ACS Omega
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2020
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IF 2.87
Jiashan Chen,Ge Pu,Jian Li
xMo/TiO2 catalysts (x = 1, 2, 3, and 4%) were prepared using the coprecipitation method in the present study. The coprecipitation method was used in the thermal catalytic decomposition of H2O2 steam to treat NOx at a low temperature range (80–160 °C). Several characterization techniques have been employed, such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller measurements, transmission electron microscopy (TEM), scanning electron microscopy and energy-dispersive X-ray spectrometry (SEM–EDXS), and Fourier transform infrared spectroscopy. The activity tests showed that the incorporation of molybdenum into TiO2 led to a significant increase in the catalytic oxidation of NO, and under the condition of H2O2/NO = 6:1 (molar ratio), the NOx removal rate of 2% Mo/TiO2 is the highest, reaching 92.56%. XRD, TEM, and SEM–EDXS analyses showed that Mo was well dispersed on the surface of an anatase-phase TiO2. XPS analysis indicated that Mo mixed with slag mainly existed in the form of Mo6+. Moreover, in comparison with the mostly reported SCO catalysts, used for the elimination of NO, the prepared Mo/TiO2 catalyst showed excellent stability and sulfur resistance.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Yan Zhou,Jingtong Zhang,Hao Ren,Yuan Pan,Youguo Yan,Fengchao Sun,Xueyuan Wang,Shutao Wang,Jun Zhang
Cation doping into 2D transition metal chalcogenides (TMC) is always interesting and meaningful, due to the possibilities of tuning both the crystal and electronic structures of TMCs. Herein, we used a mixed phase of CoSe/Co 9 Se 8 to facilitate the successful doping of Mo in CoSe crystal lattice. XRD, HRTEM, Raman spectroscopy and EXAFS analyses show a lattice contraction of Mo doped CoSe. Theoretical calculation confirms that Mo doping can lead to the lattice contraction of CoSe, and cause continuity shift of electron density of state toward Fermi level. We also demonstrated in this work, experimentally and theoretically, that the successful tuning of both crystal and electronic structure of CoSe upon on Mo doping leads to enhanced electrocatalytic HER performance in acidic condition. Co 0.8 Mo 0.2 Se showed the best HER activity, with only 186.1 mV overpotential needed to achieve 100 mA cm −2 current density and low Tafel slope of 58.7 mV dec -1 .
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JACS Au
·
2023
·
IF 8
Jiajun Zhang,Kai Feng,Zhengwen Li,Bin Yang,Binhang Yan,Kai Hong Luo
Synthetic fuels produced from CO2 show promise in combating climate change. The reverse water gas shift (RWGS) reaction is the key to opening the CO2 molecule, and CO serves as a versatile intermediate for creating various hydrocarbons. Mo-based catalysts are of great interest for RWGS reactions featured for their stability and strong metal–oxygen interactions. Our study identified Mo defects as the intrinsic origin of the high activity of cluster Mo2C for CO2-selective hydrogenation. Specifically, we found that defected Mo2C clusters supported on nitrogen-doped graphene exhibited exceptional catalytic performance, attaining a reaction rate of 6.3 gCO/gcat/h at 400 °C with over 99% CO selectivity and good stability. Such a catalyst outperformed other Mo-based catalysts and noble metal-based catalysts in terms of facile dissociation of CO2, highly selective hydrogenation, and nonbarrier liberation of CO. Our study revealed that as a potential descriptor, the atomic magnetism linearly correlates to the liberation capacity of CO, and Mo defects facilitated product desorption by reducing the magnetization of the adsorption site. On the other hand, the defects were effective in neutralizing the negative charges of surface hydrogen, which is crucial for selective hydrogenation. Finally, we have successfully demonstrated that the combination of a carbon support and the carbonization process synergistically serves as a feasible strategy for creating rich Mo defects, and biochar can be a low-cost alternative option for large-scale applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Yun Zhang,Shihua Ding,Tianxiu Song,Yingchun Zhang
Temperature stable MO-ZrO 2 -Ta 2 O 5 ceramics (M = Co, Ni) were prepared by solid state route. Crystal structure was determined by X-ray diffraction and Raman spectrum. Single-phase MZrTa 2 O 8 was formed through the reaction between intermediate MTa 2 O 6 and residual ZrO 2 . Quantitative phase analysis verified that changing temperature considerably adjusted the chemical compositions of ceramics. In the case of CoZrTa 2 O 8 , the optimum dielectric properties were ε r ∼24.3, Q × f∼ 95,300 GHz ( Q ∼11,305 at 8.43 GHz), and τ f ∼ -30.50 ppm/°C. The NiZrTa 2 O 8 ceramic had ε r = 23.5, Q × f = 86,404 GHz ( Q ∼10,774 at 8.02 GHz), and τ f = −20.20 ppm/°C. Their large τ f values were compensated since MZrTa 2 O 8 and MTa 2 O 6 had opposite τ f . Particularly, near zero τ f of −2.67 and 0.22 ppm/°C were obtained for M = Co, Ni at 1150 and 1175 °C, respectively.
