INORGANICA CHIMICA ACTA
·
2023
·
IF 2.8
Qiang Zhao,Qi-Yang Li,Zhi Shen,Guo Zang,Wen-Jun Lv
In order to further enrich the research on the synthesis of complexes with terpyridine ligand and transition metals, in this work, 4′-(4-(1H-imidazol-1-yl)phenyl)-2,2′:6′,2′'-terpyridine (Iptpd), 1,2-benzenedicarboxylic acid (1,2-BA) were used to construct metal complexes with Cd 2+ , Zn 2+ , Mn 2+ and Co 2+ by solvothermal reaction, and five complexes were constructed, namely, [Cd(Iptpd)(NO 3 ) 2 ] n ( 1 ), [Mn(Iptpd)(NO 3 ) 2 ] n ( 2 ), [Zn(Iptpd) (NO 3 ) 2 ·2H 2 O] n ( 3 ), [Mn(Iptpd)(1,2-BA)] 2 ( 4 ) and [Co 3 (Iptpd) 2 (1,2-BA) 2 (NO 3 ) 2 ·10H 2 O] n ( 5 ); Single crystal x-ray diffraction analyses reveal that complexes 1, 2, 3 and 5 have one-dimensional chain structure, 4 is a binuclear structure. In addition, Luminescence behavior of complexes 1 and 3 , magnetic properties of complexes 2 and 4 were investigated. The fluorescent test result shows that complex 1 and 3 have weak fluorescence performance and the fluorescence intensity is lower than that of ligand; The magnetic results indicate that complex 2 has ferromagentic property and 4 has antiferromagentic property.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zehui Wang,Daijie Deng,Huan Wang,Suqin Wu,Linhua Zhu,Li Xu,Henan Li
Nitrogen-coordinated manganese atoms on carbon materials denoted as Mn N C, serve as the highly active non-precious metal electrocatalysts for oxygen reduction reaction (ORR) in zinc-air batteries (ZABs). Nonetheless, a significant challenge arises from the tendency of Mn atoms to aggregate during heat treatment, thereby compromising ORR performance in ZABs. In this work, the molecular assembly strategy based on the hydrogen bond interaction was employed to fabricate the Mn N C electrocatalyst . This approach promotes the dispersion of Mn atoms, creating abundant Mn–N x active sites. Furthermore, the resulting three-dimensional porous nanostructure, formed by molecular assembly, significantly enhances accessibility to the Mn–N x active sites. The porous nanostructure not only shortens the diffusion path of reactants and charges but also improves mass transfer. The Mn N C exhibits impressive ORR catalytic performance with a half-wave potential of 0.90 V (vs. RHE). The liquid-type ZAB based on Mn N C displays a high specific capacity of 816.6 mAh/g and an extended charge–discharge cycle life of 1000 h. Quasi-solid-state ZAB based on Mn N C can operate stably for 24 h. This work presents an effective strategy to synthesize transition metal-nitrogen-carbon (M N C) electrocatalysts tailored for long-life zinc-air battery.
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MOLECULES
·
2023
·Vol. 28
·期 19
·6843
·
IF 4.6
Fumei Shi,Yilan Chen,Chuanheng Dong,Jiajia Wang,Chunman Song,Yalin Zhang,Zhen Li,Xianqiang Huang
Polyoxometalates (POMs) exhibit unique structural characteristics and excellent physical and chemical properties, which have attracted significant attention from scholars in the fields of anticancer research and chemotherapy. Herein, we successfully synthesized and structurally characterized two novel polyoxovanadates (POVs), denoted as POVs-1and POVs-2, where [M(1-vIM)4]2[VV4O12]·H2O (M: NiIIand MnII, 1-vinylimidazole abbreviated as 1-vIM) serve as ligands. The two POVs are isomeric and consist of fundamental structural units, each comprising one [V4O12]4−cluster, two [M(1-vIM)4]2+cations, and one water molecule. Subsequently, we evaluated the cell viability of human hepatocellular carcinoma (HepG-2) cells treated with the synthesized POVs using the MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazoliumbromide) assay. And the changes in cell nucleus morphology, mitochondrial membrane potential (Δψm), and reactive oxygen species levels in HepG-2 exposed to POVs were monitored using specific fluorescent staining techniques. Both hybrid POVs showed potent inhibitory activities, induing apoptosis in HepG-2 cells along with significant mitochondria dysfunction and a burst of reactive oxygen species. Notably, the inhibitory effects of POVs-2were more pronounced than those of POVs-1, which is primarily attributed to the different transition metal ions present. These findings underscore the intricate relationship between the metal components, structural characteristics, and the observed antitumor activities in HepG-2 cells.Keywords:polyoxovanadates;imidazole ligands;human hepatocellular carcinomas;anticancer;apoptosis
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 43
·19974-19982
·
IF 3.3
Hao Fan,Qin Peng,Zhenxing Shen,Xuefeng He,Yiming Yang
