Article
Engineering, Chemical
Tongdong Shen, Huijie Bao, Wentao Su, Yan Jiang, Shaoping Tong
Summary: Transition metal oxides and transition metal containing oxides have been extensively researched in heterogeneous catalytic ozonation for water treatment. The catalytic mechanism for typical transition metal oxide - manganese oxide (MnO2) in catalytic ozonation remains unclear. The study found that electron transfer reaction occurs in manganese containing oxides catalytic ozonation when ozone is adsorbed on protonated surface hydroxyl groups of acid sites, but not in magnesium manganese oxides (MgMnxOy). The protonation ability of hydroxyl groups on acid sites and electron transfer ability of acid sites are positively related to Mg content in MgMnxOy.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Fa Fang, Siyu Liu, Wenhuan Yuan, Xinni Xiong, Jin Wang, Jianying Qi, Yiwen Shi, Weiqing Xu, Juan Liu, Tangfu Xiao
Summary: Potassium-rich biochars synthesized from waste banana peels were used as green adsorbents for efficient removal of Tl(I) from aqueous solution. Two distinct manganese oxide biochars, H-Mn3O4@BC and S-MnxOy@BC, were fabricated using co-precipitation and solid surface deposition methods, respectively. These biochars exhibited high adsorption capacity and resistance to interference from co-existing cations and organics, providing a promising alternative for the treatment of Tl(I)-containing wastewater.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Applied
Yanan Zhang, Yanpeng Liu, Zhenhua Liu, Xiaogang Wu, Yuxiang Wen, Hangda Chen, Xia Ni, Guohan Liu, Juanjuan Huang, Shanglong Peng
Summary: The nitrogen-doped MnO2@N cathode prepared through defect engineering greatly improves the cycle stability of manganese-based aqueous zinc-ion batteries by enhancing conductivity and electrochemical stability, leading to a high capacity retention rate. In addition, nitrogen doping promotes the diffusion of H+ and Zn(2+), resulting in enhanced battery performance.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Engineering, Environmental
Qinzhiy Li, Dieter Schild, Mathieu Pasturel, Johannes Luetzenkirchen, Khalil Hanna
Summary: This study demonstrated the sensitivity of the reactivity of layered manganese oxide to dynamic anoxic/oxic conditions. Under oxic conditions, the surface-catalyzed oxidation of Mn(II) increased the removal efficiency of the target contaminant OFL. However, an increase in Mn(II)/MnO2 molar ratio suppressed MnO2 reactivity, likely due to competitive binding between Mn (II) and OFL or modification in MnO2 surface charge. Monovalent cations compensation and their effect on MnO2 particle aggregation were observed under oxic conditions. The enhancement in the removal efficiency of OFL was confirmed in the dynamic two-step anoxic/oxic process, which emulates oscillating redox conditions in environmental settings.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Feifan Zhang, Gege Wang, Jing Wu, Xiaowei Chi, Yu Liu
Summary: This study constructed a high-voltage and long-cycle Zn-Mn battery based on a highly reversible organic coordination manganese complex cathode. By introducing insoluble carboxylate ligands, the high-voltage Mn3+/Mn2+ reaction was achieved, resulting in excellent cyclability and high specific energy.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Environmental Sciences
Wenjian Mao, Pan Wu, Yuqin Zhang, Kaidi Lai, Lisha Dong, Xufeng Qian, Yuntao Zhang, Jian Zhu
Summary: In this study, discarded mushroom-stick was used to prepare MnO2-modified biochar (MBC) with excellent adsorption capacity for Sb(III) removal. Characterisation methods revealed that MBC has a high specific surface area and mesoporous structure, with manganese oxides and hydroxyl groups playing a key role in the adsorption process. The adsorption of Sb(III) onto MBC was identified as chemisorption, involving monolayer and multilayer heterogeneous chemisorption processes. The study concludes that MBC is a promising adsorbent for removing Sb(III) from contaminated water.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Wen Sun, Ying Fang, Gaoming Sun, Congfu Dai, Yana Liu, Jiguang Zhang, Yunfeng Zhu, Jun Wang
