CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Aimal Khan,Habib Ullah,Qinghong Wu,Wenqiang Gong,Lu Ma,Shuaiqi Zhao,Aihua Xu,Xiaoxia Li
Understanding the role of oxygen vacancies (OVs) in endowing catalytic activity is important for the design of efficient catalysts for advanced oxidation processes. In this study, we prepared MnO catalysts with different amounts of OVs under an atmosphere of H 2 (MnO-H) and N 2 (MnO-N) and investigated their acetaminophen (ACE) degradation efficiency via peroxymonosulfate (PMS) activation. MnO-H exhibited the best degradation performance because of its numerous OVs, compared with that of MnO-N and the commercial MnO. Data analysis revealed that ACE degradation proceeded via electron transfer. Density functional theory calculations confirmed that compared with the other catalysts, MnO-H/PMS with more OVs had higher catalytic activity, higher adsorption energy, lower work function, and higher electron transformation. The MnO-H/PMS system was stable at pH 3.0–9.0 and showed good recyclability. We believe that our findings will provide deeper insights into the role of OVs and encourage the use of less toxic metal oxides as catalysts in the selective degradation of organic pollutants in water bodies.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 31
·
IF 1.768
Haitao Huang,Tao Yue,Yanyun Xu,Ke Xu,Haibo Xu,Shiyuan Liu,Jiahui Yu,Jin Huang
To enhance biocompatibility and physiological stability of hydrophobic MnO nanoparticles as contrast agent of T 1 -weighted magnetic resonance imaging (MRI), dopamine-functionalized poly(ethylene glycol) (PEG) was used to coat the surface of about 5 nm MnO nanoparticles. Although hydrophilic coating might decrease longitudinal relaxivity due to inhibiting the intimate contact between manganese of nanoparticle surface and proton in water molecules, higher longitudinal relaxivity was still maintained by manipulating the PEGylation degree of MnO nanoparticles. Moreover, in vivo MRI demonstrated considerable signal enhancement in liver and kidney using PEGylated MnO nanoparticles. Interestedly, the PEGylation induced the formation of about 120 nm clusters with high stability in storing and physiological conditions, indicating passive targeting potential to tumor and prolonged circulation in blood. In addition, the cytotoxicity of PEGylated MnO nanoparticles also proved negligible. Consequently, the convenient PEGylation strategy toward MnO nanoparticles could not only realize a good “trade-off” between hydrophilic modification and high longitudinal relaxivity but also contribute additional advantages, such as passive targeting to tumor and long blood circulation, to MRI diagnosis of tumor. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42360.
研究领域:
材料科学
·
医学影像学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Shouji Huang,Huapeng Li,Guobao Xu,Xiong Liu,Qi Zhang,Liwen Yang,Juexian Cao,Xiaolin Wei
We develop a facile and low-cost method to construct porous N-doped carbon sheets wrapped MnO cubes with average size of 150 nm in 3D carbon networks by one-step pyrolysis strategy. The unique and novel nanostructure not only provides holes to promote fast ion transport and conductive framework to enhance the charge transfer, but also effectively supplies an elastic buffer space to accommodate volume expansion during cycling. Furthermore, kinetic analysis and other tests reveal that capacitive-controlled Li storage is a vital way and further oxidation of Mn 2+ to a higher state with cycling contributes a lot of capacity. As a result, the composite electrode shows high specific capacity of 917 mAh g −1 at 0.2 A g −1 after 190 cycles, outstanding rate capability of 328 mAh g −1 at 5 A g −1 , and long cycling stability (655 mAh g −1 at 1 A g −1 after 550 cycles, capacity retention of 105%). Furthermore, the composite electrode and LiFePO 4 are used as anode and cathode to assemble full cell which also exhibits excellent rate capability and cycling stability, indicating great application potential. The simple and low-cost strategy of synthetizing the unique nanocomposite structure can also be applied to other composite anode materials for lithium-ion batteries.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Huilu Guo,Xiaojian Mao,Jian Zhang,Run Tian,Shiwei Wang
Attempts have been made to manufacture AlON transparent ceramics at low temperature using a new sintering aid system, Y 2 O 3 -La 2 O 3 -MnO. The sintering behaviors, including relative density and microstructure evolution of AlON ceramics doped with Y 2 O 3 -La 2 O 3 , MnO alone, and Y 2 O 3 -La 2 O 3 -MnO were compared. It was found that both the relative densities and grain sizes of samples doped with Y 2 O 3 -La 2 O 3 -MnO were much higher and larger than those of samples doped with Y 2 O 3 -La 2 O 3 or MnO alone, respectively. A liquid phase containing Al, O, N, Mn, and La formed at high temperature and played an important role on both eliminating pores and promoting grain growth of the sintered AlON bodies. Finally, translucent AlON ceramics were obtained through pressureless sintering at 1830 °C for 1 h, ~100 °C lower than those with conventional sintering aid Y 2 O 3 -La 2 O 3 . The ceramics doped with MnO showed green emission at 534 nm, under 445 nm excitation. We believe Y 2 O 3 -La 2 O 3 -MnO is a promising additive for the preparation of AlON transparent ceramic at lower temperature.
