NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 45
·21285-21292
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IF 3.591
Tianci Wang,Yu Song,Wanna Zhao,Chunmei Zhou,Yuguang Jin,Xiaoyue Wan,Yihu Dai,Yanhui Yang
The oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is one of the most attractive reactions to establish a sustainable chemical process based on biomass resources. In this work, a CNT-supported ruthenium–manganese oxide nano-catalyst (RuO2/MnO2/CNT) was employed for the electro-catalytic oxidation of HMF in base-free aqueous solution. The activity test showed that α-MnO2 can effectively promote the activity of RuO2 in the oxidation of HMF. In comparison with RuO2/CNT, RuO2/MnO2/CNT possessed a lower activation energy and more than twice the FDCA formation rate. Under the optimized reaction conditions, the RuO2/MnO2/CNT catalyst afforded a FDCA yield of 72.1% in a 0.1 M K2SO4 aqueous solution at a 0.9 V (vs. Ag/AgCl) applied potential. To our knowledge, this is the first demonstration of FDCA formation as the primary product with high yield in an initially neutral electrolyte. The product FDCA can be easily separated after cooling the reaction solution to room temperature.
研究领域:
催化
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化学工程
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可持续化学
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生物质转化
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
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IF 4.798
Yuhong Bi,Amit Nautiyal,Huaiping Zhang,Jujie Luo,Xinyu Zhang
A facile and energy efficient microwave synthesis of NiO/MnO 2 composite is presented in this study. The NiO nanoparticles (∼30 nm) and composite of NiO nanoparticles with nano-particle MnO 2 were grown on the surface of graphite. The morphologies and electrochemical performance of NiO@graphite and NiO/MnO 2 @graphite composite were tested and compared. The SEM results showed that addition of MnO 2 prevented the agglomeration of NiO nanoparticles. The electrochemical results of NiO/MnO 2 @graphite has demonstrated better performance than NiO@graphite, with higher specific capacitance of 102.78 mAh g −1 at 1 A g −1 and superior cycling stability with specific capacitance retention of 140% over more than 1500 cycles. The excellent electrochemical performance of NiO/MnO 2 @graphite makes it suitable for electrode material of supercapacitors .
研究领域:
材料科学
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电化学
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纳米技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 41
·15524-15531
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IF 8.067
Yang Han,Yangsai Lyu,Ningning Xing,Xiaolei Zhang,Kaiyuan Hu,Hui Luo,Dickon H. L. Ng,Jia Li
Micromotors that combine the merits of micro-devices with specific functions and autonomous motion have numerous applications in environmental remediation. However, their practical application is blocked by low productivity, a complex preparation process and high cost. Herein, we developed a facile biomass route to synthesize ion-imprinted MnO2/CoFe2O4 Janus micromotors with appealing recognition and capture capacities for Pb(II) ions. Owing to the combination of autonomous motion, the ion imprinting technique, and magnetic recovery, the ion-imprinted MnO2/CoFe2O4 Janus micromotors exhibited highly sensitive and selective adsorption and quick removal of lead ions from water. Such a Janus micromotor reveals great potential in environmental remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2018
·Vol. 7
·期 4
·1800912
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IF 3.175
Hang Wei,Xiao Hu,Xianfeng Zhang,Zhifeng Yu,Tianyi Zhou,Yang Liu,Yongguang Liu,Yue Wang,Jiexin Xie,Lianfeng Sun,Minghui Liang,Peng Jiang
Rechargeable zinc-based aqueous batteries are a promising candidate for next-generation energy storage devices because of the high theoretical energy density of Zn as well as the availability, safety, and cheap price of Zn-based aqueous batteries. A Zn@C core–shell composite is designed to overcome two problems of Zn anodes, that is, the formation of Zn dendrites and the corrosion/loss of Zn anode during the charge–discharge process, influencing the lifetime of Zn-based aqueous batteries. The prepared Zn@C composite from ZnO@C with electrochemical reduction is robust as the anode for a Zn@C//MnO 2 battery, and a 98.8% retention after 400 cycles is obtained at a discharge rate of 5 C. The specific capacitance of Zn@C//MnO 2 battery can reach 135 mAh g Zn −1 at 3 C, and the energy density of this battery can reach 75.9 Wh Kg −1 . The coated carbon layer on Zn/ZnO plays a role in protecting Zn/ZnO from leaching or corrosion by KOH, so the structure of Zn@C is a key factor in improving the cycling lifetime of Zn-based aqueous batteries.
