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Journal articles on the topic 'Synthesis of metal phosphates'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Szirtes, László, László Riess, János Megyeri, and Ernõ Kuzmann. "Comparative study of layered tetravalent metal phosphates containing various first-row divalent metals. Synthesis, crystalline structure." Open Chemistry 5, no. 2 (June 1, 2007): 516–35. http://dx.doi.org/10.2478/s11532-007-0003-2.

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AbstractThe transition metal forms of α-zirconium-. titanium-, and hafnium phosphates were prepared by ion exchange method. Their structure was investigated by X-ray powder diffraction (XRPD) method. It was found that the transition metal containing phosphates have the same layered structure as the pristine tetravalent metal phosphates, except for the increase of interlayer distance from 7.6 Å to ∼9.5 Å. As a result of the incorporation of transition metals in the layers, the c-axis is increased from ∼15 Å to ∼20 Å (in the case of titanium phosphate to ∼25 Å). All other parameters (a, b and β °) are practically unchanged.

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2

Qrareya, Hisham, Lorenzo Meazza, Stefano Protti, and Maurizio Fagnoni. "Metal-free synthesis of biarenes via photoextrusion in di(tri)aryl phosphates." Beilstein Journal of Organic Chemistry 16 (December 8, 2020): 3008–14. http://dx.doi.org/10.3762/bjoc.16.250.

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A metal-free route for the synthesis of biarenes has been developed. The approach is based on the photoextrusion of a phosphate moiety occurring upon irradiation of biaryl- and triaryl phosphates. The reaction involves an exciplex as the intermediate and it is especially suitable for the preparation of electron-rich biarenes.

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3

Dinamani, M., and P. Vishnu Kamath. "Electrochemical synthesis of metal phosphates by cathodic reduction." Materials Research Bulletin 36, no. 11 (September 2001): 2043–50. http://dx.doi.org/10.1016/s0025-5408(01)00682-1.

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4

Yakubovich, Olga, Nellie Khasanova, and Evgeny Antipov. "Mineral-Inspired Materials: Synthetic Phosphate Analogues for Battery Applications." Minerals 10, no. 6 (June 7, 2020): 524. http://dx.doi.org/10.3390/min10060524.

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For successful development of novel rechargeable batteries, considerable efforts should be devoted to identifying suitable cathode materials that will ensure a proper level of energy output, structural stability, and affordable cost. Among various compounds explored as electrode materials, structural analogues of minerals–natural stable inorganic solids–occupy a prominent place. The largest number of varieties of phosphate minerals occurs in rare metal granite pegmatites, and many of which contain transition metals as essential components. Transition metal phosphates are promising candidates for exploration as cathode materials due to a perfect combination of easily scalable synthesis, moderate-to-high voltage operation, thermal/chemical stability, and environmental safety. However, impurities usually presented in natural objects, and often inappropriate sample morphologies, do not permit the use of minerals as battery electrode materials. Nevertheless, the minerals of different classes, especially phosphates, are considered as prototypes for developing novel materials for battery applications. The crystal chemical peculiarities of the phosphate representatives that are most relevant in this aspect and the electrochemical characteristics of their synthetic analogues are discussed here.

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5

Lanfranco, A. M., P. F. Schofield, P. J. Murphy, M. E. Hodson, J. F. W. Mosselmans, and E. Valsami-Jones. "Characterization and identification of mixed-metal phosphates in soils: the application of Raman spectroscopy." Mineralogical Magazine 67, no. 6 (December 2003): 1299–316. http://dx.doi.org/10.1180/0026461036760166.

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AbstractThe development of protocols for the identification of metal phosphates in phosphate-treated, metalcontaminated soils is a necessary yet problematical step in the validation of remediation schemes involving immobilization of metals as phosphate phases. The potential for Raman spectroscopy to be applied to the identification of these phosphates in soils has yet to be fully explored. With this in mind, a range of synthetic mixed-metal hydroxylapatites has been characterized and added to soils at known concentrations for analysis using both bulk X-ray powder diffraction (XRD) and Raman spectroscopy.Mixed-metal hydroxylapatites in the binary series Ca –Cd, Ca –Pb, Ca –Sr and Cd –Pb synthesized in the presence of acetate and carbonate ions, were characterized using a range of analytical techniques including XRD, analytical scanning electron microscopy (SEM), infrared spectroscopy (IR), inductively coupled plasma-atomic emission spectrometry (ICP-AES) and Raman spectroscopy. Only the Ca –Cd series displays complete solid solution, although under the synthesis conditions of this study the Cd5(PO4)3OH end member could not be synthesized as a pure phase. Within the Ca –Cd series the cell parameters, IR active modes and Raman active bands vary linearly as a function of Cd content. X-ray diffraction and extended X-ray absorption fine structure spectroscopy (EXAFS) suggest that the Cd is distributed across both the Ca(1) and Ca(2) sites, even at low Cd concentrations.In order to explore the likely detection limits for mixed-metal phosphates in soils for XRD and Raman spectroscopy, soils doped with mixed-metal hydroxylapatites at concentrations of 5, 1 and 0.5 wt.% were then studied. X-ray diffraction could not confirm unambiguously the presence or identity of mixed-metal phosphates in soils at concentrations below 5 wt.%. Raman spectroscopy proved a far more sensitive method for the identification of mixed-metal hydroxylapatites in soils, which could positively identify the presence of such phases in soils at all the dopant concentrations used in this study. Moreover, Raman spectroscopy could also provide an accurate assessment of the degree of chemical substitution in the hydroxylapatites even when present in soils at concentrations as low as 0.1%.

