ELECTROCHIMICA ACTA
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2016
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IF 4.803
Hongyan Chen,Yani Ai,Fan Liu,Xing Chang,Yuan Xue,Qi Huang,Chi Wang,Hualin Lin,Sheng Han
Hierarchical nanoarchitecture and composition can offer preponderances for enhancing pseudocapacitor performances. This paper reports on the three-dimensional hierarchical carbon-coated Ni–Mn layered double hydroxide on nickel foam (LNC) electrode material prepared via a facile two-step hydrothermal reaction. The resulting performance of the LNC composite material has high specific capacitance (1916 F g −1 ) and good cycling stability (91% retention after 5000 charge–discharge cycles). Moreover, the material can be directly used as an integrated flexible electrode with excellent rate capability (79.5% retention at 10 A g −1 ), which is significant in practical applications and large-scale syntheses. Furthermore, the LNC materials acting as a positive electrode for the asymmetric supercapacitor also exhibit high specific capacitance of 120.67 F g −1 at 0.5 A g −1 and excellent cycling stability with 84.2% capacitance retention after 5000 cycles at a current density of 5 A g −1 .
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FUEL PROCESSING TECHNOLOGY
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2016
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IF 3.847
Wei Li,Rui-tang Guo,Shu-xian Wang,Wei-guo Pan,Qi-lin Chen,Ming-yuan Li,Peng Sun,Shu-ming Liu
Heavy metals (such as Zn and Pb) have a deactivation effect on the catalyst for selective catalytic reduction of NO with NH 3 . In this study, it was found that the modification of Mn/TiO 2 catalyst by Nb could greatly enhance its Zn resistance. From the characterization results of BET, XRD, H 2 -TPR, NH 3 -TPD, it may be concluded that the introduction of Nb into Mn/TiO 2 catalyst would lead to its lower crystallinity , more acid sites and higher concentrations of Mn 4 + and surface chemisorbed oxygen. The results of in situ DRIFT study reveal that the NH 3 -SCR reactions over Mn/TiO 2 and Mn-Nb/TiO 2 all obey both the Langmuir-Hinshelwood mechanism and the Eley–Rideal mechanism, and the doping of Nb on Mn/TiO 2 catalyst could promote the adsorption of NH 3 and NOx species on it. All these features make a contribution to the high SCR activity and good Zn resistance of Mn-Nb/TiO 2 catalyst.
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MICROCHIMICA ACTA
·
2014
·Vol. 182
·期 1
·193-200
·
IF 3.719
Ren Xiaohui,Liu Haochi,Chen Ligang
We show that Mn(II)-doped ZnS quantum dots coated with an acrylamide-based molecularly imprinted polymer (MIP-coated QDs) can act as a fluorescent probe for the selective and sensitive detection of the insecticide chlorpyrifos (CPF). The fluorescence of the coated QDs is quenched on loading the MIP with CPF, and the effect is much stronger for the MIP than for the non-imprinted polymer. The MIP-coated QDs were characterized by fluorescence spectrophotometry, X-ray powder diffraction, and scanning electron microscopy. Under optimal conditions, the relative fluorescence intensity of the MIP-coated QDs decreases linearly with the increasing concentration of CPF in the 0.3–60 μmol L −1 concentration range, and the detection limit is 17 nmol L −1 . The method has been used for the determination of CPF in spiked water samples and gave recoveries in the range from 87.1 to 94.5 % with relative standard deviations in the 2.9 to 6.5 % range. The method is simple, safe and inexpensive.
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SENSORS AND ACTUATORS B-CHEMICAL
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2014
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IF 3.84
Yang Zhang,Jinchao Shen,Hong Yang,Yan Yang,Zhiguo Zhou,Shiping Yang
A magnetic sensor for Cd 2+ has been developed based on (Zn, Mn)-doped iron oxide nanoparticles [(Zn, Mn)Fe 3 O 4 NPs], which was modified by ethyl 1-(2-(3′,4′-dihydroxyphenyl)-2-oxoethyl)-1H-1,2,3-triazole-4-carboxylate (ETC). ETC provided the binding sites to Cd 2+ to induce the transformation of (Zn, Mn)Fe 3 O 4 NPs from a dispersed to an aggregated state with a corresponding increase in the transverse relaxation time ( T 2 ) of surrounding water protons. Owing to the special strong interaction between ETC and Cd 2+ , ETC coordinated (Zn, Mn)Fe 3 O 4 [(ETC-(Zn, Mn)Fe 3 O 4 )] NPs exhibited a low limit of detection of Cd 2+ of 3.5 nM and a high selectivity over other metal ions . Furthermore, ETC-(Zn, Mn)Fe 3 O 4 NPs can be used to detect Cd 2+ in living cells by magnetic resonance (MR) imaging.