Nitric oxide (NO), a major atmospheric pollutant and a precursor to haze, can be removed using the denitration catalyst. Mn and Ni are commonly used as denitration catalyst additives owing to their adsorption abilities for NO and ammonia (NH3). In this study, we synthesized Mn- and Ni-loaded Pt-modified sulfated cerium oxide (PtSCe) catalysts using an impregnation method and explored the effects of these elements. The results revealed that the two elements had contrasting effects on the denitration activity of the catalysts. Mn improved the water vapor and sulfur resistance of the PtSCe sample by increasing the concentration of weak acid sites, enhancing the redox ability, and increasing the content of surface-adsorbed oxygen. The elevation in oxygen vacancies, stimulated by the presence of Ce3+ and Mn3+, swiftly replenished the reactive oxygen species, thereby sustaining the high denitration efficiency of the MnPt/SCe sample. Active sites on the catalyst surface included NH3 adsorbed on Lewis acid sites, NH4+, and –NH2, along with bridging, monodentate, and bidentate nitrate groups. Regarding the catalyst reaction mechanism, we determined that the selective catalyst reduction of NH3-SCR over MnPt/SCe followed both the Eley–Rideal and Langmuir–Hinshelwood mechanisms. These findings offer crucial insights into the intricate relationship between metals, sulfates, and carrier molecules, thus providing implications for future catalyst design.
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Progress in Natural Science-Materials International
·
2023
·
IF 4.7
Huiling Zhu,Kai Wang,Yao Qi,Ruixin Li,Jianxu Ding,Rui Liu
In this study, we synthesized a bayberry-like Ni–Co–Mn ternary hydroxide with a secondary nanoneedle structure using a modified and cost-effective hydrothermal process assisted by the surfactant cetyltrimethylammonium bromide (CTAB). The incorporation of CTAB and graphene in the preparation process significantly enhances the electrochemical performance of NiCoMn–OH. The achieved results are truly impressive, with a high specific capacity of 1450 F g −1 and an outstanding capacity retention of 52.57% over 5000 cycles. The superior performance could be attributed to the specific bayberry-like microstructure with high effective specific surface area, which allowed for facile and rapid transport of ions and electrons. Moreover, the synergistic effect of CTAB and graphene proved to be crucial in stabilizing the Co 2+ and Mn 2+ ions within the ternary hydroxide structure. We developed a hybrid capacitor using a NiCoMn–OH-CTAB/Graphene composite electrode and an active electrode, which delivered a superior energy density of 50.79 Wh kg −1 at a power density of 400 W kg −1 and a cycling stability of 60.37% after 10000 cycles. These results indicate that the NiCoMn–OH-CTAB/Graphene composite electrode has great potential as an electrode material for energy storage devices.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jing Li,Xiyu He,Yunzhu Du,Min Jiang,Qiaodan Hu,Jiewei Yin,Fan Yang,Junliang Zhang
Co/Mn-based spinel oxides are promising electrocatalysts for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), however, it is challenging to achieve high activities for ORR and OER simultaneously in one composition. Here, we report Co 2 MnO 4 (C2M) with Mn-rich surfaces and abundant twin defects synthesized by a simple coprecipitation and annealing route, which exhibits excellent ORR activity (half-wave potential E 1/2 = 0.830 V), long ORR durability (91% current retained after 12 h-chronoamperometry test at 0.45 V vs. RHE) and a low Δ E = 0.767 V between E 1/2 and E 10 mA/cm 2 in alkaline electrolyte, which enables its excellent performances in rechargeable Zn-air batteries showing a high peak energy density of 136 mW/cm 2 and a large specific capacity of 809.4 mAh/g Zn . Combining comprehensive experimental investigations and DFT simulations, we reveal that the Mn-rich surfaces benefit bridge adsorption of O 2 to promote the 4-electron reaction pathway in ORR, and the mixed site occupancy in the crystal structure induces Mn/Co-O orbital hybridizations to form an impurity energy level in the band gap to facilitate charge transfer. Furthermore, the bifunctional performance and the ORR durability can be further enhanced by acid treatment to show a lower Δ E = 0.750 V and to retain 98.5% ORR current in 12 h. This work provides not only a promising bifunctional electrocatalyst but also a new perspective of exploring simple synthesis method suitable for mass-producible electrocatalysts with highly active surfaces.