Summary: A hierarchical porous structure of rutile Ru0.75Mn0.25O2-δ solid solution oxide is developed as an efficient oxygen evolution reaction (OER) electrocatalyst in both acidic and alkaline electrolyte. The catalyst shows superior reaction kinetics and durability due to the enhanced electrochemically active surface area and regulated Ru>4+ proportion with Mn incorporation, as well as sacrificial dissolution of Mn. It also exhibits a highly improved OER performance in alkaline electrolyte, making it a versatile catalyst for water splitting.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Chemistry, Physical
Suhong Zhang, Xinlei Fan, Jing Xue
Summary: In this study, a magnetic manganese oxide halloysite composite was prepared and characterized. The composite exhibited enhanced methylene blue removal through synergistic adsorption capacity and Fenton-like degradation. It can be separated and regenerated using an external magnetic field. The stable removal performance in multiple cycles was also demonstrated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jiabin Wu, Qun Li, Christopher E. Shuck, Kathleen Maleski, Husam N. Alshareef, Jun Zhou, Yury Gogotsi, Liang Huang
Summary: An asymmetric pseudocapacitor was constructed using Ti3C2Tx MXene as the negative electrode and vanadium-doped MnO2 as the positive electrode in a neutral 1M Li2SO4 electrolyte, operating within a 2.1 V voltage window and achieving a maximum energy density of 46 Wh/kg. This study demonstrates the potential of using MXene electrodes to expand the working voltage window of traditional redox-capable materials.
Article
Chemistry, Physical
Uladzislau Siamionau, Yauhen Aniskevich, Alexander Mazanik, Olga Kokits, Genady Ragoisha, Jae Hyeon Jo, Seung-Taek Myung, Eugene Streltsov
Summary: In this study, different MnO2 polymorphs were used as cathodes in zinc-ion batteries. The results showed that regardless of the polymorph, they exhibited similar electrochemical behavior and charge-discharge performance in weak acidic solutions, and underwent irreversible changes. These changes were caused by the dissolution and re-deposition of MnO2 and the formation of new manganese and zinc compounds. The newly formed MnO2 phase was amorphous and covered the surface of the initial crystalline particles, affecting the electrochemical behavior of the batteries. The electrochemical response of the MnO2 electrodes was strongly pH dependent.
JOURNAL OF POWER SOURCES
(2022)
Article
Polymer Science
Wenjiao Wang, Mingming Zheng, Jiajia Ren, Mingliang Ma, Xunqian Yin, Tingxi Li, Yong Ma
Summary: The feasibility of Fe3O4/MnO2/TiO2/PPy heterostructure to remove Mn7+ was researched in detail, with optimal pH at 2 and a maximum equilibrium adsorption capacity of 202.8 mg/g. The adsorbent also showed good cycle performance, indicating broad application prospects.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Environmental Sciences
Bin Yao, Tian Qin, Caifeng Zhao, Yaoyu Zhou
Summary: In this study, the degradation of sulfonamide (SA) by gamma irradiation was systematically investigated. It was found that SA could be efficiently removed from wastewater under specific conditions. Quenching experiments demonstrated that ·OH and eaq- were the main reactive species responsible for SA degradation. The presence of coexisting matters affected SA degradation.
ENVIRONMENTAL POLLUTION
(2023)
Article
Chemistry, Multidisciplinary
Weifeng Wang, Xiuru Bi, Tian Chai, Peiqing Zhao, Jun-Li Yang, Xu Meng
Summary: In this study, manganese oxide octahedral molecular sieve-modified zirconia nanocomposites were fabricated and their adsorption performance towards rutin was investigated. The results showed that manganese oxide modification significantly improved the textural properties of the nanocomposites. Moreover, the optimal adsorbent exhibited high adsorption rate and desorption rate, and could be reused for multiple times.
Article
Green & Sustainable Science & Technology
Bo Tang, Haopu Xu, Fengmin Song, Zhifeng Liu
Summary: Rice straw and corn straw were carbonized to prepare biochar, which was then modified with FeCl3, MnCl2, and Fe(NO3)(3) & KMnO4. The physical and chemical properties of the biochar were characterized using FT-IR, SEM, and XRD. The adsorption tests showed that the iron-manganese modified biochar had the best adsorption effect on Cd2+ ions.