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CHEMISTRY OF MATERIALS
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2013
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IF 8.238
Jun Xie,Changzhi Yan,Yu Zhang,Ning Gu
Monodisperse magnetic Mn–Zn ferrite nanostructures with various morphologies have been successfully synthesized via high-temperature decomposition of metal acetylacetonate (acac) in the presence of oleic acid (OA) and oleyamine (OAm). In a classical crystal nucleation/growth process, differential stabilization of OA on specific crystal facets may alter relative crystal growth rates, resulting in the formation of zero-dimensional (0-D) spherical, cubical, and starlike nanocrystals (ca. 9, 11, 16 nm), respectively. Furthermore, shortening nucleation duration might bring a deficient nucleation and a rapid increase in monomer concentration, which accelerates the subsequent growth process of nanocrystals, leading to the formation of the starlike nanocrystals with larger size (ca. 19–23 nm). They are further oriented to assemble reciprocally, gradually forming initial three-dimensional (3-D) “branched” nanoclusters (ca. 30–40 nm) to minimize the magnetostatic energy, owing to their size-dependent magnetic dipolar interaction. In addition, the surface-defect-induced secondary growth of the “branched” nanoclusters may considerably improve their uniformity, accompanied by the size increase in the presence of the monomers, resulting in the final “multibranched” nanoclusters with formation of sharp or obtuse edges (ca. 45–50 nm). Our study reveals the transformation of 0-D nanocrystals to 3-D nanoclusters as well as the shape evolution mechanism, which provide a versatile synthetic strategy for shape-controlled nanostructure. The multibranched nanoclusters have the higher magnetization and magnetically induced heating efficiency in an alternating current magnetic field, which can be used as promising heating agents for biomedical application.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2015
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IF 5.33
Bo Sun,Xiaohong Guan,Jingyun Fang,Paul G. Tratnyek
MnO4– was activated by HSO3–, resulting in a process that oxidizes organic contaminants at extraordinarily high rates. The permanganate/bisulfite (PM/BS) process oxidized phenol, ciprofloxacin, and methyl blue at pHini 5.0 with rates (kobs ≈ 60–150 s–1) that were 5–6 orders of magnitude faster than those measured for permanganate alone, and ∼5 to 7 orders of magnitude faster than conventional advanced oxidation processes for water treatment. Oxidation of phenol was fastest at pH 4.0, but still effective at pH 7.0, and only slightly slower when performed in tap water. A smaller, but still considerable (∼3 orders of magnitude) increase in oxidation rates of methyl blue was observed with MnO2 activated by HSO3– (MO/BS). The above results, time-resolved spectroscopy of manganese species under various conditions, stoichiometric analysis of pH changes, and the effect of pyrophosphate on UV absorbance spectra suggest that the reactive intermediate(s) responsible for the extremely rapid oxidation of organic contaminants in the PM/BS process involve manganese(III) species with minimal stabilization by complexation. The PM/BS process may lead to a new category of advanced oxidation technologies based on contaminant oxidation by reactive manganese(III) species, rather than hydroxyl and sulfate radicals.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhu-yu Li,Le-ran Li,Sheng Li,Ding-can Wang,Qi Niu,Kai Li,Ji Liu,Qiang Lu
Calcium-based thermochemical heat storage (TCHS) is an economical and environmentally friendly technology for efficient heat storage. It can strengthen the flexibility in power systems of renewable energy and promote the recovery and storage of waste heat in energy-intensive industries. However, CaO/CaCO 3 is extremely prone to sintering at operational temperatures. Consequently, a cost-effective approach was proposed to synthesize calcium-based TCHS materials modified by pyroligneous acid (PA) impregnation and co-doping with dual transition metals. The heat storage performance, physicochemical property, and anti-sintering mechanism of synthesized CaO were comparatively examined. The sample prepared with a molar ratio of Ca: Co: Mn = 100:3:7 (PACa-Co3Mn7) exhibited an initial energy storage density of 1.76 MJ/kg, which gradually rose to 1.88 MJ/kg. After 20 cycles, the value decreased by only 4.39 % from its peak, indicating outstanding TCHS performance. Characterization results indicated that the specific surface area and pore volume of PACa-Co3Mn7 were 10.48 m 2 /g and 0.035 cm 3 /g, which were 2.34 and 2.69 times those of CaO stemmed from the calcination of limestone, respectively. The fruitful pores provided pathways for CO 2 diffusion within the CaO particles or CaCO 3 product layer. The uniformly distributed Co and Mn elements combined to form Ca 3 CoMnO 6 . Ca 3 CoMnO 6 could serve as the inert carrier that mitigated the grain-growth of CaO, thereby stabilizing the pore structure and resisting the sintering of PACa-Co3Mn7. Furthermore, density functional theory (DFT) calculations demonstrated that the free Mn and Co elements efficiently promoted the electrons transfer between CaO and CO 2 , which improved the reactivity of PACa-Co3Mn7. Therefore, CaO modified by PA impregnation and co-doping with dual transition metal is a promising candidate for the TCHS system.