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CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Lirong Lv,Zhongguo Zhang,Sheng Wang,Yue Shan,Liangliang Wang,Tongzhou Xu,Peiran He
A series of Y Ce catalysts were prepared using Y-loaded (Y = Cu, Co, Mn) Ce-based metal–organic framework as a precursor. Mn-loaded CeO 2 exhibited significantly better catalytic activity in the catalytic oxidation of ethyl acetate (EA) than noble metal catalyst. The relationship between the physicochemical properties of Y Ce catalysts and catalytic activity was studied by different characterization methods. The enhanced catalytic activity was attributed to the strong interaction between the transition metals and Ce, high specific surface area, abundant lattice defects, more oxygen vacacies and higher O latt /(O latt + O ads + O w ) molar ratios. The main intermediates in the oxidation of EA were ethanol, acetic acid, acetone, acetaldehyde and diethyl ether.
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 7
·2577-2588
·
IF 6.119
Xian Wu,Weixin Qian,Haitao Zhang,Zhonghao Han,Hewei Zhang,Hongfang Ma,Dianhua Liu,Qiwen Sun,Weiyong Ying
CeO2 nanorods with a mean width of 11.9 nm were synthesized via a facile hydrothermal method. Subsequently, Fe/CeO2 and Fe/CeO2@xMnO2 catalysts were prepared from the CeO2 nanorods and applied in the high-temperature Fischer–Tropsch synthesis of light olefins. Results show that the CeO2 support donates electrons to Fe species, which promotes the dissociation of CO while suppressing the hydrogenation reaction, and then improves the selectivity to light olefins. The synergistic effect between Mn and Ce can improve the oxygen mobility on the catalyst surface and promote the electron-donating ability of Ce, thereby promoting the formation of χ-Fe5C2 and further improving the selectivity to light olefins. However, excess Mn hinders the contact between CeO2 and Fe species and the migration of O atoms, and electron transfer from Ce to Fe can be blocked. Additionally, the reduction of iron oxides was suppressed and subsequently the CO conversion was reduced. The best hydrocarbon distribution for light olefins was 40.4% at a CO conversion of 39.9% over the Fe/CeO2@0.2MnO2 catalyst.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xuqian Wang,Yi Xie,Kun Chen,Likexin Yi,Yabo Wang,Yongkui Zhang
Ferruginous rhodochrosite with high impurity is difficult to be utilized by traditional beneficiation process due to the complex characteristics. Herein, a bioleaching process driven by Acidithiobacillus ferrooxidans was proposed to recover Mn and Fe in ferruginous rhodochrosite with economic and environmental benefits. The biogenic Fe 3+ , H + and extracellular polymeric substances produced in bioleaching process significantly promoted the metal recovery and reduced the H 2 S emission. Optimal metal leaching efficiencies (95.94% of Mn and 97.54% of Fe) were achieved in bioleaching group. Furthermore, the Mn and Fe mixed leaching solutions could be directly adopted to fabricate Mn-Fe oxide based materials (MFO). When applied as catalysts for peroxymonosulfate (PMS) activation, the as-synthesized MFO performed well for sulfathiazole (STZ) degradation with a 98.66% removal efficiency in 40 min. Both radical process and non-radical process occurred in the advanced oxidation process, which induced the generation of abundant active species of ̇OH, SO 4 ̇ − and 1 O 2 . Meanwhile, charge transfer also contributed to STZ degradation. Favorably, MFO-3 exhibited good reusability in recycle study and showed adaptability towards various natural water matrixes. This research not only provided novel insights into the utilization of recalcitrant ferruginous rhodochrosite resources, but also enriched the strategy of PMS activator design for environmental remediation.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Fu Yang,Ruyi Wang,Shijian Zhou,Xuyu Wang,Yan Kong,Shuying Gao
