Sustainable Materials and Technologies
·
2023
·
IF 9.6
Miao Wang,Mei Lin,Gary Owens,Zuliang Chen
Recently, green synthetic technology has attracted much attention due to its low cost, waste-reuse and environmental friendliness. In this study, reduced graphene oxide/manganese nanoparticles hybrids (rGO/Mn NPs) were successfully synthesized utilizing green tea extract by one-step method. The rGO/Mn NPs were characterized by SEM-EDS, XRD , Raman, FTIR and BET, and the results indicate oxygen-containing functional groups in GO were effectively removed. Also, manganese nanoparticles (Mn NPs) were uniformly decorated on the rGO surface, and rGO/Mn NPs hybrids exhibited a lamellar sandwich structure, which was improve the specific surface area and provide more adsorption sites. The biomolecules in tea extract were further identified by GC–MS analysis, where showed that 1,2,3-trichlorophenol, caffeine and antioxidant were involved to the biosynthesis. Furthermore, the rGO/Mn NPs were used to simultaneously remove oxytetracycline/tetracycline (OTC/TC) with more than 90% of the removal efficiency, demonstrating that rGO/Mn NPs have a potential for treating antibiotic wastewater.
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Biomaterials Science
·
2023
·
IF 6.6
Xingtai Huang,Zihan Wang,Shujie Li,Shiqi Lin,Lirong Zhang,Zhaowei Meng,Xuejun Zhang,Shao-Kai Sun
As Gd-based contrast agents suffer from the risk of causing nephrogenic systemic fibrosis, less toxic contrast agents are urgently needed in contrast-enhanced magnetic resonance imaging (CE-MRI) of kidney injury. Herein, we develop a non-invasive diagnosis method for acute kidney injury using CE-MRI based on manganese-doped carbon dots (Mn-CDs). The synthesized Mn-CDs possess an ultrasmall size of 5 nm, good biocompatibility, and a high T1 relaxation rate (10.8 mM−1 s−1), which can produce effective positive enhancement in the kidneys and clearly show the fine structures of the kidneys including the cortex, outer medulla, and inner medulla. In an acute kidney injury model, Mn-CDs-based CE-MRI can not only accurately and intuitively reveal the site of kidney injury consistent with the pathological analysis, but also reflect the functional changes in the injured kidney. Collectively, our study provides a new strategy for the non-invasive diagnosis of acute kidney injury using CE-MRI based on Mn-CDs.
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高影响因子
Journal of Food Measurement and Characterization
·
2022
·Vol. 17
·期 2
·1662-1670
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IF 3.006
Yang Zhengfei,Zhang Weijia,Zhu Jiangyu,Yin Yongqi,Xue Huaiguo,Fang Weiming
Detection and control of nitrite are major concerns in recent years for ensuring food and environmental safety. In this study, Mn, N co-doped Co-Carbons (CoMnN-Cs) were synthesized by calcination of bimetallic Co-Mn zeolite-imidazolate framework (CoMnZIF-67) materials at different temperatures (600–900 °C) in nitrogen atmosphere. Many characterizations, such as scanning electron microscope (SEM), elemental mapping, and, N 2 adsorption–desorption were performed to analyze the morphology, structure, and composition of the CoMnN-Cs. SEM revealed the generation of rich carbon nanotubes (CNTs). Mn-doping was obtained, which could be seen from the elemental mapping. The characterization also revealed that the pyrolysis temperature has an important effect to catalytic activities. From obtained results, it was found that the CoMnN-Cs prepared at 800 °C (CoMnN-Cs-800), showed better detection performance compared with CoMnN-Cs developed at other temperatures. As a result, the CoMnN-Cs-800-based sensor manifested an extended linear range (from 0.2 to 7000 μM), a low detection limit of 0.16 μM, and high sensitivity. Meanwhile, the developed sensor exhibited good selectivity, reproducibility, and long-term stability. Moreover, the sensor achieved satisfactory recoveries for the quantification of nitrite in tap water and sausage samples. This study implies CoMnN-Cs-800 is a promising material for the measurement of nitrite. Graphical abstract
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Journal of Energy Chemistry
·
2023
·
IF 13.1