研究领域:
能源存储
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材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 9
·1-16
·
IF 5.3
Meng Jingjing,Han Lu,Li Lu,Yin Xue-bo,Zheng Jing
Manganese dioxide (MnO 2 )-based heterogeneous catalysts have gained significant attention in nanozyme research due to their exceptional oxidase-mimicking capabilities. This work reports the rational design of MnO 2 functionalized magnetic carbon nanotubes (Fe 3 O 4 @C@MnO 2 ) through a multistep synthesis strategy. The magnetic N-doped hollow carbon substrate (Fe 3 O 4 @C) was first synthesized via controlled pyrolysis of FeOOH-coated polydopamine precursors. Subsequent interfacial redox reaction with KMnO 4 enabled the in situ deposition of ultrathin MnO 2 nanosheets on the nanotube substrate, forming a triple-component coaxial architecture. This hollow structure not only facilitates dense MnO 2 deposition but also maintains robust magnetic responsiveness. The obtained Fe 3 O 4 @C@MnO 2 exhibits remarkable enzyme-mimetic capability, catalyzing TMB chromogenic conversion with 0.92-fold enhanced catalytic performance relative to pristine MnO 2 . Systematic mechanistic studies reveal that tannic acid (TA) competitively inhibits ·OH radical generation via MnO 2 -TA complexation, while the carbon interlayer enhances electron transfer efficiency. Owing to the superior enzyme-mimetic performance of Fe 3 O 4 @C@MnO 2 and their inhibition effect by TA, a sensitive colorimetric biosensing assay was fabricated, achieving a TA detection limit of 0.029 μM with a 0.096–4.82 μM linear concentration range. This work exemplifies the synergy of structural engineering and component optimization in designing multifunctional nanozymes, showing potential applications in food quality monitoring, environmental analysis, and point-of-care diagnostics. Graphical
研究领域:
纳米酶技术
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纳米材料合成
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生物传感器
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环境分析
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食品安全监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Yu Chen,Zenghui Mai,Senqing Fan,Yuyang Wang,Boya Qiu,Yilin Wang,Jiaojiao Chen,Zeyi Xiao
A catalytic membrane micro-reactor (CMMR) with nano MnO 2 /ZIF-8 immobilized in membrane pores has been fabricated by flowing synthesis and formaldehyde degradation was used to test its catalytic performance. The CMMR with deep-permeation nano structure (DPNS) has good stability, uniform nano MnO 2 /ZIF-8 dispersion and higher loading capacity. The MnO 2 coated on the surface of nano ZIF-8 with the size in the range of 100–150 nm was obtained. The contact between formaldehyde and MnO 2 is enhanced by the effect of even disperse of membrane pores. The enhanced mass transfer can be achieved in the micro-scale pores of the membrane by the confined space effect. A higher amount of MnO 2 loading and higher formaldehyde absorption rate can be achieved by the effect of ZIF-8 in membrane pores. The formaldehyde degradation rate was increased from 82.6% to 94.0%, if the MnO 2 loading capacity was increased from 98 mg g −1 to 344 mg g −1 .