研究领域:
材料科学
·
陶瓷工程
·
光学材料
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Peng Miao,Zhen Yu,Weixing Chen,Rui Zhou,Weifeng Zhao,Kai-Jie Chen,Jie Kong
High-performance microwave-absorbing materials (MAMs) derived from metal–organic frameworks (MOFs) have attracted considerable attention due to their tunable chemical composition and microstructure. In this contribution, a core–shell-structured Co/MnO/C nanocomplex was prepared using a CoMn-MIL MOF by a facile hydrothermal synthesis and subsequent pyrolysis process. The optimal microwave absorption (MA) property of the as-prepared Co/MnO/C nanocomplex was achieved by the regulation of the Co2+/Mn2+ molar ratio. The minimum reflection loss (RLmin) of the Co/MnO/C-31 nanocomplex was low to −55.0 dB at 16.2 GHz with a thickness of 1.49 mm, and the effective absorption bandwidth (EAB) was high to 5.95 GHz (12.05–18 GHz) at a thickness of 1.8 mm. The mixed-metal nanocomplex with the core–shell structure exhibited outstanding MA performance, corresponding to the synergetic effect of the magnetic and dielectric loss. It provides a high efficiency strategy for rendering low reflection loss and broad EAB to high-performance MAMs.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xiaoming Yu,Weixin Chen,Junjie Cai,Xia Lu,Zhipeng Sun
A modified separator for improving the electrochemical performance in Li-S batteries is fabricated by functional composites coating, comprised of MnO nanoflakes with rich oxygen vacancies and N doped carbon nanotubes (MnO-OVs/NCNTs). On the one hand, MnO as a polar material can anchor lithium polysulfides (LiPSs) on the interface via chemical bonding. In addition, introducing oxygen vacancies into MnO by heat treatment under a reducing atmosphere can regulate the electronic structure and provide extra active sites for further boosting the chemical adsorption capability of LiPSs, facilitating the redox reaction of LiPSs, as well as enhancing the electron transfer efficiency. On the other hand, the MnO-OVs/NCNTs layer is a barrier to block the LiPSs directly diffusing through the separator and acts as an upper collector to reduce the interface resistance reactivate the trapped sulfur species, thereby enhancing the sulfur utilization. Given these advantages, the MnO-OVs/NCNTs modified separator employed in Li-S batteries exhibit considerable capacity (1516 mAh g −1 at 0.1C), enhanced long-term cycling stability (capacity retention of 618 mAh g −1 for over 500 cycles at 1C), and rate performance (550 mAh g −1 at 3C).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROANALYSIS
·
2023
·Vol. 36
·期 4
·e202300371
·
IF 3
Wenjing Liu,Sumin Xu,Jinjin Zhang,Qi Wang,Jianying Qu
In this work, manganese-based metal-organic frameworks (MnBDC) were synthesized by solvothermal method and physically mixed with pre-prepared graphene oxide (GO) to obtain GO/MnBDC, which were calcined to give MnO@C composite coated with reduced graphene oxide (rGO) marked as rGO/MnO@C. The materials were characterized by SEM, XRD, FTIR and XPS. Based on this composite, a novel sensor was constructed on a glassy carbon substrate, which exhibited good electrocatalytic activities to the redox reactions of catechol (CC) and hydroquinone (HQ), enabling simultaneous detection of both analytes. Under optimized conditions, the electrochemical sensor demonstrated a linear range of 0.50–90.00 μM for both CC and HQ detection, with respective detection limits of 0.05 μM and 0.03 μM. Moreover, the sensor exhibited excellent sensitivity, selectivity and accuracy for detecting CC and HQ simultaneous in real samples.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Lijuan Peng,Xiaomin Peng,Zhaogen Zhu,Qianqun Xu,Kaifen Luo,Zhaotong Ni,Dingsheng Yuan
