Document Details

Document Type : Article In Journal 
Document Title :
Formation, characterization and stabilization of water-soluble colloidal MnO2 in the oxidation of methionine, thiourea and thioacetamide by permanganate
Formation, characterization and stabilization of water-soluble colloidal MnO2 in the oxidation of methionine, thiourea and thioacetamide by permanganate
 
Document Language : Arabic 
Abstract : Stabilization and characterization of water soluble colloidal MnO2 during the oxidation of sulfur-containing organic reductants "thiourea, thioactamide and methionine" by permanganate in aqueous neutral media are reported for the first time. Upon addition of permanganate to a solution of methionine, a transient species appears within the time of mixing which is stable for several weeks. On the other hand, the transient species is unstable in the presence of thiourea and thioacetamide, respectively. The nature of manganese (IV) species present in solution was characterized by spectrophotometric and coagulation measurements. On addition of HClO4, there is a decrease in the absorbance of the reaction mixture. Under pseudo – first – order conditions ([reductants] > [MnO4-]), the reduction rate was very fast up to the formation of water soluble colloidal MnO2. The effect of various parameters, such as hydrogen ion concentration, amount of MnO4-, concentration of reductants was investigated. Mechanisms consistent with the observed results have been proposed and discussed. 
Journal Name : Colloid and Polymer Science 
Volume : 285 
Issue Number : 13 
Publishing Year : 2007 AH  
Added Date : Tuesday, June 3, 2008 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
أ.د. شعيل بن أحمد الثبيتيDr. Shaeel Ahmed AL-ThabaitiResearcher sthabiti@hotmail.com
د. فوزية محمد النويصر F.M. Al-NowaiserResearcher falnowaiser@kau.edu.sa
أ.د. عبد الرحمن بن عبيد اليوبيA.O. Al-Youbi Researcher aalyoubi@kau.edu.sa
أ.د.عبد الله بن يوسف عبـد الله عبيــــدA.Y. ObaidResearcher aobaid@kau.edu.sa
د. ظهيــر نصـــر الدين خـــان Zaheer KhanResearcher drkhanchem@yahoo.com

Download This Page

Back To Researches Page