Catalysts
·
2022
·Vol. 12
·期 12
·1596
·
IF 4.501
Litao Jia,Fanghua Li,Chenjia Yang,Xiaonan Yang,Beibei Kou,Yonglei Xing,Juan Peng,Gang Ni,Zhong Cao,Shiyu Zhang,Tong Zhao,Xiaoyong Jin
The degradation efficiency of photoelectrocatalytic (PEC) processes for the removal of organic pollutants is highly dependent on the performance of the photoelectroanode catalyst. The design of PEC systems with a direct Z-scheme charge transfer mechanism and visible light excitation is essential to enhance the degradation efficiency of organic compounds. Here, a α-MnO2/BiOI direct Z-scheme heterojunction photocatalyst was successfully synthesized through a convenient and feasible method. It is remarkable that the photoanode exhibited excellent PEC performance under visible light irradiation; a 95% removal rate of tetracycline (TC) pollutants was achieved within 2 h, and it had excellent stability and reusability, which was expected to degrade antibiotics efficiently and environmentally in harsh environments. The presence of oxygen vacancies (OVs) in the α-MnO2/BiOI heterojunction was confirmed by electron spin resonance technique, and the OVs acted as electron traps that contributed substantially to the separation efficiency of photogenerated carriers. ESR characterization showed that the main reactive radicals during TC degradation were •OH and •O2−. By analyzing the intermediates, the possible degradation pathways of TC were further analyzed and a suitable degradation mechanism was proposed. The toxicity changes in the degradation process were explored by evaluating the toxicity of the intermediates. This study provides a new way to enhance the performance of Bi-based semiconductor photocatalysts for the effective degradation of TC in water.Keywords:direct Z-scheme heterojunction;organic pollutants;OVs;PEC
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Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 6
·1775-1785
·
IF 7
Chuyue Cai,Liping Wu,Zhiwei Cai,Fang Yu,Liu Zhang,Liya Wang,Tao Mei,Liangyou Lin,Xianbao Wang
Lithium–sulfur batteries (LSBs) are broadly considered to be the most promising next-generation energy storage because of their ultrahigh theoretical energy density and cost-effectiveness. However, the “shuttle effect” and sluggish conversion kinetics of polysulfides severely hinder their practical application. To address these challenges, a unique Co-doped MnO2 nanorod network layer with oxygen vacancies (Co-MnOx) was devised by self-assembly on a commercial separator through the chemical growth method for high-performance LSBs. The Co-MnOx modified separators (Co-MnOx@PP) not only effectively alleviate the “shuttle effects” but also accelerate the redox conversion of polysulfides. More importantly, the Co-MnOx@PP demonstrated superior thermostability and flame-retardant properties owing to the chemical growth method. The LSBs with Co-MnOx@PP separators exhibited a high reversible capacity of 902.0 mA h g−1 and 562.2 mA h g−1 at 0.5 C for 20 °C and 60 °C after 200 cycles, respectively. Even at 3 C, after 500 cycles, a superb cycling performance of 715.2 mA h g−1 with an ultra-low decay of 0.069% for each cycle was achieved. Therefore, this proposed strategy of a Co-doped MnO2 nanorod network layer with oxygen vacancies will provide a new route for rationally devising durable and efficient LSBs.
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CRYSTENGCOMM
·
2022
·Vol. 24
·期 37
·6546-6557
·
IF 3.756
Quan Zhou,Xingjian Dai,Kailin Li,Chenzhi Zhang,Xinfang Zhang,Zhilan Du,Shuang Yi,Pingan Yang,Jinsong Rao,Yuxin Zhang
Manganese dioxide@NiFe layered double hydroxide@montmorillonite (MNFM) with a nanoflower-like two-dimensional layered core–shell construction has been successfully synthesized by a two-step hydrothermal method. The structural and compositional influences on its electromagnetic wave (EW) absorption characteristics were discussed. MNFM with 8 mm thickness displayed excellent performance, which showed a minimum reflection loss (RLmin) of −21.8 dB at 15.4 GHz and an effective absorption bandwidth of 4.6 GHz. Meanwhile, RLmin was −13.5 dB at 13. 5 GHz when the thickness was 2.8 mm, and the effective absorption bandwidth was 3.31 GHz. The improved EW absorption performance may be attributed to the multilayer core–shell heterostructure leading to multipole relaxations and the ternary composite with excellent impedance matching. Hence, this work introduces a new idea for constructing core–shell clay-based nanocomposites, which are a promising material for EW absorption.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Xiuying Liu,Jiao Zhou,Qianna Xia,Bowen Li,Qiaohui Gao,Shuaiqi Zhao,Aimal Khan,Aihua Xu,Xiaoxia Li
The development of efficient and eco-friendly Mn-based hybrids for the degradation of biorefractory organic pollutants via peroxymonosulfate (PMS) activation is highly desired. In this study, a novel graphite nanosheet (GNs)-based Fe-Mn bimetallic oxide (Fe doped birnessite MnO 2 , FeMn/GNs) was synthesized under mild conditions. Compared with monometallic Fe or Mn oxide on GNs, FeMn/GNs exhibited a higher surface area, decreased Mn oxidation states, stronger interaction with GNs, and more active sites for PMS adsorption. Among different Fe/Mn ratios, Fe 2 Mn 1 /GNs showed the optimum performance for bisphenol A (BPA) degradation with the first-order rate constant of 0.22 min −1 , which was about 8.5 and 12.9 times higher than that of Mn/GNs and Fe/GNs, respectively. Different from the pollutant-catalyst-PMS electron transfer mechanism for Mn/GNs, the direct two-electron transfer in FeMn/GNs+PMS system, was mainly processed between the simultaneously activated BPA and PMS. This was probably based on the double adsorption sites of Fe and Mn species on the same catalyst: PMS was adsorbed by Fe species through hydroxyl groups, while BPA was mainly coordinated with Mn species due to the layered structure and hydrophobicity of the Mn oxide. This study is expected to provide the rational design of efficient Mn-based hybrids for PMS activation.