Article
Engineering, Environmental
Jinxiu Li, Jinxin Zhao, Bing Li, Huaitian Bu, Weizhao Yin, Sihao Lv, Jinhua Wu
Summary: In this study, activated carbon-supported goethite was used as a catalyst to effectively inactivate Escherichia coli. The heterogeneous Fenton catalyst achieved a higher inactivation efficiency compared to using goethite or activated carbon alone. The catalyst generated hydroxyl radicals to destroy the cell membrane and intracellular substances of E. coli, resulting in effective inactivation. Furthermore, the catalyst showed excellent stability and reusability, making it a promising candidate for surface water treatment.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Yike Shen, Hui Li, Elliot T. Ryser, Wei Zhang
Summary: This study revealed significant differences in the uptake and transport of different antibiotics in plants under soil-surface irrigation, highlighting the need for further investigation in diverse soil-plant systems.
Article
Environmental Sciences
Yao-Jen Tu, Gnanasiri S. Premachandra, Stephen A. Boyd, J. Brett Sallach, Hui Li, Brian J. Teppen, Cliff T. Johnston
Summary: The synthesis of a magnetic activated carbon composite (AC-Fe3O4) for dioxin removal and sampling is described, allowing the adsorbent to be easily recovered from soils using magnetic separation. Six AC-Fe3O4 composites were evaluated for their magnetization and effectiveness in sequestering dibenzo-p-dioxin, showing promising results for remediation of PCDD/Fs-contaminated soils and sediments.
Article
Environmental Sciences
Geoff Rhodes, Ya-Hui Chuang, Raymond Hammerschmidt, Wei Zhang, Stephen A. Boyd, Hui Li
Summary: The study compared the uptake and accumulation of the antibiotic cephalexin in different vegetables, finding that the affinity and reaction with plant enzymes play important roles in the uptake and accumulation of cephalexin in vegetables.
Article
Environmental Sciences
Qi Yuan, J. Brett Sallach, Geoff Rhodes, Anthony Bach, Robert Crawford, Hui Li, Cliff T. Johnston, Brian J. Teppen, Norbert E. Kaminski, Stephen A. Boyd
Summary: TCDD is a toxic and persistent organic pollutant. Previous studies showed that TCDD adsorbed to inorganic geosorbents had similar bioavailability to mice as TCDD dissolved in corn oil, while sequestration by activated carbons eliminated bioavailability.
Article
Energy & Fuels
Kawthar Z. Alzarieni, Yanfen Zhang, Edouard Niyonsaba, Katherine E. Wehde, Cliff T. Johnston, Gozdem Kilaz, Hilkka Kenttamaa
Summary: Condensate oils are considered good candidates for diluting heavy crude oil to lower viscosity, but can lead to asphaltene precipitation post-dilution. Determining the chemical compositions of condensate oils is crucial for selecting the proper diluent for heavy crude oil. Factors such as API gravity and chemical compositions influence the performance of condensate-like oils in diluting heavy crude oil.
Article
Computer Science, Information Systems
S. R. Jino Ramson, Walter D. Leon-Salas, Zachary Brecheisen, Erika J. Foster, Cliff T. Johnston, Darrell G. Schulze, Timothy Filley, Rahim Rahimi, Martin Juan Carlos Villalta Soto, Juan A. Lopa Bolivar, Mauricio Postigo Malaga
Summary: The development and validation of an Internet-of-Things (IoT) system for continuous soil health monitoring were reported in this study. Significant experiments demonstrated the system's flexibility, wireless communication range, power consumption, and the ability to sustainably operate using solar panel charging. The system can transmit real-time data of soil temperature, moisture, electrical conductivity, CO2 concentration, and geolocation wirelessly for long-term storage and analysis, offering a new method and tool for soil health monitoring.
IEEE INTERNET OF THINGS JOURNAL
(2021)
Article
Chemistry, Physical
Marika Santagata, Cliff T. Johnston
Summary: This study examines the properties and roles of water molecules in halloysite, particularly their freezing and dehydration processes. The results show that the interlayer water in halloysite does not freeze and that the water molecules trapped in the cavities are more hydrogen bonded and more ordered.
