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Register a new userKinetics and Mechanism for the UV-Visible Photolysis Ferrioxalate Complexes in the Absence and Presence of Oxygen, in Aqueous Solutions.
حركية و آلية التحلل الضوئي لمعقدات أوكزالات الحديد الثلاثي في المحاليل المائية, بغياب الأكسجين و بوجوده
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حسن سلمان جريكوس( باحث )
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تضمن هذا العمل دراسة حركية و آلية التحلل الضوئي لمعقدات أوكزالات الحديد الثلاثي تحت تأثير الضوء فوق البنفسجي \ المرئي في الوسط المائي, بغياب الأكسجين الجزيئي و بوجوده.
In this work, the UV-Visible photolysis aqueous ferrioxalate complexes has been studied kinetically and mechanistically, in the absence and presence of molecular oxygen.
References used
FAUST, B.C., and HOIGNÉ, J., Photolysis of Fe(III)-hydroxy Complexes as Sources of OH Radicals in Clouds, Fog and Rain, Atmos. Environ. 24 A, 1990, 79-89
FINLAYSON-PITTS, B. J., and PITTS, J. N., Atmospheric Chemistry: Fundamental and Experimental Techniques , 1st ed.; John Wiley & Sons: New York, 1986, 1098
YUEGANG, Z., and HOLGNE, J., Formation of Hydrogen Peroxide and of Oxalic Acid in Atmospheric Water by Photolysis of Iron (III)- Oxalato Complexes, Environ. Sci. Techno., Vol. 26, 1992, 1014- 1022
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تناول البحث الحالي دراسة تفاعل الإرجاع الفوتوكيميائي للكروم السداسيّ المستحثّ بوساطة معقّدات مانديلات الحديد الثلاثيّ في المحاليل المائيّة. و تمّ إجراء تجارب مقارنة من أجل تحديد الشروط المثلى لتفاعل الإرجاع الضوئي للكروم السداسيّ في الجملة:؛ حيث دُرس
ت تأثيرات كلّ من: - الوسط و التراكيز الابتدائيّة للمكوّنات المختلفة؛ الحديد الثلاثيّ و حمض المانديليك و الكروم السداسيّ، على فعالية إرجاع الكروم السداسيّ.
أظهرت النتائج التجريبيّة أنّه يمكن لمعقّد مانديلات الحديد الفعّال ضوئياً إرجاع الكروم السداسيّ باستخدام الضوء فوق البنفسجي/ المرئي ، و أنّ قيمة المُثلى للإرجاع الفوتوكيميائي للكروم السداسيّ بوساطة هذا المعقّد تبلغ نحو .
و تبيّن أنّ فعالية الإرجاع الضوئي للكروم السداسيّ تزداد بازدياد التراكيز الابتدائيّة لكلّ من الحديد الثلاثيّ و حمض المانديليك، و لكنّها تتناقص كلّما ازدادت التراكيز الابتدائيّة للكروم السداسيّ.
و قد تمّ اقتراح آليّة محتملة لتفاعل الإرجاع الضوئي للكروم السداسيّ بوساطة معقد مانديلات الحديد الفعّال ضوئياً في المحلول المائي.
The spectral characteristics of the iron(III) lactate complexes were examined by the spectrophotometric methode, and the absorbance of these complexes has been studied at diferente wavelengthes .
The stoichiometry of the photoreactive complex formed
in the iron(III)-lactate system has been investigated in aqeuous solution under determinative experimental conditions. Initial concentrations whether of Iron(III) or of lactic acid ranged from to , and -values were belonging to the range .
The results showed, that the ratio of iron(III) to lactate in the photoreactive complex is 1:2, i.e. its formula is .
This complex has a maximum absorption at 365 nm. Its molecular absorption coefficient is about ≈ and its dissociation constant is about .
The tentative mechanism for the photochemical decomposition of the complex has been suggested, in agreement with the reference studys . The suggested mechanism depends on the relationship between the absorbance and the photoreaction kinetics, and it is not based on the qualitative or quantitative analysis of reaction products.
The method of separation of acetone from its solutions by the ‘Salting out’
effect was studied.
This was interpreted by association of water molecules to the salt ions
formed so decreasing the number of free water molecules because of the
formati
on of a new liquid phase the solubility of organic compound in which is
less than in water.
Separation of acetone, can be explained qualitatively but not quantitatively.
Its mechanism and the molecular and ionic constructions can not be fully
understood by salting out alone.
In order to achieve better explanation, the thermal and concentrations
conditions of acetone separation were determined.
Results have shown that separation takes place, when a second turbid
pronounce phase was taken place by heating the mixture to a certain
temperature. A complete separation occurs when reaching some higher
temperatures.
The state of the hydrolysed molecules of both salt and acetone was shown
quantitatively.
The possibility of using tuff and modified Jordanian naturalzeolite to remove the iron
ions, a model component of heavy metals in underground water, off aqueous solution were
studied. Bench-scale process was used to remove the iron ions off standar
d solutions and
real under ground water. Different parameters affected the ion exchange have been
investigated, such as concentration, modifier type and PH. Zeolite characterizations
weredetermined as XRD, XRF, BET, TGA, andFTIRmethods.We found that the modified
zeolite with sodium chloride had more effect than other salts and the iron ions exchange
efficiency depends on concentration.Zeolite efficiency was affected by PH value. Time of
sorption equilibrium achieved within 250 min. The results agree with Langmuir model.
Syrian natural zeolit was used to study the adsorption of phenol from aqueous
solutions. Batch method was used to study the adsorption process.
The results showed that the adsorption process accurs rabidly at the first time and the
equilibrium ach
ieved after 120min .
The adsorption process performed in the rang of PH (3-10). The adsorption of phenol
increased by increasing of PH value up to(6-7) and then decreased.
The temperature affect the adsorption process and the results showed that the
increasing of the temperature leads to decreasing of the adsorption of phenol.The
maximum adsorption amount of phenol was 8 mg/g at 25C0 when the initial concentration
of phenol was 60mg/l.
Adsorption amount of phenol increased when the adsorbent dosage increased up to
0.3g of zeolite.
The resulted data of the adsorption isotherm were fitted with Langmuire model and
the monomolecular layer adsorption formed on the surdace of the adsorbent.
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