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MATERIALS SCIENCE FORUM
·
2018
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IF 0
De Zhi Wang,Yu Qing Zhang,Bo Hua Duan
In this work, Molybdenum trioxide and conventional copper particles were used as precursors, reduced in hydrogen atmosphere. Then Cu@Mo Powders were successfully synthesized. Effects of reduction temperature on the microstructure of the composite powders and the performance of the intermediate product (molybdenum dioxide) were investigated. Results show that 700°C is the optimal reduction temperature, because Mo is reduced from its oxide and forms a coating layer on the surface of copper particles tightly without serious crack. Mo-20wt.% Cu composite powders where Cu is coated uniformly with continuous molybdenum layer are successfully obtained by co-reduction method.
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ChemNanoMat
·
2019
·Vol. 5
·期 7
·897-910
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IF 3.431
Yanan Liu,Jing Sun,Youcong Gong,Hui Zhou,Xu Chen,Xufeng Zhu,Yingyu Zhao,Yayu Wen,Xiuying Qin,Jie Liu
Graphical Peptide@POMs nanoparticles with Aβ-targeting peptides are used for Alzheimer's disease treatment in mice. First, synthetic peptide-modified Mo-POM nanoparticles are synthesized. Then, the assembled Peptide@POMs nanoparticles can effectively inhibit Zn 2+ -induced Aβ40 aggregation, penetrate the blood-brain barrier, and bind to Aβ. In addition, Peptide@POMs nanoparticles protect neurons from Aβ40-mediated neurotoxicity. The abnormal metabolism of amyloid-β (Aβ) peptide, as one of the main components of senile plaques, plays a vital role in the pathogenesis of Alzheimer's disease (AD). Our previous work showed that polyoxometalates (POMs) that inhibited the formation of Aβ aggregates were promising for AD therapy. Here, peptide-modified Mo polyoxometalate (Mo-POMs) nanoparticles were synthesized by the self-assembly of Aβ target peptide and Mo-POMs based on our previous work. Importantly, after modifying with the Aβ target peptide, the Mo polyoxometalate (Mo-POMs) nanoparticles exhibited enhanced blood-brain barrier (BBB) penetration and high binding affinity with Aβ species. The interactions between the Peptide@Mo-POMs nanoparticle and Aβ in the presence of Zn 2+ were comprehensively studied using physicochemical methods (spectroscopy, ThT fluorescence, turbidity tests). Peptide@Mo-POMs could suppress Aβ aggregation, disaggregate Aβ fibrils, and suppress Zn 2+ -induced Aβ aggregation. In addition, in vitro cell experiments revealed that Peptide@Mo-POMs could target and be well absorbed by PC12 cells, leading to the inhibition of intracellular Aβ aggregation and reduced Aβ aggregates-induced cytotoxicity. The blood-brain barrier (BBB) permeability of Peptide@Mo-POMs was also revealed by the Transwell experiment. This study gives a mechanistic understanding into how Peptide@Mo-POMs can work through a synergistic interaction with metal ions and Aβ, and provides new insights into the design and synthesis of POMs as Aβ inhibitors in the treatment of AD.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Shengguo Zhang,Xiaodong Wang,Qiuye Li,Jianjun Yang
In this paper, V-Mo co-doped akaganeite (β-FeOOH) was prepared by one-pot hydrothermal method and the oxidative desulfurization (ODS) of dibenzothiophene over the catalyst was carefully investigated. 0.07 g (ca. 0.35 wt% of model oil) of catalyst induced 100 % of DBT removal in 60 min with a O/S of 20:1 under 60 °C for the model oils with any of the sulfur contents, 100 ppm, 500 ppm, or 1000 ppm. Moreover, the DBT removal after recycling 4 times is still 100 % and it only declines to 98.04 % in the fifth cycle, which indicates that the catalyst has a good stability and recycling performance. Doping V species in Mo doped β-FeOOH not only initiates a micro-variation in catalyst structure and the resultant more active •OH species but also forms a more stable structure of the catalyst, enabling the catalyst to exhibit a higher ODS reaction rate and a better reusability. The GC-MS analyses demonstrated that the DBT was converted to DBTO 2 by two steps: (1) DBT→ DBTO; (2) DBTO→ DBTO 2 , and the former is the rate-limiting step.
