JOURNAL OF MOLECULAR STRUCTURE
·
2023
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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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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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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yunfei Song,Chengzhi Huang,Yuanfang Li
Vacancy engineering as an effective strategy has been widely employed to regulate the enzyme–mimic activity of nanomaterials by adjusting the surface, electronic structure, and creating more active sites. Herein, we purposed a facile and simple method to acquire transition metal manganese oxide rich in oxygen vacancies (OVs-Mn2O3-400) by pyrolyzing the precursor of the Mn(II)-based metal–organic gel directly. The as-prepared OVs-Mn2O3-400 exhibited superior oxidase-like activity as oxygen vacancies participated in the generation of O2•–. Besides, steady state kinetic constant (Km) and catalytic kinetic constant (Ea) suggested that OVs-Mn2O3-400 had a stronger affinity toward 3,3′,5,5′-tetramethylbenzidine and possessed prominent catalytic performance. By taking 2-phospho-l-ascorbic acid as the substrate, which can be converted into reducing substance ascorbic acid in the presence of alkaline phosphatase (ALP), OVs-Mn2O3-400 can be applied as an efficient nanozyme for ALP colorimetric analysis without the help of destructive H2O2. The colorimetric sensor established by OVs-Mn2O3-400 for ALP detection showed a good linearity from 0.1 to 12 U/L and a lower limit of detection of 0.054 U/L. Our work paves the way for designing enhanced enzyme-like activity nanozymes, which is of significance in biosensing.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Cong Qin,Zhanxiang Wei,Bing Wang,Yingde Wang
In the realm of gas sensors, p-type metal oxide semiconductor (MOS) usually exhibits inherently low sensitivity toward target gases caused by the hole accumulation layer configuration , which seriously hinders its practical application. Diatomics co-doping is an efficient tactic for adjusting the characteristics of MOS related to gas-sensing due to their synergistic effect . In this work, we controllably synthesized bare Co 3 O 4 , Sn-doped Co 3 O 4 , Mn-doped Co 3 O 4 and Sn/Mn co-doped Co 3 O 4 nanosheets . The experimental results reveal that Sn/Mn co-doped Co 3 O 4 sample presents porous nanosheets structure. 1 mol% Sn/Mn co-doped Co 3 O 4 sensor presents enhanced response [(R g -R a )/R a = 330 %∼40 ppm at 150 °C] toward CO compared with the bare Co 3 O 4 , 1 mol% Sn-doped Co 3 O 4 , and 1 mol% Mn-doped Co 3 O 4 nanosheets. Besides, 1 mol% Sn/Mn co-doped Co 3 O 4 nanosheets show a low limit of detection (500 ppb/experimental value), good stability and selectivity. We infer that the good CO-sensing properties may be ascribed to the oxygen vacancies defects generated by Sn 4+ and Mn 2+ /Mn 3+ co-doping, high Co 3+ ratio, and high specific surface area. This study affords an effective co-doping strategy for enhancing the gas-sensing performances of p-type MOS.
