玉米秸秆和玉米芯生物炭对水溶液中无机氮的吸附性能

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Abstract

In order to explore the adsorption characters of inorganic nitrogen in aqueous solution by maize straw- and corn cob-derived biochars, the adsorption kinetics of NH₄⁺-N, NO₃^--N and NO₂^--N were studied. The adsorption processes of NH₄⁺-N and NO₃^--N were fitted by Langmuir and Freundlich isothermal adsorption models, and the adsorption mechanisms were also elucidated. The results showed that the maize straw- and corn cob-derived biochars produced at 400℃ and 600℃ were both alkaline (400℃ < 600℃). As for the same raw material, the biochar produced at 600℃ showed relatively higher alkaline oxygen-containing functional group content and lower acidic oxygen-containing functional group content compared with the biochar produced at 400℃. The biochars produced at 400℃ had a stronger adsorption capacity to NH₄⁺-N (the equilibrium adsorption amounts of maize straw- and corn cob-derived biochars were 4.22 and 4.09mg/g, respectively). However, the biochars produced at 600℃ had a stronger adsorption capacity to NO₃^--N and NO₂^--N (for NO₃^--N: the equilibrium adsorption amounts of maize straw- and corn cob-derived biochars were 0.73 and 0.63mg/g, respectively; for NO₂^--N: 0.55and 0.35mg/g, respectively). Compared to NO₃^--N and NO₂^--N, all the four kinds of biochar showed stronger adsorption capacity to NH₄⁺-N, and the equilibrium adsorption amounts of NH₄⁺-N were 4.29~20.2 times more than NO₃^--N/NO₂^--N. The isothermal adsorption model study showed that the adsorption of NH₄⁺-N and NO₃^--N in aqueous solution by maize straw- and corn cob-derived biochars could be described by Freundlich model, and the multi-layer adsorption was the major adsorption mechanism.

Key words： biochar inorganic nitrogen adsorption character oxygen-containing functional group

Received: 15 May 2015

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X53

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	WU Li-jun
	WANG Chao-xu
	ZHANG Feng
	CUI Jian-guo

Cite this article:

WU Li-jun,WANG Chao-xu,ZHANG Feng等. The adsorption characters of inorganic nitrogen in aqueous solution by maize straw- and corn cob-derived biochars[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(1): 74-81.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I1/74

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