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Tatyana S Spiridonova, Sergey F Solodovnikov, Aleksandra A Savina, Yulia M Kadyrova, Zoya A Solodovnikova, Vasiliy N Yudin, Sergey Yu Stefanovich, Elena G Khaikina
A new triple molybdate, Rb2 Ag1+3x In1-x (MoO4 )3 (0 ≤ x ≤ 0.02), was found in the course of a study of the system Rb2 MoO4 -Ag2 MoO4 -In2 (MoO4 )3 and was synthesized as both powders and single crystals by solid-state reactions and spontaneous crystallization from melts. The structure of Rb2 Ag1+3x In1-x (MoO4 )3 (x ≉ 0.004) is of a new type crystallizing in the centrosymmetric space group R-3c [a = 10.3982 (9), c = 38.858 (4) Å, Z = 12 and R = 0.0225] and contains (In,Ag)O6 octahedra and distorted Ag1O6 trigonal prisms linked by common faces to form [Ag(In,Ag)O9 ] dimers connected to each other via MoO4 tetrahedra into an open three-dimensional (3D) framework...
December 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
Jared M Robertson, Jake A Nesbitt, Matthew B J Lindsay
Fluid petroleum coke generated at oil sands operations in the Athabasca Oil Sands Region of northern Alberta, Canada, contains elevated concentrations of molybdenum (Mo) and other metals including nickel (Ni) and vanadium (V). Solid-phase Mo concentrations in fluid petroleum coke are typically 10 to 100 times lower than V and Ni, yet dissolved Mo concentrations in associated pore waters are often comparable with these metals. We collected pore water and solids from fluid petroleum coke deposits in the AOSR to examine geochemical controls on Mo mobility...
November 12, 2018: Chemosphere
J V B Moura, T S Freitas, R P Cruz, R L S Pereira, A R P Silva, A T L Santos, J H da Silva, C Luz-Lima, H D M Coutinho
This study reports the antibacterial properties and modulation analysis of antibiotic activity by NaCe(MoO4 )2 microcrystals as well as their structural and morphological characterization. Evaluation of the antibacterial and antibiotic-modulating activity was carried out using the broth microdilution method. The Minimum Inhibitory Concentrations (MICs) of the compounds were expressed as the geometric mean of the triplicate values obtained through the use of Resazurin. Compound concentrations in the plates ranged from 512 to 0...
November 13, 2018: Microbial Pathogenesis
Yida Xu, Teng Chen, Tao Wang, Jie Yang, Yan Zhu, Weiping Ding
The catalysts towards the oxygen reduction reaction (ORR) are the key materials for fuel cells and have stimulated continuous investigations on rational designs. Apart from the popular strategies reported, we demonstrate here a facile method resulting in a nanocomposite composed of molybdenum carbide (Mo2C) nanoparticles embedded and buried in Fe-N-doped carbon nanolayers by directly pyrolyzing the mixture of Fe2(MoO4)3 and dicyandiamide. The underlying Mo2C donates electrons of higher energy to the exterior N-containing carbon nanolayers (NC) and strongly couples with the active sites induced by Fe in the NC layer, leading to significant improvement at half-wave potential with respect to the control sample without Mo2C...
November 29, 2018: Nanoscale
Bougar Sarr, Abdou Mbaye, Cheikh Abdoul Khadir Diop, Frederic Melin, Petra Hellwig, Mamadou Sidibé, Yoann Rousselin
The organic-inorganic title salt, (C6 H16 N)2 [MoO4 ] or ( i Pr2 NH2 )2 [MoO4 ], was obtained by reacting MoO3 with diiso-propyl-amine in a 1:2 molar ratio in water. The molybdate anion is located on a twofold rotation axis and exhibits a slightly distorted tetra-hedral configuration. In the crystal structure, the diiso-propyl-ammmonium ( i Pr2 NH2 )+ cations and [MoO4 ]2- anions are linked to each other through N-H⋯O hydrogen bonds, generating rings with R 12 12 (36) motifs that give rise to the formation of a three-dimensional network...