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Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 21
·4752-4762
·
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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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yukun Li,Yongfu Liu,Zhaohua Luo,Zehua Liu,Svenja Hanson,Chengheng Pang,Hui Lin,Haiming Qin,Jun Jiang
Ce/Mn/Cr: Y 3 Al 5 O 12 transparent ceramics with a pure garnet structure and a high color rendering index were prepared by a solid-state reaction method. Mn 2+ and Cr 3+ enhance the emission between 500 and 700 nm and expand the conventional Ce: YAG phosphors spectrum. The Ce 3+ can work both, as activators and sensitizers, and the intense energy transfer from Ce 3+ to Mn 2+ /Cr 3+ is realized through the non-radiative and radiative processes. In the sample with the optimized doping concentration the high color rendering index (CRI) value of 75.3 can be achieved under a 450 nm laser diode excitation. The chromaticity coordinates can be tuned from (0.3125, 0.3232) to (0.2917,0.2851) by varying the doping concentration. With the increasing Mn 2+ /Cr 3+ doping concentration, the lifetime of Ce 3+ , quantum efficiency and luminous efficiency are all gradually decreased. This work effectively offers a scheme for realizing the high color rendering performance of phosphor-converted transparent ceramics in white LEDs/LDs.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yujie Yang,Chengxin Li,Zhuwei Gao,Xinyu Qi,Lan He,Wei Huang,Jieqiong Wang,Zhongxin Liu
In recent years, oily wastewater has become an important factor in environmental pollution. As a transition metal element, manganese is able to introduce new impurity band gaps using d -orbital hybridization to extend the photoresponse range of TiO 2 , thus enabling TiO 2 to be self-cleaned under UV irradiation more easily. Therefore, we synthesized superhydrophobic/submerged superoleophobic Mn@TiO 2 -modified membranes which possess a self-cleaning property under UV light using manganese element-doped titanium dioxide and cotton fabric as the substrate by hydrothermal method and then investigated the relevance between the doping concentration of Mn and super-hydrophobicity. The results showed that water contact angles of prepared membranes with the Mn ions doping concentrations of 0.5 mol/L, 1.0 mol/L, and 1.5 mol/L were 147.89°, 150.43°, and 153.37°, respectively. The membrane with 1.5 mol/L was effective for the separation of the dichloromethane-water mixture. Under Xenon lamp irradiation, three membranes with different concentrations showed a significant temperature increase with the maximum rising to 53.1 ℃ within 2 min, reflecting an excellent photothermal conversion capability. In addition, the decontamination ability of the Mn@TiO 2 membrane was tested under UV light. The Mn@TiO 2 membrane was able to degrade the oil-red solution dripping on the surface, showing that the membrane had a good self-cleaning performance, which was significant for industrial applications.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Liwei Yang,Fashan Yang,Heng Zhang,Hongyu Zhou,Mengfan Luo,Yunmei Liu,Chuanliang Zhao,Lu Zheng,Bo Lai
At present, the potential mechanism of manganese oxide (MnO 2 ) activation of PI and the key active sites of PI activation are still unclear and controversial. To this end, three different crystal forms of MnO 2 were prepared in this study and used to activate PI to degrade pollutants. The results showed that different crystal types of MnO 2 showed different catalytic abilities, and the order was γ-MnO 2 > α-MnO 2 > β-MnO 2 . Through quenching experiments, EPR tests, Raman experiments and in situ electrochemical experiments, it has been confirmed that electron transfer-mediated non-free radical process is the main mechanism of pollutant degradation , in which the active substance is the highly active metastable intermediate complex (MnO 2 /PI*). Hydroxyl radical (HO • ), superoxide radical (O 2 •− ), singlet oxygen ( 1 O 2 ) and iodine radical (IO 3 • ) did not participate in pollutant degradation. The quantitative structure-activity relationship analysis confirmed that the catalytic performance of MnO 2 was highly positively correlated with the surface Mn(IV) content, which indicated that the surface Mn(IV) site was the main active site. Overall, this study will be of great help to the design and application of manganese dioxide activation for periodate degradation of pollutants.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Huimei Shan,Huinan Mo,Yunquan Liu,Chunya Zeng,Sanxi Peng,Hongbin Zhan
