ACS Applied Nano Materials
·
2020
·
IF 0
Jianhong Yang,Zhiyong Song,Jun Ma,Heyou Han
With the rapid development of nanotechnology, molybdenum (Mo)-based nanomaterials have been widely used in various fields, and the ensuing environmental behavior has also raised widespread concern. Here, we report the nanotoxic effects and mechanism of nano-Mo treatment on the soybean–rhizobia symbiotic system in the sterilized mixture of sand and vermiculite environment. Exposure to different concentrations and types of Mo-based nanomaterials was shown to have significant physiological and biochemical toxicity to soybean. The accumulation of Mo in plant tissues increased with the concentration of nano-Mo in the sand and vermiculite media. The Mo-based nanomaterials that enter plant tissues were found to affect not only the growth and development of plants, but also the microstructure of the roots and the activity of rhizobium in the symbiotic system, thereby weakening the nitrogen fixation capacity of the soybean–rhizobia symbiotic system. Meanwhile, the activity of superoxide dismutase (SOD) and peroxidase (POD) showed a significant increase, indicating that these enzymes were activated after exposure to nano-Mo, which helps to remove the reactive oxygen species. Furthermore, the treatment of high-concentration Mo nanoparticles was shown to have obvious epigenetic toxicity to plants. These results demonstrate that high concentrations of Mo nanoparticles can affect the agronomical and physiological parameters in soybean, which may impact human nutrition and health.
研究领域:
植物学
·
环境科学
·
分子生物学
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jingfan Zhang,Min Zhao,Yubo Zhao,Jingkun Wang,Yanxia Wu,Kexun Li,Ying Liu
Molybdenum disulfide (MoS 2 ) has been considered as an excellent candidate for microwave absorption applications due to its appropriate electrical conductivity and large area size. However, the absorption efficiency and absorption bandwidth of single-phase MoS 2 nanocomposites have been limited due to the weak electrical conductivity and magnetism . This paper proposes a feasible strategy to optimize the electromagnetic properties of MoS 2 absorbent by Fe-doping. The MoS 2 nanosheets with different Fe concentration have been synthesized a microwave-assisted hydrothermal process. Microstructure characterizations reveal that Fe dopants can facilitate the formation mixed 1T/2H phase MoS 2 nanosheets. Owing to the improved permittivity and permeability properties, impedance matching, as well as attenuation characteristics originated from the doping effect and partial phase transformation, the Fe-doped 1T/2H-MoS 2 nanosheets exhibit excellent electromagnetic wave absorbing properties. Its maximum reflection loss reaches − 60.03 dB at the matching thickness of 5.65 mm, and the effective absorption bandwidth below − 10 dB is 5.33 GHz. Such novel doping strategy provides a new insight for design and controlling the magneto-dielectric properties of MoS 2 nanostructures .
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Micro & Nano Letters
·
2019
·Vol. 14
·期 5
·493-495
·
IF 0.975
Qinghua Yang,Chunni Xiao,Bingbing Chen,Lin Ma,Limei Xu
MoS 2 hierarchical nanoflowers are fabricated through a gelatin-assisted hydrothermal route. The obtained MoS 2 products are characterised by X-ray powder diffraction, scanning electronic microscopy, transmission electronic microscopy and X-ray photoelectron spectra. It is indicated that MoS 2 nanoflowers (MoS 2 NFs) are assembled by nanosheets as building blocks and gelatin plays a crucial role in the formation of these novel structures. Moreover, MoS 2 NF electrode exhibits an enhanced capacitive property because of its unique microstructure.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2021
·Vol. 34
·期 4
·413-418
·
IF 1.114
Niu Xiao-you,Jiang Shen-long,Zhang Qun
Photocatalytic N 2 fixation has attracted substantial attention in
recent years, as it represents a green and sustainable development route toward
efficiently converting N 2 to NH 3 for industrial
applications. How to rationally design catalysts in this regard remains a
challenge. Here we propose a strategy that uses plasmonic hot electrons in the
highly doped TiO 2 to activate the inert N 2 molecules. The
synthesized semiconductor catalyst Mo-doped TiO 2 shows a
NH 3 production efficiency as high as 134
µmol · g −1 · h −1 under
ambient conditions, which is comparable to that achieved by the conventional
plasmonic gold metal. By means of ultra-fast spectroscopy we reveal that the
plasmonic hot electrons in the system are responsible for the activation of
N 2 molecules, enabling improvement the catalytic activity of
TiO 2 . This work opens a new avenue toward semiconductor
plasmon-based photocatalytic N 2 fixation.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 21
·7447
·
IF 4.927
Tian Chang,Di Qu,Bao Li,Lixin Wu