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6

Pet’kov, V. I., M. V. Sukhanov, A. S. Shipilov, V. S. Kurazhkovskaya, E. Yu Borovikova, N. V. Sakharov, M. M. Ermilova, and N. V. Orekhova. "Synthesis and structure of alkali metal zirconium vanadate phosphates." Russian Journal of Inorganic Chemistry 58, no. 9 (September 2013): 1015–21. http://dx.doi.org/10.1134/s0036023613090167.

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7

Haushalter, R. "Synthesis and structure of new alkali metal molybdenum phosphates." Solid State Ionics 26, no. 2 (March 1988): 158. http://dx.doi.org/10.1016/0167-2738(88)90102-6.

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8

Zatovsky, Igor V., Nikolay S. Slobodyanik, Denis A. Stratiychuk, Konstantin V. Domasevitch, Joachim Sieler, and Eduard B. Rusanov. "A Novel Convenient Synthesis of Mixed-Valence TiIII/TiIV Double Phosphates Starting with Titanium Nitride TiN." Zeitschrift für Naturforschung B 55, no. 3-4 (April 1, 2000): 291–98. http://dx.doi.org/10.1515/znb-2000-3-411.

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Abstract A new synthetic approach for the low- and mixed-valence double titanium phosphates starting with titanium nitride, TiN, and based on the controlled oxidation of a low-valent metal in the phosphate melt is presented. The reaction of the system MI2O - P2O5 - TiN (MI = Na, K) in air (800-1050 °C) leads to loss of nitrogen, N2, and results in the formation of a number of double phosphates: KTiP2O7, K2TiniTiIV(PO4)3, KTiOPO4, NaTiP2O7, NaTi2(PO4)3 and a new mixed-valent diphosphate, NaTiIIITiIV(P2O7)2. The mixed-valent species K2TiIIITiIV(PO4)3 and NaTiIIITiIV(P2O7)2 were characterized by single crystal X-ray diffraction. The described synthetic procedure is proposed as a simple and convenient method for the preparation of lowand mixed-valent phosphate materials

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9

Rao, C. N. R., Srinivasan Natarajan, Amitava Choudhury, S. Neeraj, and R. Vaidhyanathan. "Synthons and design in metal phosphates and oxalates with open architectures." Acta Crystallographica Section B Structural Science 57, no. 1 (February 1, 2001): 1–12. http://dx.doi.org/10.1107/s0108768100017638.

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We briefly describe the structures of open-framework metal phosphates with different dimensionalities, such as the one-dimensional linear-chain and ladder structures, two-dimensional layer structures and three-dimensional structures with channels. We demonstrate the role of the zero-dimensional four-membered ring monomer and of the one-dimensional ladder structure as the starting building units or synthons involved in the formation of the complex architectures. Thus, we show how the one-dimensional ladder structure transforms to two- and three-dimensional structures under mild conditions. The two-dimensional layer structures also transform to three-dimensional structures, while the zero-dimensional monomer transforms to layered and three-dimensional structures under ordinary reaction conditions. These transformations provide an insight into the possible pathways involved in the building up of the complex structures of metal phosphates. The isolation of amine phosphates during the hydrothermal synthesis of metal phosphates and also the facile reactions between amine phosphates and metal ions to yield a variety of open-framework materials have thrown light on the mechanism of formation and design of these structures. The existence of a hierarchy of open-framework metal oxalates and their ready formation by employing amine oxalates as intermediates provides additional support to the observations made earlier with regard to the phosphates.

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10

Dong, Angang, Nan Ren, Yi Tang, Yajun Wang, Yahong Zhang, Weiming Hua, and Zi Gao. "General Synthesis of Mesoporous Spheres of Metal Oxides and Phosphates." Journal of the American Chemical Society 125, no. 17 (April 2003): 4976–77. http://dx.doi.org/10.1021/ja029964b.

