CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Zhen Zhang,Jiang Wu,Bin Li,Huibin Xu,Dongjing Liu
Zeolite (ZSM-5), as a kind of carbon-free sorbent or catalyst, has been widely applied in many fields due to its big surface area, good chemical and thermal stability, and excellent adsorption performance. In this study, Mn-Fe modified ZSM-5 are synthesized via sol-gel approach and employed for elemental mercury (Hg 0 ) removal from simulated flue gas at low temperature. The results show that pure ZSM-5 shows poor mercury capture ability with Hg 0 removal efficiency of ~8.5–18.8% at 100–300 °C. Mn or Fe modification can both efficiently enhance the Hg 0 removal efficiency of the ZSM-5. The sorbent with Mn/Fe molar ratio of 1:2 exhibits the optimal mercury capture ability with the highest Hg 0 removal efficiency near 100% at temperatures of 200 and 250 °C due to the significant synergy effect between Mn 2 O 3 and Fe 2 O 3 . The presence of NO has a negligible effect on the Hg 0 removal performance of Mn/ZSM-5 and Mn1Fe2/ZSM-5, while the existence of SO 2 considerably degrades the Hg 0 capture performance of Mn/ZSM-5 owing to competing adsorption and side reactions. Fe addition can protect Mn active sites from SO 2 poisoning and thereby enhancing the SO 2 resistance of Mn/ZSM-5 to some extent.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2018
·Vol. 18
·期 4
·2993-2999
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IF 1.354
Liu Chun-Ling,Hou Chang-Jun,Huo Dan-Qun
In this work, a simple room-temperature phosphorescence (RTP) method was first proposed to detect adriamycin, by using a functional material of Mn doped ZnS quantum dots (Mn–ZnS QDs) composited with poly(diallyldimethylammonium chloride) (PDDA). After PDDA was associated to the
Mn–ZnS QDs, the RTP intensity was significantly enhanced. As a result, Mn–ZnS QDs/PDDA nanoassemblies greatly improve the adriamycin detection ability of QDs and provide an important method for developing more effective and sensitive adriamycin detection sensor. The method based
upon RTP has a linear range from 0.5 to 64.0 μM with a detection limit (3σ/s) for adriamycin of 0.45 μM. The developed method was further successfully applied to detect adriamycin in human serum samples (diluted 50 times) with satisfactory results, and
the recovery ranged from 98.3 to 101.3.
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高影响因子
Journal of Materials Chemistry B
·
2018
·Vol. 6
·期 21
·3586-3599
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IF 4.776
Xiaoqin Chen,Jing Sun,Huan Zhao,Ke Yang,Yuda Zhu,Hongrong Luo,Kui Yu,Hongsong Fan,Xingdong Zhang
For synchronous theranostic systems, there are two areas of focus. These are: excellent in vivo imaging and a multi-drug resistance (MDR) reversing ability for chemotherapy. Upconversion nanoparticles (UCNPs) exhibiting bright red emission in the “optical window in biological tissue (600–1100 nm)” could be a very useful candidate, although there have only been a few reports on UCNP-based conjugates with a MDR reversal ability explored for chemotherapy. Herein, we report an innovative theranostic system (D-UNT) via binding of an antitumor drug (DOX) and a MDR reversal agent (TPGS) to NaY(Mn)F4:Yb/Er UCNPs (UN) with synthetic optimized red emission and properties. The in vitro study demonstrated that the D-UNT was uptaken into drug-resistant MCF-7/ADR cells via caveolin dependent endocytosis and overcame P-gp mediated efflux. The cytotoxicity was significantly promoted to be much higher than that of free DOX. Accordingly, our D-UNT illustrates an enhanced reversal ability for chemotherapy. Our in vivo study further indicated that the D-UNT had excellent therapeutic efficacy against MDR tumors with minimal organ toxicity detected. In vivo deep-tissue imaging showed that the D-UNT accurately diagnosed MDR tumors at a 1.5 cm depth with high-contrast luminescent signals. Thus, the D-UNT is an effective theranostic system for the diagnosis and therapeutic treatment of MDR tumors. The present work opens new pathways to engineering powerful theranostic agents to simultaneously target, image and kill deep-tissue MDR tumor cells.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Hui Zhang,Xue-Tao Tian,Yue Shang,Yu-Hao Li,Xue-Bo Yin
Chemotherapy remains restricted by its toxic adverse effects and resistance to drugs. The treatment of nitric oxide (NO) combined with imaging-guided physical therapy is a promising alternative for clinical applications. Herein, we report nanoscale metal–organic framework (NMOF) systems to integrate magnetic resonance (MR) imaging, spatiotemporally controllable NO delivery, and photothermal therapy (PTT) as a new means of cancer theranostics. As a proof of concept, the NMOFs are prepared with biocompatible Zr4+ ions and Mn-porphyrin as a bridging ligand. By inserting paramagnetic Mn ions into porphyrin rings, Mn-porphyrin renders the NMOFs strong T1-weighted MR contrast capacity and high photothermal conversion for efficient PTT. S-Nitrosothiol (SNO) is conjugated to the surfaces of the NMOFs for heat-sensitive NO generation. Moreover, single near-infrared (NIR) light triggers the controllable NO release and PTT simultaneously for their efficient synergistic therapy with one-step operation. Upon intravenous injection, NMOF–SNO shows effective tumor accumulation as exposed by the MR images of the tumor-bearing mice. When exposed to the NIR laser, the tumors of mice injected with NMOF–SNO are completely inhibited, verifying the efficiency of NMOF–SNO. For the first time, Mn-porphyrin NMOFs are developed to be an effective theranostic system for MR imaging-guided controllable NO release and photothermal synergetic therapy under single NIR irradiation.