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 10
·1-14
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IF 5.7
Liu Jian,Wen Changchun,Hu Miaomiao,Leng Nan,Lin Xiang-Cheng
MnO 2 nanosheets (MnO 2 NSs) were synthesized by one-step method, and MnO 2 NSs were applied to A549 cell chemodynamic Therapy (CDT). The cytotoxicity, redox ability, and reactive oxygen species production of MnO 2 NSs have been investigated, and differences in cell metabolism during CDT were determined using liquid chromatography-mass spectrometry (LC–MS/MS). In addition, the metabolites of A549 lung cancer cells affected by MnO 2 NSs treatment are identified; metabolite differences were identified by PCA, PLS-DA, orthogonal PLS-DA, and other methods; and these differences were analyzed using non-targeted metabolomics. We found that A549 cells which were treated by MnO 2 NSs have 17 different metabolites and 9 metabolic pathways that varied markedly. Owing to their unique composition, structure, and physicochemical properties, MnO 2 NSs and their composites have become a favored type of nanomaterial used for CDT in cancer therapy. This work provides insights into the mechanism underlying the effects of MnO 2 NSs on the tumor microenvironment of A549 lung cancer cells, effectively making up for the deficiency of the study on cellular mechanism of CDT-induced apoptosis of cancer cells. It could aid the development of cancer CDT treatment strategies and help improve the use of nanomaterials in the clinical field. Graphical Abstract
研究领域:
纳米技术
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癌症生物学
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代谢组学
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药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Yuan Zhang,Dong Wang,Gaili Liu,Yongjia Xiang,Kun Wang,Shaomin Shuang,Chuan Dong
2-Mercaptobenzothiazole (MBT) poses an unignorable risk to the aquatic environment and human health. Traditional analysis and prevention methods are unsuitable for broader applications due to their complexity and high-cost instruments. To address these challenges, a novel CuO@MnO 2 (CM) nanozyme has been designed to establish absorbance-colorimetric dual-mode sensing and modulate the content of MBT through reactive oxygen species (ROS) mediated oxidative degradation . CM nanozyme exhibits notable catalytic ability with K m 13.6 μM and V max 0.763 μM/s. Furthermore, by integrating the generated 1 O 2 , O 2 •- and •OH in the presence of O 2 , the absorbance and colorimetric method for MBT sensing is developed, offering a linear detection range from 0.1 to 15 μM through the color change of 3,3′,5,5′-tetramethylbenzidine (TMB) and TMBox. Besides, the CM nanozyme can oxidatively decompose MBT, significantly reducing its biotoxicity without needing photocatalytic auxiliary equipment. This work presents a promising MBT detection and degradation approach in future applications.
研究领域:
环境科学
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生物化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Chuan Shi,Haohao Cui,Enhui Ma,Ke Wang,Hong Wang
The large amount of mineral processing wastewater generated during the extraction of rare earth elements, especially the organic flotation reagents inside, has posed great environmental threats. In this work, a facile method to prepare tubular micromotors based on CuS and MnO 2 was proposed, followed by further integration of Bi 2 MoO 6 on the micromotor surface to enhance the photocatalytic activity. The resulting Bi 2 MoO 6 @MnO 2 @CuS tubular micromotors which could realize autonomous motion by the generation of abundant micro/nanobubbles were employed for the removal of salicylhydroxamic acid (SHA), a commonly used reagent in rare earth ores flotation, via photo-assisted Fenton-like processes. The incorporation of Bi 2 MoO 6 in the tubular structure increased the SHA removal efficiency under visible light by 32.51 %. Moreover, the synergistic effect between photocatalysis and Fenton-like processes contributed to a SHA removal efficiency of 95.51 % within 30 minutes. A possible mechanism was proposed to explain the enhanced catalytic activity of the tubular micromotors. This study provides a way to fabricate tubular micromotor with low-cost and stable materials in batches, which may shed light on the treatment of rare earth ore processing wastewater.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Yingguang Zhang,Muyan Wu,Yifei Wang,Yu Ho Kwok,Wending Pan,Wai Szeto,Haibao Huang,Dennis Y.C. Leung
