污泥基生物炭导电性能的构效机制研究

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Abstract In this study, the structure-activity mechanism between the degree of aromatization, degree of defect, surface functional groups and the electrical conductivity of sludge-based biochar was explored through the regulation of preparation process parameters. The results showed that higher the degree of aromatization of sludge-based biochar, the better the π-π conjugated structure was for electron transfer and thus the stronger the conductivity. Meanwhile, contrary to the law of pure biochar, the degree of defects of biochar increased with the increase of pyrolysis temperature. Combined with XRD analysis of the composition of sludge based biochar, this law may be related to the distribution of refractory substances in sludge on the surface of biochar. When the pyrolysis temperature was 900℃ and the pyrolysis time was 30min, the resistivity of biochar prepared was only 6.834 Ω· cm, which is very close to that of pure biochar. Electrochemical tests showed that biochar prepared at low temperature (≤600℃) may mainly complete electron transfer through redox groups or metals on the surface, while biochar prepared at high temperature (>600℃) may depend on its graphitization structure to complete electron conduction.

Key words： sludge biochar conductive biological drying

Received: 27 August 2022

PACS:

X703.5

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	Articles by authors
	ZHANG Shan
	LI Ning
	HUANG Ting
	SU Ming-xue

Cite this article:

ZHANG Shan,LI Ning,HUANG Ting等. Structure-activity mechanism of electrical conductivity of sludge-based biochar[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1773-1781.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I4/1773

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