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Register a new userStudy of the equilibriums phases in the binary system for Sodium molybdate and lead molybdate (Na2MoO4– pbMoO4)
دراسة توازنات الأطوار في الجملة الثنائية لموليبدات الصوديوم و موليبدات الرصاص Na2MoO4 - pbMoO4
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Tishreen University ورقة بحثية
Publication date
2017
fields
Chemistry
and research's language is
العربية
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تشكل جملة موليبدات الرصاص و الصوديوم واحدة من أكثر المركبات الكيميائية الواعدة نظراً لخواصها المختلفة عند استخدامها في العديد من التطبيقات التكنولوجية المتعددة, مثل تحضير الخزفيات و المواد المقاومة للانصهار و استخدامها في تطبيقات الطاقة الشمسية. يهدف هذا البحث إلى دراسة توازنات الأطوار في الجملة الثنائية لموليبدات الصوديوم مع موليبدات الرصاص، استخدم لذلك تقنية حيود الأشعة السينية و تقنية التحليل الحراري التفاضلي لدراسة بعضاً من خواصها الفيزيائية . من نواتج هذه الدراسة الحصول على محلول صلب المتشكل على أساس موليبدات الرصاص حيث تنحل موليبدات الصوديوم في موليبدات الرصاص حتى النسبة المئوية المولية 40% .
Lead and sodium molybdates form one of the most promising chemical compounds because of their various and important properties when used in many different technological applications such ceramic preparation, melting resistance materials and used in solar energy applications. This research aims to study the equilibriums phases in the binary system of sodium molybdate with lead molybdate. We used there for tow techniques :The technique of X-ray diffraction, and technique of differential thermal analysis to study some physical properties. The result of this research was the obtaining of a solid solution based on a lead molybdates, where the sodium molybdate is dissolved in the lead molybdateup to 40 % molar percentage.
References used
JOHN, B. WACHTMAN, Jr. Ceramic Innovationsin the 20th century, TheAmerican Ceramic Society, 1999
MORTIMER, C. E. Chemistry: A Conceptual Approa. 3rd ed,D. Van Nostrad Company, New York,1975
BRADSHAW,R.W. ;TYNER,C.E. Chemical and Engineering Factors AffectingSolar Central Receiver Applications of Ternary Molten Salts. AIChE Summer National Meeting, Denver, CO,Reprint 90b, August 1988
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In this research study Toisat phase in bilateral Wholesale (NaVO3-CaMoO4) in vitro
(in the laboratories of the Faculty of Science), where is the concept of phase transitions, the
basis for many of the natural sciences chemistry , physics and biolog
y, which is the
premise of science engineering, mechanical and electrical such as engineering and
materials engineering. Transitions are considered the metaphase common in nature, it has
benefited rights in the development and improvement of old materials, which was able to
elaborate the phase transitions unfamiliar (Fluid high, conductivity high, glass metals) and
in which they can solve many of the technical problems that were facing the technology,
and this is still the door open as long as the will to improve life on the basis of scientific
progress exist.
??When examining any material changes within the stages, studying the so-called
scheme of balance or eccentric scheme, since the material balance energy Minimal when
changing variables Altermdinamekih. Practically impossible to reach a state of
equilibrium, lies the importance of research to obtain crystalline compounds in the binary
strings of dead sodium vanadate with calcium molybdate what these salts from the
properties of the quality in the areas of technology, so it was important to study the
possibility of obtaining new phases at different Molar ratios and fee balances schemes her
eccentric. Especially since the salts derived for the study have different crystalline
structures and can therefore predict that the outputs of the study will be important and
good.
This study shows form the core of a solution on the basis of calcium molybdate
where dissolved sodium molybdateMataffanadat in calcium up to 40% of sodium
Mataffanadat.
The importance of diagram system MnO2─NaVO3 is in obtaining a crystal phase
(chemical compounds or solid solutions). Acknowledging the fact that these compounds
have grade properties in the field of technology, it was important to study the possibi
lity of
obtaining new phases with different mole ratios, and to draw phase diagram for it,
especially the used compounds in this study have different crystal structures.
The samples were made beginning from powders of reagent grade MnO2 and NaVO3 of
5gr for each of them at following percentage mole ratios of MnO2: (10, 20, 25, 30, 33.33,
50, 66.66, 70, 71, 75, 80, 90). The mixing and grinding process was made for these
samples. Then, it made pills ellipsoidal using manually hydraulic press, and it burned into
oven at different degrees. The study was made using powder X─Rays diffraction PXRD
and different thermal analysis TG─ DTA. The results are compared with X─rays
spectrums of grade compounds and parameters of it. Then, the formation phase changes
degrees were determined. New compound was formed at ratio (MnO2)10(NaVO3)90
mole%, and crystal solid solution was formed to ratio (MnO2)25(NaVO3)75 mole%. As well
solid solution (amorphous+ new compound) was formed until mole ratio
(MnO2)75(NaVO3)25 mole%, and amorphous solid solution was formed beginning mole
ratio (MnO2)80(NaVO3)20 mole%, then the phase diagram for the studied system was
drawing.
The glassy carbon electrode has been used as working electrode,
to study the electrochemical behavior of Se(IV), by using anodic
stripping voltammetric method (ASV) in acidic media HCl. We
found that The reason for the absence of analytical signal
s
expressed on flow any electrodic process due to reduction
mechanism of Se(IV) on glassy carbon electrode from Se4+to Se2-
and formation H2Se.
Carried out a laboratory experiment in order kinetics study of adsorption
of cadmium and lead in the soil, using soil columns experiment, with the
use of concentration 26.25 mg / l for cadmium, and 27.81 mg / l for lead,
and two degrees of pH 5.5, 0.7, with the use of five parameters.
Studied the distribution coefficient of elemental copper and lead contaminants in the aqueous phase using a Bi-phase system: solid phase (the sands of Palmyra) and liquid phase (water containing the former two elements), where they were sampling sand
samples from different regions in Palmyra to investigate for possible use as an adsorbent for elemental copper the lead from contaminated water, and after adjustment for certain transactions from time mixing phases, granular size, concentration of hydrogen ions, the concentration of the contaminated ingredient, the concentration of rival element (calcium) in addition to the ratio v / m in order to get the best rate for removal of these elements. The removal rate of copper componentamounted to 99.9% using four sites samples of sand a Palmyra, (al qareaten - the third leg to pump crude oil T3 - Alhl field - the valley between Mount aldahek and Sokhna) For lead removal ratio stood at 76.35% for the qareaten and 87.75% of the station the third to pump crude oil and 95 0.0% of the field Alhl and 96.25% of the valley between Mount aldahek and Sukhna. The application of the conditions that we have obtained in the laboratory to industrial water samples from the water income for the unity of treatment in Banias refinery and Water Company Drinaj of the Syrian Company for Oil Transport and the ratio of the removal of lead in the four samples ranging from ( 97.79 - 100)% for water Banias Refinery Company ranged between (83.89 - 88.08)% for water Syrian Company for Oil Transport, while the percentage of removal of the copper in the four samples ranging from (96.52 - 99.37)% for water Banias refinery Company and ranged ratio remove copper from the Syrian Company for Oil Transport water between (82.66 - 96.28)% in four samples.
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