Journal of Materials Chemistry B
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2023
·Vol. 11
·期 21
·4752-4762
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IF 7
Zhe Yang,Yueqi Zhao,Yang Li,Lei Song,Yangliu Lin,Kaimeng Liu,Yujia Zhang,Andrei V. Zvyagin,Linan Fang,Yuanqing Sun,Bai Yang,Quan Lin
Surgical resection is the main method for oral tongue squamous cell carcinoma (OTSCC) treatment. However, the oral physiological function and aesthetics may be seriously damaged during the operation with a high risk of recurrence. Therefore, it is important to develop an alternative strategy with precise guidance for OTSCC treatment. Herein, multifunctional Au/Mn nanodots (NDs) are designed and synthesized. They can perform multimodal bioimaging, including computed tomography (CT) and magnetic resonance imaging (MRI) simultaneously, and exhibit bright near-infrared fluorescence imaging (FI) for navigation, and even integrate photothermal therapy (PTT) property. The localization of OTSCC relies on visual and tactile cues of surgeons while lacking noninvasive pretreament labeling and guidance. Au/Mn NDs provide CT/MRI imaging, giving two means of accurate positioning pretherapy. Meanwhile, the fluorescence of the Au/Mn NDs in the near-infrared region (NIR) is beneficial for noninvasive labeling and intuitive observation with the naked eye to determine the tumor boundary during PTT. Further, Au/Mn NDs showed excellent results in ablating tumors in vivo. Above all, the Au/Mn NDs provide a key platform for multimodal bioimaging and PTT in a single nanoagent, which demonstrated attractive performance for OTSCC treatment.
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ELECTROCHIMICA ACTA
·
2021
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IF 6.901
Chen Hou,Yi-Ran Xing,Le-Le Yu,Yong-Heng Si,Han Lu,Yu-Juan Zhao
Fe–Mn based Li-rich cathode materials are regarded as one of the most promising cathode materials for their low cost and high energy density but possess drawbacks such as high oxygen release, low conductivity, and slow kinetics for lithium-ion transport. To address these issues, herein, we proposed a high-valance cations Nb 5+ doping strategy and synthesized a series of Li 1.26 [Fe 0.22 Mn 0.52 ] 1−x Nb 0.74x O 2 ( x = 0, 0.02, 0.03, 0.04) cathode materials. Using a combination of experimental approaches and density functional theory (DFT) calculations, we found that the doped samples presented expanded interlayer spacing for Li-ion migration and better structural stability due to the large ionic radius of Nb 5+ and the strengthened Nb–O bond. Moreover, Nb doping could not only decrease the band gap and the density of states of the O 2p band but also contribute extra electrons to surrounding O atoms, thereby enhancing electronic conductivity and stabilizing lattice oxygen. Benefit from the underlying mechanisms mentioned above, the Nb 0.022 sample possessed a higher Coulombic efficiency (71.1 vs 65.0%) at 0.2 C, showing more stable cycling performance (90.4 vs 67.7 mAh g −1 ) at 0.5 C and rate capability. These favorable results can assist in the development of Fe–Mn based Li-rich cathode materials with excellent electrochemical properties.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yaheng Zhang,Chao Fan,Dongdong Ge,Qinggang Zhang,Shouqiang Huang,Guohua Zhang,Jiayu Su
For the detection of anions from wastewater, the perovskite materials synthesized should have suitable stability and be as hydrophilic as possible, and it’s not appropriate to introduce organic ligands. Mechanochemical reaction can avoid the use of organic solvents and provide improved stability for the perovskite materials due to their large particle size and compact structure, but their fluorescence is often too weak. To solve this problem, the Mn 2+ doping effect was introduced into the CsPbCl 3 crystals, and their synthesis doping strategies driven by mechanical grinding were systematic studied. The optimal Mn 2+ -doped CsPbCl 3 (CsPbCl 3 :Mn) product was obtained by optimizing the synthesis conditions of Mn 2+ source, grinding time on each reaction stage, Mn: Pb feeding ratio, and the sintering temperature . CsPbCl 3 :Mn had the same crystal structure as its undoped counterpart, while an obvious photoluminescence emission peak at 604 nm was obtained, which was originated from the doped Mn 2+ ions. CsPbCl 3 :Mn had good stability against the ethanol environment and there was no organic ligands to hinder the ion exchange between Cl - and Br - from wastewater. Through testing the color difference of the resultant powders, a linear relationship with high correlation coefficient above 0.99 was established between chroma and Br - concentrations, and the Br - concentration in wastewater was accurately determined, demonstrating a promising application prospect of CsPbCl 3 :Mn in the fast detection of Br - ions.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·
