Bioactive Materials
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2021
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IF 14.593
Libin Pang,Renliang Zhao,Jing Chen,Jingxin Ding,Xiaochen Chen,Wenwen Chai,Xu Cui,Xiaolin Li,Deping Wang,Haobo Pan
Critical bone defects caused by extensive excision of malignant bone tumor and the probability of tumor recurrence due to residual tumor cells make malignant bone tumor treatment a major clinical challenge. The present therapeutic strategy concentrates on implanting bone substitutes for defect filling but suffers from failures in both enhancing bone regeneration and inhibiting the growth of tumor cells. Herein, Cu and Mn-doped borosilicate nanoparticles (BSNs) were developed for syncretic bone repairing and anti-tumor treatment, which can enhance bone regeneration through the osteogenic effects of Cu 2+ and Mn 3+ ions and meanwhile induce tumor cells apoptosis through the hydroxyl radicals produced by the Fenton-like reactions of Cu 2+ and Mn 3+ ions. In vitro study showed that both osteogenic differentiation of BMSCs and angiogenesis of endothelial cells were promoted by BSNs, and consistently the critical bone defects of rats were efficiently repaired by BSNs through in vivo evaluation. Meanwhile, BSNs could generate hydroxyl radicals through Fenton-like reactions in the simulated tumor microenvironment, promote the generation of intracellular reactive oxygen species, and eventually induce tumor cell apoptosis. Besides, subcutaneous tumors of mice were effectively inhibited by BSNs without causing toxic side effects to normal tissues and organs. Altogether, Cu and Mn-doped BSNs developed in this work performed dual functions of enhancing osteogenesis and angiogenesis for bone regeneration, and inhibiting tumor growth for chemodynamic therapy, thus holding a great potential for syncretic bone repairing and anti-tumor therapy.
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ENVIRONMENTAL POLLUTION
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2021
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IF 8.071
Anqi Huang,Dan Zhi,Yaoyu Zhou
A graphite felt (GF) cathode was firstly modified by Fe–Mn binary oxide (FMBO), active carbon (AC), carbon black (CB), and polytetrafluoroethylene (PTFE), which exhibits satisfactory ciprofloxacin (CIP) removal efficiency at neutral pH value in electro-Fenton (EF) system. Morphological data showed that modified cathodes have larger surface area and volume pore as well as more active sites. And electrochemical properties have proved stronger current response after modification. In compassion to the unmodified GF, the FMBO/AC/CB modified GF (FMBO-GF) has wider pH range and higher CIP removal efficiency due to its unique nanoparticles structure. The CIP removal efficiency achieved 95.40% in 30 min, and the removal efficiency of total organic carbon (TOC) achieved 93.77% in 2 h when conditions were optimal (25 mg/L initial CIP concentration, 2 mA/cm 2 current density, FMBO/AC: CB: PTFE of 1:1:5, and 7 initial pH value) in this study. The results of great degradation and mineralization of CIP in this study indicate that the FMBO-GF cathode has huge potential on antibiotics removals in neutral environment.
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Environmental Science-Water Research & Technology
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2020
·Vol. 7
·期 3
·479-486
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IF 3.449
Zhiwei Yang,Xiaonan Tan,Daojian Tang,Jing Li,Jiahai Ma
In this study, the contrasting activities and pathways of Mn2+/Cu2+–HCO3− systems for Congo red (CR) dye degradation are presented. The Mn2+–HCO3− system (with the well-known MnIVO as the reactive species) did not degrade CR, while the Cu2+–HCO3− system (with high-valent Cu proposed as the reactive species) had a good oxidizing ability for CR. Further, HO radicals in the classic Fenton-like system made no contribution to CR degradation with both Cu and Fe ions as catalysts. The results indicate that reactive species in metal–HCO3− AOPs need prudent examination and better understanding of the underlying mechanism would benefit the development of more efficient AOPs.