Yuan Qin,Chaozhong Guo,Zihao Ou,Chuanlan Xu,Qi Lan,Rong Jin,Yao Liu,Yingchun Niu,Quan Xu,Yujun Si,Honglin Li
Designing single-atom catalysts for oxygen reduction reaction (ORR) are fashionable but challenging to boost the zinc-air battery performance. Significantly enhanced ORR activity by manganese (Mn) single-atom catalysts can be achieved by accurately regulating the coordination number of isolated Mn atoms. Theoretical calculations indicate that the single Mn-N 5 sites possess lower free energy barrier and higher oxygen adsorption performance than single Mn-N 4 sites to accelerate the ORR kinetics. Target to it, here we synthesize an atomically dispersed Mn-N 5 catalyst by precisely axial coordination of pyridinic-N doped into two-dimensional (2D) porous nanocarbon sheets (∼3.56 nm thickness), which reveals outstanding catalytic activity and ultrahigh stability for the ORR in zinc-air battery owing to the inhomogeneous charge distribution of Mn-N 5 sites compared to the conventional single-site Mn-N 4 catalyst and Pt/C. This work gives a new strategy for in situ regulating the electronic structure of metal single-atoms and further promoting the overall ORR performance in energy systems.
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Coatings
·
2023
·Vol. 13
·期 7
·1246
·
IF 3.4
Wenjuan Qi,Desheng Ding,Weijie Luo,Weiliang Jin,Qian Kou,Chuntao Ge,Saijun Xiao
The hardness and wear resistance of amorphous Al–Mn alloy coatings can be improved by incorporating ceramic particles into them to extend their application. In this paper, Al–Mn/WC composite coatings have been prepared with electrodeposition in stirred AlCl3–NaCl–KCl–MnCl2molten salts at 180 °C with the addition of WC particles. The effects of stirring speed (400–700 rpm) and cathode current density (15–75 mA/cm2) on the produced Al–Mn/WC composite coatings have been studied. At 600 rpm and 700 rpm, the Al–Mn/WC composite coatings exhibited the best uniform distribution of the embedded WC particles, with the tested microhardness value up to 650 HV0.1, compared with 530 HV0.1of the Al–Mn alloy. Moreover, under various cathode current densities, the best quality of the Al–Mn/WC composite coating was obtained at 55 mA/cm2, with a homogeneous distribution of WC particles and the highest microhardness value (670 HV0.1). It is expected that this method could be extended to be applied for the preparation of aluminum-based and magnesium-based ceramic composite coatings.Keywords:AlCl3–NaCl–KCl–MnCl2molten salts;electrodeposition;WC particles;Al–Mn/WC composite coating
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OPTICS EXPRESS
·
2023
·Vol. 31
·期 15
·24914-24925
·
IF 3.8
Zitong Liu,Le Zhang,Le Zhang,Le Zhang,Le Zhang,Jian Kang,Jian Kang,Tianyuan Zhou,Tianyuan Zhou,Shiwei Chen,Shiwei Chen,Peng Yang,Bingheng Sun,Yang Li,Hao Chen,Hao Chen,Hao Chen
Ceramic phosphors are widely considered the next-generation phosphor material for white LED/LD lighting, and a wide spectrum is a key factor in improving the CRI of lighting sources. In this paper, a novel, to our knowledge, barcode-structured YAG:Ce/YAG:Ce,Mn ceramic phosphor was designed and fabricated. The lighting sources with the CRI value of 73.5 and 68.9 were obtained under the excitation of blue LEDs and blue LDs, respectively. Simultaneously, thanks to the effective supplementary emission from a red LD, the CRI of the ceramic-based lighting source reached 81.8 under blue LD excitation. Specifically, the microstructure and luminescent property of ceramic phosphors with different thicknesses and ion doping concentrations were systematically studied. Besides, by changing the blue power from 0.52 W to 2.60 W, the CCT of the laser lighting source with the encapsulation of optimized YAG:Ce/YAG:Ce,Mn ceramic phosphors ranged from 3928 K to 5895 K, while the CRI always maintained above 80. The above results indicate that barcode-structured Ce:YAG/Ce,MnYAG ceramic phosphor is a candidate to achieve a high CRI and ican be applied to various lighting occasions.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Bowen Dong,Yuqi Wan,Dan You,Qingrong Cheng,Zhiquan Pan