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11

Cheng, Soofin, Jee-Ten Wang, and Chun-Liang Lin. "Layered Group(IV) Metal Phosphates as Catalysts for MTBE Synthesis." Journal of the Chinese Chemical Society 38, no. 6 (December 1991): 529–34. http://dx.doi.org/10.1002/jccs.199100088.

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12

Bastakoti, Bishnu Prasad, Yunqi Li, Sudhina Guragain, Malay Pramanik, Saad M. Alshehri, Tansir Ahamad, Zongwen Liu, and Yusuke Yamauchi. "Synthesis of Mesoporous Transition-Metal Phosphates by Polymeric Micelle Assembly." Chemistry - A European Journal 22, no. 22 (April 18, 2016): 7463–67. http://dx.doi.org/10.1002/chem.201600435.

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13

Kim, Inho, Soo-Hong Lee, Byungkwon Lim, Bum Jun Park, Suk Ho Bhang, and Taekyung Yu. "Aqueous-phase synthesis of metal nanoparticles using phosphates as stabilizers." Korean Journal of Chemical Engineering 34, no. 1 (November 9, 2016): 231–33. http://dx.doi.org/10.1007/s11814-016-0263-7.

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14

Li, Ying, Han-Ying Li, Kai-Chi Chang, Hsiu-Mei Lin, and Chih-Min Wang. "Recent developments in organic–inorganic hybrid metal phosphates and phosphites." Dalton Transactions 50, no. 29 (2021): 10014–19. http://dx.doi.org/10.1039/d1dt01016f.

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This frontier article highlights recent advances in synthesis and characterization of organic–inorganic hybrid metal phosphates and phosphites. The synthetic strategies and structural stabilities of hybrid composites blended with stable crystalline compounds are presented.

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15

Senthilkumar, Baskar, Kalimuthu Vijaya Sankar, Leonid Vasylechko, Yun-Sung Lee, and Ramakrishnan Kalai Selvan. "Synthesis and electrochemical performances of maricite-NaMPO4 (M = Ni, Co, Mn) electrodes for hybrid supercapacitors." RSC Adv. 4, no. 95 (2014): 53192–200. http://dx.doi.org/10.1039/c4ra06050d.

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16

Stegmann, Niklas, Hilke Petersen, Claudia Weidenthaler, and Wolfgang Schmidt. "Facile synthesis of novel, known, and low-valent transition metal phosphates via reductive phosphatization." Journal of Materials Chemistry A 9, no. 34 (2021): 18247–50. http://dx.doi.org/10.1039/d1ta03782j.

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Novel and known low valent transition metal phosphates (TMPs) are accessible via a novel and facile pathway denoted as reductive phosphatization. The method allows syntheses of TMPs especially with reduced oxidation states.

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17

Benhsina, Elhassan, Abderrazzak Assani, Mohamed Saadi, and Lahcen El Ammari. "Synthesis and structure study of new manganese and indium based phosphate: (Ca,Ba)1.222Mn0.923In1.570(PO4)3." MATEC Web of Conferences 149 (2018): 01085. http://dx.doi.org/10.1051/matecconf/201814901085.

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Phosphates are an important class of materials which are well-known due to their structural diversity and their important potential application in many fields of sciences. A member of this family, represented by transition metal phosphates, is in the forefront of important researchers. A new manganese and indium based phosphate is successfully isolated by means of solid state reaction. Its corresponding crystal structure is isotypic to the alluaudite and crystallizes in the monoclinic system with the space group C2/c and cell parameters a=12.4697(5)Å ; b=12.9365(5)Å ; c=6.5625(3)Å and β=115.603(1)°. The framework of this phosphate is built up on the basis of MnO6, InO6 and PO4 polyhedra. The InO6 octahedra are linked together via common edge, leading to the formation of In2O10 dimers. The In2O10 dimers share edge with MnO6 octahedra, generating chains along the [101] direction. The PO4 tetrahedra connect two chains giving arise to a three-dimensional framework with hexagonal tunnels where the barium and calcium are located.

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18

Mao, Yumei, Ying Zhang, Lei Li, Jing Li, Hongmei Zeng, Guohong Zou, and Zhien Lin. "Crystalline metal phosphates with layered structures: Synthesis, luminescence, and proton conduction." Journal of Solid State Chemistry 282 (February 2020): 121067. http://dx.doi.org/10.1016/j.jssc.2019.121067.