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Current Nanoscience
·
2015
·Vol. 11
·期 2
·198-205
·
IF 1.096
Yang Rong Yao,Rong Bin Huang,Huan Zhou,Wan Zhen Huang,Yong Zhang,Xu Chun Song
The ZnWO4 photocatalysts doped with different molar ratios of molybdenum ions have been successfully prepared by a facile and effective hydrothermal method. The photocatalytic activities of the as-prepared products were evaluated by the degradation of rhodamine B (RhB) in aqueous solution. The result showed that with the doping of molybdenum ions, the photocatalytic activity of the Mo-doped ZnWO4 photocatalysts were greatly improved. In addition, the best photoactivity was acquired when the Mo-doping molar ratio is 0.05. The doping effects on the properties of ZnWO4 nanoparticles such as particle size, specific surface area, band gap and the photocatalytic performance were systematically discussed.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Wenjing Li,Xuelin Dong,Lihua Zhu,Heqing Tang
It is urgently needed to develop highly efficient and selective adsorbents for enrichment and separation of Re(VII) from Mo(VI) to obtain metallic rhenium. By tuning cross-link of chitosan, ionic gel capsules (CSN) were prepared, which had a core-shell structure and wrapped N263 (methyl trioctyl ammonium chloride) as an extractant. After being characterized, the CSN capsules were used as a green adsorbent for separation of ReO 4 − from MoO 4 2− . It was found that the gel yielded good adsorption capacities for Re(VII) in a wide pH range from pH 2 to 12. The adsorption of Re(VII) on the gel followed the Langmuir model, exhibiting a maximum adsorption capacity of 222 mg g −1 for Re. The adsorbent showed good adsorption capacities for Mo(VI) at pH < 2, but little at pH > 3.5. Therefore, the enrichment and separation of Re(VII) from Mo(VI) could be easily achieved by using the gel adsorbent in a wide pH range from 4 to 12, showing a separation factor β Re/Mo with values of 10 3 –5 × 10 4 . A mechanism was proposed for the selective adsorption of Re(VII). The extractant N263 wrapped in the capsule core provides excellent extractive adsorption ability for Re(VII) through ion association extraction, generating ion association complex R 4 N + ∙ReO 4 − in the adsorbent. The gel shell was composed of cross-linked chitosan induced by sodium tripolyphosphate, and functioned as a blocking layer for the adsorption of Mo(VI), being possibly related to a special interaction between Mo and P as observed in the formation of phosphorus molybdenum heteropolyacid and/or the crosslinking with Mo and chitosan. The CSN gel was successfully applied to separate ReO 4 − from a practical alkaline solution.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Meifei Chen,Xiunan Cai,Qing Yang,Wenqin Lu,Zuqiang Huang,Tao Gan,Huayu Hu,Yanjuan Zhang
To improve the photocatalytic performance of g-C 3 N 4 (CN), mechanical activation (MA) treatment of precursor followed by calcination was developed to construct a N−Mo−O bond bridged MoO 2 /Mo-doped CN (MA-MoO 2 /Mo-CN) Schottky heterojunction composite, which was used as a visible light-driven photocatalyst for degrading tetracycline (TC). The as-prepared MA-MoO 2 /Mo-CN with strong interfacial interaction showed excellent photocatalytic performance and structural stability, with 92.3% of TC degradation efficiency within 90 min and maintaining over 90% of degradation efficiency after five consecutive cycles. The enhanced photocatalytic performance can be ascribed to that MA treatment induced the improvement