ACS Applied Nano Materials
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2023
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IF 5.9
Weicai Wang,Youcheng Yang,Xiaozu Chen,Tingting Zhao,Xuemei Li
Photodynamic therapy (PDT) has limitations for deep tumors that cannot be reached by an external excitation light source, and it is a feasible strategy to use chemical energy instead of an external laser to excite the photosensitizer. Herein, biodegradable self-supplying cascade reactors with hollow mesoporous manganese dioxide (HMnO2) nanospheres as carriers were developed, which could improve the hypoxia characteristics of the tumor microenvironment (TME) for synergistic starvation therapy and chemiexcited PDT. The chemiluminescent substrate bis[2,4,5-trichloro-6-(pentyloxycarbonyl)phenyl] oxalate (CPPO) made the generation of reactive oxygen species (ROS) no longer rely on external light sources. Glucose oxidase (GOx) catalyzed glucose to produce a large amount of hydrogen peroxide (H2O2), which not only promoted the decomposition of the manganese dioxide shell to release the drugs but also produced oxygen (O2) to improve the tumor microenvironment and also stimulated the activation of CPPO for promoting the photosensitizer chlorin e6 (Ce6) to convert O2 into singlet oxygen (1O2), leading to the death of cancer cells. This cascade nanoreactor had a hydrodynamic diameter of approximately 140 nm, which greatly simplified the synthesis steps of nanoparticles and utilized the cascade reaction to maximize the efficacy of cancer treatment. Therefore, the self-supplying cascade strategy will provide a feasible and efficient way for cancer therapy in the future.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Hao Chen,Jingdong Guo,Shandong Tan,Xueqi Zhang,Zhiyuan Sang,De'an Yang
MnO 2 has outstanding potential for application in cathode materials of zinc ion batteries (ZIBs). However, the poor electrical conductivity , poor ion diffusion kinetics, and structural instability greatly limit its rate performance, specific capacity, and cycling stability. Herein, we prepared PEDOT-coated MnO 2 cathode material with oxygen vacancy defects, namely Vö-MnO 2 @PEDOT, by Dual-modification of MnO 2 nanowires. The PEDOT coating optimizes the electron transfer capability of the material while inhibiting the dissolution of MnO 2 . The oxygen vacancies accelerate ion diffusion. Vö-MnO 2 @PEDOT possesses a joint energy storage mechanism, containing the insertion/extraction of H + /Zn 2+ and dissolution/precipitation of MnO 2 . This joint energy storage mechanism explains the high specific capacity and the increase in capacity. The Vö-MnO 2 @PEDOT displays a high specific capacity of 400 mAh/g at 0.2 A/g. Besides, at 2 A/g, Vö-MnO 2 @PEDOT outputs a high capacity of 213 mAh/g after 2000 cycles. This research provides a feasible research idea for the performance optimization of manganese oxide cathode materials.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jiale Wu,Jin Hu,Zhongshan Deng,Yongjin Feng,Hongtao Fan,Zhiyi Wang,Kaijun Wang,Qingming Chen,Weijun Zhang
B 2 O 3 -MnO 2 -CdO ternary oxide glasses with amorphous properties were synthesised using the melt-quenching method. Structural and physical property analyses showed that the amount of non-bridging oxygen and the system stiffness increases, and the oxide network filling is more tightly packed as cadmium oxide (CdO) gradually replaces manganese Oxide (MnO 2 ) in the glass. The radiation-shielding performance of the B 2 O 3 -MnO 2 -CdO glasses was evaluated using the shielding parameters calculated by the MCNPX simulation and the Phy-X program. Glasses with 40% and 50% CdO loading exhibited an average specific lead equivalent (PbE) of 0.241 and 0.294 mmPb/mm in the medical X-ray diagnostic area at 0.03–0.08 MeV; thus, they could fully meet the specific PbE requirements for application as "protection devices against diagnostic medical X-radiation". Furthermore, their photon attenuation capability is superior to that of various commercial shielding glasses in fast-neutron nuclear applications at 1°–10 3 MeV. In addition, compared to the borate glass systems studied in the literature, B 2 O 3 -MnO 2 -CdO glasses have fast neutron removal cross-sections of 0.125 cm −1 at a smaller density of 3.9043–4.8135 g/cm 3 , making them potentially excellent fast neutron absorbers.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
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IF 8.4