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19

Tang, X., and A. Lachgar. "The synthesis and crystal structures of alkaline earth metal indium phosphates." Acta Crystallographica Section A Foundations of Crystallography 52, a1 (August 8, 1996): C403. http://dx.doi.org/10.1107/s0108767396083390.

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20

Bogdanova, V. V., and O. I. Kobets. "Synthesis and physicochemical properties of Di- and trivalent metal-ammonium phosphates." Russian Journal of Applied Chemistry 87, no. 10 (October 2014): 1387–401. http://dx.doi.org/10.1134/s1070427214100012.

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21

Murugavel, R., Amitava Choudhury, M. G. Walawalkar, R. Pothiraja, and C. N. R. Rao. "Metal Complexes of Organophosphate Esters and Open-Framework Metal Phosphates: Synthesis, Structure, Transformations, and Applications." Chemical Reviews 108, no. 9 (September 10, 2008): 3549–655. http://dx.doi.org/10.1021/cr000119q.

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22

Cai, Xuan, Zhenxing Wang, Huanhuan Zhang, Yufei Li, Kaicha Chen, Hongli Zhao, and Minbo Lan. "Carbon-mediated synthesis of shape-controllable manganese phosphate as nanozymes for modulation of superoxide anions in HeLa cells." Journal of Materials Chemistry B 7, no. 3 (2019): 401–7. http://dx.doi.org/10.1039/c8tb02573h.

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23

Terebilenko, Katerina V., Nikolay S. Slobodyanik, Igor V. Zatovsky, and Vaycheslav N. Baumer. "Synthesis, Structure and Luminescence Properties of Rare-Earth Double Phosphates." Solid State Phenomena 200 (April 2013): 33–37. http://dx.doi.org/10.4028/www.scientific.net/ssp.200.33.

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The main crystallization trends of rare-earth complex oxides from alkaline phosphate-molybdate (tungstate) melts have been studied in a light of structure - luminescence properties relationships. The regions of formation MI3RE(PO4)2, REPO4 and MI2RE(PO4)(MVIO4) from self flux systems MI–P–RE–O (MI–alkaline metal; MVI–Mo, W) have been defined. The influence of MI/MVI ratio in the initial melt has been shown to play the key role in solid phase formation and structural peculiarities of REOx polyhedral condensation of compounds obtained.

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24

Lin, Ronghe, and Yunjie Ding. "A Review on the Synthesis and Applications of Mesostructured Transition Metal Phosphates." Materials 6, no. 1 (January 15, 2013): 217–43. http://dx.doi.org/10.3390/ma6010217.

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25

Parhi, Purnendu, Alok R. Ray, and Arunachalam Ramanan. "Metathetic Reaction in Reverse Micelles: Synthesis of Nanostructured Alkaline-Earth Metal Phosphates." Journal of the American Ceramic Society 90, no. 4 (April 2007): 1237–42. http://dx.doi.org/10.1111/j.1551-2916.2007.01508.x.

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26

Wang, Kangcai, Ting Li, Hongmei Zeng, Guohong Zou, Qinghua Zhang, and Zhien Lin. "Ionothermal Synthesis of Open-Framework Metal Phosphates Using a Multifunctional Ionic Liquid." Inorganic Chemistry 57, no. 15 (July 18, 2018): 8726–29. http://dx.doi.org/10.1021/acs.inorgchem.8b01509.

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27

Bhanja, Piyali, Yena Kim, Bappi Paul, Jianjian Lin, Saad M. Alshehri, Tansir Ahamad, Yusuf Valentino Kaneti, Asim Bhaumik, and Yusuke Yamauchi. "Facile Synthesis of Nanoporous Transition Metal‐Based Phosphates for Oxygen Evolution Reaction." ChemCatChem 12, no. 7 (April 6, 2020): 2091–96. http://dx.doi.org/10.1002/cctc.201901803.

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28

Jevtic, Sanja, Nevenka Rajic, and Venceslav Kaucic. "3-methylaminopropylamine as a templating agent in the synthesis of phosphate-based inorganic polymers." Journal of the Serbian Chemical Society 78, no. 12 (2013): 1893–909. http://dx.doi.org/10.2298/jsc131009113j.

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3-methylaminopropylamine (MPA) has been studied as a structure-directing agent (template) in the synthesis of open-framework phosphate-based materials. The influence of temperature, molar ratio of reactants, crystallization time and presence of fluoride ions on the crystallization of aluminophosphate, transition metal-substituted aluminophosphate [transition metal - Mn(II), Cr(III) and Co(II)] and zincophosphate has also been investigated. MPA exhibits the templating role and in all as-synthesized crystalline products and it is entrapped in an inorganic lattice interacting with the framework via hydrogen or/and electrostatic interactions. According to detailed thermal analysis the type of interactions seems to be crucial for thermal behaviour of MPA and also for the thermal stability of the organic-inorganic crystal system. Structural analysis suggested that the formed crystalline structures have no mutual structural analogy. This indicates that precise role of the organic (guest) component in nucleation process for the open-framework phosphates (host) is very complex as well as the nucleation process itself.