Developing the low-cost, durable, and efficient bifunctional electrocatalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) plays an important role in the commercial implementation of the Zn-air batteries. Herein, we design and synthesize the MnO and Co nanoparticles coated with N-doped carbon (MC@NC) as an excellent bifunctional oxygen electrocatalyst. It is found that the optimal MC@NC-0.3 exhibits outstanding ORR performance with a positive half-wave potential of 0.82 V and excellent OER activity with a small overpotential of 360 mV at 10 mA cm −2 . When applied in the liquid Zn-air battery, MC@NC-0.3 displays a high maximum power density of 153 mW cm −2 , a large specific capacity of 776 mAh g −1 and the excellent cycling stability with a negligible increase after 300 h. Furthermore, the fiber-shaped all-solid-state Zn-air battery also displays remarkable stability at high current density . This study offers a facile strategy to construct a high-efficient, low-cost, and durable transitional metal-based bifunctional electrode for renewable energy applications .
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Hafiz Muhammad Adeel Sharif,Muhammad Bilal Asif,Yuwei Wang,Ya-Nan Hou,Bo Yang,Xu Xiao,Changping Li
Iron (Fe)-based catalysts are widely used for taming nitrogen oxides (NO x ) containing flue gas , but the regeneration and long-term reusability remains a concern. The reusability can be acquired by external additives, and resultantly can not only increase the cost but can also add to process complexity as well as secondary pollutants. Herein, a self-sustainable material is designed to regenerate the catalyst for long-term reusability without adding to process complexity. The catalyst is based on reduced graphene-oxide impregnated by Fe 2 O 3 -MnO (rGO@Fe 2 O 3 -MnO; G-F-M) for spontaneous intra electron (e - )-transfer from Mn to Fe. The developed catalyst; G-M-F exhibited 93.7% NO x reduction, which suggests its high catalytic activity . The morphological and structure characterizations confirmed the Fe/Mn loading, contributing to e - -transfer between Mn and Fe due to its conductivity. The synthesized G-F-M showed higher NO x reduction about 2.5 folds, than rGO@Fe 2 O 3 (G-FeO) and rGO@MnO x (G-MnO x ). The performance of G-M-F without and with an electrochemical system was also compared, and the difference was only 5%, which is an evidence of the spontaneous e - transfer between the Mn and Fe-NO x complex. The designed catalyst can be used for a long time without external assistance, and its efficiency was not affected significantly (<3.7%) in the presence of high oxygen contents (8%). The as-prepared G-M-F catalyst has great potential for executing a dual role NOx removal and self-regeneration of catalyst (SRC), promoting a sustainable remediation approach for large-scale applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Yaoqi Huang,Yanxu Wang,Lingwen Song,Yi Yuan,Shaojun Yuan
Hydrogen sulfide (H 2 S) is a hazardous and malodorous pollutant with severe environmental and health impacts. A promising approach for H 2 S removal involves coupling adsorption with low-temperature catalytic oxidation using alkaline metal oxide-loaded carbon-based materials. However, the effectiveness of these materials is often limited by pore blockage caused by metal oxides and desulfurization byproducts. N-doped carbon aerogels offer a solution to this issue due to their large specific surface area and well-developed pore structure. In this study, a novel MgO-MnO-loaded N-doped carbon aerogel (MgO-MnO/NC) was synthesized by one-step high-temperature pyrolysis of cellulose-based aerogel precursor for highly efficient low-temperature H 2 S desulfurization. The effects of pyrolysis temperature and metal oxide loading on H 2 S removal efficiency was systematically investigated. The optimized MgO-MnO/NC-600–0.3 (where 600 represents the pyrolysis temperature and 0.3 denotes the mass ratio of metal salts to cellulose) exhibited outstanding H 2 S removal performance, achieving an