A New Method of Synthesizing Black Birnessite Nanoparticles : From Brown to Black Birnessite with Nanostructures
Joint Authors
Okoh, Joseph M.
Joo, Sang Woo
Qian, Shizhi
Bhowmik, Pradip K.
Cheney, Marcos A.
Hou, Wensheng
Source
Issue
Vol. 2008, Issue 2008 (31 Dec. 2008), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2008-12-21
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Engineering Sciences and Information Technology
Chemistry
Civil Engineering
Abstract EN
A new method for preparing black birnessite nanoparticles is introduced.
The initial synthesis process resembles the classical McKenzie method of preparing brown birnessite except for slower cooling and closing the system from the ambient air.
Subsequent process, including wet-aging at 7∘C for 48 hours, overnight freezing, and lyophilization, is shown to convert the brown birnessite into black birnessite with complex nanomorphology with folded sheets and spirals.
Characterization of the product is performed by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), thermogravimetric analysis (TGA), and N2 adsorption (BET) techniques.
Wet-aging and lyophilization times are shown to affect the architecture of the product.
XRD patterns show a single phase corresponding to a semicrystalline birnessite-based manganese oxide.
TEM studies suggest its fibrous and petal-like structures.
The HRTEM images at 5 and 10 nm length scales reveal the fibrils in folding sheets and also show filamentary breaks.
The BET surface area of this nanomaterial was found to be 10.6 m2/g.
The TGA measurement demonstrated that it possessed an excellent thermal stability up to 400∘C.
Layer-structured black birnessite nanomaterial containing sheets, spirals, and filamentary breaks can be produced at low temperature (−49∘C) from brown birnessite without the use of cross-linking reagents.
American Psychological Association (APA)
Cheney, Marcos A.& Bhowmik, Pradip K.& Qian, Shizhi& Joo, Sang Woo& Hou, Wensheng& Okoh, Joseph M.. 2008. A New Method of Synthesizing Black Birnessite Nanoparticles : From Brown to Black Birnessite with Nanostructures. Journal of Nanomaterials،Vol. 2008, no. 2008, pp.1-8.
https://search.emarefa.net/detail/BIM-496915
Modern Language Association (MLA)
Cheney, Marcos A.…[et al.]. A New Method of Synthesizing Black Birnessite Nanoparticles : From Brown to Black Birnessite with Nanostructures. Journal of Nanomaterials No. 2008 (2008), pp.1-8.
https://search.emarefa.net/detail/BIM-496915
American Medical Association (AMA)
Cheney, Marcos A.& Bhowmik, Pradip K.& Qian, Shizhi& Joo, Sang Woo& Hou, Wensheng& Okoh, Joseph M.. A New Method of Synthesizing Black Birnessite Nanoparticles : From Brown to Black Birnessite with Nanostructures. Journal of Nanomaterials. 2008. Vol. 2008, no. 2008, pp.1-8.
https://search.emarefa.net/detail/BIM-496915
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-496915