APPLIED CLAY SCIENCE
(2022)
Article
Environmental Sciences
Wenfeng Wang, Geoff Rhodes, Wei Zhang, Xiangyang Yu, Brian J. Teppen, Hui Li
Summary: Experimental results suggest that multivalent exchangeable cations play a significant role in the sorption and transport of PFCAs in soils, with Ca2+ and Fe3+ soils exhibiting higher sorption capacities for PFCAs compared to K+ soils.
Article
Energy & Fuels
Jeremy Manheim, Wan Tang Jeff Zhang, Yingxuan Cheng, Ravikiran Yerabolu, Cliff T. Johnston, Hilkka Kenttamaa
Summary: Enhanced oil recovery (cEOR) is a costly process with low levels of oil recovery. This research study utilized the fractionation step to determine the types of compounds in crude oil that are strongly or weakly bound to kaolinite, a prevalent clay mineral found in oil reservoirs. The results showed that nonpolar compounds prefer to bind to kaolinite, which has implications for increasing the economic feasibility of cEOR.
Article
Energy & Fuels
Mohammadhasan Sasar, Cliff T. Johnston, Marika Santagata
Summary: This study investigated the characteristics of residual organics in fluid fine tailings (FFTs) generated by surface mining of oil sand ore bodies and the effects of polymeric flocculation on mineral-organic interactions. The findings revealed differences in residual organics between different bitumen extraction processes and the continued release of bitumen after polymeric flocculation.
Article
Engineering, Environmental
Yuanbo Li, Jonathan Brett Sallach, Wei Zhang, Stephen A. Boyd, Hui Li
Summary: It is challenging to predict the uptake of pharmaceuticals by plants from soils due to the high variability of sorption/desorption and transformation processes. This study found that the concentration of pharmaceuticals in soil pore water is strongly correlated with their accumulation in radish, suggesting that pore water is the dominant fraction bioavailable to plant uptake. Root concentration factors based on soil pore water concentration showed more consistent results compared to those based on soil concentration, indicating that pore water-based factors are better for describing pharmaceutical accumulation in plants. The findings emphasize the importance of evaluating and including pharmaceuticals in soil pore water in models for plant uptake prediction.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Zeyou Chen, Lichun Yin, Wei Zhang, Anping Peng, J. Brett Sallach, Yi Luo, Hui Li
Summary: Soil salinity can affect the bioavailability of antibiotics to bacteria, with high salinity potentially increasing the selection pressure exerted by antibiotics on bacteria.
Article
Chemistry, Physical
Tuan A. Ho, Yifeng Wang, Susan B. Rempe, Nabankur Dasgupta, Cliff T. Johnston, Guangping Xu, Timothy S. Zwier, Melissa Mills
Summary: Using metadynamics molecular dynamics simulations, we investigated the energy landscape associated with CO2 intercalation into clay interlayers. Our free energy calculations revealed that CO2 preferentially partitions into nanoconfined water in clay interlayers, resulting in an increased CO2/H2O ratio compared to the bulk water. The distribution of structural charges significantly influences the amount of CO2 intercalated in the interlayers. These findings provide a mechanistic understanding of CO2 intercalation in clays for CO2 separation, capture, and storage.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Review
Environmental Sciences
Hui Li, Pulane Koosaletse-Mswela
Summary: This review provides an overview of the sources, sorption and transport behaviors, and remediation strategies of per- and polyfluoroalkyl substances (PFAS) in soils. Biosolids land application and aqueous firefighting foam are the major sources of PFAS contamination in soils. The sorption of PFAS by soils involves multiple interaction mechanisms, influenced by PFAS chemical structures, soil properties, and surrounding solution chemistry. Remediation techniques for PFAS-contaminated sites have limited documented information, hindering the comparison and evaluation of specific remediation technologies. Future research prospects and knowledge gaps are also identified.
CURRENT OPINION IN ENVIRONMENTAL SCIENCE & HEALTH
(2023)