Hydrothermal synthesis and characterization of an akaganeite-type iron oxide octahedral molecular sieves (FeOx-OMS) by direct dissolution and transformation of layered precursor to 2x2 tunnel structure
Date of Publication
2001
Document Type
Master's Thesis
Degree Name
Master of Science in Chemistry
Subject Categories
Chemistry
College
College of Science
Department/Unit
Chemistry
Thesis Adviser
Elaine Tolentino
Defense Panel Chair
Jaime Raul O. Janairo
Defense Panel Member
Julita Robles
Christine Binag
Abstract/Summary
Iron oxide octahedral molecular sieve with 2x2 tunnel, designated as FeOx-OMS (2x2) was successfully synthesized through hydrothermal method. FeOx-OMS (2x2) has high degree of purity and higher thermal stability than those of previously reported akaganeite-type materials. The XRD pattern shows peaks that are characteristic of pure akaganeite-system. Based on its TGA (thermogravimetric analyses) profile, its thermal stability is reported at 255 degrees Centigrade and at 402 degrees Centigrade, a new phase is formed which is hematite-magnetite based on its XRD pattern. The SEM result shows a needle-like morphology that is a characteristic feature of a tunnel structure.Another successful route in producing akaganeite-type material is via transformation of a layered, lepidocrocite-type material precursor referred to as 1-FeOx-L2. Although this tunnel material has a lower thermal stability which is at 195 degrees Centigrade, its XRD pattern shows a relatively pure akaganeite-type material. It has also a needle-like morphology based on its scanning electron microscopy (SEM).
Abstract Format
html
Language
English
Format
Accession Number
TG03279
Shelf Location
Archives, The Learning Commons, 12F Henry Sy Sr. Hall
Physical Description
105 numb. leaves ; 28 cm.
Keywords
Iron oxides--Magnetic properties; Chemistry; Physical and theoretical; Chemical structure
Recommended Citation
Alfornon, P. (2001). Hydrothermal synthesis and characterization of an akaganeite-type iron oxide octahedral molecular sieves (FeOx-OMS) by direct dissolution and transformation of layered precursor to 2x2 tunnel structure. Retrieved from https://animorepository.dlsu.edu.ph/etd_masteral/2681