17-12-2025
جامعة الملك عبدالعزيز
KING ABDULAZIZ UNIVERSITY
Faculty of Environmental Sciences
Document Details
Document Type
:
Article In Journal
Document Title
:
Iron Chelation by Polyamidoamine Dendrimers: A Second-Order Kinetic Model for Metal-Amine Complexation
إزالة الحديد باستخدام مركب اميدو أمين المتعدد: نموذج الدرجة الثانية الحركية لعملية التفاعل بين المعدن والأمين
Document Language
:
English
Abstract
:
This study presents a kineticmodel of the chelation of iron ions by generation 4 hydroxyl-terminated polyamidoamine (PAMAM) with ethylenediamine core (G4-OH). The coordination processes of iron ions from ferric chloride, FeCl3, and ferrous bromide, FeBr2, to G4-OH dendrimers were analyzed using ultravioletvisible (UVvis) spectroscopy, proton nuclear magnetic resonance (1H NMR) spectroscopy, and liquid chromatographymass spectrometry (LCMS). In the visible region, a charge-transfer was observed when the dendrimer was added to a ferric chloride solution. This phenomenon is a ligand-to-metal charge-transfer (LMCT) between the free electron group of the dendrimer’s internal amines and the dehalogenated iron ion that takes 2 h to complete at room temperature. Analysis of potential rate laws and diffusion effects led to a second-order kinetic model for this reaction. By measuring the rate coefficients as a function of temperature (2237 C), an apparent activation energy of 41.5 kJ/mol was obtained using the Arrhenius method. The results of this study will fuel research of PAMAM dendrimers for environmental, pharmaceutical, and materials applications.
ISSN
:
1520-6106
Journal Name
:
The Journal of Physical Chemistry B
Volume
:
2
Issue Number
:
115
Publishing Year
:
1432 AH
2011 AD
Article Type
:
Article
Added Date
:
Monday, February 13, 2012
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
محمد حسن رمضان
Ramadan, Mohamed Hassan
Researcher
Doctorate
mhmram@hotmail.com
Files
File Name
Type
Description
32281.pdf
pdf
Back To Researches Page