ultrahigh desulfurization capacity of 1696 mg/g. The desulfurization conditions, such as O 2 content and relative humidity, were found to play a crucial role in the H 2 S removal process. In situ DRIFTS and XPS analyses revealed a synergistic mechanism of reactive adsorption and catalytic oxidation on the MgO-MnO/NC surface. The desulfurization products were identified as sulfur, sulfate and metal sulfide (MgS and MnS). This study not only proposes a feasible strategy for fabricating biomass-derived aerogel carbon, but also offers valuable insights into the catalytic oxidation of H 2 S for enhancing the desulfurization performance of N-doped carbons.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Gangsheng Zhang,Yi Wang,Meng Chen,Jixiang Xu,Lei Wang
In this work, a carbon-doped Co 3 S 4 /CoSO 4 /MnO catalyst (C@CoSOMn) was prepared in this work by using ZIF-67 as the template. The prepared catalyst was used to degrade levofloxacin (LEVO) by activating peroxymonosulfate (PMS). The optimized catalyst could degrade 97.73 % LEVO within 20 min with a rate constant of 0.294 min −1 . The combination of water-soluble CoSO 4 and Co 3 S 4 made more Co sites accessible to PMS for lasting decomposition to produce active species. Moreover, Mn species with low redox potential could promote the regeneration of Co 3+ and the activation of PMS. The doped carbon could facilitate the transfer of electron. Superoxide radicals (⋅O 2 − ), bulk and surface hydroxyl radicals (•OH), surface sulfate radicals (SO 4 •− ), and electron transfer process, especially the singlet oxygen ( 1 O 2 ) were involved in the LEVO degradation. This study sheds light on the synergism between the Co-based sulfide and the Mn oxide in the activation process of PMS, and might prompt the development of other ZIF-67-derived hybrid materials for environmental remediation.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 4
·e202404857
·
IF 2
Wei Jiang,Chenkang Zhao,Yanfeng Liu,Yu Zu,Hongyu Guo,Guanghui Zhao,Weizhong Wang,Yong Sun
Graphical In this study, a straightforward coprecipitation method was employed to synthesize the bimetallic catalyst MnO@Co-CN, which demonstrates high efficiency in catalyzing the direct oxidative esterification of HMF to produce FDMC with a yield reaching 90.3%. The synergistic interactions between the dual metals during the reaction significantly enhance the catalytic performance for optimal oxidative esterification. As a versatile platform molecule derived from biomass, 5-hydroxymethylfurfural (HMF) has the potential to be transformed into a variety of chemicals. Of these, furan-2,5-dimethylcarboxylate (FDMC) stands out as an excellent precursor for the synthesis of poly(ethylene furandicarboxylate) (PEF), a polymer with broad applications in the production of various polymeric materials. However, a majority of studies have focused on the use of noble metal catalysts to achieve the direct oxidative esterification of HMF for the production of FDMC. Given the scarcity and high cost of noble metal catalysts, there is a pressing need to develop non-noble metal catalysts to efficiently facilitate the direct oxidative esterification of HMF. Accordingly, a bimetallic catalyst, MnO@Co-CN, was prepared in this paper by a simple coprecipitation method, and a 90.3% FDMC yield was obtained under optimal conditions. The findings revealed that in the oxidative esterification of HMF, MnO x predominantly adsorbs the reactants onto the catalyst surface, whereas CoO x is primarily responsible for the oxidation. The synergistic interaction between Mn and Co enhances the catalytic performance, leading to the superior oxidative esterification outcomes. This work offers a cost-effective, scalable method for FDMC synthesis, highlighting potential for industrial applications.
研究领域:
化学工程
·
催化材料
·
可再生资源转化
✓ 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）