JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2014
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IF 3.552
X. Ge,C.D. Gu,X.L. Wang,J.P. Tu
Manganese oxides with desired structure are controllably obtained through annealing MnCO 3 precursors with required structures. The structures of MnCO 3 precursors are determined by a “mesocrystal formation” process in an ionic liquid system of a choline chloride/urea (CU) mixture. Without addition of surfactants, only CU solvent and manganese chloride are needed in the reaction system, in which the CU acts as reaction medium as well as control agent for particle growth. A shape transformation of MnCO 3 particles from well-defined rhombohedral mesocrystals to ellipsoidal polycrystal ensembles, and to nanoparticulate aggregates is observed when heating the reaction system for 4 h at 120, 150, and 180 °C, respectively. With a longer aging time at 120 °C, etching and disassembly of MnCO 3 mesocrystals happened. The correlation between the microstructure and the underlying formation mechanism is highlighted. Porous and nanowire-like MnO x nanostructures are obtained through a facile thermal conversion process from the diverse MnCO 3 precursors, which are demonstrated as effective and efficient adsorbents to remove organic waste (e.g. Congo red) from water. Significantly, the nanowire-like MnO x nanostructures obtained by annealing the MnCO 3 mesocrystals at 300 °C for 4 h can remove about 95% Congo red in waste water at room temperature in only one minute, which is superior to the reported hierarchical hollow nanostructured MnO 2 .
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
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IF 3.387
Junkai Zhao,Zhixing Wang,Huajun Guo,Xinhai Li
LiNiO 2 -based layered oxides are of great importance as cathode materials for rechargeable batteries. In this paper, illustrating LiNi 0.8 Co 0.15 Al 0.05 O 2 as an example, the effect of nanoscale MnCO 3 treatment on LiNiO 2 -based materials is investigated for the first time. The structures of materials and the properties about the object surface are characterized by XRD, SEM, TEM, EDAX and XPS. The results demonstrate that a part of MnCO 3 is able to react with lithium impurities to form nonstoichiometric Li x Mn y O 4 and the rest of MnCO 3 is converted to MnO 2 coating on the surface of the material in situ. After 100 repeated cycles at 1C, the modified material exhibits a capacity retention rate of 91.2%, while the bare material only remains 84.8%. And the modified material exhibits more significantly improved cycling stability when cycling at 60 °C, maintaining 85.7% of its initial capacity at 1C after 100th cycles. The consumption of Li impurities can decelerate the decomposition of electrolyte during cycling, thus result in less resistive byproducts. Moreover, the obtained MnO 2 coating layer acts as an isolating layer to suppress the drastic reaction between active material and electrolyte. This synergistic effect is responsible for the excellent properties of MnCO 3 -modified material.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Hui Hua Peng,Liang Zhang,De Yi Jiang,Jie Chen
Rhombohedral MnCO 3 nanoparticles were successfully grown on nickel foam via a facile and one-pot water-bath means, wherein the hydrolyzation of urea supplied alkali and carbonate ions. The structure and morphology of the nanocomposites were investigated by XRD, FIB/SEM and elemental mapping. Microscopic investigations revealed MnCO 3 particles with mean sizes that varied from 110-255 nm. EDS mapping showed a homogeneous distribution of manganese, carbon and oxygen. The electrochemical properties of the produced composites were estimated by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) measurements using 6 M KOH as the electrolyte. The resulting electrodes displayed maximum specific capacitance (163.7 F g -1 at 0.5 A g -1 ), respectable rate capability, and excellent long-term cycling life (91% retention after 1000 cycles). In addition, this manuscript offers us a simple and rapid strategy for the fabrication of electrode materials for use as energy storage devices.