IF 5.8
Wang Lanbin,Chen Yu,Xu Yangming,Ma Yanping,Du Yaguang
With the shortage of high-quality raw materials and increasingly strict environmental regulations, the recovery of metals from copper slag and pyrolusite has become a research hotspot. A novel method for simultaneously extracting Mn and Fe from pyrolusite and copper slag has been proposed. Under the optimal conditions (Copper slag / Pyrolusite = 2, H 2 SO 4 = 2 M, liquid—solid ratio = 10, T = 90 ℃, holding time = 60 min), the leaching efficiencies of Mn and Fe can reach 98.28% and 99.04%, respectively. In addition, the treated residue containing 60.04 wt% SiO 2 can be used as a raw building material. Through chemical kinetics and mineralogical transformation analyses, Fe 2 SiO 4 in copper slag decomposes to release Fe 2+ , which can reduce and leach Mn from pyrolusite. The unreacted shrinkage nuclear reaction model under the control of the surface chemical reaction is the most suitable model to describe the process, and when the apparent activation energy is 35.50 kJ/mol, the apparent rate equation is:
$$1-{\left(1-\times \right)}^{1/3}=979.65{\left[\mathrm{CS}/\mathrm{Pyrolusite}\right]}^{2.6072}{\left[{\mathrm{H}}_{4}{\mathrm{SO}}_{4}\right]}^{1.3143}{\left[\mathrm{L}/\mathrm{S}\right]}^{0.5649}e\mathrm{xp}\left(-35.50/\mathrm{RT}\right)$$ Graphical Abstract
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 26
·期 1
·373-380
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IF 3.3
Wenfang Peng,Rongrong Hu,Bobo Yang,Qiaoyun Wu,Pan Liang,Lin Cheng,Xixi Cheng,Yuefeng Li,Jun Zou
Metal halide perovskites are particularly emerging for optoelectronic applications in light-emitting diodes, photodetectors, and solar cells due to their flourishing photophysical properties. However, the poor stability of three-dimensional (3D) lead halide perovskite nanocrystals (NCs) significantly hampers their optoelectronics and photovoltaics applications. Embedding 3D perovskites into zero-dimensional (0D) perovskite crystals and doping ions of appropriate elements into host lattices provide effective approaches to improve the stability and optical-electronic performance. In this study, millimeter-scale Mn-doped and undoped CsPbBr3/Cs4PbBr6 perovskite crystals were successfully fabricated by a one-step slow cooling method. We systematically investigated the effects of Mn2+ ion doping on the PL performance and stability of CsPbBr3/Cs4PbBr6 crystals. Compared with undoped crystals, the existence of Mn2+ ions not only blue-shifted the PL peak but also improved the luminescence performance and stability of the prepared millimeter-sized crystals. Moreover, doping Mn2+ ions can increase the proportion of radiative recombination at low temperature, which may be because Mn2+ ions can effectively accelerate the decay of a dark exciton by the magnetic mixing of bright and dark excitons. In addition, green LED devices with high efficiency packaged as-grown crystals are explored, which promises further application in display backlights.
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ADVANCED ENGINEERING MATERIALS
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2023
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IF 3.6
Kai Wang,Hengtai Zhang,Jinrong Liang,Zhigang Xu,Shangyu Huang,Jian Peng,Chao Yang,Wenjun Li,Qiang Shen,Chuanbin Wang
Al content is of great importance for the evolution of the microstructure and compressive performance of the high-Mn and high-Al porous steels. Herein, Fe–Mn–Al porous steels with different Al contents are prepared via powder sintering at different temperatures. The results show that the main phases of the sintered samples at 640 °C are α-Fe, α-Mn, and Al, while a small amount of Fe 2 Al 5 and Al 8 Mn 5 exists in the samples with 15 and 20 wt% Al. At 1200 °C, the sintered sample with 5 wt% Al is composed of γ-Fe, while those with 15 and 20 wt% Al are mainly α-Fe. The length of Mn depletion region and porosity of the samples increase with the increase of Al content. The largest total and open porosity are observed in the 1200 °C-sintered sample with 20 wt% Al, which are 63.1 and 60.7 vol%, respectively. The compressive strength decreases sharply from 770 MPa for the sample with 5 wt% Al to 7.5 MPa with 15 wt% Al, after sintering at 1200 °C. Ductile fracture occurs in the sample with 5 wt% Al, while brittle fracture is the main fracture mode in those with 15 and 20 wt% Al.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Ao Zhou,Zhihong Liu,Zhiyong Liu