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Arabian Journal of Chemistry
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2020
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IF 4.762
Jiayao Li,Weifeng Song,Zefeng Yu,Qiuhua Li
The quality of dairy farming wastewater in different regions is particular and different. In Southern China, the Chemical Oxygen Demand (COD Cr ) and colourity of effluent from conventional dairy farming wastewater treatment processes are similar. Catalytic ozonation is a very promising technical method. In this paper, the Mn-Fe-Ce/γ-Al 2 O 3 catalyst was prepared via the optimized preparation method of impregnation roasting using γ-Al 2 O 3 as the carrier, and this catalyst was used in the ozonation of actual dairy farming wastewater from treatment facilities. The performance of the Mn-Fe-Ce/γ-Al 2 O 3 catalyst on dairy farming wastewater was investigated using a simulated dynamic test. The effects of the reaction time, pH and catalyst dosage on COD Cr and the colourity removal ratio were investigated. The results show that the optimum treatment conditions were a reaction time of 20 min, pH 9, and catalyst dosage of 15 g/L. The COD Cr removal ratio reached 48.9% and the colourity was 95% under the optimum conditions. BOD 5 /COD Cr increased from 0.21 to 0.54 after catalytic ozonation, indicating that the biodegradability of wastewater was significantly improved. This research provides a new method and theoretical guidance for dairy farming wastewater treatment.
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ENERGY & FUELS
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2020
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IF 3.421
Jun Chen,Yi Chen,Dzmitry Hrynsphan,Yu Mei,Hua Pan,Jiali Wu,Jianmeng Chen,Jiachao Yao
FeII(EDTA) solution has been considered an efficient option in wet flue gas denitrification, whereas the generated FeII(EDTA)–NO restricts its wide application, suggesting that FeII(EDTA)–NO reduction is the key to this process. This work investigated the performance, kinetics, and mechanism of FeII(EDTA)–NO reduction by Mn powder coupled with manganese ion (Mn2+) recovery. We initially studied the performance of FeII(EDTA)–NO reduction with respect to the major influencing factors (i.e., the particle size of Mn powder, initial FeII(EDTA)–NO concentration, Mn powder concentration, stirring speed, and temperature). Shrinking core model and Arrhenius law were applied to illustrate the kinetics and mechanism between FeII(EDTA)–NO solution and Mn powder, suggesting that the solid–liquid reaction was fitted on chemical reaction control, and the activation energy was calculated as 43.0 kJ mol–1. The effects of main operating parameters, such as precipitant concentration, pH value, and temperature, were studied on Mn2+ recovery. Results indicated that the pseudo-second-order model could precisely describe the kinetics of Mn2+ recovery. Finally, according to Arrhenius and Eyring–Polanyi equations, the reaction activation energy, enthalpy of activation, and entropy of activation for Mn2+ recovery were calculated as 17.25 kJ mol–1, 14.55 kJ mol–1, and 252.07 J (k mol)−1, respectively.
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Nanomaterials
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2020
·Vol. 10
·期 9
·1629
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IF 4.324
Ranran Jiao,Li Zhao,Shuli Zhou,Yanjun Zhai,Denghu Wei,Suyuan Zeng,Xianxi Zhang
In this study, a simple method was adopted for the synthesis of MnO@C nanocomposites by combining in-situ reduction and carbonization of the Mn3O4precursor. The carbon content, which was controlled by altering the annealing time in the C2H2/Ar atmosphere, was proved to have great influences on the electrochemical performances of the samples. The relationships between the carbon contents and electrochemical performances of the samples were systematically investigated using the cyclic voltammetry (CV) as well as the electrochemical impedance spectroscopy (EIS) method. The results clearly indicated that the carbon content could influence the electrochemical performances of the samples by altering the Li+diffusion rate, electrical conductivity, polarization, and the electrochemical mechanism. When being used as the anode materials in lithium-ion batteries, the capacity retention rate of the resulting MnO@C after 300 cycles could reach 94% (593 mAh g−1, the specific energy of 182 mWh g−1) under a current density of 1.0 A g−1(1.32 C charge/discharge rate). Meanwhile, this method could be easily scaled up, making the rational design and large-scale application of MnO@C possible.Keywords:MnO@C nanocomposites;carbon content;current density;lithium-ion battery;transition metal oxide anode
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APPLIED SURFACE SCIENCE
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2019
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IF 5.155
Haitao Li,Qiang Gao,Guanshuai Wang,Bo Han,Kaisheng Xia,Chenghang Zhou
Developing high-performance heterogeneous Fenton-like catalyst and understanding its intrinsic catalytic properties are of fundamental and practical significance. In this work, a mesoporous Mn(II)-doped CeO 2 (MCO) with monodisperse spherical morphology and large surface area (141.8 m 2 g −1 ) was fabricated through a simple hydrothermal–calcination process, and further utilized as the heterogeneous catalyst for oxidative degradation of organic pollutants in the presence of H 2 O 2 . The density functional theory (DFT) simulations were carried out to study the H 2 O 2 decomposition process on the MCO surface. It was revealed that the Mn(II) doping in the CeO 2 could significantly promote the complex of the surface Ce sites and H 2 O 2 molecules. More importantly, the manganese dopants could serve as electron reservoirs, capable of reversibly donating and accepting electrons, which facilitated the electron transfer between Ce and H 2 O 2 . Owing to the electron reservoir properties of manganese, this MCO showed significantly enhanced catalytic efficiency in comparison to pure CeO 2 . Moreover, the catalytic activity of MCO almost kept unchanged after reuse several times, demonstrating its long-circulating characteristics. This study provides new and important insights into the electron transfer pathway involved in the heterogeneous Fenton-like process.
