不同秸秆生物炭的孔隙结构及其差异

doi:10.3969/j.issn.1673-5854.2019.02.007

Abstract

Abstract:

Based on the cryogenic nitrogen gas adsorption method, the pore characteristics of biochars made from farmland waste including rice straw, corn stalk and wheat straw were studied. The BET equation, BJH equation and t-plot method were used to caculate the specific surface area, pore size distribution and microporous parameters, and FHH model was used to obtain the fractal dimension(D) of pore. Results showed that different temperature and different materials all had larger effects on the pore characteristics of biochar. With the increase of pyrolysis temperature, the BET specific surface area and pore volume of rice-straw-biochar and wheat-straw-biochar increased firstly and then decreased, whereas, the porosity of corn-stalk-biochar always increased. It was concluded that the mesopores were the main type of pores in three kinds of biochars and the pores mainly consisted of the second pores. It was found that rice-straw-biochar, corn-stalk-biochar and wheat-straw-biochar all had good fractal characteristics, and the pore fractal dimensions were 2.545 4-2.669 3, 2.629 7-2.689 5 and 2.577 3-2.597 2, respectively, which reflected the complexity and heterogeneity of the biochar porosity. Both rice-straw-biochar and wheat-straw-biochar had higher fractal dimension at 500 ℃(2.669 3 and 2.597 2), but corn-stalk-biochar had higher fractal dimension at 700 ℃(2.689 5).

Key words: Kcrop straw, biochar, pore characteristics, fractal dimension

CLC Number:

TQ35

Xiefeng YE,Xiaona YU,Hanjun ZHOU,Zhipeng LI,Xiaofan ZHANG. Pore Structure and Fractal Characteristics of Biochars From Different Straw[J]. Biomass Chemical Engineering, 2019, 53(2): 41-46.

