Comprehensive evaluation of rape straw biochar as slow-release carrier under different preparation conditions

doi:10.3969/j.issn.1004-1524.2023.04.16

Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (4): 893-902.DOI: 10.3969/j.issn.1004-1524.2023.04.16

• Environmental Science • Previous Articles Next Articles

Comprehensive evaluation of rape straw biochar as slow-release carrier under different preparation conditions

XU Yang^a(), REN Yilin^a^,^*(), WANG Haojie^a, HUANG Qiuhang^a, XING Boyuan^a, CAO Hongliang^b

a. Key Laboratory of Agricultural Equipment in Mid-Lower Yangtze River, Ministry of Agriculture and Rural Affairs, College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
b. Key Laboratory of Smart Farming for Agricultural Animals, Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan 430070, China

Received:2022-10-24 Online:2023-04-25 Published:2023-05-05

Abstract

Abstract:

In order to quantitatively evaluate the potential of rape straw biochar as a slow-release carrier, high-temperature cracking method was adopted to prepare biochar under different phosphoric acid volume fractions (5%, 10%, 15%), pyrolysis temperature (450, 550, 650 ℃) and holding time (40, 80, 120 min). The surface morphology, functional group composition and physicochemical properties of the prepared biochar were investigated. Then, a grey correlation method was introduced to comprehensively assess the potential of the prepared biochar as a slow-release carrier. The results showed that with the increase of phosphoric acid volume fraction, pyrolysis temperature and holding time, the carbon yield, water content and volatile fraction gradually decreased, while the contents of ash and fixed carbon increased. Based on the results of grey correlation analysis and the influences of phosphoric acid volume fraction, pyrolysis temperature and holding time on biochar yield, the biochar prepared under the conditions when the phosphoric acid volume fraction was 10%, the pyrolysis temperature was 450 ℃, and the holding time was 80 min, had the maximum potential to be used as a slow-release carrier.

Key words: biochar, physicochemical properties, slow-release potential, grey correlation method, rape straw

CLC Number:

S509.9
X705

XU Yang, REN Yilin, WANG Haojie, HUANG Qiuhang, XING Boyuan, CAO Hongliang. Comprehensive evaluation of rape straw biochar as slow-release carrier under different preparation conditions[J]. Acta Agriculturae Zhejiangensis, 2023, 35(4): 893-902.

Figures/Tables 6

References 46

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样品 Sample	炭得率 Biochar yield	全水分 Moisture content	灰分 Ash content	挥发分 Volatile content	固定碳 Fixed carbon
5PRS-BC550-HT80	38.80	3.27	20.70	12.08	63.95
10PRS-BC550-HT80	37.70	3.13	22.35	10.52	64.00
15PRS-BC550-HT80	37.65	2.76	23.46	10.08	63.70
10PRS-BC450-HT80	39.00	5.01	17.57	17.23	60.19
10PRS-BC550-HT80	37.70	3.16	22.11	14.52	60.21
10PRS-BC650-HT80	36.25	2.79	24.26	12.63	60.32
10PRS-BC550-HT40	38.05	3.81	18.06	17.47	60.65
10PRS-BC550-HT80	37.70	3.08	19.11	10.52	67.29
10PRS-BC550-HT120	37.75	2.43	19.19	10.46	67.92

样品 Sample	炭得率 Biochar yield	全水分 Moisture content	灰分 Ash content	挥发分 Volatile content	固定碳 Fixed carbon
5PRS-BC550-HT80	38.80	3.27	20.70	12.08	63.95
10PRS-BC550-HT80	37.70	3.13	22.35	10.52	64.00
15PRS-BC550-HT80	37.65	2.76	23.46	10.08	63.70
10PRS-BC450-HT80	39.00	5.01	17.57	17.23	60.19
10PRS-BC550-HT80	37.70	3.16	22.11	14.52	60.21
10PRS-BC650-HT80	36.25	2.79	24.26	12.63	60.32
10PRS-BC550-HT40	38.05	3.81	18.06	17.47	60.65
10PRS-BC550-HT80	37.70	3.08	19.11	10.52	67.29
10PRS-BC550-HT120	37.75	2.43	19.19	10.46	67.92

样品Sample	H/C	O/C	(O+N)/C
5PRS-BC550-HT80	0.036	0.017	0.023
10PRS-BC550-HT80	0.027	0.020	0.026
15PRS-BC550-HT80	0.019	0.028	0.032
10PRS-BC450-HT80	0.032	0.051	0.052
10PRS-BC550-HT80	0.027	0.041	0.046
10PRS-BC650-HT80	0.023	0.015	0.021
10PRS-BC550-HT40	0.031	0.043	0.047
10PRS-BC550-HT80	0.030	0.025	0.028
10PRS-BC550-HT120	0.027	0.012	0.014

样品Sample	H/C	O/C	(O+N)/C
5PRS-BC550-HT80	0.036	0.017	0.023
10PRS-BC550-HT80	0.027	0.020	0.026
15PRS-BC550-HT80	0.019	0.028	0.032
10PRS-BC450-HT80	0.032	0.051	0.052
10PRS-BC550-HT80	0.027	0.041	0.046
10PRS-BC650-HT80	0.023	0.015	0.021
10PRS-BC550-HT40	0.031	0.043	0.047
10PRS-BC550-HT80	0.030	0.025	0.028
10PRS-BC550-HT120	0.027	0.012	0.014

样品Smple	ε₁	ε₂	ε₃	ε₄	关联度Degree of relevance
5PRS-BC550-HT80	0.333	0.333	0.790	0.598	0.513
10PRS-BC550-HT80	0.524	0.344	0.723	0.464	0.514
15PRS-BC550-HT80	1.000	0.478	0.559	0.333	0.593
10PRS-BC450-HT80	0.405	1.000	0.333	1.000	0.685
10PRS-BC550-HT80	0.529	0.372	0.401	0.851	0.538
10PRS-BC650-HT80	0.700	0.351	0.879	0.475	0.601
10PRS-BC550-HT40	0.419	0.478	0.387	0.727	0.503
10PRS-BC550-HT80	0.446	0.589	0.597	0.577	0.552
10PRS-BC550-HT120	0.532	0.900	1.000	0.527	0.740

Comprehensive evaluation of rape straw biochar as slow-release carrier under different preparation conditions

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