With the imminent peak in the retirement of rechargeable lithium-ion batteries worldwide, the development of efficient methods for recycling valuable elements from LIBs has attracted considerable attention. In this work, a novel method of NH 4 HSO 4 reduction roasting-selective ammonia leaching was proposed to thoroughly separate Li and Mn from the spent LiMn 2 O 4 cathode materials . Using the TG-DSC-FTIR, XRD, SEM-EDS and ICP methods, the detailed mechanism of reduction roasting process was revealed, showing that the Mn 4+ and Mn 3+ in the spinel structure of LiMn 2 O 4 were reduced by the NH 4 + from the molten ammonium salt, and transformed into water-soluble MnSO 4 and Li 2 Mn 2 (SO 4 ) 3 . According to the water-leaching performance of the roasting products, the sulfation conversion rate of Mn reaches 98.1 %, while Li is almost completely transformed under the optimal roasting conditions (475 ℃, 60 min). Using the NH 3 ·H 2 O-air leaching-system, complete separation of Li and Mn can be achieved. It was shown that the introduction of air into the ammonia solution at a rate of 0.2 L/min under the optimal leaching condition leads to Mn precipitation in the form of nanoscale Mn 3 O 4 particles with a precipitation rate of over 99.99 %, while Li still remains completely leached. Based on the in situ detection of the oxidation reduction potential and pH during the selective leaching, the key mechanism of efficient Mn precipitation was revealed. that is, the increasing potential accelerates the oxidation of Mn(OH) 2 , and the rapid consumption of Mn(OH) 2 promotes the hydrolysis of Mn 2+ , thereby achieving a significant improvement in the separation efficiency of Li and Mn.
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ENVIRONMENTAL TECHNOLOGY
·
2023
·
IF 2.8
Zhen-Xing Yang,Fang-Fang Ye,Ding Pan,Guang-Xu Yan,Shao-Hui Guo
Acrylonitrile wastewater was an organic wastewater with strong toxicity and poor biodegradability. Therefore, electro-catalytic technology became a promising acrylonitrile wastewater treatment technology because of no secondary pollution, wide application range and low water quality requirements. The optimal Mn-Sn modified Ru-Ir electrode material was synthesized by thermal method and applied in electro-catalytic treatment of acrylonitrile wastewater. The electrode materials were characterized by SEM, TEM, XRD, XPS and electrochemical characterization. SEM, TEM, XRD and XPS indicated that Mn and Sn were capable of incorporating and replacing the part of Ru or Ir and could alter the microstructure of Ru-Ir and the types of Mn and Sn oxides, raising the oxygen evolution potential (OEP) and voltampere charge. When the molar ratio of Mn-Sn was 1:1, OEP, voltampere charge and exchange current density could reach 1.303 V, 1.51 C/cm2 and 6.29×10-4 A/cm2, respectively. The co-doping of Mn-Sn had significant influence on the electrocatalytic performance of Ru-Ir electrode materials. The optimum synthesis conditions of Mn-Sn modified Ru-Ir electrode were as follows: the molar ratio of Mn-Sn was 1:1, calcination time was 4.0 hours, calcination temperature was 450℃, and solvent was water. Under certain conditions, the removal rate of acrylonitrile with Mn-Sn modified Ru-Ir electrode was 100%. Mn-Sn modified Ru-Ir electrode had high oxygen evolution potential and good removal effect of acrylonitrile, which was higher than that of ruthenium iridium electrode and RuO2 electrode.
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Materials Today Physics
·
2023
·
IF 11.5
Sitong Wei,Lu Yu,Zipei Zhang,Zhen Ji,Sitong Luo,Jingxuan Liang,Weiyu Song,Shuqi Zheng
Cu 3 SbSe 4 -based thermoelectric materials , known for their complex crystal structure and splendid Seebeck coefficient , have garnered significant attention. However, a major challenge in this field is further enhancing the thermoelectric performance while effectively controlling the carrier concentration. In this work, a novel doping strategy is proposed to effectively adjust the energy band structure by Mn doping while simultaneously increasing the carrier concentration and the effective mass of the density of states , thereby optimizing the power factor. Additionally, Sn doping is employed to boost the carrier concentration significantly while strengthening the covalent bonds , thereby improving the samples’ stability. As a result, the Cu 3 Sb 0.92 Mn 0.06 Sn 0.02 Se 4 sample achieves a zT value of 0.74 at 673 K. Moreover, the Cu 3 Sb 0.93 Mn 0.06 Sn 0.01 Se 4 sample exhibits an average zT value of 0.39 within the temperature range of 273–675 K. This research sheds light on an approach for designing high-performance Cu 3 SbSe 4 -based thermoelectric materials by manipulating the carrier concentration and enhancing the covalent bond strength through doping.