In order to alleviate the problem of water resource pollution, the exploration of visible-light driven excellent photocatalysts is an important issue for worldwide sustainable green energy systems. In this work, a novel binary hybrid nanocomposite WO 3 /Mn-ZIF-67 heterojunction photocatalyst was prepared through simple template method. It was based on the particular structure and performance of metal-organic framework (MOFs), and the structure of the heterojunction photocatalyst was expressed by SEM, TEM , FT-IR, DRS , XPS , PXRD and EIS . The novel WO 3 /Mn-ZIF-67 heterostructure showed more efficient photocatalytic properties for Tetracycline (TC) decomposition and hydrogen production than that of WO 3 monomer and Mn-ZIF-67 monomer under simulated light, respectively. Owing to the active radical catch and ESR experiments, a rational solid-state Z-model electron migration theory was rendered. Z-model mechanism can neatly be obligated to the raised degradative capacity of the photocatalytic reaction. The wonderful high-efficiency photocatalytic decomposability of heterojunction was mainly due to: (i) the WO 3 structure improved dramatically the light absorption efficiency of the photocatalyst. (ii) the doped Mn enhanced the photoelectric properties of ZIF-67. (iii) contact with the close interface between WO 3 and Mn-ZIF-67 produced efficient charge separation and migration.
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高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Liang Zhaoheng,Tian Fei,Yang Gongzheng,Wang Chengxin
Aqueous sodium-ion batteries (AIBs) are promising candidates for large-scale energy storage due to their safe operational properties and low cost. However, AIBs have low specific energy (i.e., <80 Wh kg −1 ) and limited lifespans (e.g., hundreds of cycles). Mn-Fe Prussian blue analogues are considered ideal positive electrode materials for AIBs, but they show rapid capacity decay due to Jahn-Teller distortions. To circumvent these issues, here, we propose a cation-trapping method that involves the introduction of sodium ferrocyanide (Na 4 Fe(CN) 6 ) as a supporting salt in a highly concentrated NaClO 4 -based aqueous electrolyte solution to fill the surface Mn vacancies formed in Fe-substituted Prussian blue Na 1.58 Fe 0.07 Mn 0.97 Fe(CN) 6 · 2.65H 2 O (NaFeMnF) positive electrode materials during cycling. When the engineered aqueous electrolyte solution and the NaFeMnF-based positive electrode are tested in combination with a 3, 4, 9, 10-perylenetetracarboxylic diimide-based negative electrode in a coin cell configuration, a specific energy of 94 Wh kg –1 at 0.5 A g −1 (specific energy based on the active material mass of both electrodes) and a specific discharge capacity retention of 73.4% after 15000 cycles at 2 A g −1 are achieved.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 22
·5982-5993
·
IF 7.779
Yifan Pan,Dongyan Gao,Yupeng Dang,Pengcheng Xu,Dandan Han,Changling Liu,Yen Wei,Yanru Yang
Metal–organic frameworks (MOFs) with bimetallic centers are considered as promising electrode materials for supercapacitors due to the large specific surface area and potential redox sites. In this work, the internal structure evolution, electron transfer in the metal center, and the mechanism of action of the Mn dopant to enhance conductivity in electrochemical processes are discussed. Density functional theory (DFT) calculations show that the introduction of Mn ions greatly reduces the band gap of the Ni-MOF and increases the carrier concentration, confirming the electron transfer process of electrons from Ni2+ to Mn2+ through the bridging oxygen. Therefore, the optimal NiMn-MOF produces an impressive specific areal capacity of 1.89 mA h cm−2 at 1 mA cm−2. Meanwhile, a hybrid supercapacitor (HSC) based on the NiMn-MOF electrode and activated carbon (AC) can output a high specific energy of 67.5 W h kg−1 at a specific power of 84.5 W kg−1 with excellent cycling stability (capacity retention of 94% after 10 000 cycles). Taking advantage of the high-energy storage properties of the NiMn-MOF//AC supercapacitor device, a solar power generation system is further integrated for self-powered portable electronic applications. This work broadens the applicability of activity prediction for bimetallic MOF electrode materials with high electrochemical performance.