Graphene oxide chitosan composite (GOCS) is recognized as an environmentally friendly composite adsorbent because of its stability and abundant functional groups to adsorb heavy metals, and Fe-Mn binary oxides (FMBO) have attracted increasing interest due to their high removal capacity of As(III). However, GOCS is often inefficient for heavy metal adsorption and FMBO suffers poor regeneration for As(III) removal. In this study, we have proposed a method of dopping FMBO into GOCS to obtain a recyclable granular adsorbent (Fe/Mn GOCS) for achieving As(III) removal from aqueous solutions. Characterization of BET, SEM-EDS, XRD , FTIR , and XPS are carried out to confirm the formation of Fe/Mn GOCS and As(III) removal mechanism. Batch experiments are conducted to investigate the effects of operational factors (pH, dosage, coexisting ions, etc.), as well as kinetic, isothermal, and thermodynamic processes. Results show that the removal efficiency ( R e ) of As(III) by Fe/Mn GOCS is about 96 %, which is much higher than those of FeGOCS (66 %), MnGOCS (42 %), and GOCS (8 %), and it increases slightly with the increasing molar ratio of Mn and Fe. This is because amorphous Fe (hydro)oxides (mainly in the form of ferrihydrite) complexation with As(III) is the major mechanism to remove As(III) from aqueous solutions, and it is accompanied by As(III) oxidation mediated by Mn oxides and the complexation of As(III) with oxygen-containing functional groups of GOCS. Charge interaction plays a weaker role in As(III) adsorption, therefore R e is persistently high over a wide range of pH values of 3–10. But the coexisting PO 4 3− can greatly decrease R e by 24.11 %. As(III) adsorption on Fe/Mn GOCS is endothermic and its kinetic process is controlled by pseudo-second-order with a determination coefficient of 0.95. Fitted by the Langmuir isotherm, the maximum adsorption capacity is 108.89 mg/g at 25 °C. After four times regeneration, there is only a slight decrease of <10 % for the R e value. Column adsorption experiments show that Fe/Mn GOCS can effectively reduce As(III) concentration from 10 mg/L to <10 μg/L. This study provides new insights into binary polymer composite modified by binary metal oxides to efficiently remove heavy metals from aquatic environments.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Man Zhang,Jianping Gao,Wei Hong,Xiaoxue Wang,Qiang Tian,Zhaolin An,Luyao Wang,Hongduo Yao,Yu Liu,Xiaoxiang Zhao,Haixia Qiu
The development of oxygen reaction reduction (ORR) electrocatalysts that are low-cost, highly-active and have long-term stability for use in energy conversion and storage applications such as fuel cells and metal-air batteries is very important. In this paper, a facile one-step pyrolysis method was used to prepare bamboo-like N-doped carbon nanotubes (BNCNTs) as effective ORR electrocatalysts. Manganese and cobalt salts were used as the metal precursors, and urea was the C and N source. The resulting catalysts were characterized by the scanning electron microscopy , high resolution-transmission electron microscopy, X-ray photoelectron spectroscopy, Raman microscopy and X-ray power diffraction. The BNCNTs contained Mn and Co nanoparticles that were coated with graphitic carbon. The electrochemical performances of the catalysts in alkaline media were evaluated using cyclic voltammetry , linear sweep voltammetry and chronoamperometry . The BNCNTs prepared with a Mn to Co molar ratio of 1:1 at 800 °C had the best catalytic activity. The reaction followed a quasi-4 electron reaction pathway with a smaller Tafel slope (57.5 mV dec −1 ) than that of the commercial Pt/C (72.8 mV dec −1 ). In addition, the limiting current density, durability and methanol crossover resistance were all superior to those of Pt/C. The above results indicate that Mn/Co-BNCNTs-800 is an active electrocatalyst with earth-abundant non-precious elements for ORR.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 5
·5094-5110
·
IF 2.914
Zhang Mengjiao,Zhu Liyun,He Changhua,Xu Xiaojun,Duan Zhengyang,Liu Shuli,Song Mingyao,Song Shumin,Shi Jiemei,Li Yu’e,Cao Guangzhu
In this study, the novel adsorbent PVA-TA-βCD was synthesized via thermal cross-linking between polyvinyl alcohol and β-cyclodextrin. The characterization methods SEM-EDS, FTIR, and XPS were adopted to characterize the adsorbent. The effect of pH, contact time, initial concentrations, and temperature during the adsorption of Pb(II), Cd(II), and Mn(II) onto the PVA-TA-βCD was also investigated. In a single-component system, the data fitted well to pseudo-second-order, and film diffusion and intra-particle diffusion both played important roles in the adsorption process. As for isotherm study, it showed a heterogeneous adsorption capacity of 199.11, 116.52, and 90.28 mg g −1 for the Pb(II), Cd(II), and Mn(II), respectively. Competition between the ions existed in a multi-component system; however, owing to the stronger affinity of the PVA-TA-βCD for Pb(II) relative to Cd(II) and Mn(II), the Pb(II) adsorption onto the PVA-TA-βCD was less affected by the addition of the other metals, which could be effectively explained by the hard and soft acid and base theory (HSAB). Furthermore, PVA-TA-βCD showed good reusability throughout regeneration experiments.
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危险品化学品经营许可证（带存储）