Vanadomolybdates (VMos), comprised of Mo and V in high valences with O bridges, are one of the most important types of polyoxometalates (POMs), which have high activity due to their strong capabilities of gaining/losing electrons. Compared with other POMs, the preparation of VMos is difficult due to their relatively low structural stability, especially those with unclassical architectures. To overcome this shortcoming, in this study, triol ligands were applied to synthesize VMos through a beaker reaction in the presence of V2O5, Na2MoO4, and organic species in the aqueous solution. The single-crystal X-ray diffraction results indicate that two VMo clusters, Na4{V5Mo2O19[CH3C(CH2O)3]}∙13H2O and Na4{V5Mo2O19[CH3CH2C(CH2O)3]}∙13H2O, with a similar architecture, were synthesized, which were both stabilized by triol ligand and {MoO6} polyhedron. Both clusters are composed of five V ions and one Mo ion in a classical Lindqvist arrangement with an additional Mo ion, showing an unprecedented hepta-nuclear VMo structure. The counter Na+cations assemble into one-dimensional channels, which facilitates the transport of protons and was further confirmed by proton conductivity experiments. The present results provide a new strategy to prepare and stabilize VMos, which is applicable for developing other compounds, especially those with untraditional architectures.Keywords:polyoxometalate;vanadomolybdate;triol ligand;covalent modification
研究领域:
无机化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Russian Journal of Physical Chemistry A
·
2018
·Vol. 92
·期 7
·1274-1278
·
IF 0.549
Xiaomeng Liu,Lu Shaoxiang,Xu Hanghui,Ren Lili
Abstract Molybdenum phosphide (MoP), modified by polyethylene glycol (PEG) and citric acid (CA), exhibited 2 to 3 times superior activity than the MoP modified by CA alone. And the optimal activity temperature was reduced from 500 to 450 o C. The catalyst was fully characterized by a variety of techniques including X-ray diffraction (XRD), N 2 adsorption-desorption isotherm, scanning electron microscopy (SEM), transmission electron microscopy (TEM). The results showed that the addition of PEG and CA increased the surface area of MoP and decreased the particle size of MoP. Furthermore, the reaction mechanism also has been discussed by combining the activity data and characterization results.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2018
·Vol. 48
·期 1
·603-610
·
IF 1.566
Ao Y. C.,Shi Y.,Zhao C. Z.,Huang Y.,Shi J. Q.,Zhou K. R.,Zhou Q. J.,Li Z. P.,Wei T.
An effective route to regulate up-conversion luminescence (UCL) and polarization properties has been developed in tetragonal tungsten bronze ferroelectrics (TTBs). In this work, we have synthesized a series of (Sr 0.29 Er 0.01 )Ba 0.7 Nb 2− x Mo x O 6 (SBN-A x , 0 ≤ x ≤ 0.1) and Sr 0.3 Ba 0.7 (Nb 1.99− x Mo x Er 0.01 )O 6 (SBN-B x , 0 ≤ x ≤ 0.1) ceramics. Through investigating the UCL spectra of SBN-A x and SBN-B x ceramics, markedly different enhancement effects of UCL intensity have been revealed which can be attributed to the peculiar structural feature of TTBs. Furthermore, temperature sensing, dielectric and ferroelectric properties have also confirmed to display B -site substitution-dependent intriguing behaviors.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Cong Chen,Ganhua Qiu,Ting Wang,Ziqiang Zheng,Mengtian Huang,Benxia Li
Photocatalytic selective oxidation of alcohols into high value-added carbonyl compounds accompanied by producing hydrogen peroxide (H 2 O 2 ) is undoubtedly a more efficient solar energy conversion strategy with high atom economy. Herein, we have developed an efficient photocatalyst of bismuth-molybdate (Bi 2 MoO 6 ) hierarchical hollow microspheres with tunable surface oxygen vacancies (OVs) for promoting the photocatalytic selective alcohol oxidation with H 2 O 2 production. The effect of surface OVs on the photocatalytic efficiency is studied systematically by comparing the performance of different photocatalysts. The benzaldehyde and H 2 O 2 production rates over the OV-rich Bi 2 MoO 6 photocatalyst reach up to 1310 and 67.2 μmol g −1 h −1 , respectively, which are 2.3 and 4.0 times those generated from the OV-poor Bi 2 MoO 6 hollow microspheres. The roles of various active radicals in the photocatalytic reaction are probed by a series of controlled experiments and in situ ESR measurements, revealing that both superoxide radical (• O 2 - ) and carbon-centered radical are the key active intermediates. The introduction of surface OVs on Bi 2 MoO 6 hollow microspheres accelerates the separation and transfer of photo-generated charge carriers as well as enhances the adsorption and activation of reactant molecules, thereby greatly promoting the photocatalytic selective oxidation of alcohols along with H 2 O 2 production. This work not only demonstrates a facile strategy for the preparation of high-efficiency photocatalysts by simultaneous modulations of morphology and surface defects , but also offers insight into developing the dual-functional photocatalytic reactions for the full utilizations of photoinduced electrons and holes.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 9
·期 1
·165-178
·
IF 6.569
Ning Yang,Linjie Lu,Linhua Zhu,Peiwen Wu,Duanjian Tao,Xiaowei Li,Jiahong Gong,Linlin Chen,Yanhong Chao,Wenshuai Zhu
