, Mubasher Ikram, Shihai Zhang, Chao Jin, Zhenlong Geng, Tianyun Sun, Haifeng Liu
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Seba Alareeqi, Daniel Bahamon, Kyriaki Polychronopoulou, Lourdes F. Vega
Summary: This study explores the potential application of single-atom-alloy (SAA) catalysts in bio-oils hydrodeoxygenation refining using density functional theory (DFT) and microkinetic modeling. It establishes the relationships between stability, adsorptive properties, and activity structures for bio-oil derivatives, providing guidance for the synthesis of cost-effective SAA combinations.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Bin Hu, Wen -Ming Zhang, Xue-Wen Guo, Ji Liu, Xiao Yang, Qiang Lu
Summary: This study explored the pyrolysis behaviors and mechanisms of different monosaccharides, including arabinose, galactose, galacturonic acid, and glucuronic acid. The roles of structural differences in these monosaccharides were analyzed, and it was found that glucuronic acid undergoes a special C-C bond breaking reaction during pyrolysis. The findings provide a deep understanding of the pyrolysis chemistry of hemicellulose and the role of different branches.
FUEL PROCESSING TECHNOLOGY
(2024)
Review
Chemistry, Applied
Youwei Zhi, Donghai Xu, Guanyu Jiang, Wanpeng Yang, Zhilin Chen, Peigao Duan, Jie Zhang
Summary: Hydrothermal carbonization (HTC) is an effective method for the harmless disposal of municipal sludge (MS) and offers potential applications for the obtained products. Optimizing reaction conditions, coupling with other waste materials, and combining different processes can improve the performance of HTC. Furthermore, HTC contributes to energy recovery and enhances the quality of life cycle assessment.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Jia Wang, Jianchun Jiang, Dongxian Li, Xianzhi Meng, Arthur J. Ragauskas
Summary: This study presents a scalable process for converting holocellulose and cellulosic wastes into advanced oxygen-containing biofuels with high furan, cyclic ketone, and ethanol content. By combining hydropyrolysis and vapor-phase hydrodeoxygenation using Pd/Al2O3 as a catalyst, the researchers achieved high yields and conversions. The integrated process holds great promise for biomass waste conversion into advanced biofuels.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Florian Held, Jannis Reusch, Steffen Salenbauch, Christian Hasse
Summary: The accurate prediction and assessment of soot emissions in internal combustion engines are crucial for the development of sustainable powertrains. This study presents a detailed quadrature-based method of moments (QMOM) soot model coupled with a state-of-the-art flow solver for the simulation of gasoline engines. The model accurately describes the entire cause-and-effect chain of soot formation, growth and oxidation. Experimental validation and engine cycle simulations are used to identify the root cause of observed soot formation hotspots.
FUEL PROCESSING TECHNOLOGY
(2024)
