Article
Electrochemistry
Hyo Chan Lee, Hee-Jo Lee, Bo-Hye Kim
Summary: This paper reports the development of boron-containing trilayer structured MnO2/carbon nanofiber composites as promising supercapacitor electrodes with high electrochemical performance. Through the application of transition metal composites in functionalized porous carbon nanofiber electrodes, combined with the hierarchical porosity of carbon nanofiber, high electrochemical activity of MnO2, and increased electrical conductivity by boron functional groups, high specific capacitance, good rate capability, and cycling stability are achieved.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Shuangshuang Cui, Dan Zhang, Yang Gan
Summary: Rechargeable aqueous Zn/MnO2 batteries are highly regarded due to their high capacity and safety. Pre-adding Mn2+ in the electrolyte has been widely used to improve the electrochemical performance of these batteries. However, the reaction mechanism of MnO2 electrode during long cycles with Mn2+ pre-added in electrolyte is still unclear. This study elucidates the reaction process of 8-MnO2 electrode with different concentrations of Mn2+ pre-added in electrolyte.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Hyo Chan Lee, Yoong Ahm Kim, Hee-Jo Lee, Bo-Hye Kim
Summary: This paper presents the capacitive behavior of N-enriched carbon nanofiber/MnO2/carbon nanofibers with a triple layer structure prepared by continuous electrospinning. The introduction of N-functional groups in different layers of the triplex leads to various structural and electrochemical properties. The optimized material exhibits excellent capacitance retention, high energy density, and cycling stability, making it a promising electrode for high-voltage asymmetric supercapacitors in aqueous electrolytes.
Article
Chemistry, Physical
Yueting Guo, Lingce Kong, Meiling Lei, Yi Xin, Yanjun Zuo, Wenming Chen
Summary: In this study, four MnO2 samples with different crystallographic structures were synthesized and their degradation ability against sulfur mustard simulant 2-CEES was investigated. Characterization data showed different crystal types exhibited various properties, leading to differences in degradation activity. The mechanism of 2-CEES degradation involved substrate hydrolysis and oxidation.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Environmental
Ting-Ting Lv, Guang-Xun Zhang, Sha-Sha Zheng, Xiao-Tian Guo, Ting-Ting Chen, Sheng-Yang Yang, Huan Pang
Summary: In this study, a hollow heterostructure Co3V2O8@MnO2 was successfully synthesized by a simple hydrothermal method and an in-situ growth strategy. This material, as a free-standing aqueous zinc-ion batteries cathode, exhibits high conductivity and a hollow structure that can prevent volume change. It also provides sufficient active sites for the electrolyte, resulting in a high discharge capacity and desirable rate performance.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Christina Floraki, Maria Androulidaki, Emmanuel Spanakis, Dimitra Vernardou
Summary: This study utilized a simple multiple-pass deposition technique to form a LiFePO4 cathode on graphite. The cathode showed a thick layer consisting of non-uniform flake-like particles. Testing in different LiOH concentrations revealed that the highest ion transfer occurred in 2 M LiOH. However, the 1 M aqueous LiOH electrolyte exhibited satisfactory ion storage and stability.
Article
Chemistry, Physical
Zeyu Zhao, Ganggang Li, Yonggang Sun, Na Li, Zhongshen Zhang, Jie Cheng, Chunyan Ma, Zhengping Hao
Summary: The presence of H2O vapor has a significant impact on the catalytic oxidation of acetaldehyde with different MnO2 phases, promoting the reaction at moderate temperatures and hindering it at high temperatures.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Multidisciplinary
Firas S. Alruwashid, Mushtaq A. Dar, Nabeel H. Alharthi, Hany S. Abdo
Summary: A two-step method was applied to synthesize cobalt ferrite-graphene composite materials in a one-pot hydrothermal reaction process. The synthesized composite materials showed good conductivity and corrosion resistance, which could be attributed to the high conductivity and reactivity of graphene.
Article
Chemistry, Multidisciplinary
Yifan Wang, Zhengwei Lu, Peipei Wen, Yinyan Gong, Can Li, Lengyuan Niu, Shiqing Xu
Summary: Crystal facet engineering is an effective strategy to regulate the orientations and electrochemical properties of metal oxides. This study successfully synthesized alpha-MnO2 nanorods with different exposed facets and showed that {110} and {310} facets exhibited higher pseudocapacitances due to their stronger adsorption capacity and lower diffusion barriers.
Article
Nanoscience & Nanotechnology
Xiaojuan Tian, Xinyue Cheng, Shiqin Liao, Juanfen Chen, Pengfei Lv, Qufu Wei
Summary: Fiber-based supercapacitors (FSCs) have desirable flexibility and wearability, but their development in practical applications is hindered by low capacity and insufficient fiber strength. In this study, MnO2 nanomaterials with regulatable crystalline structure were synthesized, and MnO2/rGO hybrid fibers were successfully prepared, achieving improved electrochemical performance and fiber strength for FSCs.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Analytical
Zhong Li, Peiyue Yang, Zhongxiang Zheng, Qiyun Pan, Yisi Liu, Yao Li, Jinnan Xuan
Summary: The use of electrochemically active MnO2 as a coating material on LTMO cathode was found to enhance electrochemical performance, offering additional capacity and improved cycling stability.