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JOURNAL OF MOLECULAR STRUCTURE
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2023
·
IF 3.8
Zhi Shen,Qi-yang Li,Shu-kui Shi,Guo Zang,Wen-jun Lv,Qiang Zhao
In order to further enrich the research on the synthesis of complexes with multi carboxyl ligands and transition metals. In this study, [1,1′-biphenyl]-2,4′-dicarboxylic acid ligand (H 2 bpda), 2,2′-dipyridyl (2,2′-dipy) and 4,4′-dipyridyl (4,4′-dipy) were used to construct metal complexes with Zn 2+ , Mn 2+ , Co 2+ and Ni 2+ by solvothermal reaction, and seven complexes were constructed, namely, [Zn(Hbpda) 2 (4,4′-dipy) 2 ] ( 1 ), [Mn(Hbpda) 2 (4,4′-dipy) 2 •(4,4′-dipy)] n ( 2 ), [Co(Hbpda) 2 (4,4′-dipy) 2 ] ( 3 ), [Ni(bpda)(4,4′-dipy) 1.5 •4H 2 O] n ( 4 ), [Mn(bpda)(2,2′-dipy)] n ( 5 ), [Co(bpda)(2,2′-dipy) •2H 2 O] n ( 6 ) and [Ni(bpda)(2,2′-dipy) •2H 2 O] n ( 7 ); Single crystal x-ray diffraction analyses reveal that complexes 1 and 3 have zero-dimensional mononuclear structure, 2, 4 and 5 have one-dimensional chain structure, 6 and 7 have two-dimensional network structure. Furthermore, solid state fluorescence properties of complexes 1–7 and magnetic properties of complexes 2, 3, 4, 5, 6 and 7 were investigated. The fluorescent test results show that complex 1 has excellent fluorescence performance and the fluorescence intensity is higher than that of ligand; The magnetic results indicate that complexes 2, 4 and 7 have ferromagentic property and complexes 3, 5 and 6 have antiferromagentic property.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Boyu Li,Yingjie Li,Yehui Dou,Yuzhuo Wang,Jianli Zhao,Tao Wang
To achieve high heat storage capacity, excellent mechanical, optical and thermal properties in calcium looping thermochemical heat storage, the novel SiC/Mn co-doped CaO pellets were fabricated by the extrusion-spheronization method. The heat storage performances of the novel CaO pellets were studied under harsh calcination (pure CO 2 , 950 °C) and pressurized carbonation (pure CO 2 , 13 bar, 800 °C) conditions in a dual fixed-bed reactor system. The additions of SiC and Mn enhance the cyclic stability of CaO pellets during the multiple heat storage cycles. When the mass ratio of CaO:SiC:MnO 2 is 100:5:5, the co-doped CaO pellets exhibit an excellent heat storage performance. The effective conversion and heat storage density of the co-doped CaO pellets are 41.5% higher than those of original CaO pellets, respectively. Meanwhile, the co-doped CaO pellets possess a good optical absorption capacity and a high thermal conductivity , which are 17.6 and 3.2 times as high as those of original CaO pellets, respectively. In addition, the co-doped CaO pellets show much higher crushing strength and lower weight loss during the attrition test. The stronger interaction between SiC and CaO cluster mitigates the movement of CaO, which is determined by density functional theory simulation. The adsorption of CO 2 onto the CaO surface is enhanced by the addition of Mn. Therefore, SiC/Mn co-doped CaO pellets used in the calcium looping thermochemical heat storage process appear promising.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Zhitang Fang,Wanyun Li,Bangchuan Zhao,Jin Bai,Kunzhen Li,Hongyang Ma,Xuebin Zhu,Yuping Sun
A series of Li-rich Mn-based layered material Li1.2Ni0.13Co0.13Mn0.54O2 (LMR) with different particle sizes and particle-size distributions (PSDs) have been successfully synthesized via a combustion method using different manganese sources. The particle size of the N-LMR material prepared using Mn(NO3)2·4H2O as the manganese source is the smallest, and its PSD range is the narrowest among all of the samples. The unique particle size and PSD have a great influence on the electrochemical kinetics of Li-ion extraction/insertion reactions, leading to enhanced electrochemical performance when used as a cathode material for both the half and full Li-ion cells, especially the specific charge capacity at high current rates. The value of the charge specific capacity will determine the state of charge at the initial discharge stage and then influence the discharge process of these Li-rich Mn-based oxides. The N-LMR electrode delivers an initial discharge capacity of 309.2 mA h g–1 at 0.1C, and the specific capacity can reach up to 208.1 mA h g–1 at 1C. After 140 cycles, the electrode can still maintain 95.6% of its initial specific capacity at 1C. Moreover, the material displays a superior high-temperature lithium storage property at 55 °C and the full cells using N-LMR as the cathode material also show a much better electrochemical performance.
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