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DYES AND PIGMENTS
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2019
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IF 4.018
Xiuquan Xu,Songmei Wang,Tongjie Hu,Xiaofeng Yu,Jiapeng Wang,Chao Jia
Co-doping has been proven to significantly enhance the photocatalytic performance of g-C 3 N 4 . Herein, Mn and O co-doped g-C 3 N 4 (Mn/O-CN) composites were constructed for the first time by a simple one-pot calcining route. The systematic characterization results of XRD , FT-IR, TEM-EDS, XPS and DRS revealed that the Mn and O elements were co-doped into the CN framework successfully as Mn 3+ / 4+ and n-π* conjugate forms, respectively. The as-prepared Mn/O-CN-2 achieved the highest visible-light-driven degradation rate constant of 0.0290 and 0.0267 min −1 for degradation of Malachite green (MG) and Amido black 10B (AB 10B), which were about 5.09 and 5.45 folds higher than that of pristine CN, respectively. The improved photocatalytic degradation property of Mn/O-CN were mainly benefited from the extended visible light utilization, the enlarged specific surface area, and the accelerated separation and transfer of photo-induced charge carriers, which were all induced by the synergistic effects of Mn and O co-doped. Finally, the active species capturing experiments proved that the superoxide radicals (·O 2 − ) and holes (h + ) acted as the predominant roles in the photocatalytic degradation process .
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2022
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IF 7.305
Yun Da,Jialei Zhou
The ability of calcium-based composites to simultaneously improve optical absorption and accelerate decomposition kinetics represents a major endeavor direction in the direct solar-driven thermochemical energy storage system. Doping strategy has been macroscopically proved to be an effective way in boosting optical absorption properties and calcination kinetics, but the underlying microscopic mechanisms are still unclear. This paper aims to reveal the mechanisms of optical absorption enhancement and accelerated decomposition kinetics for Mn-doped CaCO 3 through both experiments and density function theory (DFT). In the experiment, the optical absorption of Mn-doped CaCO 3 was much higher than that of pure CaCO 3 . The sample CaCO 3 –7Mn displayed satisfied optical absorption and fabulous cycling stability. The optical absorption reached 74% and energy storage density only decreased 2.6% after 20 cycles. Meanwhile, the decomposition reaction rate equations of pure CaCO 3 and Mn-doped CaCO 3 were obtained via non-isothermal kinetic analysis . The results indicated that doping Mn could accelerate decomposition kinetics of CaCO 3 by reducing the apparent activation energy . In the DFT calculation, the complex refractive index of Mn-doped CaCO 3 was lower in real part (refractive index) and higher in imaginary part (extinction coefficient) within the wavelength range from 300 to 2500 nm compared with pure CaCO 3 , which was closely related to the electron cloud distribution in the calcite crystal structure. Moreover, Mn-doped CaCO 3 has lower transition state energy barrier and dissociation energy than pure CaCO 3 . The calculation results revealed the mechanisms of doping Mn in CaCO 3 to enhance the light absorption and accelerate the decomposition kinetics from the microscopic perspective at atomic level. This work contributes to understanding the physical mechanisms of doping elements on boosting the performance of calcium-based composites at the molecular level.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Xiaoyun Zhang,Fan Yang,Siyuan Sun,Kexin Wei,Hongchen Liu,Guohua Li,Yang Sun,Xi Li,Jinxiu Qian,Shaoxiong Du,Mingjie Li,Yi Lu,Chuangui Xia,Sai Che,Yongfeng Li
