Modeling and Characterization of Steam-Activated Carbons Developed from Cotton Stalks

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon Letters / 14권 / 1호
ㆍ저자명 : A.M.Youssef, A.F.Hassan, M.Safan

목차

1. Introduction
2. Experimental
2.1. Preparation of steam-AC samples
2.2. Techniques
3. Results and Discussion
3.1. Textural characterization of carbons
3.2. Ash content, pH of supernatant, pHpzc, and base neutralization capacities
3.3. FTIR investigation
3.4. Mathematical modeling
4. Conclusions

영어 초록

Physically and chemically activated carbons (ACs) exhibited high adsorption capacities for organic and inorganic pollutants compared with other adsorbents due to their expanded surface areas and wide pore volume distribution. In this work, seven steam-ACs with different burn-off have been prepared from cotton stalks. The textural properties of these sorbents were determined using nitrogen adsorption at -196°C .The chemistry of the surface of the present sorbents was characterized by determining the surface functional C-O groups using Fourier transform infrared spectroscopy, surface pH, pHpzc, and Boehm’s acid-base neutralization method. The textural properties and the morphology of the sorbent surface depend on the percentage of burn-off. The surface acidity and surface basicity are related to the burn-off percentage. A theoretical model was developed to find a mathematical expression that relates the % burn-off to ash content, surface area, and mean pore radius. Also, the chemistry of the carbon surface is related to the % burn-off. A mathematical expression was proposed where % burn-off was taken as an independent factor and the other variable as a dependent factor. This expression allows the choice of the value of % burn-off with required steam-AC properties.

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