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Comparisons of activated carbons produced from sycamore balls, ripe black locust seed pods, and Nerium oleander fruits and also their H 2 storage studies
Carbon Letters ( IF 4.5 ) Pub Date : 2020-05-18 , DOI: 10.1007/s42823-020-00151-z
Osman Üner , Ünal Geçgel , Tarık Avcu

Starting materials are very significant to produce activated carbons because every starting material has a different chemical structure; hence they affect the surface functional groups and surface morphologies of obtained activated carbons. In this study, sycamore balls, ripe black locust seed pods, and Nerium oleander fruits have been used as starting materials by ZnCl2 chemical activations for the first time. Firstly, activated carbons were obtained from these starting materials with ZnCl2 chemical activation by changing production conditions (carbonization time, carbonization temperature, and impregnation ratio) also affecting the structural and textural properties of the resultant activated carbons. Then, the starting materials and resultant activated carbons were characterized by utilizing diverse analysis techniques, such as TGA, elemental analysis, proximate analysis, BET surface areas, pore volumes, pore size distributions, N2 adsorption–desorption isotherms, SEM, FTIR spectra, and H2 adsorption isotherms. The highest surface areas were determined to be 1492.89, 1564.84, and 1375.47 m2/g for the activated carbons obtained from sycamore balls, ripe black locust seed pods, and N. oleander fruits, respectively. The yields of these activated carbons with the highest surface areas were calculated to be around 40%. As the carbonization temperature increased with sufficient ZnCl2 amount, N2 adsorption–desorption isotherms began to turn into Type IV isotherms given by mesoporous adsorbents with its hysteresis loops. Also, their hysteresis loops resembled Type H4 loop generally associated with narrow slit-like pores. Moreover, hydrogen uptakes under 750 mmHg at 77 K were determined to be 1.31, 1.48, and 1.24 wt% for the activated carbons with the maximum surface areas produced from sycamore balls, ripe black locust seed pods, and N. oleander fruits, respectively. As a result, the highest surface areas of the activated carbons with different structural properties produced in this study were obtained with different production conditions.



中文翻译:

无花果球,成熟的刺槐种子荚和夹竹桃果实产生的活性炭的比较以及它们的H 2储存研究

起始原料对于生产活性炭非常重要,因为每种起始原料都有不同的化学结构。因此它们影响获得的活性炭的表面官能团和表面形态。在这项研究中,无花果球,成熟的刺槐种子荚和夹竹桃果实已被首次用作通过ZnCl 2化学活化的原料。首先,从这些原料中用ZnCl 2获得活性炭通过改变生产条件(碳化时间,碳化温度和浸渍比)进行化学活化,也会影响所得活性炭的结构和织构性质。然后,利用多种分析技术,如TGA,元素分析,近似分析,BET表面积,孔体积,孔径分布,N 2吸附-解吸等温线,SEM,FTIR光谱,对起始原料和所得活性炭进行表征。和H 2吸附等温线。从无花果球,成熟的刺槐种子荚和夹竹桃中获得的活性炭的最高表面积被确定为1492.89、1564.84和1375.47 m 2 / g 水果分别。这些具有最高表面积的活性炭的产率经计算为约40%。随着碳化温度的升高和足够多的ZnCl 2的加入,N 2的吸附-解吸等温线开始转变为具有滞后回线的介孔吸附剂给出的IV型等温线。而且,它们的磁滞回线类似于通常与狭窄的狭缝状孔相关的H4型回线。此外,在活性炭中,在750 mmHg下,氢气的吸收量被确定为1.31、1.48和1.24 wt%,其中最大的表面积由无花果球,成熟的刺槐种子荚和夹竹桃产生。水果分别。结果,在不同的生产条件下获得了本研究中生产的具有不同结构特性的活性炭的最高表面积。

更新日期:2020-05-18
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