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29

Mao, Haifang, Xiaolei Li, Fen Xu, Zuobing Xiao, Wenxiang Zhang, and Tao Meng. "Vapour-Phase Selective O-Methylation of Catechol with Methanol over Metal Phosphate Catalysts." Catalysts 11, no. 5 (April 21, 2021): 531. http://dx.doi.org/10.3390/catal11050531.

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Guaiacol (2-methoxyphenol), an important fine chemical intermediate, is conventionally synthesized by liquid-phase processes with expensive, corrosive and toxic methylating agents such as dimethyl sulphate and dimethyl iodide. Recently, vapour-phase alkylation of catechol (1, 2-dihydroxybenzene) with methanol for the synthesis of guaiacol in the presence of heterogeneous catalysts has received more attention, as the route is economical and environmentally friendly. However, most of the investigated catalysts exhibited unsatisfactory catalytic performance for industrial applications. In this study, five metal phosphates M-P-O (M = La, Ce, Mg, Al, Zn) catalysts were synthesized and tested in the selective O-methylation of catechol with methanol. Among these catalysts, cerium phosphate (CP) showed the highest catalytic activity and guaiacol yield. Lanthanum phosphate (LP) was the second most active, which was still obviously better than magnesium phosphate (MP) and aluminium phosphate (ALP). Zinc phosphate (ZP) was not active in the reaction. Relevant samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), N2 adsorption-desorption, temperature programmed desorption of NH3 or CO2 (NH3-TPD, CO2-TPD). The suitable acid-base properties contribute to the superior catalytic performance of CP. Long-term stability and regeneration tests were also studied.

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30

Bond, Andrew D., Ann M. Chippindale, Andrew R. Cowley, Jennifer E. Readman, and Anthony V. Powell. "Synthesis and characterisation of transition-metal-substituted gallium phosphates with the laumontite structure." Zeolites 19, no. 5-6 (November 1997): 326–33. http://dx.doi.org/10.1016/s0144-2449(97)00099-7.

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31

GLAUM, ROBERT. "SYNTHESIS, CRYSTALLIZATION AND PURIFICATION OF ANHYDROUS TRANSITION METAL PHOSPHATES VIA THE GAS PHASE." Phosphorus Research Bulletin 10 (1999): 82–87. http://dx.doi.org/10.3363/prb1992.10.0_82.

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32

EGOR'KOVA, O. V., A. I. ORLOVA, and V. I. PET'KOV. "ChemInform Abstract: Synthesis, Structure, and Properties of Zirconium Trivalent Metal (Al, Fe) Phosphates." ChemInform 29, no. 26 (June 21, 2010): no. http://dx.doi.org/10.1002/chin.199826022.

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33

Garcia-Granda, S., C. Trobajo, A. Espina, S. A. Khainakov, and J. R. Garcia. "Hydrothermal synthesis and structural features of metal phosphates in the presence of amines." Acta Crystallographica Section A Foundations of Crystallography 64, a1 (August 23, 2008): C536. http://dx.doi.org/10.1107/s0108767308082780.

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34

Neeraj, S., P. M. Forster, C. N. R. Rao, and A. K. Cheetham. "A new route for the synthesis of open-framework metal phosphates using organophosphates." Chemical Communications, no. 24 (December 6, 2001): 2716–17. http://dx.doi.org/10.1039/b107898b.

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35

Sun, Zhen-Gang, Zhong-Min Liu, Lei Xu, Yue Yang, and Yan-Li He. "Hydrothermal synthesis and characterization of microporous crystals of trivalent metal-containing zirconium phosphates." Catalysis Today 93-95 (September 2004): 639–43. http://dx.doi.org/10.1016/j.cattod.2004.06.022.

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36

Guo, Xiaowen, Nan Li, Yan Cheng, Genlin Wang, Yongcai Zhang, and Huan Pang. "General synthesis of nitrogen-doped metal (M = Co2+, Mn2+, Ni2+, or Cu2+) phosphates." Chemical Engineering Journal 411 (May 2021): 128544. http://dx.doi.org/10.1016/j.cej.2021.128544.

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37

Bhat, Gulzar A., Alok Ch Kalita, and Ramaswamy Murugavel. "Intriguing structural chemistry of neutral and anionic layered monoalkylphosphates: single-source precursors for high-yield ceramic phosphates." CrystEngComm 19, no. 36 (2017): 5390–401. http://dx.doi.org/10.1039/c7ce01066d.