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Reaction Chemistry & Engineering
·
2024
·
IF 3.4
Shan Huang,Jiajia Liu,Lingxin Kong,Mengmeng Wang,Yi Liu,Yi Fang,Qi Xiao
This study reports the synthesis of Er-doped, Mn-doped, and Er, Mn co-doped monoclinic BiVO4 photocatalysts via a facile one-pot hydrothermal method. Er6%Mn2%/BiVO4 exhibited a larger specific surface area, bigger pore volume, and smaller average pore size compared to pure BiVO4 and single-doped BiVO4. The co-doping of Er3+ and Mn2+ ions resulted in lattice distortion and crystal particle size reduction of BiVO4, and generated a new impurity level at the bottom of the conduction band, narrowing the band gap and widening the absorption edge of visible light, thus improving the separation efficiency of photogenerated electron–hole pairs. Photocatalytic experiments on rhodamine B showed that Er6%Mn2%/BiVO4 achieved a degradation efficiency of 97.8% under visible light irradiation (λ >420 nm) within 100 min, which is higher than those of BiVO4, Er6%/BiVO4, and Mn6%/BiVO4. The kinetic rate constant (0.0312 min−1) of Er6%Mn2%/BiVO4 was 1.3, 2.2, and 4.7 times higher than those of Er6%/BiVO4, Mn6%/BiVO4, and BiVO4, respectively. The study also identified ·O2− and h+ as the predominant active species involved in the photocatalytic degradation of rhodamine B and demonstrated the excellent stability of Er6%Mn2%/BiVO4 for five cycles of photodegradation experiment. This work highlights that Er6%Mn2%/BiVO4 has great potential as a candidate for treating organic pollutants in water.
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JOURNAL OF MOLECULAR STRUCTURE
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2025
·
IF 4.7
Zhijiang Rong,Wei Guo,Haotian Liang,Huan Lv,Hua Guo,Yi Zhang,Bo Zhang,Chunyan Hao,Xianjun Liu,Hongyan Sun,Yifan Gao
Biological metal ions play crucial roles in various life processes and exhibit diverse biological functions. Specifically, Ca(II), Mg(II), Cu(II), and Mn (II) ions are intricately involved in insulin function. To further clarify the biological functions of biological metal ions on insulin, the interaction mechanism of insulin affected by Ca(II), Mg(II), Cu(II), and Mn (II) ions were comparably investigated via spectroscopic, circular dichroism(CD), and electrochemical approaches. Electrochemical studies demonstrate that Mn(II) forms an M 2 L-type complex with insulin, exhibiting a binding constant of β Mn = 9.3 × 10 9 , while Cu(II) and insulin form an M 4 L-type complex with a significantly higher binding constant of β Cu =9.18 × 10 12 . Electrochemical investigation of the interaction between Ca(II) and Mg(II) with insulin adsorbed onto a glass carbon electrode surface revealed that the presence of Ca(II) and Mg(II) induced conformational changes in insulin, resulting in reduced adsorption capacity. Additionally, it was observed that the presence of Ca(II) and Mg(II) enhanced the redox signal of probe ions. The binding constants values were calculated to be 1.108 × 10 3 L•mol –1 for the insulin-Ca(II) system and 2.28 ×10 2 L• mol –1 for the insulin-Mg(II) system. Spectroscopic studies showed that the binding of Cu(II) ions to insulin molecules may be controlled by chelation mechanism, and the interaction between Cu(II) ions and insulin molecules may occur in the aromatic region. Mn(II) ion binding is mainly controlled by ionic interactions, and its binding site is far away from the aromatic region.The combination of Ca(II) and Mg(II) with insulin induced a small enhancement in the Ultraviolet-visible (UV) absorption peak, with Ca(II) exhibiting a more pronounced effect compared to Mg(II). The results of spectral, CD and electrochemical studies are consistent.