An electrocatalyst of single-atomic Mn sites with MnP nanoparticles (NPs) on N, P co-doped carbon substrate was constructed to enhance the catalytic activity of oxygen reduction reaction (ORR) through one-pot in situ doping-phosphatization strategy. The optimized MnSA-MnP-980℃ catalyst exhibits an excellent ORR activity in KOH electrolyte with a half-wave potential (E 1/2 ) of 0.88 V (vs. RHE), and the ORR current density of MnSA-MnP-980℃ maintained 97.9 % for over 25000 s chronoamperometric i-t measurement. When using as the cathode, the MnSA-MnP-980℃ displays a peak power density of 51 mW cm −2 in Zinc-Air batteries, which observably outperformed commercial Pt/C (20 wt%). The X-ray photoelectron spectroscopy reveal that the doped P atoms with a strong electron-donating effectively enhances electron cloud density of Mn SAs sites, facilitating the adsorption of O 2 molecules. Meanwhile, the introduction of MnP NPs can regulate the electronic structure of Mn SAs sites, making Mn SAs active sites exist in a low oxidation state and are less positively charged, which can supply electrons for ORR process to narrow the adsorption energy barrier of ORR intermediates. This work constructs novel active sites with excellent ORR properties and provides valuable reference for the development of practical application.
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JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Yiqiong Yang,Borui Jie,Yixuan Zhai,Yijie Zeng,Jingyan Kang,Geng Cheng,Xiaodong Zhang
Due to the uncontrolled synthesis of layered double hydroxides (LDHs), a simple and efficient strategy was needed to construct high-performance LDHs. Herein, Co-Mn-ZIF was used as the sacrificial template to form cobalt-manganese-nickel LDH (M−Co−Mn−Ni LDH) through the process of deconstruction and reconstruction. Due to the sufficient in-situ etching of the Co-Mn-ZIF template, M−Co−Mn−Ni LDH exhibited a larger specific surface area (482.4 m 2 /g) and pore volume (3.3 × 10 −2 cm 3 /g) as well as easier diffusion and interaction with reaction sites of organic molecules. The prepared M−Co−Mn−Ni LDH showed high catalytic performance for the degradation of enrofloxacin (ENR) by activating peroxymonosulfate (PMS), with the removal rate of 88.5 % within 30 min. The quenching reaction and electron paramagnetic resonance (EPR) analysis results indicated that SO 4 •− and 1 O 2 were main active substances in the oxidation process of ENR. In addition, the Co-Mn-Ni LDH/PMS system was stable and almost unaffected by pH values, organic and inorganic substances, and it could achieve high removal efficiency in various pollutant samples. This work provided a convenient and efficient approach for the construction of high-performance MOFs derived LDHs catalysts.
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Journal of Energy Chemistry
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2023
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IF 13.1
Yuting He,Hongtao Li,Yi Wang,Yufei Jia,Yongning Liu,Qiang Tan
M−N−C (M = Fe, Co, Ni, etc.) catalyst owns high catalytic activity in the oxygen catalytic reaction which is the most likely to replace the Pt-based catalysts. But it is still a challenge to further increase the active site density. This article constructs the high-efficiency FeMn-N/S-C-1000 catalyst to realize ORR/OER bifunctional catalysis by hetero-atom, bimetal (Fe, Mn) doped simultaneously strategy. When evaluated it as bi-functional electro-catalysts, FeMn-N/S-C-1000 exhibits excellent catalytic activity ( E 1/2 = 0.924 V, E j =10 = 1.617 V) in alkaline media, outperforms conventional Pt/C, RuO 2 and most non-precious-metal catalysts reported recently. Such outstanding performance is owing to N, S co-coordinated with metal to form multi-types of single atom, dual atom active sites to carry out bi-catalysis. Importantly, nitrite poison test provides the proof that the active sites of FeMn-N/S-C are more than that of single-atom catalysts to promote catalytic reactions directly. To better understand the local structure of Fe and Mn active sites, XAS and DFT were employed to reveal that FeMn-N 5 /S-C site plays the key role during catalysis. Notably, the FeMn-N/S-C-1000 based low-temperature rechargeable flexible Zn-air also exhibits superior discharge performance and extraordinary durability at −40 °C. This work will provide a new idea to design diatomic catalysts applied in low-temperature rechargeable batteries.
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