Physicochemical characterization of maize tassel as an adsorbent. I. Surface texture, microstructure, and thermal stability

Autor:	Jonathan O. Okonkwo, Pride N. Shabalala, Caliphs Zvinowanda, Nana M. Agyei
Rok vydání:	2009
Předmět:	Polymers and Plastics Chemistry Thermal decomposition Analytical chemistry General Chemistry Surfaces Coatings and Films Thermogravimetry Adsorption Differential scanning calorimetry Specific surface area Differential thermal analysis Materials Chemistry Thermal stability Particle size
Zdroj:	Journal of Applied Polymer Science. 111:1923-1930
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.29213
Popis:	In this study, various physicochemical pa- rameters were evaluated for maize tassel, a novel adsorbent. The Brunauer-Emmett-Teller (BET) isotherm was used to experimentally model N2-adsorption data (up to a relative pressure of 0.30); the results indicated that the powdered ma- terial was mesoporous with a BET specific surface area, total pore volume (up to a relative pressure of 0.98), and average pore width (4V/A by BET) of 2.52 m 2 /g, 0.0045 cm 3 /g, and 7.2 nm, respectively, for the 150-300-lm fraction. Laser dif- fraction pattern analysis yielded particle size distributions for the 45-50-, 50-150-, and 150-300-lm fractions. High-reso- lution scanning electron microscopy revealed a microstruc- ture showing predominantly flattish, rodlike particles. The material exhibited stability to thermal decomposition up to about 230 � C, as evidenced by the results obtained from si- multaneous thermogravimetry/differential thermal analysis and differential scanning calorimetry. V C 2008 Wiley Periodicals
Databáze:	OpenAIRE
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