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Daming Chen,Song Yan,Haijun Chen,Lu Yao,Wei Wei,Hualin Lin,Sheng Han
Hierarchical Ni–Mn Layered Double Hydroxide (Ni–Mn LDH) nanosheets grow on a nitrogen-doped carbon foam skeleton through a one-step hydrothermal reaction . LNCF-2 exhibits high specific capacitance (2128.3 F g −1 at 0.5 A g −1 ) and good cyclic stability (94.3% retention after 5000 cycles at 2 A g −1 ) as an electrode material for supercapacitors . Furthermore, as a positive electrode material for an asymmetric supercapacitors (ASCs), it also has a high specific capacitance (125.1 F g −1 at 0.5 A g −1 ) and an excellent cyclic stability (80.1% retention after 10000 cycles at 5 A g −1 ). The increase in electrochemical performance is attributed to the high Faradaic pseudocapacitance of Ni-Mn LDH and the introduction of three-dimensional carbon foam. Because the introduction of three-dimensional carbon foam can provide an interconnection network for electron and ion transfer, allowing efficient charge exchange.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Huiming Li,Yang Wang,Wei Zhu,Zhongbin Zhuang
Searching for low-cost electrocatalysts with high activity towards the hydrogen evolution reaction (HER) is of great significance to enable large-scale hydrogen production via water electrolysis . In this study, by using inverse spinel MFe 2 O 4 (M = Mn, Fe, Co, Cu) nanoparticles (NPs) as the precursors, monodisperse bimetallic phosphide M-Fe-P NPs/C with hollow structures were readily obtained by a gas-solid annealing method. These hollow phosphide NPs displayed excellent HER activity in an acidic medium with a low loading amount of 0.2 mg cm −2 . In particular, the Co–Fe–P NPs/C shows highest HER activity that only requiring an overpotential of 97 mV to retain a current density of 10 mA cm −2 . A volcano relation between activity and incorporated elements was revealed. Incorporation of cation with high electronegativity stabilized the FeP active centres, while phase segregation resulted in the loss of activity for Cu–Fe–P NPs/C.
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Inorganic Chemistry Frontiers
·
2017
·Vol. 5
·期 3
·635-642
·
IF 4.036
Di Tian,Xiaofeng Lu,Guangdi Nie,Mu Gao,Ce Wang
Currently, the search for the fabrication of inexpensive and efficient binder-free electrodes for high performance supercapacitor applications is still a great challenge. In this work, different nanostructures of Ni–Mn oxide (Ni–Mn–O) are directly grown on the surface of flexible electrospun carbon nanofibers (ECNFs) and further used as binder-free electrodes for supercapacitors. Among three typical nanostructures, Ni–Mn–O nanosheets on ECNFs show superior electrochemical properties with a good specific capacitance (368.6 F g−1) and excellent rate properties (88.6% retention at 20 times initial current density) in a three-electrode system. Furthermore, an aqueous symmetry cell and a solid-state symmetry supercapacitor are assembled using two pieces of flexible ECNFs@Ni–Mn–O nanosheets. The maximum energy density and power density based on the solid-state supercapacitor are up to 20.4 W h kg−1 and 5.2 kW kg−1, respectively, indicating that the flexible ECNFs@Ni–Mn–O nanosheets present a fairly promising future for practical applications in the field of energy storage.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2017
·Vol. 17
·期 12
·8818-8826
·
IF 1.483
Liu Jingwei,Huo Minfeng,Zhu Yan
Mn–Na2WO4/SiO2 synthesized by Urea-assisted hydrothermal-Impregnation route has more and stronger surface basic sites, and more surface lattice oxygen, leading to higher methane conversion with higher selectivity toward ethane and ethylene in oxidative
coupling of methane reaction, compared to Mn–Na2WO4/SiO2 produced by Co-precipitation-Impregnation (CPI) and Sequential Impregnation (SI) methods.