The particular role of fluorine (F) doping in the photocatalytic activity of nanocrystalline titanium dioxide (TiO 2 ) towards toluene degradation was systematically studied. TiO 2 nanosheet catalysts doped with different amounts of F − (denoted by F-TiO 2 ) were synthesized by hydrothermal method. For comparison, calcination was performed on the catalyst to remove F - . The photocatalytic oxidation (PCO) of toluene over F-TiO 2 was found to be much higher than those of TiO 2 and commercial P25 under the irradiation of vacuum ultraviolet (VUV) light, with a high toluene degradation efficiency of about 90 %. Moreover, the toluene degradation efficiency increased to 96 % with the addition of only 1 wt.% α-MnO 2 nanowires, and the residual ozone (O 3 ) in the system can be completely eliminated. In addition, four different substrates were explored for catalyst coating to facilitate the operation and minimize catalyst loading, which can provide a promising strategy for practical volatile organic compounds (VOCs) abatement in industrial applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Dong-Shuai Li,Qing-Li Gao,Hui Zhang,Yi-Fan Wang,Wei-Liang Liu,Man-Man Ren,Fan-Gong Kong,Shou-Juan Wang,Jin Chang
The growing demand for energy storage devices leads to great interest in advanced batteries researches. Among them, aqueous rechargeable zinc ion batteries (ARZIBs) has attracted wide attention due to their low cost, simple manufacturing process and environmental friendliness. Here, we prepared a composite material, namely MnO 2 particles grown on the surface of N-doped hollow porous carbon nanospheres, that is, combining hollow carbon material with metal oxides, and employed it as the cathode of ARZIBs. Owing to the synergistic merits of desirable structural features of manganese oxides and hollow porous carbon nanospheres, the composite material exhibited excellent performance for the storage of zinc ions, including high capacity of 206 mA h g −1 at 100 mA g −1 , impressive rate capability of 103 mA h g −1 at 500 mA g −1 and superior cycling stability with the coulombic efficiency (capacity retention) of 98.3% over 650 cycles. The distinguished electrochemical behavior is attributed to the synergistic effects of desirable structural features of manganese oxides and hollow porous carbon nanospheres, which can be summed up as larger electron modified interface, high mass loading, and stable carbon-layer structure. These results demonstrate that the composite material could satisfy the criteria for applying in advanced ARZIBs.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2023
·Vol. 10
·期 5
·1428-1440
·
IF 7.3
Xixi Chen,Yanjun Li,Wanyi Fu,Shuanghong Tian,Yulong Yang,Kai Yang,Xuanbo Xu,Xihui Zhang
The importance of nonradical Fenton-like catalysis in environmental fields has motivated research for effective singlet oxygen (1O2) production, but realizing the accurate design and regulation of active sites for manipulating oriented 1O2 generation is still highly challenging. In this study, α-, β-, and γ-MnO2 catalysts with different oxygen vacancy (OV) abundance were fabricated to activate H2O2 to generate 1O2 for the degradation of oxytetracycline (OTC). The OV-rich α-MnO2 had a high OTC removal efficiency (>93.5%) at the pH range from 4.0 to 11.0. Moreover, α-MnO2 exhibited great applicability for a real water matrix, and the total removal of various kinds of emerging contaminants from hospital wastewater reached up to 97.4%. The excellent performances of α-MnO2 were attributed to the rich contents of OVs that induced the oriented generation of 1O2. Theoretical density functional theory (DFT) calculations validated that the OV-rich α-MnO2 had the highest H2O2 adsorption ability (−1.39 eV) and the lowest energy barrier (0.41 eV) for the dissociation of *OH to form the *O intermediate, which promoted the oriented formation of 1O2. This work provides a strategy of manipulating the oriented generation of 1O2 towards water decontamination via regulating the abundance of oxygen vacancies in α-MnO2 nanocatalysts.
研究领域:
环境科学
·
催化化学
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）