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高影响因子
Sustainability
·
2022
·Vol. 14
·期 9
·5353
·
IF 3.889
Kun Li,Tao Zhou,Xinqiang Xu,Changye Han,Hua Zhang,Jiang Jin
Mn-Co-based catalysts were loaded to ceramic filters element by impregnation for the coprocessing of dust and nitrogen oxide (NOx) in flue gas. The influence of the Mn/Co ratio and loading on the catalytic performance was investigated. The Mn-Co-based catalytic ceramic filter with a Mn/Co molar ratio of 2/1 can achieve 99% NO conversion by selective catalytic reduction of NOxwith NH3(NH3-SCR) in the temperature range of 100−180 °C, but its resistance to H2O was relatively poor. The filter element was modified by PTFE to improve the H2O resistance. After modification, the catalytic ceramic filter showed superior resistance to H2O and SO2at low temperatures (100–180 °C) and satisfactory self-cleaning performance.Keywords:NH3-SCR;catalytic ceramic filter;PTFE-modified;H2O resistance
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Surfaces and Interfaces
·
2022
·
IF 6.137
Chengxin Li,Zhuwei Gao,Xinyu Qi,Xintong Han,Zhongxin Liu
To control the water pollution caused by industrial oily wastewater, scientific research in the field of oil-water separation has begun all over the world, which has also attracted extensive attention to green advanced separation materials. Herein, we used stainless steel mesh as one of the reactants to load metal oxide particles formed by tetrabutyl titanate (TBT), and manganese acetate on cotton mesh under acidic conditions to prepare a membrane material with excellent oil-water separation. The results showed that the 0.1/0.3/0.5 Mn-TiO2/Fe membranes prepared by high-temperature hydrothermal reaction had an excellent separation effect in the light oil and water separation after 10 cycles, and its maximum oil-water separation efficiency was 89.87%, 92.65% and 96.96% respectively. At the same time, the membrane still had good hydrophobicity after acid, alkali and high temperature and low-temperature treatment. In the light oil and water separation experiment measured after 15 times of friction with sandpaper, the 0.5Mn-TiO2/Fe membrane showed good durability, and the average separation efficiency was 93.82% respectively. This diversified wettability and separation process of stainless steel mesh load on the membrane surface has a wide range of potential applications in environmental protection, energy utilization, industrial manufacturing and so on.
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Journal of Energy Chemistry
·
2022
·
IF 13.599
Linfeng Fan,Yaxin Ji,Genxiang Wang,Zhifang Zhang,Luocai Yi,Kai Chen,Xi Liu,Zhenhai Wen
Electrolytic water splitting, as a promising route to hydrogen (H 2 ) production, is still confronted with the sluggish anodic oxygen evolution reaction (OER) and its less value-added O 2 production. Herein, we report a bifunctional electrode fabricated by in situ growth of Mn-doped CoSe 2 nanonetworks on carbon fiber cloth (Mn-CoSe 2 /CFC), which shows attractive electrocatalytic properties toward glycerol oxidation reaction (GOR) in alkali and hydrogen evolution reaction (HER) in acid. A flow alkali/acid hybrid electrolytic cell (fA/A-hEC) was then developed by coupling anodic GOR with cathodic HER with the Mn-CoSe 2 /CFC bifunctional electrode. Such fA/A-hEC enables a rather low voltage of 0.54 V to achieve 10 mA cm −2 , and maintain long-term electrolysis stability over 300-h operation at 100 mA cm −2 with Faraday efficiencies of over 99% for H 2 and 90% for formate production. The designed bifunctional electrode in such innovative fA/A-hEC device provides insightful guidance for coupling energy-efficient hydrogen production with biomass upgradation.
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