Kinetics and mechanism of the reduction of colloidal MnO2 by glycyl-leucine in the absence and presence of surfactants
المؤلفون المشاركون
Ikram, Muhammad Arshad
Altaf, Muhammad
Kabir al-Din
al-Thabaiti, Shail Ahmad
المصدر
Journal of Saudi Chemical Society
العدد
المجلد 16، العدد 3 (31 يوليو/تموز 2012)، ص ص. 217-225، 9ص.
الناشر
تاريخ النشر
2012-07-31
دولة النشر
السعودية
عدد الصفحات
9
التخصصات الرئيسية
الموضوعات
الملخص EN
The kinetics of the reduction of water-soluble colloidal manganese dioxide by glycylleucine (Gly-Leu) has been investigated in the presence of perchloric acid both in aqueous as well as micellar media at 3-C.
The study was carried out as functions of [MnO2], [Gly-Leu] and [HClO4].
The first-order-rate is observed with respect to [MnO2], whereas fractional-order-rates are determined in both [Gly-Leu] and [HClO4].
Addition of sodium pyrophosphate and sodium fluoride enhanced the rate of the reaction.
Further, the use of surfactant micelles is highlighted as, in favourable cases, the micelles help the redox reactions by bringing the reactants into a close proximity due to hydrogen bonding.
While the ionic surfactants SDS and CTAB have not shown any effect on the reaction rate, the nonionic surfactant TX-100 has catalytic effect which is explained in terms of the mathematical model proposed by Tuncay et al.
(1999).
The Arrhenius and Eyring equations are valid for the reaction over the range of temperatures used and different activation parameters (Ea, DH#, DS# and DG#) have been evaluated.
Kinetic studies show that the redox reaction between MnO2 and Gly-Leu proceeds through a mechanism combining one-and two-electron pathways: Mn (IV) fi Mn (III) fi Mn (II) and Mn (IV) fi Mn (II).
On the basis of the observed results, a possible mechanism has been proposed and discussed.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Ikram, Muhammad Arshad& Altaf, Muhammad& Kabir al-Din& al-Thabaiti, Shail Ahmad. 2012. Kinetics and mechanism of the reduction of colloidal MnO2 by glycyl-leucine in the absence and presence of surfactants. Journal of Saudi Chemical Society،Vol. 16, no. 3, pp.217-225.
https://search.emarefa.net/detail/BIM-351826
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Ikram, Muhammad Arshad…[et al.]. Kinetics and mechanism of the reduction of colloidal MnO2 by glycyl-leucine in the absence and presence of surfactants. Journal of Saudi Chemical Society Vol. 16, no. 3 (Jul. 2012), pp.217-225.
https://search.emarefa.net/detail/BIM-351826
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Ikram, Muhammad Arshad& Altaf, Muhammad& Kabir al-Din& al-Thabaiti, Shail Ahmad. Kinetics and mechanism of the reduction of colloidal MnO2 by glycyl-leucine in the absence and presence of surfactants. Journal of Saudi Chemical Society. 2012. Vol. 16, no. 3, pp.217-225.
https://search.emarefa.net/detail/BIM-351826
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references : p. 216-217
رقم السجل
BIM-351826
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
تقوم هذه الخدمة بالتحقق من التشابه أو الانتحال في الأبحاث والمقالات العلمية والأطروحات الجامعية والكتب والأبحاث باللغة العربية، وتحديد درجة التشابه أو أصالة الأعمال البحثية وحماية ملكيتها الفكرية. تعرف اكثر