The oxidative desulphurization (ODS) has become mainly popular by rapid catalytic oxidation of dibenzothiophene (DBT) relied on efficient heterogeneous catalyst. V-based catalytic active species were regarded as the potential option in the activity-preferred ODS systems. Herein, we reported the re-dispersion of vanadium oxide (VO x ) on the mesoporous silica modified with manganese oxide (Mn 3 O 4 ) through one progressive insertion approach of metal oxides in the silica. Impressively, mesopore-encaged vanadium-manganese oxides in the silica (VMn-MS) as the admirable output of excellent ODS catalyst was demonstrated compared to other monometal-modified counterparts and one-pot implanted one. The characterization results revealed the post-implanted VO x species not only deposited around the pre-covered Mn 3 O 4 on the mesoporous surface but also inserted the surface layer of Mn 3 O 4 inducing the amorphous evolution of aggregated Mn 3 O 4 and the reconstruction of final active sites. This integrated approach made the reconstructed active species afford more exposed catalytic sites and the tailored surface redox cycles owing to the electronic communication of V-Mn. The catalytic results demonstrated the excellent catalytic desulphurization efficiency (~100%) during 60 min at 80 °C, which made the sulphur content reduce to 6 mg·L −1 , remarkably superior to other comparative samples. The outstanding catalytic performance of VMn-MS catalyst can be ascribed to the synergistic effect of V-Mn dual metals rendering two different reaction pathways, which includes free-radical reaction and ring-forming reaction, where Mn site acted as active center triggering reactive free radicals which could be further optimized by surrounded V sites around Mn sites to promote the ODS process.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Kun Wu,Meng Wang,Angzhen Li,Zixuan Zhao,Ting Liu,Xiaodan Hao,Shengjiong Yang,Pengkang Jin
Mn-oxide-containing adsorbents have shown outstanding performances for the removal of As(III) through an “oxidation-adsorption” process. In this study, a new adsorbent of Fe-Mn-Cu ternary oxide (FMCTO) was fabricated to improve the redox reaction rate and to enhance the recovery of oxidative ability. FMCTO exhibited a stronger ability for As(III) removal than most of other adsorbents, because it has better oxidative capability for As(III) oxidation. The state of dynamic equilibrium for As(III) removal by FMCTO could be basically achieved within 3 h, and the As removal efficiency reached 98.9% at time = 24 h. The Langmuir As adsorption capacity of FMCTO was determined to be 204.8 mg/g. The As(III) removal efficiency of FMCTO was further boosted by 7% through oxygen gas aeration and decreased by 19% with nitrogen gas in the ambient during the first 3 h, indicating the positive effect of oxygen on As(III) oxidation. EPR and UV spectra methods were used to confirm the generation of superoxide radical (O 2 − ) and the enhanced production of Mn(III) soluble species on FMCTO surfaces, thus achieving a better As(III) oxidation performance. The XPS analysis results showed that the electron transfer from Cu(I) to Mn(IV) could improve the stability of Mn(III) within FMCTO. Meanwhile, Mn(II) ions could be oxidized to Mn(III) by O 2 − . Hence, the formation of a redox cycle between Mn(II) and Mn(III) along with the production of O 2 − plays a vital role in the upgraded As(III) removal mechanisms. This study provides new insights into the promotion of the capability of Mn-containing adsorbents for achieving the improved removal of As from As(III)-contaminated water.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 20
·6718-6729
·
IF 4.174
To Van Nguyen,Le The Son,Vu Van Thuy,Vu Dinh Thao,Masahito Hatsukano,Koichi Higashimine,Shinya Maenosono,Sang-Eun Chun,Tran Viet Thu
We report the synthesis of manganese-doped nickel cobalt oxide (Mn-doped NiCo2O4) nanoparticles (NPs) by an efficient hydrothermal and subsequent calcination route. The material exhibits a homogeneous distribution of the Mn dopant and a battery-type behavior when tested as a supercapacitor electrode material. Mn-doped NiCo2O4 NPs show an excellent specific capacity of 417 C g−1 at a scan rate of 10 mV s−1 and 204.3 C g−1 at a current density of 1 A g−1 in a standard three-electrode configuration, ca. 152–466% higher than that of pristine NiCo2O4 or MnCo2O4. In addition, Mn-doped NiCo2O4 NPs showed an excellent capacitance retention of 99% after 1000 charge–discharge cycles at a current density of 2 A g−1. The symmetric solid-state supercapacitor device assembled using this material delivered an energy density of 0.87 μW h cm−2 at a power density of 25 μW h cm−2 and 0.39 μW h cm−2 at a high power density of 500 μW h cm−2. The cost-effective synthesis and high electrochemical performance suggest that Mn-doped NiCo2O4 is a promising material for supercapacitors.
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