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 32
·16883-16890
·
IF 14.511
You Xu,Youwei Sheng,Mingzhen Wang,Tianlun Ren,Keke Shi,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
Electrochemical nitrate reduction to ammonia emerges as an attractive and promising technology for nitrate removal from water and simultaneous ammonia electrosynthesis, which demands electrocatalysts with high activity and selectivity. Herein, we designed CuO@MnO2 1D core–2D shell hierarchical nanoarrays supported on a copper foam substrate (CuO@MnO2/CF) for electrocatalytic nitrate-to-ammonia conversion. The decoration of CuO 1D nanowire arrays with MnO2 2D nanosheets brings about abundant exposed active sites and facilitates mass transfer. More importantly, the CuO/MnO2 heterogeneous nanointerface affords a well-designed built-in electric field in the interface region, which could trigger interfacial accumulation of nitrate ions and accelerate nitrate electroreduction kinetics by optimizing the chemisorption of nitrate ions or/and reaction intermediates. With these properties, an impressive electrocatalytic nitrate-to-ammonia capability was achieve over CuO@MnO2/CF (nitrate conversion: 99.38%, ammonia faradaic efficiency: 94.92%, and ammonia selectivity: 96.67%). This study opens new avenues for the rational construction of efficient electrocatalysts for nitrate removal and ammonia electrosynthesis.
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Surfaces and Interfaces
·
2022
·
IF 6.137
Lang Wang,Xinyu Wang,Binxin Song,Zhe Wang,Linlin Zhang,Qiongqiong Lu
MnO 2 is a type of ideal cathode material for aqueous zinc-ion batteries (ZIBs) owing to reasonable price, innocuity, and environmental friendliness. Nevertheless, it plagued by the dissolution of manganese ions and poor electrical conductivity . Therefore, designing and fabricating high-performance MnO 2 based cathode materials are essential for the development of ZIBs. In this work, poly(3,4-ethoxylenedioxythiophene) coated MnO 2 (MnO 2 @PEDOT) is in situ fabricated by mixing 3,4-ethoxylenedioxythiophene (EDOT) and KMnO 4 solution to restrain the dissolution of manganese ions, enhance the electronic conductivity and structural stability. As a result, MnO 2 @PEDOT composite possesses superior electrochemical performance . An outstanding capacity of 242 mA h g –1 at 0.2 A g –1 was reached, and eminent long-term stable cycling performance above 1000 cycles with the capacity retentions of 85.1% at 2 A g –1 was achieved. This study demonstrated a facile in situ synthesis strategy of MnO 2 @PEDOT, and it showed a promising potential for practical application.