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FUEL
·
2024
·
IF 6.7
Lan Xiao,Jian Wen,Guanghui Wu,Pinghua Chen,Mengxue Wang,Hualin Jiang,Xinming Zhou,Jianan Yan
Rational design of efficient and low-cost oxygen evolution reaction (OER) electrocatalysts is a key challenge in the development of various clean energy technologies. Here, flower-shaped FeCo-MOF-74/Mn-MOF-74 (FeCo/Mn mass ratio x:y, denoted as FCMx-y) electrocatalysts were synthesized through a two-step simple solvothermal methods and applied to the OER. These synthesized OER catalysts exhibited effective synergistic effects, high conductivity, electrochemical active surface area, carrier density, enhancing the intrinsic activity of MOF-74. Among them, the optimized FeCo-MOF-74/Mn-MOF-74 (named FCM1-2) required only a low overpotential of 280/382 mV to achieve 10/300 mA cm −2 in 1 mol/L KOH, outperforming control samples and commercial IrO 2 . Furthermore, the catalyst demonstrated high electrocatalytic activity, rapid catalytic kinetics, and excellent stability. This research provides a reference for the industrial design of advanced OER electrocatalysts with high current density for sustainable energy technologies.
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International Journal of Nanomedicine
·
2024
·
IF 6.6
Dong Zhang,Mogen Zhang,Huiping Fan,Rui Sun,Jiayun Liu,Weiyuan Ma
Background Melanoma is an aggressive skin tumor with limited therapeutic options due to rapid proliferation, early metastasis, and poor prognosis. Baicalin (BA), a natural flavonoid, shows promise in inducing ferroptosis and apoptosis but faces challenges of poor solubility and bioavailability. To address these issues, we developed a multifunctional drug delivery system: manganese-doped ZIF-8 nanoparticles (ZIF(Mn)) loaded with BA and modified with folic acid (FA) and polyethylene glycol (PEG). FA targets melanoma cells by exploiting folate receptor overexpression, while PEG enhances biocompatibility and systemic circulation. Manganese enables magnetic resonance (MR) imaging for real-time, non-invasive therapy monitoring.Methods BA-loaded ZIF(Mn)/FA-PEG nanoparticles were synthesized via a one-pot method, enabling drug encapsulation, Mn²+ incorporation, and surface modification. The nanoparticles were comprehensively characterized (particle size, Zeta potential, FTIR, and XRD). Cytotoxicity and cellular uptake were evaluated in B16-F10 melanoma cells, and in vivo experiments in C57BL/6J mice investigated MR imaging capability, antitumor efficacy, and biosafety.Results BA@ZIF(Mn)/FA-PEG nanoparticles demonstrated excellent stability, a BA loading capacity of 33.50 ± 0.04%, and pH-responsive release, with accelerated drug release under acidic tumor conditions. Mn²+ provided strong T1-weighted MR imaging contrast. Cellular and animal studies showed enhanced uptake, reduced premature drug release, and improved compatibility. Mechanistically, the nanoparticles induced significant ferroptosis and apoptosis in melanoma cells, leading to potent antitumor effects.Conclusion The BA@ZIF(Mn)/FA-PEG nanoplatform effectively integrates targeted delivery, imaging guidance, and dual ferroptosis-apoptosis induction, offering a promising strategy for improving melanoma treatment outcomes.
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CHEMOSPHERE
·
2024
·
IF 8.1
Xinyue Feng,Haolin Shi,Wei Liu,Fangwei Ma,Pan Liu,Jiafeng Wan
This study demonstrated the design and fabrication of flower-like Ni/Mn-MOFs materials, and three-dimensional ultrathin flower-like Ni/Mn/MC microspheres were fabricated by embedding metal or metal oxide nanoparticles into a porous carbon skeleton via high-temperature pyrolysis at 600 °C and used for the electrocatalytic degradation of ceftriaxone sodium. This unique ultrathin porous flower-like structure can expose more active sites, provide rapid ion/electron transfer, and improve electrocatalytic activity. Meanwhile, the excellent electrical conductivity of the carbon skeleton, as well as the rational composition and synergistic effect of the two components, can promote the generation of active radicals (•OH and •O 2 − ) in the reaction system, which accelerates the electrochemical degradation process and improves the electrocatalytic degradation performance. The results showed that the Ni/Mn/MC-5:1 composite prepared when the molar ratio of Ni: Mn was 5:1 exhibited the best electrocatalytic degradation performance for the degradation of sodium ceftriaxone. The composites showed 98.2% degradation of ceftriaxone sodium in 120 min and maintained sound degradation after 20 cycles. Therefore, we concluded that this novel multicomponent composite has good electrocatalytic activity and stability for the degradation of antibiotic wastewater.
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