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A simple protocol for multi-gram synthesis of unstable and normally inaccessible phosphate monoesters ROPO₃H₂ is reported, apart from demonstration of their thermal instability and utility as starting materials for metal phosphate single source precursors.

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38

Dunne, Peter W., Alexis S. Munn, Chris L. Starkey, Tom A. Huddle, and Ed H. Lester. "Continuous-flow hydrothermal synthesis for the production of inorganic nanomaterials." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2057 (December 28, 2015): 20150015. http://dx.doi.org/10.1098/rsta.2015.0015.

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As nanotechnology becomes increasingly important and ubiquitous, new and scalable synthetic approaches are needed to meet the growing demand for industrially viable routes to nanomaterial production. Continuous-flow hydrothermal synthesis or supercritical water hydrothermal synthesis (scWHS) is emerging as a versatile solution to this problem. The process was initially developed to take advantage of the tunable chemical and physical properties of superheated water to produce metal oxide nanoparticles by rapid nucleation and precipitation. The development of new mixing regimes and reactor designs has been facilitated by the modelling of reactor systems. These new reactor designs further exploit the properties of supercritical water to promote faster and more uniform mixing of reagent streams. The synthetic approach has been expanded beyond the metal oxide systems for which it was conceived, and now encompasses metal sulfides, metal phosphates, metal nanoparticles and metal–organic frameworks. In many of these cases, some degree of size and shape control can be achieved through careful consideration of both chemistry and reactor design. This review briefly considers the development of scWHS reactor technology, before highlighting some of our recent work in expanding the scope of this synthetic method to include a wide range of materials.

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39

Huang, Lijuan, Lei Wang, Yan Zhao, Ling Huang, Jian Bi, Guohong Zou, Zhien Lin, and Daojiang Gao. "Two amino acid-templated metal phosphates: surfactant-thermal synthesis, water stability, and proton conduction." Dalton Transactions 49, no. 17 (2020): 5440–44. http://dx.doi.org/10.1039/d0dt00966k.

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An amino acid-templated gallium phosphate with a zeolitic topology has been prepared under surfactant-thermal conditions and it shows exceptional water stability and interesting proton-conducting properties.

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40

Axambayeva, Altynay Seitkhanovna, and Alexander Vyacheslavovich Shustov. "RECOMBINANT THERMOTOLERANT PHYTASE PRODUCED IN E.COLI." CBU International Conference Proceedings 3 (September 19, 2015): 412–18. http://dx.doi.org/10.12955/cbup.v3.631.

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Abstract: Phytic acid (myo-inositol hexakisphosphate) and its salts (phytates) are the major storage form of phosphorus in plants. Monogastric animals including hogs, poultry, and fish cannot utilize phytates as a source of phosphorus unless they are enzymatically destroyed with exogenous enzyme—phytase. Phytases are added to fodder in ever increasing dosage to improve utilization of plant-derived phosphorus because this reduces dependence of farms on inorganic fodder phosphates. Because of technological considerations, feed phytases have to withstand elevated temperatures (60-80°C), which are used during preparation of fodder. Enzymatic feed additives are becominutesg of high demand in Kazakhstan, and development of domestic technologies for production of agricultural enzymes is an ongoing challenge to the country’s biotechnology.Objectives: To develop a system for recombinant expression of industrially important thermotolerantphytase and confirm activity and thermal stability of the recombinantly expressed enzyme.Methods: De novo gene synthesis, expression of 6xHis-tagged protein in E.coli, immobilized metal affinity chouromatography, biochemical tests for activities of phosphatase and phytase.Results: Thermotolerantphytase was produced in E.coli using recombinant expression system. The obtained enzyme had phosphatise activity (hydrolyzed p-nitrophenyl phosphate) and phytase activity (hydrolyzed sodium phytate). The recombinant phytase tolerated increase of incubation temperature up to 70°C and demonstrated increase in activity towards phytate with increase in the reaction temperature in the range 30°C-70°C.Conclusion: Described gene and expression system have prospects of utilization in development of pilot industrial production of phytase in the country.

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41

Bakenov, Zhumabay, and Izumi Taniguchi. "LiMnPO4 Olivine as a Cathode for Lithium Batteries." Open Materials Science Journal 5, no. 1 (December 2, 2011): 222–27. http://dx.doi.org/10.2174/1874088x01105010222.