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Nanoscale
·
2019
·Vol. 11
·期 33
·15508-15518
·
IF 6.97
Xunan Jing,Yanzi Xu,Daomeng Liu,Youshen Wu,Na Zhou,Daquan Wang,Kai Yan,Lingjie Meng
Although the collaborative therapy of chemotherapy (CT) and photodynamic therapy (PDT) is much more efficient for tumor treatment than monotherapies, premature leakage of drugs from nanocarriers and hypoxia in the tumor microenvironment (TME) result in systemic toxicity and suboptimal therapy efficiency. To overcome these limitations, we developed an intelligent nanoflower composite (termed FHCPC@MnO2) by coating functionalized polyphosphazene on superparamagnetic Fe3O4 nanoclusters and then growing MnO2 nanosheets as an outer shell. The FHCPC@MnO2 nanoflowers with multistage H2O2/pH/GSH-responsive properties could fully exploit TME characteristics, including supernormal glutathione (GSH) levels, low pH and high H2O2, to realize the specific release of drugs in tumors and maximum synergetic therapeutic effects. The MnO2 nanosheets can elevate O2 concentration by catalytic decomposition of H2O2 and can be simultaneously reduced to Mn2+ by overexpressed GSH in the acidic TME. Meanwhile, the inner polyphosphazene containing (bis-(4-hydroxyphenyl)-disulfide) is GSH- and pH-sensitively biodegradable to release the anticancer drug curcumin (CUR) and photosensitizer chlorin e6 (Ce6) in the TME. Therefore, the “triple-responsive” and synergetic strategy simultaneously endows the nanoflowers with specific drug release, relieving hypoxia and the antioxidant capability of the tumor and achieving significant optimization of CT and PDT. In addition, the resulting Mn2+ ions and Fe3O4 core enable in vivo T1/T2 magnetic resonance imaging (MRI), while the released Ce6 can simultaneously provide a fluorescence imaging (FL) function. Unsurprisingly, the intelligent nanoflowers exhibited remarkable multimodal theranostic performance both in vitro and in vivo, suggesting their great potential for precision medicine.
研究领域:
癌症治疗
·
纳米医学
·
材料科学
·
生物医学工程
·
医学影像
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高影响因子
BIOMATERIALS
·
2025
·
IF 12.9
Yaoguang She,Jianxin Cui,Jiamin Ye,Fei Pan,Wenquan Liang,Xiaofeng He,Di Wu,Xiaoyuan Ji,Chunxi Wang
Peritoneal metastasis (PM) is a terminal stage of gastrointestinal cancers, often resulting in poor survival outcomes. Traditional treatments like cytoreductive surgery (CRS) and hyperthermic intraperitoneal chemotherapy (HIPEC) have shown some effectiveness but are associated with significant risks. This study presents a novel nanomotor-based drug delivery system (M@MnO 2 –Au-mSiO 2 @CDDP) designed to enhance the efficacy of PM treatment. By utilizing an oxygen-driven heterojunction nanomotor (MnO 2 –Au-mSiO 2 ), coated with membrane of M1-type macrophages, the system targets PM tumors with high precision through intraperitoneal perfusion. These biomimetic NMs promote deep tumor penetration, enhance reactive oxygen species (ROS) generation, and activate the STING pathway, a critical component in immune regulation. The catalytic properties of MnO 2 within the nanomotors enhance drug permeability and retention, enabling targeted and controlled drug release. Both in vitro and in vivo experiments demonstrated the system's ability to significantly inhibit tumor growth, induce apoptosis, and activate immune responses. In addition, the synergistic effect of targeted drug delivery, catalytic therapy and immunotherapy of this system was further confirmed by constructing an in vitro gastric cancer organoid model, showing great clinical application potential. The study also confirmed excellent biocompatibility and stability, making these NMs a promising clinical tool for the treatment of PM. This research underscores the potential of nanotechnology to revolutionize cancer treatment by overcoming the limitations of traditional therapies and paving the way for future innovations in targeted cancer therapies.
研究领域:
纳米技术
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癌症治疗
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药物递送
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免疫学
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生物医学工程
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肿瘤学
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Zheng-Li Hu,Jiu-Jiu Di,Hao-Yu Lian,Xianliang Yi,Hao Zhou,Yang Liu
Pathway design for reactive oxygen species (ROS) production has raised great interest for advanced oxidation in water treatment. Herein, the surface oxygen vacancies (OVs) on ramsdellite-type MnO 2 were modified via atmospheric-pressure DBD plasma. By simply submitting the MnO 2 powder to N 2 discharge zone, the abundance and reactivity of OVs were improved at a low processing energy (input power 14 W) and after moderate processing time of 20 min (N14-20). The structures were characterized with XRD, FTIR, SEM, (HR)TEM, XPS and CO-TPR. The activities for rifampicin oxidation were evaluated without light illumination, thermal activation or any additional oxidant. The phase composition and surface functional groups were not changed after DBD-N 2 -plasma treatment, but the original big nanorods were collapsed into small flakes. Compared with •OH and 1 O 2 , O 2 •- served as primary ROS for rifampicin degradation. In this process, the dissolved oxygen (DO) in water was the precursor of ROS, and the larger amount of surface OVs on N14-20 remarkably facilitated DO activation into O 2 •- , perfectly eliminating rifampicin ( e.g. , removal for 60 mg/L rifampicin by 0.003 g catalyst was ∼ 70 % for N14-20 and ∼ 60 % for virgin MnO 2 ; removal for 100 mg/L rifampicin by 0.01 g catalyst was 68 % and 53 %, respectively).
