X-ray Diffraction Patterns of Activated Carbons Prepared under Various Conditions
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서지정보
ㆍ발행기관 : 한국탄소학회
ㆍ수록지정보 : Carbon Letters / 8권 / 2호
ㆍ저자명 : Badie S. Girgis1, Yassin M. Temerk, Mostafa M. Gadelrab, Ibrahi
ㆍ저자명 : Badie S. Girgis1, Yassin M. Temerk, Mostafa M. Gadelrab, Ibrahi
목차
1. Introduction2. Materials and Methods
3. Results and Discussion
References
한국어 초록
A series of activated carbons (ACs) were derived from sugarcane bagasse under two activation schemes: steam-pyrolysis at 600-800°C and chemical activation with H3PO4 at 500°C. Some carbons were treated at 400, 600°C, or for 1-3 h, and/or in flowing air during pyrolysis of acid-impregnated mass. XRD profiles displayed two broad diffuse bands centered around2θ = 23 and 43°, currently associated with diffraction from the 002 and 100/101 set of planes in graphite, respectively. These correspond to the interlayer spacing, Lc, and microcrystallite lateral dimensions, La, of the turbostratic (fully disordered) graphene layers. Steam pyrolysis-activated carbons exhibit only the two mentioned broad bands with enhancement in number
of layers, with temperature, and small decrease in microcrystallite diameter, La. XRD patterns of H3PO4-ACs display more developed and separated peaks in the early region with maxima at 2θ = 23, 26 and 29°, possibly ascribed to fragmented microcrystallites (or partially organized structures). Diffraction within the 2θ = 43° is still broad although depressed and diffuse, suggesting that the intragraphitic layers are less developed. Varying the conditions of chemical activation inflicts insignificant structural alterations. Circulating air during pyrolysis leads to enhancement of the basic graphitic structure with destruction and degradation in the lateral dimensions.
Keywords : Activated carbon, H3PO4-activation, steam pyrolysis, graphite structure, X-ray diffraction
영어 초록
A series of activated carbons (ACs) were derived from sugarcane bagasse under two activation schemes: steam-pyrolysis at 600-800°C and chemical activation with H3PO4 at 500°C. Some carbons were treated at 400, 600°C, or for 1-3 h, and/or in flowing air during pyrolysis of acid-impregnated mass. XRD profiles displayed two broad diffuse bands centered around2θ = 23 and 43°, currently associated with diffraction from the 002 and 100/101 set of planes in graphite, respectively. These correspond to the interlayer spacing, Lc, and microcrystallite lateral dimensions, La, of the turbostratic (fully disordered) graphene layers. Steam pyrolysis-activated carbons exhibit only the two mentioned broad bands with enhancement in numberof layers, with temperature, and small decrease in microcrystallite diameter, La. XRD patterns of H3PO4-ACs display more developed and separated peaks in the early region with maxima at 2θ = 23, 26 and 29°, possibly ascribed to fragmented microcrystallites (or partially organized structures). Diffraction within the 2θ = 43° is still broad although depressed and diffuse, suggesting that the intragraphitic layers are less developed. Varying the conditions of chemical activation inflicts insignificant structural alterations. Circulating air during pyrolysis leads to enhancement of the basic graphitic structure with destruction and degradation in the lateral dimensions.Keywords : Activated carbon, H3PO4-activation, steam pyrolysis, graphite structure, X-ray diffraction참고 자료
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