Mingcong Rong,Yi Huang,Xiaoting Zhuang,Yingming Ma,Haijiao Xie,Yanfang Wu,Li Niu
Tetracyclines (TCs) are the most common antibiotic drugs in the world. However, due to the overuse and difficulty of degradation, TCs pollution is becoming a global threat to aquatic and terrestrial biodiversity. Current methods for detecting TCs mainly rely on fluorescent probes or nanomaterials with enzyme-mimicking catalytic activities , which only provide a single signaling mode and are vulnerable to experimental factors. Herein, this study reports the development of an AND logic-gate-based sensing platform for TCs with fluorescent and colorimetric dual-signal readouts using Au@MnO 2 nanoparticles that could be mutually verified for the selective sensing of TCs. It was found that Au@MnO 2 nanoparticles could oxidize TC into its oxidation state (oxTC), resulting in significant green fluorescence emission . Meanwhile, the MnO 2 shell was etched away, and the released Au core nanoparticles gradually aggregated, with a color change from brown to light blue. As such, we established the fluorescence “turn-on” and colorimetric quantitative relationships towards TC with detection limits of 21.9 and 83.3 nM, respectively. Furthermore, Au@MnO 2 -based analytical paper devices were prepared and demonstrated successfully for the fluorescent and colorimetric dual-signal readout detection of TC in real samples. This paper sheds light on the on-site detection of tetracycline using paper-based analytical devices and smartphones.
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ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Minzhi Du,Kun Zhang
Transition-metal-oxide-based electrochemical electrodes usually suffer from poor electron and ion transport, leading to deteriorated rate performance and cycling stability. Herein, we address these issues by developing a facile “conducting encapsulation” strategy toward a nanoporous PEDOT nanowire/MnO2 nanoparticle/PEDOT nanowire composite electrode. Through encapsulation of the PEDOT nanowire network, the overall electrochemical performance of the resultant composite electrode is substantially enhanced. Specifically, the rate capability and capacitance retention are improved by ∼48.2 and ∼33%, respectively, which are 89.8% at 0.8–40 mA/cm2 and 93% after 3000 charge/discharge cycles at 2.0 mA/cm2, respectively. Moreover, the specific capacitance is increased by ∼6 times of that of the MnO2@PEDOT NW electrode at ∼200 mA/cm2. We find that a nanoporous conducting nanowire network that encapsulates a MnO2 nanoparticle layer can provide efficient electron and ion transport paths and stabilize the structure of MnO2 from collapse during charge/discharge cycling and mechanical deformation. This strategy can be applied to other pseudocapacitive material-based electrochemical electrodes, such as transition-metal oxides and conducting polymers.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
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IF 15.1
Minjia Meng,Yi Li,Hui Peng,Binrong Li,Chuanxun Zhang,Jiajia Ren,Qingluola Ren,Yan Liu,Jianming Pan
The selective separation and purification of ART and ARE using molecularly imprinted membrane (MIM) has attracted considerable attention, but most of conventional blending MIM face low adsorption capacity and poor selectivity due to the blockage of imprinting sites. Herein, an alternative ART imprinted MnO 2 nanowires “coating” membrane (MINM) with hydrophilicity was fabricated by vacuum filtration of imprinted MnO 2 nanowires and graphene oxide nanosheets on PVDF membrane surface for selective ART separation. For the MINM, the imprinted MnO 2 nanowires coating offers more available exposed imprinting sites on the MINM surface compared to that of the blending MIM, while the introduction of graphene oxide improves the hydrophilicity of MINM, significantly reducing the non-specific absorption. Consequently, the MINM exhibits ultrahigh ART adsorption capacity and selectivity, with the ART adsorption amount of 335 mg g −1 at 5 min using dynamic cross-flow separation system, about 12.18 times higher than that of ARE (27.5 mg g −1 ), and the separation factor ( a ) value of 12.39. Moreover, the ATR FT-IR dynamic spectrum discloses the in-situ formation of H-bond between ART and MINM, playing a key role in the selective adsorption process. This work provides an alternative strategy to prepare “coating” MIM for high-efficient and selective separation of complex analogue systems.
