不同制备温度的水稻生物炭电子交换能力研究

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Abstract

In order to explore their electron exchange capacity, the biochars were prepared from rice straw at different pyrolysis temperatures by limited oxygen heating carbonization, then respectively oxidized with oxygen and potassium ferricyanide oxidants, and reduced with titanium citrate. The electron accepting capacities (EAC) and electron donating capacities (EDC) were quantitatively analyzed. The results show that different pyrolysis temperatures could affect the electronic storage capacity. At 500℃, both EAC and EDC of biochars has been maximized, which were 3.86 and 1.72 mmol/g, respectively. When the pyrolysis temperature increased above 500℃, EAC and EDC both decreased accordingly. This phenomenon is due to the combined action of quinones and phenols functional groups and persistent free radicals in biochar. In addition, titanium citrate and sodium dithionite had different redox potential as reductants, which further confirmed the effect of reductant potential on EAC. The biochars had reversible redox property, the sum of EAC and EDC was approximately equal to the electronic storage capacity of biochar.

Key words： biochar electronic storage capacity electron accepting capacities (EAC) electron donating capacities (EDC) redox

Received: 01 April 2019

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X132

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	Articles by authors
	ZENG Liang
	WU Min
	WU Guo-juan

Cite this article:

ZENG Liang,WU Min,WU Guo-juan. Electron exchange capacity of rice biochar at different preparation temperatures[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(10): 4329-4336.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I10/4329

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