研究领域:
环境科学
·
材料科学
·
水处理技术
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zidong Zhang,Ke Ran,Wenjian Wang,Shengling Cao,Rui Zhao,Haiping Zhou,Weidong Xue,Haomiao Li,Wei Wang,Zhou Min,Kai Jiang,Kangli Wang
In this work, we developed Manganese and Titanium based oxide composites with oxygen defects (MnO x @aTiO y ) via plasma processing as anodes of lithium ion batteries. By appropriately adjusting the defect concentration, the ion transport kinetics and electrical conductivity of the electrodes are significantly improved, showing stable capacity retention. Furthermore, the incremental capacity is further activated and long-term stable cycling performance is achieved, with a specific capacity of 829.5 mAh/g at 1 A/g after 2000 cycles. To scrutinize the lithium migration paths and energy barriers in MnO 2 and Mn 2 O 3 , the density functional theory (DFT) calculations is performed to explore the lithium migration paths and energy barriers. Although the transformation of MnO 2 into Mn 2 O 3 through oxygen defects was initially surmised to inhibit Li ions along their standard routes, our results indicate quite the contrary. In fact, the composite's lithium diffusion rate saw a substantial increase. This can be accredited to the pronounced enhancement of conductivity and ion transport efficiency in the amorphous and porous TiO y .
研究领域:
材料科学
·
电化学
·
计算化学
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高影响因子
Nanoscale
·
2021
·Vol. 13
·期 9
·5125-5135
·
IF 7.79
Yang Xi,Xin Xie,Ying Peng,Peng Liu,Jinsong Ding,Wenhu Zhou
Photothermal therapy (PTT) is a promising tumor treatment modality, but its efficacy is strictly hindered by abnormally upregulated heat shock proteins (HSPs) in tumor cells under heat stress. Herein, we developed a flower-like MnO2-coated polydopamine (PDA@MnO2) core–shell nanoplatform with the surface adsorption of HSP70-silencing DNAzyme (DZ) for enhanced PPT. The PDA core acted as a robust photothermal agent, and also as a reductant to allow the surface growth of MnO2via an in situ reduction of KMnO4. The MnO2 shell enabled a rapid and efficient adsorption of DZ, and more importantly, acted as a metal reservoir to release Mn2+ in response to intracellular stimuli for the in situ activation of DZ, which addressed the key limitation of DZ for biological applications, i.e., metal-dependent activity. As a result, HSP70 was remarkably suppressed for improved PTT efficacy upon laser irradiation, which was explicitly demonstrated both in vitro and in vivo. Upon intravenous injection, the nanosystem could effectively accumulate in the tumor, and impose potent PTT for complete tumor elimination via inducing tumor cell apoptosis, but without any noticeable toxicity. This work provides a promising nanosystem for enhanced PTT via silencing resistance-related genes, and offers ideas for the design of self-activated gene therapy platforms using DZ.
研究领域:
癌症治疗
·
纳米技术
·
生物医学工程
·
分子生物学
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PubMed
高影响因子
MOLECULAR PHARMACEUTICS
·
2026
·
IF 4.5
Hongyu Lin,Huwei Bian,Junyao Li,Laidi Xu,Tao Jiang,Yong Kong
To enhance the therapeutic efficacy of breast cancer, multimodal therapy with the aid of a pH-responsive controlled release platform is proposed in this work. Indocyanine green (ICG) is loaded in honeycomb MnO2 (hMnO2) synthesized by a template method, which is coencapsulated with 5-fluorouracil (5-FU) in the hydrogels cross-linked between carboxymethyl chitosan (CMCS) and oxidized hyaluronic acid (OHA). The imine linkage (−HC═N−) between CMCS and OHA is hydrolyzed under weakly acidic conditions, leading to the release of 5-FU for chemotherapy and ICG/hMnO2. The hMnO2 can convert the optical energy of near-infrared (NIR) light into heat for photothermal therapy (PTT). Additionally, the hMnO2 can be reduced to Mn2+ at low pH and high glutathione (GSH) level, and the produced Mn2+ can further react with H2O2 to generate hydroxyl radicals (·OH) through a Fenton-like reaction for chemodynamic therapy (CDT). ICG can be simultaneously released during the reduction of hMnO2, which can catalyze the conversion of oxygen to singlet oxygen (1O2) upon exposure to NIR light for photodynamic therapy (PDT). Due to the synergistic effects of chemotherapy, PTT, CDT, and PDT, the developed ICG/hMnO2/5-FU/CMCS/OHA hydrogels can significantly inhibit the growth of the 4T1 mouse breast cancer cell line.
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