November 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
Xiaoxian Zhao, Jiangyan Wang, Ranbo Yu, Dan Wang
Multi-shelled binary metal oxide which can exert a synergetic effect of different oxides, is promising electrochemical electrode material. However, it is challenging to synthesize this kind of binary metal oxides due to the severe hydrolysis and/ or precipitation reactions of the precursors between cations and anions of different metals. Herein, by using citric acid as chelating agent to inhibit the hydrolysis and precipitation reactions, a series of multi-shelled binary metal oxide hollow spheres (Fe2 (MoO4 )3 , NiMoO4 , MnMoO4 , CoWO4 , MnWO4 , etc...
November 15, 2018: Journal of the American Chemical Society
Jie Cheng, Lili Xue, Min Zhu, Jiayin Feng, Jue Shen-Tu, Jianming Xu, Philip C Brookes, Caixian Tang, Yan He
An anaerobic incubation was launched with varying nitrate (1, 5, 10 and 20 mM exogenous NaNO3 ) and molybdate (20 mM Na2 MoO4 , a sulfate-reducing inhibitor) additions to investigate the characteristics of PCP dechlorination, as well as the reduction of natural co-occurring electron acceptors, including NO3 - , Fe(III) and SO4 2- , and the responses of microbial community structures under a unique reductive mangrove soil. Regardless of exogenous addition, nitrate was rapidly eliminated in the first 12 days...
January 2019: Environmental Pollution
Li Wang, Yuanchuan He, Yanlin Mu, Mengjiao Liu, Yuanfu Chen, Yan Zhao, Xin Lai, Jian Bi, Daojiang Gao
A facile sol-gel process was used for synthesis of LiFe(MoO4 )2 microcrystals. The effects of sintering temperature on the microstructures and electrochemical performances of the as-synthesized samples were systematically investigated through XRD, SEM and electrochemical performance characterization. When sintered at 650°C, the obtained LiFe(MoO4 )2 microcrystals show regular shape and uniform size distribution with mean size of 1-2 μm. At the lower temperature (600°C), the obtained LiFe(MoO4 )2 microcrystals possess relative inferior crystallinity, irregular morphology and vague grain boundary...
2018: Frontiers in Chemistry
Maria Väätäjä, Hanna Kähäri, Katja Ohenoja, Maciej Sobocinski, Jari Juuti, Heli Jantunen
This paper presents for the first time the fabrication of dielectric ceramic parts by 3D printing without sintering. The printable paste was prepared by mixing a carefully selected amount of water-soluble Li2 MoO4 powder with water. A viscous mixture of solid ceramic particles and saturated aqueous phase was formed with a solid content of 60.0 vol.%. Printing of the sample discs was conducted with material extrusion using a low-cost syringe-style 3D printer. The consolidation and densification of the printed parts occurred during both printing and drying of the paste due to extrusion pressure, capillary forces, and recrystallization of the dissolved Li2 MoO4 ...
October 29, 2018: Scientific Reports
Juliane Poppe, Steffen Brünle, Ron Hail, Katharina Wiesemann, Klaus Schneider, Ulrich Ermler
A continuous FeMo-cofactor supply for nitrogenase maturation is ensured in Azotobacter vinelandii by developing a cage-like molybdenum storage protein (MoSto) capable to store ca. 120 molybdate molecules (MoO4 2- ) as discrete polyoxometalate (POM) clusters. To gain mechanistic insight into this process MoSto was characterized by Mo and ATP/ADP content, structural and kinetic analysis. We defined three functionally relevant states specified by the presence of both ATP/ADP and POM clusters (MoStofunct ), of only ATP/ADP (MoStobasal ) and of neither ATP/ADP nor POM clusters (MoStozero ), respectively...
