添加小麦秸秆生物炭对黄土吸附苯甲腈的影响

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Abstract

Benzonitrile was selected as the target pollutant to investigate the effect of biochar produced from wheat residue at different temperatures on the adsorption of benzonitrile onto loess soil. The results showed that the adsorption equilibrium of benzonitrile onto loess was about 8h without biochar, and after the addition of biochar into loess soil, the adsorption equilibrium time of benzonitrile was shortened, meanwhile, with the increase of pyrolysis temperature of biochar added into soil, the adsorption equilibrium time was obviously reduced, while the saturation adsorption amount of benzonitrile onto loess soil was also significantly increased. The kinetic data showed that the adsorption of benzonitrile onto loess soil could be better described by a pseudo-second-order kinetic model, the boundary layer control and intraparticle diffusion were both involved in the adsorption process. Besides, the adsorption equilibrium data were well described by the Freundlich isothermal model. The saturated adsorption capacity was improved as temperature increased with or without the biochar, suggesting a spontaneous endothermic process. The average adsorption free energy E was between 1.865and 3.171kJ/mol, which indicated that adsorption of benzonitrile onto loess was physical adsorption with or without biochar. Thermodynamic parameter analysis showed that Gibbs free energy was less than zero, while Entropy (ΔH^θ) and Enthalpy (ΔS^θ) were greater than zero, indicating an endothermic process for adsorption of benzonitrile onto loess soil. The results indicated that the adsorption process of benzonitrile onto loess with the addition of biochar involved a surface adsorption, diffusion within the particles, and external film diffusion mechanism.

Key words： loess soil benzonitrile adsorption kinetics adsorption thermodynamics adsorption mechanism

Received: 30 September 2015

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X53

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	Articles by authors
	JIANG Yu-feng
	UWAMUNGU J. Yves
	SUN Hang
	HU Xue-fei
	MU Zhong-feng
	ZHAN Hui-ying
	LIU Peng-yu

Cite this article:

JIANG Yu-feng,UWAMUNGU J. Yves,SUN Hang等. Effect of wheat-waste biochar on the adsorption behavior of benzonitrile onto loess soil[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(5): 1506-1513.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I5/1506

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