Article
Energy & Fuels
S. Swathi, R. Yuvakkumar, P. Senthil Kumar, G. Ravi, Dhayalan Velauthapillai
Summary: Calcium tungstate nanostructures assisted by hexamethylenetetramine were successfully synthesized, with surfactant playing a significant role in reducing nanostructure agglomeration. The specific surface area of the nanostructures significantly enhanced hydrogen evolution reaction performance.
Article
Materials Science, Multidisciplinary
Thiruvenkatam Subramaniam, Mustapha Balarabe Idris, G. Harshini Sai, S. Devaraj
Summary: The performance of electrically rechargeable zinc-air batteries depends on the electrocatalysts, specifically MnO2. This study investigates the effect of crystal structure on the kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in MnO2. Five crystallographic forms of MnO2 with similar textural properties are synthesized and the results show that α-MnO2 is the best candidate for ORR and OER.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Acoustics
Ziteng Lian, Sai Yang, Xinhui Peng, Xiaohong Tong, Mengmeng Wang, Shicheng Dai, Tingting Zhu, Huan Wang, Lianzhou Jiang
Summary: In this study, emulsion-filled gels were prepared using natural and pH-shifting combined with ultrasound 0-conglycinin (7S) as emulsifiers. The effects of emulsifier modification and emulsion concentrations on the structural and 0-carotene release properties of the gels were evaluated. The emulsion-filled gels showed improved water-holding and textural properties compared to the 7S hydrogel. The modification of 7S and the increase in emulsion concentration resulted in altered water distribution and improved microstructure and rheological properties of the gels. The gel with an emulsion content of 15 wt% exhibited a dense and homogeneous gel network and showed the highest bioaccessibility and chemical stability with good slow-release properties of 0-carotene. These findings have important implications for the development of encapsulated delivery systems for gel food products.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Chemistry, Physical
Xue Wang, Hanping Zhang, Quanguo Zhai, Yucheng Jiang, Mancheng Hu, Shuni Li
Summary: High-quality protonated Ni-doped MnO2 nanorods were successfully synthesized and applied to Cs+ adsorption, showing high selectivity and adsorption capacity, especially in neutral media. The high adsorption ability of H-Ni-MnO2 NRs can be attributed to their special morphology, Ni doping, and Mn(III) amount enhancement induced by electrochemical reduction.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Biochemistry & Molecular Biology
Xiaolong Ma, Dandan Zhao, Jinjin Qian, Zichuan Ma, Jiansheng Cui
Summary: In this study, a novel approach for utilizing volatile organic compounds (VOCs) was established using coupled oxidation and reduction reactions. The results showed that increasing the temperature and reducing the flow rate enhanced the removal of o-xylene and the reduction of hematite.
Article
Engineering, Chemical
Hao Cai, Dongshuo Zhang, Xiaolong Ma, Zichuan Ma
Summary: In this study, waste pine-attached zinc oxide composites were synthesized and used for the photocatalytic degradation of metronidazole. The composites showed improved photocatalytic activity due to the increased surface area and reduced electronic band gap. Hydroxyl radicals played a dominant role in the degradation process, and the composites exhibited stability and high photocatalytic activity over a wide pH range.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Dandan Zhao, Yuheng Liu, Xiaolong Ma, Jinjin Qian, Zichuan Ma
Summary: Efficient removal of cumene from gaseous streams and recovery of its derivatives were achieved using a MCM-41-supported sulfuric acid (SSA/MCM-41) adsorbent. The process conditions significantly influenced the removal performance, and the spent SSA/MCM-41 could be regenerated for cyclic reuse. Two recoverable adsorbed products were successfully separated and identified.
Article
Chemistry, Physical
Dandan Zhao, Mengze Ma, Jinjin Qian, Yaxu Wang, Zichuan Ma, Xiaolong Ma
Summary: The effects of solvent type on the performance of silica supported sulfuric acid (SSA) adsorbents for removing phenyl VOCs were investigated. The results showed that adsorbents prepared using ethyl acetate solvent exhibited better performance.
Article
Chemistry, Multidisciplinary
Yanhui Zheng, Xifeng Hou, Siqi Lv, Zichuan Ma, Xiaolong Ma
Summary: In this study, beta-cyclodextrin-modified reduced graphene oxide aerogels (beta-CD-rGOAs) were synthesized and used to remove hexamethyldisiloxane from biogas. Characterizations showed that beta-CD was grafted onto the surface of rGOAs as a cross-linking modifier, forming a three-dimensional, cross-linked porous structure. The maximum breakthrough adsorption capacity of L2 on beta-CD-rGOA was 111.8 mg g(-1) at 273 K, and the material could be regenerated by annealing at 80 degrees C, making it promising for L2 removal from biogas.