October 27, 2018: FEBS Journal
István E Sajó, László P Bakos, Imre M Szilágyi, György Lendvay, József Magyari, Miklós Mohai, Ágnes Szegedi, Attila Farkas, Anna Jánosity, Szilvia Klébert, László Kótai
[NH4 Cu(OH)MoO4 ] as active photocatalyst in the decomposition of Congo Red when irradiated by UV or visible light has been prepared in an unusual ammonia/water ligand exchange reaction of [tetraamminecopper(II)] molybdate, [Cu(NH3 )4 ]MoO4 . [Cu(NH3 )4 ]MoO4 was subjected to moisture of open air at room temperature. Light blue orthorhombic [Cu(NH3 )(H2 O)3 ]MoO4 was formed in 2 days as a result of an unexpected solid/gas phase ammonia-water ligand exchange reaction. This complex does not lose its last ammonia ligand on further standing in open air; however, a slow quasi-intramolecular (self)-protonation reaction takes place in 2-4 weeks, producing a yellowish-green microcrystalline material, which has been identified as a new compound, [NH4 Cu(OH)MoO4 ], ( a = 10,5306 Å, b = 6...
November 5, 2018: Inorganic Chemistry
J V B Moura, C Luz-Lima, G S Pinheiro, P T C Freire
Temperature-dependent Raman spectroscopic study has been performed on scheelite-type sodium‑cerium molybdate - NaCe(MoO4 )2 - in the temperature range 113-873 K. This study provides phonon properties of NaCe(MoO4 )2 , which are very important to understand the mechanism governing eventual phase transitions undergone by the structure, since phonons are very sensitive to structural changes. The ambient scheelite phase remains stable in a low-temperature range (113-293 K), and no relevant modification is observed in the Raman spectra...
February 5, 2019: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Xiaoxuan Ge, Brian J Vaccaro, Michael P Thorgersen, Farris L Poole, Erica L Majumder, Grant M Zane, Kara B De León, W Andrew Lancaster, Ji Won Moon, Charles J Paradis, Frederick von Netzer, David A Stahl, Paul D Adams, Adam P Arkin, Judy D Wall, Terry C Hazen, Michael W W Adams
Anthropogenic nitrate contamination is a serious problem in many natural environments. Nitrate removal by microbial action is dependent on the metal molybdenum (Mo), which is required by nitrate reductase for denitrification and dissimilatory nitrate reduction to ammonium. The soluble form of Mo, molybdate (MoO4 2- ), is incorporated into and adsorbed by iron (Fe) and aluminum (Al) (oxy)hydroxide minerals. Herein we used Oak Ridge Reservation (ORR) as a model nitrate-contaminated acidic environment to investigate whether the formation of Fe- and Al- precipitates could impede microbial nitrate removal by depleting Mo...
October 5, 2018: Environmental Microbiology
Wentao Dang, Xiaoya Wang, Jiayi Li, Cuijun Deng, Yaqin Liu, Qingqiang Yao, Liming Wang, Jiang Chang, Chengtie Wu
When osteochondral tissues suffer from focal or degenerative lesions caused by trauma or disorders, it is a tough challenge to regenerate them because of the limited self-healing capacity of articular cartilage. In this study, a series of Mo-doped bioactive glass ceramic (Mo-BGC) scaffolds were prepared and then systematically characterized. The released MoO4 2- ions from 7.5Mo-BGC scaffolds played a vital role in regenerating articular cartilage and subchondral bone synchronously. Methods: The Mo-BGC scaffolds were fabricated through employing both a sol-gel method and 3D printing technology...
2018: Theranostics
Mosab Kaseem, Young Gun Ko
A novel composite system composed of zirconia and double hydroxide layers (LDHs) was successfully fabricated on the plasma electrolysis (PE) coating. For this aim, the molybdate-loaded LDHs film grown on the PE film of aluminum alloy was modified additionally by zirconia nanoparticles via a facile dip-coating method. The MoO4 2- anions which were obtained by anion exchange process from the precursor CeMgAl-LDH film, led to decrease the distance between the flakes of LDHs film where a flower-like structure was successfully developed...
