Physico-chemical characterization of agricultural residues as precursors for activated carbon preparation

IF 0.5 Q4 ENVIRONMENTAL SCIENCES
R. A. C. Flores, Francisco Prieto Garcia, E. O. Sánchez, A. M. B. Miró, O. Sandoval
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引用次数: 3

Abstract

Flores, R.A.C., F.P. García, E.M.O. Sánchez, A.M.B. Miró and O.A.A. Sandoval, 2018. Physico-chemical characterization of agricultural residues as precursors for activated carbon preparation. Bulg. J. Agric. Sci., 24 (3): 427–436 Biomass is a promising alternative and renewable energy source that can be transformed into other value-added products such as activated carbon. In this research, barley husk, corn cob and Agave salmiana leaves were characterized to determine their chemical composition and morphology to evaluate their potentiality as precursors of activated carbons. Based on the main composition results obtained, the biomass samples have suitable chemical and physical characteristics to be considered as good precursors of activated carbons, such as carbon contents greater than 40%, ash content less than 10%, moisture content less than 30%, high volatile contents with values from 75 to 80% and a porous and fi brous morphology. The results indicate that the main compositions in the biomass were cellulose and lignin. The cellulose content was more than lignin (15-26%) for the residues selected. Specifi cally, α-cellulose contents with values from 52% to 79%, β-cellulose contents of 13-44%, γ-cellulose contents less than 11%, and holocellulose contents of 82-83% were determined. The thermal decomposition for the biomass samples proceeded with fi ve stages attributed to the evaporation of some volatile compounds (70-150°C), to the degradation of hemicellulose (180-230°C), to the cellulose volatilization (250-350°C), to the lignin decomposition (380-550°C), and to the degradation of complex polymers and inorganic salts, respectively. The stage corresponding to the cellulose decomposition showed rapid mass decreased in the three residues. This results show that the cellulose and lignin content is another important parameter to evaluate the pyrolysis characteristics of a good precursor of activated carbon.
农业残留物作为活性炭制备前体的物理化学特性
弗洛雷斯,r.a.c., F.P. García, E.M.O. Sánchez, A.M.B. Miró和O.A.A.桑多瓦尔,2018。农业残留物作为活性炭制备前体的物理化学特性。Bulg。j·阿格利司。科学。生物质是一种很有前途的替代能源和可再生能源,可以转化为其他增值产品,如活性炭。本研究以大麦皮、玉米芯和龙舌兰叶为原料,对其化学成分和形态进行了表征,以评价其作为活性炭前体的潜力。根据获得的主要成分结果,生物质样品具有合适的化学和物理特征,如碳含量大于40%,灰分含量小于10%,水分含量小于30%,挥发分含量高,值在75%至80%之间,并且具有多孔和纤维状的形态,可以被认为是活性炭的良好前驱体。结果表明,生物质的主要成分为纤维素和木质素。所选残渣纤维素含量大于木质素(15-26%)。其中,α-纤维素含量为52% ~ 79%,β-纤维素含量为13 ~ 44%,γ-纤维素含量小于11%,全纤维素含量为82 ~ 83%。生物质样品的热分解过程分为5个阶段,分别为挥发性化合物的蒸发(70-150℃)、半纤维素的降解(180-230℃)、纤维素的挥发(250-350℃)、木质素的分解(380-550℃)以及复杂聚合物和无机盐的降解。纤维素分解对应的阶段在三个残留物中表现出快速的质量下降。结果表明,纤维素和木质素含量是评价活性炭前驱体热解特性的另一个重要参数。
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来源期刊
Bulgarian Journal of Agricultural Science
Bulgarian Journal of Agricultural Science Veterinary-General Veterinary
CiteScore
1.00
自引率
0.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: Bulgarian Journal of Agricultural Science (BJAS) is a peer-reviewed, open access, online and print journal, issued bimonthly. It has been published in English since 1995. It publishes original research papers, review articles and brief communications from all areas of agricultural science including agricultural economics, agroecology, agrochemisty and soil science, crop science, plant protection, animal science, veterinary medicine, fisheries and aquaculture, agricultural engineering, food technologies and other related areas.
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