of surface area and the formation of N vacancies and N−Mo−O bonds, which served as a bridge to connect Mo-CN and MoO 2 for constructing a Schottky barrier. These provided more reactive sites and effectively enhanced migration efficiency of interface electrons, separation efficiency of photogenerated carriers, and light absorption capacity. In addition, the mechanism of photocatalytic degradation of TC and its possible degradation pathway were investigated. This research provides an environmentally friendly and feasible method for producing highly active precious metal-free photocatalysts with excellent migration and separation efficiency of photoexcited charge carriers.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Wei Liu,Yaxuan Li,Yuanxin Dou,Nuo Xu,Jiajia Wang,Jiangtao Xu,Chuanming Li,Jingquan Liu
Designing cost-effective alkaline hydrogen evolution reaction (HER) catalysts with high water dissociation ability, enhanced hydroxyl transfer rate and optimized hydrogen adsorption free energy (ΔG H* ) by a time and energy efficient strategy is pivotal, but still challenging for alkaline water electrolysis. Herein, Pt/Mo-NiO x hybrid consisting of Pt clusters assembled on Mo-doped NiO x nanosheet arrays is prepared on the surface of raw NiMo foam (NMF) by a light-driven strategy to address this challenge. Benefitting from the electronic interaction between Mo-NiO x and Pt, the Pt/Mo-NiO x composite owns optimized ΔG H* and is beneficial for accelerating water dissociation and hydroxyl transfer. As a result, the optimized Pt/Mo-NiO x /NMF electrode displays an exceptional alkaline HER activity with a low overpotential of 62 mV to obtain 100 mA cm −2 and a high Pt mass activity (13.2 times as high as that of commercial 20 wt% Pt/C). Furthermore, the assembled two-electrode cell of Pt/Mo-NiO x /NMF||NiFe-LDH/NF requires a voltage of only 1.549 V to deliver 100 mA cm −2 , along with negligible activity decay after 70 h stability test. The present study provides a promising strategy for exploiting high-performance electrocatalysts towards alkaline HER.
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MATERIALS CHARACTERIZATION
·
2023
·
IF 4.7
Weiqiang Hu,Jun He,Zhenwen Yang,Jing Tan,Songhua Chen,Shaocun Liu,Zongqing Ma,Yongchang Liu
The little TiC was added into Mo alloys by facile ball milling and subsequent sintering. Interestingly, ultrafine Mo-TiC alloy (6.53 μm) possesses quasi-cleavage transgranular fracture morphology, which is differed from traditional intergranular fracture morphology of oxide-dispersion-strengthened molybdenum (ODS-Mo) alloy. The alloy interface with the lowest strength changes from Mo grain boundaries (GBs) to grain interior, hence the crack propagates along grain interior. For one thing, some C-deficient TiC (Ti 8 C 5 ) can adsorb adjacent impurity oxygen at sintering stage to generate in-situ TiO x , thereby purifying Mo matrix. For another thing, coherent interfaces between TiC/TiO x particles and Mo further strengthen Mo matrix. Moreover, a lot of TiC/TiO x particles within Mo grains could efficaciously accumulate dislocations and indirectly improve GBs strength. Compared to ball-milled Mo or ODS-Mo alloy reported in literatures, the sintered Mo-TiC alloys in present work possess a high hardness (468 HV 0.2 ), an excellent match of high strength (1287.3 MPa) and large ductility (18.1%).
研究领域:
材料科学
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冶金学
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机械工程
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