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The olivine structured mixed lithium-transition metal phosphates LiMPO4 (M = Fe, Mn, Co) have attracted tremendous attention of many research teams worldwide as a promising cathode materials for lithium batteries. Among them, lithium manganese phosphate LiMnPO4 is the most promising considering its high theoretical capacity and operating voltage, low cost and environmental safety. Various techniques were applied to prepare this perspective cathode for lithium batteries. The solution based synthetic routes such as spray pyrolysis, precipitation, sol-gel, hydrothermal and polyol synthesis allow preparing nanostructured powders of LiMnPO4 with enhanced electrochemical properties, which is mostly attributed to the higher chemical homogeneity and narrow particle size distribution of the material. Up-to-date, the LiMnPO4/C composites prepared by the spray pyrolysis route have the best electrochemical performance among the reported in the literature.

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Zhao, Yan, Hui-xuan Guo, Hong-guang Han, Jia-qi Zhang, and Xiao-min Hu. "Adsorptive Behavior of Prepared Metal-Organic Framework Composites on Phosphates in Aqueous Solutions." Adsorption Science & Technology 2021 (February 4, 2021): 1–10. http://dx.doi.org/10.1155/2021/6690361.

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As an efficient water treatment method for treating dilute solution systems, electrosorption is promising for the separation and recovery of organic compounds, wastewater treatment, and deep purification of water. Here, two types of UiO-66 samples were prepared using the solvothermal synthesis method, and the effects of different regulators on the microstructure of materials were compared using the various characterization methods. The electrochemical properties of the activated carbon and two types of materials were tested by cyclic voltammetry and AC impedance spectroscopy, and the desalination effect of the materials on phosphate was investigated. The UiO-66 material with uniform-size particles, smaller-size particles, and more surface adsorption sites exhibited better phosphate removal and adsorption capacity. It was found that the desalination process of the UiO-66 material is reversible, and the adsorbent material can be reused, which is advantageous for engineering applications.

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Song, Jun-Ling, Wen-Xiu Lu, Tian-Shuo Guo, and Yu-Hua Zhou. "Syntheses, crystal structures and optical properties of two one-dimensional germanophosphates: HRb3Ge2(HPO4)6 and CsGe(HPO4)2(OH)." Acta Crystallographica Section C Structural Chemistry 74, no. 10 (September 26, 2018): 1146–52. http://dx.doi.org/10.1107/s2053229618012792.

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Germanophosphates, as a young class of metal phosphates, have been less reported but might possess more diverse structural types and potential applications. Here, two one-dimensional (1D) alkali-metal germanophosphates (GePOs), namely, hydrogen hexakis(μ-hydrogen phosphato)digermaniumtrirubidium, HRb3Ge2(HPO4)6 (1), and caesium bis(μ-hydrogen phosphato)(μ-hydroxido)germanium, CsGe(HPO4)2(OH) (2), have been prepared by the solvothermal method. Compound 1 shows 1D [Ge(HPO4)6]∞ chains along the c axis formed by GeO6 octahedra and PO4 tetrahedra, with Rb+ cations dissociated between the chains. Compound 2 also exhibits 1D [Ge(HPO4)4(OH)2]∞ chains constructed from adjacent Ge(HPO4)4(OH)2 octahedra, with Cs+ cations dissociated between the chains. XRD, TGA, IR and UV–Vis–NIR absorption spectra are presented and discussed for both compounds.

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44

Neeraj, S., P. M. Forster, C. N. R. Rao, and A. K. Cheetham. "ChemInform Abstract: A New Route for the Synthesis of Open-Framework Metal Phosphates Using Organophosphates." ChemInform 33, no. 10 (May 22, 2010): no. http://dx.doi.org/10.1002/chin.200210017.

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HATZACK, Frank, Frank HÜBEL, Wei ZHANG, Poul E. HANSEN, and Søren K. RASMUSSEN. "Inositol phosphates from barley low-phytate grain mutants analysed by metal-dye detection HPLC and NMR." Biochemical Journal 354, no. 2 (February 22, 2001): 473–80. http://dx.doi.org/10.1042/bj3540473.