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CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Baohuai Zhao,Rui Ran,Li Sun,Zesheng Yang,Xiaodong Wu,Duan Weng
A high-surface-area La-Ce-Mn mixed oxide was synthesized by citrate method, with further acid etching to dissolve the La 3 + ions in the lattice. The acid etching process efficiently improved the specific surface area, increased the ratios of Mn 4 + /Mn n + , Ce 3 + /Ce n + , O α /O tot , and enhanced the oxygen mobility of the catalyst, which were responsible for the superior catalytic performance. Compared to the pristine La 0.8 Ce 0.2 MnO 3 + δ catalyst, the etched one could convert CO and C 3 H 8 more efficiently, with 90% conversion of CO and C 3 H 8 at only 73 and 196 °C, respectively. Such superior catalytic performance made it possible to be used for automotive emission control during cold-start period.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jin Du,Hebin Liang,Yubin Zou,Bing Li,Xiao-yan Li,Lin Lin
The electroreduction of carbon dioxide (CO2) to high-value organic chemicals by the microbial electrosynthesis (MES) system relies heavily on the electrochemical properties of the electrode materials. In this work, CO2 reduction for acetate production was greatly boosted by decorating the carbon felt cathode using the Fe–Mn bimetallic oxides, using an enriched anaerobic mixed culture dominated by the homoacetogen Acetobacterium wieringae. In comparison with the unmodified carbon felt as the cathode in the MES reactor, modification with MnFe2O4 increased the acetate production rate from 28 to 78 g/(m2·d), higher than those with MnO at 59 g/(m2·d) and Fe2O3 at 62 g/(m2·d), and the relative abundance of A. wieringae increased dramatically from 51 to 87% in the biofilm. This was probably due to the mediated electron uptake via the redox cycles of Mn(III)/(II) and Fe(III)/(II), improved specific surface area, and enhanced hydrophilicity of the cathode, benefiting from the synergistic effect of Fe and Mn ions. Overall, this study provides a facile and promising electrode modification strategy for MES with Fe–Mn bimetallic oxides for efficient CO2 conversion and acetate production, bringing the world closer to achieving carbon neutrality.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Xiufeng Wang,Yunyun Zhang,Wenhui Ai,Yao Jin,Ge Chen,Zhiqing Zhang,Guodong Zhang,Ting Zhou,Fang Wang
A ratiometric fluorescence sensor based on Mn doped ZnS QDs was designed to detect ascorbic acid with highly selectivity . The synthesized Mn doped ZnS QDs showed a new luminescence performance due to new electron hole recombination center formed in the nanocrystals . The dopant-related luminescence of Mn 2+ appeared at 590 nm, and the best dopant-related luminescence effect can be obtained by changing the doping amount of Mn 2+ during the synthesis process. Ascorbic acid (AA) is known to be oxidized by Fe 3+ to generate dehydroascorbic acid (DHAA). If DHAA combined with o-phenylenediamine (OPD), a fluorescent product quinoxaline DFQ was obtained. Mixing DFQ with Mn doped ZnS QDs , two fluorescence emission appeared at 434 nm and 590 nm. After optimizing the concentration of Fe 3+ and OPD, solution pH and reaction time, the results showed a good linear relationship between AA and the ratio of F 434 /F 590 . The linear range of this ratiometric fluorescence sensor for detection of ascorbic acid were 0.5–40 μmol·L −1 and 40–80 μmol·L −1 , and the detection limit was low to 0.21 μmol·L −1 . Compared with the single fluorescence analysis method for AA detection, this work has stronger anti-interference and greatly improved sensitivity and selectivity by ratiometric fluorescence.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Haihua Wang,Futao Li,Chao Zhu,Chaoxian Chen,Ze Ding,Xiangping Chen
The rapid growth of the new energy market has led to a substantial increase in the demand for ternary lithium batteries, highlighting the importance of recycling their cathode materials to mitigate environmental risks and alleviate the limited supply of valuable metals. Traditional recycling methods for waste ternary lithium batteries are often inefficient and energy-intensive, particularly in recovering lithium. This study proposes a novel process for the separation and recovery of Li, Ni, Co, and Mn from simulated spent ternary lithium battery cathode materials. The process employs chromatographic separation and column operation techniques using amine-modified polyacrylonitrile fibers as adsorbents, which have selective adsorption capacity for Li with transition metals Ni, Co, and Mn. Experimental results demonstrated a lithium recovery rate of 99.4 % with 100 % purity under optimized conditions: solution pH of 2, feed solution concentration of 10 mmol/L, a fully packed adsorption column, and a feed flow rate of 0.29 mL/min. During the elution process, 0.2 mol/L nitric acid achieved effective desorption of the adsorbed metals. Furthermore, the intermetallic separation coefficients revealed significant separation efficiencies for Ni, Co, and Mn. This proposed method offers notable advantages in recovery efficiency, selectivity, and environmental sustainability, with particularly outstanding performance in lithium recovery, making it a promising strategy for recycling valuable metals from spent ternary lithium batteries.
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