Porous ionic liquids (PILs), with permanent porosity and fluidity, have been drawing great attention in theoretical research and application. Herein, a novel PIL (HPMo@ZIF-8-PIL) was fabricated by dispersing a phosphomolybdic acid-modified zeolitic imidazolate framework-8 (ZIF-8) into an ionic liquid for deep reactive extraction desulfurization. Size calculation results show that 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonylimide) ([Emim][NTf2]) with larger ion sizes cannot occupy pores of ZIF-8. In detail, the structure along with permanent porosity was well characterized by gas absorption and molecule displacement experiments, and it was found that HPMo@ZIF-8-PIL can not only promote the dispersion of the catalytically active sites but also retain the good liquidity and excellent extraction ability of ionic liquids. At room temperature, 100% removal of dibenzothiophene sulfur in a model oil could be achieved within 2 h using HPMo@ZIF-8-PIL and hydrogen peroxide as the catalyst and oxidant, respectively. Besides, the successful preservation of porosity increases the probability of contact between the oxidant and active sites, which is also in favor of the promotion of desulfurization performance. This work offers a new method for the modification of porous frameworks to construct PIL catalysts, which will provide a new insight into the application of PILs.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Weibo Huang,Zhouyu Tong,Yuxin Bi,Mingliang Ma,Zijian Liao,Guanglei Wu,Yong Ma,Siyu Guo,Xiaoyu Jiang,Xueping Liu
Herein, coralloid core-shell structure NiS/Ni 3 S 4 @PPy@MoS 2 nanowires were elaborately designed and successfully synthesized through a three-step route to obtain exceptional microwave absorption (MA) properties. Ni nanowires were first fabricated, and then used as the substrate to be coated with a layer of PPy . Ni chalcogenides were obtained by using Ni nanowire as sacrificial templates while growing MoS 2 nanorods by hydrothermal method . Both the one-dimensional (1D) core-shell structure and the coralloid surface generated by MoS 2 nanorods were beneficial for the attenuation of microwaves. After investigating the electromagnetic properties of different loading content absorbers (30 wt.%, 40 wt.% and 50 wt.%), it is found that the 50 wt.% loading absorber has the optimal MA performance. The minimum reflection loss (RL min ) value can reach −51.29 dB at 10.1 GHz with a thickness of 2.29 mm, and the corresponding effective absorption bandwidth (EAB, RL < −10 dB) can be up to 3.24 GHz. This research provides a reference for exploiting novel high-efficient 1D absorbers in the field of MA.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2014
·
IF 10.211
Xu Xiao,Zehua Peng,Chi Chen,Chuanfang Zhang,Majid Beidaghi,Zhenhua Yang,Nan Wu,Yunhui Huang,Ling Miao,Yury Gogotsi,Jun Zhou
Molybdenum trioxide (MoO 3 ) is known as a promising pseudocapacitive material, but low conductivity limits its applications. Hydrogenation is demonstrated to increase the conductivity of MoO 3 and hence improve its electrochemical performance. Hydrogenated MoO 3 (MoO 3− x ) shows enhanced conductivity based on, both first principle calculations and single nanobelt measurements. Freestanding MoO 3− x /carbon nanotubes (CNT) composite films have been fabricated and showed much improved electrochemical performance compared to composites of CNT and as-synthesized MoO 3 (MoO 3 /CNT). Electrodes showed a specific capacitance of 337 F/g (based on the mass of MoO 3− x ) and a high volumetric capacitance of 291 F/cm 3 (based on the whole electrode) with excellent rate capability. Also we confirmed that the improved intercalation kinetics and the increased intercalation pseudocapacitance could be attributed to the higher electronic conductivity of MoO 3− x , which results in better and faster intercalations of Li + ions. This electrochemical behavior implies that MoO 3− x can serve as a very good negative electrode with high capacitance at high mass loading levels.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 34
·19831-19837
·
IF 10.733
Xiang-Wei Guo,Shuang-Ming Chen,Hong-Juan Wang,Zhi-Ming Zhang,Hong Lin,Li Song,Tong-Bu Lu
A series of Mo single-atom catalysts were prepared by calcining a low-cost primary material of urea with various amounts of Na2MoO4·2H2O. Isolated Mo centers are immobilized on in situ formed polymeric carbon nitride via coordinating with two N donors to form two-coordinated MoN2 species. The low-coordinated Mo centers can serve as active sites for N2 chemisorption and activation, achieving high photocatalytic activity for NH3 evolution with a rate of 50.9 μmol gcat−1 h−1 in pure water. In the presence of ethanol as the electron scavenger, the NH3 evolution rate can reach 830 μmol gcat−1 h−1, and the catalyst shows a quantum efficiency of 0.70% at 400 nm. This is the first single-atom catalyst that can drive photocatalytic N2 fixation in pure water with comparable performance to recent reports for photocatalytic N2 reduction. Experimental investigations and density functional theory calculations demonstrate that the coordinatively unsaturated metal center in the single-atom catalysts can strongly adsorb N2via an end-on configuration to elongate the NN bond from 1.11 Å to 1.15 Å, and thus photoexcited electrons can transfer to the weakened NN bond for efficient nitrogen fixation under ambient conditions. These findings provide new insight for solar-driven N2 fixation by atomically dispersing low-coordination metal centers on photoactive supports.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）