Article
Chemistry, Physical
Xing Zhou, Huilong Jin, Zichuan Ma, Na Li, Guang Li, Tong Zhang, Pei Lu, Xuzhong Gong
Summary: Carbon-assisted water electrolysis using carbon oxidation reaction reduces energy consumption for hydrogen production. However, mass transfer issues limit its efficiency. This study proposes a biochar sacrificial anode to solve the mass transfer problem, improving both activity and stability. The biochar anode produces less oxygen and has lower potential than a Pt anode, providing a sustainable approach for green hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Green & Sustainable Science & Technology
Xifeng Hou, Yanhui Zheng, Siqi Lv, Zichuan Ma, Xiaolong Ma
Summary: In this study, reduced graphene oxide aerogels (rGOAs) with excellent adsorption performance were successfully synthesized using citric acid-assisted hydrothermal reduction and self-assembly techniques. The rGOAs demonstrated efficient removal of methyl siloxane and exhibited promising recyclability and reusability.
Article
Chemistry, Physical
Dandan Zhao, Jinjin Qian, Yaxu Wang, Zichuan Ma, Xiaolong Ma
Summary: This study investigated the removal of anisole, a representative pollutant, using an MCM-41-supported sulfuric acid (SSA/MCM-41) adsorbent. The results showed that the SSA/MCM-41 adsorbent had a reactive temperature range of 110-140 degrees C, with a removal ratio of anisole greater than 95%. The analysis of process conditions indicated that reducing flow rate increased the theoretical breakthrough time and adsorption capacity, while reducing the inlet concentration or raising the bed height had a slightly decreasing trend in adsorption capacity. The results obtained in this study will contribute to the application of the gas-solid adsorption approach in VOC treatment.
Article
Chemistry, Multidisciplinary
Hao Cai, Tianci Zhao, Zichuan Ma
Summary: Nanoscale magnetic spinel ferrite composites were prepared using a facile impregnation and pretreatment method. The composites were characterized using various techniques, such as XRD, FTIR, SEM, BET, XPS, and VSM. The results showed that the MFe2O4@PC composites exhibited good photocatalytic and adsorption performance for the degradation of MNZ in wastewater.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Xiaolong Ma, Shuqi Li, He Ren, Yin Zhang, Zichuan Ma
Summary: This study proposes an adhesion approach with a mixed suspension containing egg white to prepare a hybrid material of Mg/Al-layered double hydroxide and almond shell biochar. The hybrid material shows higher phosphate adsorption capacity compared to the pure Mg/Al-layered double hydroxide. The study provides an efficient approach to improve the adsorption performance of hard biochar in wastewater treatment.
Article
Biochemistry & Molecular Biology
Xing Zhou, Huilong Jin, Na Li, Xiaolong Ma, Zichuan Ma, Pei Lu, Xiaomeng Yao, Shenna Chen
Summary: Fe-based chemical looping gasification is a clean biomass technology that reduces CO2 emissions and has the potential for self-sustaining operation. This paper proposes a novel process combining Fe-based chemical looping and biomass pyrolysis. The process produces bio-oil, biochar, high-purity hydrogen, and carbon dioxide from rice straw, with high efficiency and CO2 concentration. Compared to biomass direct chemical looping hydrogen generation technology, this new process enhances efficiency.
Article
Chemistry, Physical
Siqi Lv, Xiaolong Ma, Qingling Fu, Yanhui Zheng, Zichuan Ma
Summary: The development of activated porous carbon (APC) with high adsorption capacity for removing volatile methyl siloxane (VMS) has been studied. A high-specific-surface-area APC material with a large porous texture was successfully developed using coconut shell waste and NaOH as the activating agent. The APC material showed remarkable adsorption capacity for hexamethyldisiloxane (L2) and could be easily recycled for sustained adsorption performance even after multiple cycles.
Article
Biochemistry & Molecular Biology
Siqi Lv, Xifeng Hou, Yanhui Zheng, Zichuan Ma
Summary: In this study, Fe3O4-urea-modified reduced graphene-oxide aerogels (Fe3O4-urea-rGOAs) were fabricated using industrial-grade graphene oxide as the raw material. The Fe3O4-urea-rGOAs showed high adsorption capacity for the VMS pollutant and could be easily regenerated, making them promising adsorbents for removing VMS in biogas.
Article
Biochemistry & Molecular Biology
Siqi Lv, Yingrun Wang, Yanhui Zheng, Zichuan Ma
Summary: The hydrophobic APTMS@APC adsorbents were prepared for efficient removal of volatile methyl siloxanes (VMS). The modified APC showed enhanced texture properties and increased adsorption capacity for model pollutant hexamethyldisiloxane. After multiple cycles, the APTMS@APC demonstrated excellent cycling performance, indicating its significance in removing VMS.
Article
Engineering, Environmental
Mengze Ma, Kaiyin Gao, Dandan Zhao, Xiaolong Ma, Zichuan Ma
Summary: Reaction-type adsorption shows promise in the removal of aromatic volatile organic compounds, with SSA/MCM-41 demonstrating potential in removing o-xylene. The dose-response model was found to be the best-fit model for the adsorption process, with a maximum breakthrough adsorption capacity of 545.60 mg.g(-1) determined through experiments.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