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高影响因子
DALTON TRANSACTIONS
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2022
·Vol. 52
·期 4
·1009-1020
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IF 4.569
Min Pan,Ning Wang,Zhenting Weng,Xuehua Zou,Xiaoming Huang
A heterogeneous Fenton-like system comprising palygorskite/MnO2/Fe3O4 (PMM) as a superior, low-cost, and eco-friendly ternary catalyst for the activation of peroxymonosulfate (PMS) was investigated with regard to its ability to degrade Acid Scarlet GR in an aqueous solution. Under the optimum catalytic oxidation conditions of 1 g L−1 PMM, 0.7 g L−1 PMS, and an initial pH value of 5, 200 mg L−1 Acid Scarlet GR was completely degraded within 300 min. PMM exhibited outstanding magnetic recovery ability and reusability after nine cycles with a degradation efficiency of up to 95.4%. The PMM catalyst had a broad working pH range. Singlet oxygen 1O2 was considered to play the principal role in the degradation of Acid Scarlet GR in the PMM/PMS system. The synergistic effect between MnO2, Fe3O4, and PG substantially accelerated the catalytic activity of PMM, and MnO2 was identified to be the primary active site. These findings indicate that PMM is a nanocatalyst that can efficiently activate PMS for the treatment of dye-containing wastewater.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
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IF 3.806
Jiwei Xie,Guijing Liu,Xueming Li,Ziqi Liu,Jia Sun,Shanmin Gao
Aqueous zinc-ion batteries (ZIBs) have gained significant interest as a future replacement for Li-ion batteries, mainly since the materials and assembly techniques used in ZIBs are safe and in line with the development of green chemistry. We have designed a cathode material with excellent cycling stability for ZIBs and prepared MnO 2 /CNTs@C nanocomposites by the hydrothermal method . The two‑carbon strategy's synergistic effect improves manganese-based materials' structural stability. The electrode provided an initial discharge capacity of 305 mAh·g −1 and still provided 160.4 mAh·g −1 after 6000 cycles at a current density of 2 A·g −1 , with a stable capacity retention of 91.4 %. Ex-situ XRD and XPS results successfully confirmed that the continuous Zn 2+ and H + intercalation reactions occurred in ZIBs. The superior stability of MnO 2 /CNTs@C electrodes provides a new approach for the wide application of aqueous ZIBs in daily life in the future.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhao Wang,Yurou Wang,Yuxuan Lin,Gang Bian,Hai-Yang Liu,Xiang Li,Jun Yin,Jian Zhu
Aqueous zinc-ion batteries (ZIBs) have gained wide attention for their low cost, high safety, and environmental friendliness in recent years. β-MnO2, a potential cathode material for ZIBs, has been restricted by its small channels for efficient charge storage. Herein, β-MnO2 nanorods with oxygen vacancies are fabricated by a K+-doping strategy to improve the performance of ZIBs. The assembled batteries exhibit a capacity of 468 mAh g–1, a power density of 2605 W kg–1, and an energy density of 179 Wh kg–1, which outperforms most reported ZIBs. Such a performance is owing to the synergistic combination of the oxygen vacancies in β-MnO2 and concurrent deposition of ε-MnO2 from Mn2+ in the electrolyte. Furthermore, superior cycling stability with negligible capacity decay in these batteries is demonstrated over 1000 cycles at a high current of 2 A g–1. This study reveals the importance of oxygen vacancies and Mn2+ deposition effect in understanding the mechanism of charge storage in MnO2-based ZIBs.