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Inositol phosphates from barley low-phytate grain mutants and their parent variety were analysed by metal-dye detection HPLC and NMR. Compound assignment was carried out by comparison of retention times using a chemical hydrolysate of phytate [Ins(1,2,3,4,5,6)P6] as a reference. Co-inciding retention times indicated the presence of phytate, D/L-Ins(1,2,3,4,5)P5, Ins(1,2,3,4,6)P5, D/L-(1,2,4,5,6)P5, D/L-(1,2,3,4)P4, D/L-Ins(1,2,5,6)P4 and D/L-Ins(1,4,5,6)P4 in PLP1B mutants as well as the parent variety. In grain extracts from mutant lines PLP1A, PLP2A and PLP3A unusual accumulations of D/L-Ins(1,3,4,5)P4 were observed whereas phytate and the above-mentioned inositol phosphates were present in relatively small amounts. Assignment of D/L-Ins(1,3,4,5)P4 was corroborated by precise co-chromatography with a commercial Ins(1,3,4,5)P4 standard and by NMR spectroscopy. Analysis of inositol phosphates during grain development revealed accumulation of phytate and D/L-Ins(1,3,4,5)P4, which suggested the tetrakisphosphate compound to be an intermediate of phytate synthesis. This assumption was strengthened further by phytate degradation assays showing that D/L-Ins(1,3,4,5)P4 did not belong to the spectrum of degradation products generated by endogenous phytase activity. Metabolic scenarios leading to accumulation of D/L-Ins(1,3,4,5)P4 in barley low-phytate mutants are discussed.

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Williams, D. J., J. S. Kruger, A. F. McLeroy, A. P. Wilkinson, and J. C. Hanson. "Iridium(III) Amine Complexes as High-Stability Structure-Directing Agents for the Synthesis of Metal Phosphates." Chemistry of Materials 11, no. 8 (August 1999): 2241–49. http://dx.doi.org/10.1021/cm9901921.

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47

Wang, Guangmei, Martin Valldor, Bert Mallick, and Anja-Verena Mudring. "Ionothermal synthesis of open-framework metal phosphates with a Kagomé lattice network exhibiting canted anti-ferromagnetism." Journal of Materials Chemistry C 2, no. 35 (June 9, 2014): 7417. http://dx.doi.org/10.1039/c4tc00290c.

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48

Usman, Ken Aldren S., Salvador C. Jr Buenviaje, Yasmin de Guzman Edañol, Marlon T. Conato, and Leon M. Payawan Jr. "Facile Fabrication of a Potential Slow-Release Fertilizer Based on Oxalate-Phosphate-Amine Metal-Organic Frameworks (OPA-MOFs)." Materials Science Forum 936 (October 2018): 14–19. http://dx.doi.org/10.4028/www.scientific.net/msf.936.14.

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This work demonstrates a simple, reproducible and scalable method of producing a potential slow-release fertilizer material. In this study, oxalate-phosphate-amine metal organic frameworks (OPA-MOFs) powder was synthesized from the hydrothermal treatment of ferric chloride (FeCl3•6H2O), orthophosphoric acid (H3PO4), oxalic acid dihydrate (H2C2O4•2H2O), and a common fertilizer, urea (CO(NH2)2). Being a structure directing agent (SDA)-type of MOF, the material is expected to slowly release urea via cation exchange, and eventually trigger the collapse of the framework, thus resulting to the subsequent release of the phosphates and iron-oxalate complexes. Elemental analysis revealed that the synthesized samples contains a promising amount of incorporated nitrogen and phosphorus. In this particular study, increasing in the amount of urea during the synthesis however revealed minimal change in the %N in the final product which tells us that maximum loading has already been achieved. P and N release experiments shall still be done bothinvitroand in actual soil samples to monitor the release delivery kinetics and efficiency of the OPA-MOFs for fertilizer release applications.

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Strutynska, Nataliia, Nikolai Slobodyanik, Anna Malyshenko, Igor Zatovsky, Igor Vorona, Yuriy Prylutskyy, Oleg Prymak, Nikolai Baran, Stanislav Ishchenko, and Valentyna Nosenko. "Synthesis, Characterization and EPR Investigation of γ-Induced Defects of Nanoparticles of (M^I, CO₃)-Containing Apatites (M^I – Na, K)." Solid State Phenomena 230 (June 2015): 133–39. http://dx.doi.org/10.4028/www.scientific.net/ssp.230.133.

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The nanoparticles of (Na, CO3)- and (K, CO3)-containing Calcium phosphates have been prepared by a wet precipitation method in aqueous media. The influence of nature of alkaline metal and of samples composition on particles size and peculiars of their thermal transformation have been studied using such physical-chemical methods as FTIR, XRD, SEM and TPM MS analysis. Chemical composition of powders have been determined by ICP analysis and the degree of substitution of Calcium atoms by alkaline metals depends on CO32-/PO43- molar ratio in initial solutions. The differences in the formation of γ-induced defects in (Na, CO3)- and (K, CO3)-containing apatites have been found using EPR spectroscopy.

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Onoda, Hiroaki. "Mechanochemical Effects on Syntheses of Some Rare Earth and Transition Metal Phosphates." Journal of the Society of Powder Technology, Japan 43, no. 5 (2006): 355–61. http://dx.doi.org/10.4164/sptj.43.355.

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