Figures/Tables 6

Table 1

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References 32

1	宋大利, 侯胜鹏, 王秀斌, 等. 中国秸秆养分资源数量及替代化肥潜力[J]. 植物营养与肥料学报, 2018, 24 (1): 1- 21.
2	曹国良, 张小曳, 王亚强, 等. 中国区域农田秸秆露天焚烧排放量的估算[J]. 科学通报, 2007, 52 (15): 1826- 1831. doi: 10.3321/j.issn:0023-074x.2007.15.017
3	曹国良, 张小曳, 王丹, 等. 中国大陆生物质燃烧排放的污染物清单[J]. 中国环境科学, 2005, 25 (4): 389- 393. doi: 10.3321/j.issn:1000-6923.2005.04.002
4	徐楠楠, 林大松, 徐应明, 等. 生物炭在土壤改良和重金属污染治理中的应用[J]. 农业资源与环境学报, 2013, (4): 29- 34. doi: 10.3969/j.issn.1005-4944.2013.04.006
5	BRAIDA W J , PIGNATELLO J J , YUEFENG L , et al. Sorption hysteresis of benzene in charcoal particles[J]. Environmental Science&Technology, 2003, 37 (2): 409- 417.
6	SCHMIDT M W I , NOACK A G . Black carbon in soils and sediments:Analysis, distribution, implications, and current challenges[J]. Global Biogeochemical Cycles, 2000, 14 (3): 777- 793. doi: 10.1029/1999GB001208
7	TITIRICI M M , THOMAS A , YU S H , et al. A direct synthesis of mesoporous carbons with bicontinuous pore morphology from crude plant material by hydrothermal carbonization[J]. Chemistry of Materials, 2007, 19 (17): 4205- 4212. doi: 10.1021/cm0707408
8	GERARD C , ZOFIA K , STAVROS K , et al. Relations between environmental black carbon sorption and geochemical sorbent characteristics[J]. Environmental Science&Technology, 2004, 38 (13): 3632- 3640.
9	汪青. 土壤和沉积物中黑碳的环境行为及效应研究进展[J]. 生态学报, 2012, 32 (1): 293- 310.
10	谢祖彬, 刘琦, 许燕萍, 等. 生物炭研究进展及其研究方向[J]. 土壤, 2011, 43 (6): 857- 861.
11	梁桓, 索全义, 侯建伟, 等. 不同炭化温度下玉米秸秆和沙蒿生物炭的结构特征及化学特性[J]. 土壤, 2015, (5): 886- 891.
12	俞花美, 陈淼, 邓惠, 等. 蔗渣基生物质炭的制备、表征及吸附性能[J]. 热带作物学报, 2014, 35 (3): 595- 602. doi: 10.3969/j.issn.1000-2561.2014.03.029
13	林晓芬, 张军, 尹艳山, 等. 生物质炭孔隙分形特征研究[J]. 生物质化学工程, 2009, 43 (3): 9- 12.
14	CETIN E , MOGHTADERI B , GUPTA R , et al. Influence of pyrolysis conditions on the structure and gasification reactivity of biomass chars[J]. Fuel, 2004, 83 (16): 2139- 2150. doi: 10.1016/j.fuel.2004.05.008
15	陈再明, 陈宝梁, 周丹丹. 水稻秸秆生物碳的结构特征及其对有机污染物的吸附性能[J]. 环境科学学报, 2013, 33 (1): 9- 19.
16	张伟明.生物炭的理化性质及其在作物生产上的应用[D].沈阳:沈阳农业大学, 2012: 26-30.
17	安增莉.生物炭的制备及其对Pb (Ⅱ)的吸附特性研究[D].厦门:华侨大学, 2011: 11-21.
18	刘永忠, 陈三强, 孙皓. 冻干物料孔隙特性表征的分形模型与分形维数[J]. 农业工程学报, 2004, 20 (6): 41- 45. doi: 10.3321/j.issn:1002-6819.2004.06.010
19	PFEIFER P , AVNIR D . Erratum:Chemistry in noninteger dimensions between two and three.Ⅰ.Fractal theory of heterogeneous surfaces[J]. Journal of Chemical Physics, 1984, 80 (7): 3558- 3565.
20	朱文魁, 张双全, 唐志红, 等. 气体吸附法研究活性炭表面分形维数[J]. 炭素, 2004, (2): 12- 15. doi: 10.3969/j.issn.1001-8948.2004.02.002
21	HOSSAIN M K , STREZOV V , CHAN K Y , et al. Influence of pyrolysis temperature on production and nutrient properties of wastewater sludge biochar[J]. Journal of Environmental Management, 2011, 92 (1): 223- 228. doi: 10.1016/j.jenvman.2010.09.008
22	徐勇, 吕成福, 陈国俊, 等. 川东南龙马溪组页岩孔隙分形特征[J]. 岩性油气藏, 2015, 27 (4): 32- 39. doi: 10.3969/j.issn.1673-8926.2015.04.005
23	安增莉, 侯艳伟, 蔡超, 等. 水稻秸秆生物炭对Pb (Ⅱ)的吸附特性[J]. 环境化学, 2011, 30 (11): 1851- 1857.
24	郭平, 王观竹, 许梦, 等. 不同热解温度下生物质废弃物制备的生物质炭组成及结构特征[J]. 吉林大学学报:理学版, 2014, (4): 855- 860.
25	罗煜, 赵立欣, 孟海波, 等. 不同温度下热裂解芒草生物质炭的理化特征分析[J]. 农业工程学报, 2013, (13): 208- 217. doi: 10.3969/j.issn.1002-6819.2013.13.027
26	孙红文. 生物炭与环境[M]. 北京: 化学工业出版社, 2013: 82.
27	黄华, 王雅雄, 唐景春, 等. 不同烧制温度下玉米秸秆生物炭的性质及对萘的吸附性能[J]. 环境科学, 2014, 35 (5): 1884- 1890.
28	刘辉, 吴少华, 孙锐, 等. 快速热解褐煤焦的比表面积及孔隙结构[J]. 中国电机工程学报, 2005, 25 (12): 86- 90. doi: 10.3321/j.issn:0258-8013.2005.12.016
29	近藤精一. 吸附科学[M]. 北京: 化学工业出版社, 2006.
30	严继民. 吸附与凝聚[M]. 北京: 科学出版社, 1986.
31	赵瑞方, 华坚, 陈放, 等. 麻风树果壳活性炭表面分形维数的实验研究[J]. 安全与环境学报, 2008, 8 (2): 51- 54. doi: 10.3969/j.issn.1009-6094.2008.02.014
32	刘娟, 胡小芳. 活性炭吸附性能与其粒度分布分形维数的关系研究[J]. 材料导报, 2010, 24 (12): 73- 75.

样品¹⁾ samples	热解温度/℃ pyrolysis temperature	BET比表面积/ (m²·g^-1) BET specific surface area	总孔容/ (cm³·g^-1) total pore volume	平均孔径/nm average pore size	微孔孔容/ (cm³·g^-1) micropore volume	中孔孔容/ (cm³·g^-1) mesopore volume
RC300	300	4.211	0.007	4.152	—	0.010
RC500	500	13.127	0.026	13.377	0.002	0.038
RC700	700	7.017	0.008	1.543	0.002	0.012
CC300	300	1.559	0.002	1.847	0.001	0.003
CC500	500	2.748	0.003	1.847	—	0.006
CC700	700	6.429	0.007	1.543	0.001	0.010
WC300	300	3.065	0.005	1.847	0.001	0.007
WC500	500	6.601	0.010	2.769	0.001	0.017
WC700	700	3.871	0.005	1.614	0.001	0.110

样品sample	A	D₁	R²
RC300	-0.455	2.5454	0.997
RC500	-0.331	2.6693	0.974
RC700	-0.431	2.5691	0.976
CC300	-0.358	2.6417	0.983
CC500	-0.370	2.6297	0.987
CC700	-0.310	2.6895	0.994
WC300	-0.423	2.5773	0.993
WC500	-0.403	2.5972	0.987
WC700	-0.408	2.5920	0.972

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[8]	LI Bao-qiang;LIU Jun;LI Rui-yang;LI Wen-dong;FENG Yu-jie;GONG Jin-xin. Biochars Preparation and Its Applications in Energy and Environment Field [J]. , 2012, 46(1): 34-38.

Pore Structure and Fractal Characteristics of Biochars From Different Straw

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