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
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功能材料
✓ 已验证
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 24
·期 4
·301-307
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IF 0
Qi Wei,Fang Jie,Yang Zhenzhen,Li Bingqi,Su Rongxin,He Zhimin
A low-cost and easily prepared manganese carbonate (MnCO 3 ) has been synthesized for catalytic conversion of 5-hydroxymethylfurfural (5-HMF) to 2,5-diformylfuran (DFF). The properties and morphology of the manganese carbonate were measured by SEM, XRD, TGA, BET and XPS. In this method, no harsh reaction conditions were required, and it was a simple and green process for the oxidation of 5-HMF into DFF. To achieve an optimum DFF yield, different reaction conditions, including reaction temperature, reaction time, catalyst amount, and solvents were investigated. Results from the experiments indicated that the highest DFF yield of 86.9% was obtained at 120 °C under atmospheric oxygen pressure after 6 h. Finally, MnCO 3 could be used at least five times with considerable stability.
研究领域:
催化
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绿色化学
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有机合成
✓ 已验证
产品关联
DOI
Journal of Water Process Engineering
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2024
·
IF 6.3
Yajie Wen,Jiabin Zhou,Lin He,Dan Liu
In this study, manganese from the cathodes for waste batteries (WBCs) was recovered by hydrometallurgical method as a raw material for the peroxymonosulfate (PMS) activator MnCO 3 , which was successfully synthesized by a simple and environmentally friendly process. MnCO 3 had a good degradation properties for oxytetracycline hydrochloride (OTC-HCl). Under the best conditions through the BoxBehnken Design (BBD), the MnCO 3 /PMS system effectively decomposed 91.3 % of OTC-HCl (initial concentration of 60 mg/L), and the Total Organic Carbon (TOC) removal rate was 63.6 % within just 10 min. Moreover, the system exhibits effectiveness over a wide pH range, with its degradation rate remaining largely unaffected by the presence of inorganic anions. Reactive species, including sulfate radicals (SO 4 ·− ), hydroxyl radicals (･OH), superoxide radicals (O 2 ·− ), and singlet oxygen ( 1 O 2 ), are generated by the degradation system. A series of experiments and characterizations demonstrated that 1 O 2 plays a significant role in the degradation system. This study paves the way for the recycling of spent zinc‐manganese batteries and establishes an efficient multi-mechanism degradation system for treating recalcitrant organic wastewater.
研究领域:
环境科学
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化学工程
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废物管理
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水处理
✓ 已验证
产品关联
DOI
高影响因子
Advanced Healthcare Materials
·
2025
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IF 9.6
Heying Chen,Xiaomeng Cai,Jiayu Zhang,Hongyan Sun,Jie Zhang,Jun Chen,Zhenglin Yang,Dongqing Wang
Combination of chemotherapy and cancer immunotherapy has shown substantial clinical promise. However, the immunosuppressive tumor microenvironment (TME) poses a critical barrier to this combination therapy. Here, a tumor lysosome-targeted immunomodulatory strategy based on a biomimetic nanoadjuvant is presented, which effectively overcomes the immunosuppressive TME and demonstrates enhanced therapeutic efficacy when combined with chemotherapy. This nanoadjuvant integrates Fe-DOX coordination nanoparticles, a MnCO 3 shell, TLR7/8 agonist (R848), and a mature dendritic cell membrane (DCM) coating. The resulting DCM@(Fe-DOX-Mn-R848) nanoadjuvant induces immunogenic cell death in tumor cells via lysosomal-mitochondrial cascade destruction. Concurrently, it activates the cGAS-STING signaling pathway to promote dendritic cell maturation and repolarize tumor-associated macrophages from M2 to M1 phenotype, thereby effectively enhancing CD8 + T cell activation and tumor therapeutic efficacy. When combined with PD-L1 blockade therapy, the nanoadjuvant demonstrates enhanced efficacy in murine models of primary and recurrent triple-negative breast cancer, establishing durable immune memory. This platform demonstrates significant potential in overcoming immunosuppressive TME and advancing combination therapy through lysosome-targeting drug delivery technology, revealing promising prospects for cancer treatment.
研究领域:
纳米医学
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免疫学
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癌症生物学
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生物工程
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药理学
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分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）