December 2018: Ultrasonics Sonochemistry
T S Freitas, F S Oliveira, R P Cruz, R L S Pereira, A R P Silva, J V B Moura, C Luz-Lima, B C Viana, J H da Silva, P T C Freire, H D M Coutinho
In this study, we report the antibacterial activity and modulation of antibiotic activity by Fe2 (MoO4 )3 microstructures obtained by the hydrothermal route without use of surfactants or organic additives. This material was characterized by X-ray diffraction (XRD), Raman spectroscopy and scanning electron microscopy (SEM) images. The XRD pattern showed that the Fe2 (MoO4 )3 crystallize in a monoclinic structure without secondary phases. Raman spectroscopy confirms the formation of Fe2 (MoO4 )3 . SEM images show that the Fe2 (MoO4 )3 obtained have ball-of-yarn shaped morphology...
October 15, 2018: European Journal of Pharmaceutical Sciences
Yingcong Xie, Youzhi Dai, Xingzhong Yuan, Longbo Jiang, Lulu Zhou, Zhibin Wu, Jin Zhang, Hou Wang, Ting Xiong
A facile deposition-precipitation method was applied to synthesize novel plasmonic Z-scheme Ag2 MoO4 /Ag3 VO4 photocatalysts with different molar ratios of Ag2 MoO4 . The morphological, structural, and spectroscopic properties of the as-obtained samples were characterized through X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectral analysis. The photocatalytic performance of the synthesized photocatalysts in rhodamine B (RhB) degradation under visible light irradiation was evaluated...
November 15, 2018: Journal of Colloid and Interface Science
Min Wang, Patrick Simon, Liming Lu, Alexander A Sobol, Jian Wang, Songming Wan, Jinglin You
The quantitative distribution of different species ( Q i jklm and H i jklmno ) in binary potassium molybdate melts has been investigated by in situ high temperature Raman spectroscopy in conjunction with quantum chemistry (QC) ab initio calculations. The symmetric stretching vibrational wavenumbers of molybdenum nonbridging oxygen bonds in high wavenumber range and their respectively corresponding Raman scattering cross sections were determined and analyzed. Deconvolution of the stretching bands of molybdenum nonbridging oxygen bonds of molten Raman spectra by using the Voigt function was carried out...
August 7, 2018: Analytical Chemistry
Yang Ding, Jie Liu, Ming Zeng, Xishu Wang, Junli Shi, Weili Wang, Yanru Miao, Xibin Yu
Rare earth (RE3+)-doped NaY(MoO4)2 nanocrystals are efficient materials for realizing multicolor emission, which plays an important role in displays, W-LEDs, solar cells and biolabeling. Up to now, research on the multicolor tuning properties of RE3+-doped NaY(MoO4)2 nanoparticles has mostly focused on traditional preparation routes such as the hydrothermal method and sol-gel process. However, the products obtained using these methods are usually large in size (on the micron/submicron scale) and agglomeration problems are inevitable...
July 3, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Jian Lin, Hongliang Bao, Meiying Qie, Mark A Silver, Zenghui Yue, Xiaoyun Li, Lin Zhu, Xiaomei Wang, Linjuan Zhang, Jian-Qiang Wang
Searching for cationic extended materials with a capacity for anion exchange resulted in a unique thorium molybdate chloride (TMC) with the formula of [Th(MoO4 )(H2 O)4 Cl]Cl·H2 O. The structure of TMC is composed of zigzagging cationic layers [Th(MoO4 )(H2 O)4 Cl]+ with Cl- as interlamellar charge-balancing anions. Instead of performing ion exchange, alkali thorium fluorides were formed after soaking TMC in AF (A = Na, K, and Cs) solutions. The mechanism of AF immobilization is elucidated by the combination of SEM-EDS, PXRD, FTIR, and EXAFS spectroscopy...
June 18, 2018: Inorganic Chemistry
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