Biochars prepared from biogas residues: temperature is a crucial factor that determines their physicochemical properties
文献类型： 外文期刊
作者： Cong, Ping 1 ; Song, Shuhui 2 ; Song, Wenjing 1 ; Dong, Jianxin 1 ; Zheng, Xuebo 1 ;
作者机构： 1.Chinese Acad Agr Sci, Key Lab Tobacco Biol & Proc, Minist Agr & Rural Affairs, Tobacco Res Inst, Qingdao 266101, Peoples R China
2.Chinese Acad Trop Agr Sci, South Subtrop Crops Res Inst, Minist Agr & Rural Affairs, Zhanjiang 524000, Peoples R China
关键词： Biogas residue; Biochar; Pyrolysis temperature; Yield; Physicochemical properties
期刊名称：BIOMASS CONVERSION AND BIOREFINERY （ 影响因子：4.05； 五年影响因子：4.103 ）
ISSN： 2190-6815
年卷期：
页码：
收录情况： SCI
摘要： The quantity of biogas residues is continually increasing and causing a great threat to the environmental protection and sustainable development of bio-natural gas engineering. Thus, four biogas residues (sewage sludge, SR; spent mushroom compost, MR; wheat straw, STR; distillers' grains, DL) were collected to prepare biochars at different temperatures (300 degrees C, 500 degrees C, and 700 degrees C) in this study. The functional groups, crystal structure, and physical and chemical properties of biochars were characterized to evaluate the suitability of preparing biochar from different biogas residues. The results showed that the biochar yield ranged from 45.13 to 66.42% at 300 degrees C, 34.13 to 51.50% at 500 degrees C, and 30.33% to 47.06% at 700 degrees C. The carbon (C) content in STR and DL biochar increased under higher temperatures. Further, with increasing temperature, the P and K contents, pH, Brunauer-Emmett-Teller surface area (S-BET), and total pore volume (TPV) increased. The functional groups of the STR biochar decreased significantly, and the aromatic compounds were decomposed. The biochar (except SR biochar) structures were more stable under high temperature. The morphological structure of DL biochar at 700 degrees C was the most stable. The S-BET of four biochars at 700 degrees C increased 11.98- to 33.43-fold compared with that at 300 degrees C. And the TPV of four biochars at 700 degrees C increased 2.22 to 10.25 times that at 300 degrees C. STRB700 has higher S-BET, because C-H bond stretching in aliphatic formation and C = C stretching in hemicelluloses in STRB relatively decomposed under high temperature (300 degrees C and 500 degrees C), especially under 700 degrees C. The high temperature is favourable to the formation of smaller microporous.
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