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高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Fangning Liu,Zhe Li,Ge Kang,Zhai Liu,Shicheng Zhu,Ruxue He,Chenghui Zhang,Chuanxia Chen,Yizhong Lu
Determination of α-glucosidase (α-Glu) activity and screening its inhibitors have great significance in disease diagnosis and biomedical research. In contrast to the flourishing development in fluorescent α-Glu assays, very few fluorescent ratiometric methods have been designed, especially the simplified one with two in-situ formed fluorescent signals derived from the same precursor. In this work, we have demonstrated that bovine serum albumin (BSA) templated MnO 2 nanosheets (NSs) are robust oxidase mimics and oxidants that can switch o -phenylenediamine (OPD)-based fluorescent reactions in presence of ascorbic acid (AA). MnO 2 NSs exert oxidase-like effects to simulate the oxidation of non-fluorescent OPD to orange fluorescent 2,3-diaminophenol (DAP) with fluorescence emission at 565 nm. In the presence of AA, MnO 2 NSs as oxidants can effectively promote the dehydrogenation of AA and thus facilitate the fluorescent reaction between AA and OPD to generates fluorescent probe with emission at 425 nm. At the same time, generation of DAP is hindered due to OPD consuming and MnO 2 NSs decomposition. AA-induced reversed fluorescence response at 425 and 565 nm lays the foundation for fluorescent ratiometric detection of α-Glu by using 2-O-α- d -glucopyranose- l -ascorbic acid (AAG) as substrate. This α-Glu assay features with the merits of strong anti-interference ability, easy operation and time-saving, and can be further used for inhibitor screening and inhibition efficiency evaluation.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Haiping Zhao,Ziyi Zhang,Yong Han,Weixia Yang,Wenzhi Tang,Tianli Yue,Zhonghong Li
A nanocomposite (UiO-66/Ce-MnO 2 ) was fabricated by combining UiO-66 with cerium-doped manganese dioxide (Ce-MnO 2 ) for colorimetric detecting vitamin C (Vc). Compared with traditional artificial enzymes, the as-synthesized UiO-66/Ce-MnO 2 were simple to prepare and did not require the participation of other active substances. The doping of cerium increased the oxygen vacancies and the UiO-66 as a carrier improved the dispersibility. The formation of superoxide anion (O 2 − ) and the inside Ce 4+ /Ce 3+ and Mn 4+ /Mn 3+ redox couples of UiO-66/Ce-MnO 2 endowed UiO-66/Ce-MnO 2 with a high catalytic capability, which could catalytically oxidize 3, 3′, 5, 5′-tetramethylbenzidine (TMB) into oxidation state TMB (oxTMB) without H 2 O 2 , accompanying with color change and a prominent peak at 652 nm in UV–vis spectra. Based on the inhibitory effects of Vc on catalytic oxidation of TMB, detection of Vc can be achieved, exhibiting a linear relationship in the concentration of 1.13–17.01 μmol L −1 with a low detection limit of 65.82 nmol L −1 . This system can also be detected by smartphone, the linear detection range is 12.47–22.67 μmol L −1 . Vc contents in fruits and vegetables detected by the sensor were in good agreement with the 2, 4-Dinitrophenylhydrazine colorimetry method ( P > 0.05), indicating a reliable sensor for Vc detection.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiafei Su,Qinfei Ke,He Xu
Catalytic oxidation of toluene by employing manganese dioxide (MnO 2 ) as catalysts has shown great potential, however, the huge energy demands during the MnO 2 catalytic process limits its application. Herein, a new type of MnO 2 /SiO 2 nanocomposites with outstanding solar light-driven photo-thermo catalysis activity was successfully fabricated. The MnO 2 nanoparticles in homogeneous dispersion state were decorated on the surface of SiO 2 nanofiber. The abundant hydroxyl groups on the surface of SiO 2 nanofiber facilitated toluene enrichment. Moreover, abundant oxygen vacancies were generated through the substitution between the Mn 4+ and Si 4+ , which improved the concentration and mobility of active oxygen. An excellent photo-thermo catalytic activity of MnO 2 /SiO 2 nanocomposites on toluene degradation was observed with a significant CO 2 yield (100 %) and high value of CO 2 production rate under simulated sunlight, which was much superior to that of P25 and MnO 2 powders. The mechanism of the enhanced catalytic performance of MnO 2 /SiO 2 nanocomposite is ascribed to the synergism of photo-activation and solar light-driven thermo-catalytic oxidation. This work demonstrates a new route to develop MnO 2 -based photo-thermo catalyst and provides an energy-saving way for toluene removal on overall utilization of solar energy.
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