灰分对挺水植物生物炭吸附硫丹的影响

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Abstract The Influence of biochars with relatively high ash contents on the fate of α-endosulfan and β-endosulfan with original biochars derive from three feedstocks (canna indical,acorus calamus, and phragmites autralias)at heat treatment temperature 550℃ was evaluated. The pores of biochars were mainly mesoporous, and the ash occupied about15.86~27.29%, whose main composition were probably calcium carbonate. The nonlinear adsorption constant of biochars to endosulfan was from 0.63 to 0.80, which was a bit higher than that of deashed biochars (0.63~0.80). Besides, after deashed, the affinity between biochars and β-endosulfan or α-endosulfan weakened and the adsorption capacity was limited (logK_F ranged from 6744 to 11111mg/kg). In addition, the value of (O+N)/C decreased, the proportion of surface -C and bulk -C increased, indicating that deashing could reduce the polarity of carbon surface, increased the hydrophobicity, and expose more organic matter on surface, which would enhance the hydrophobicity of endosulfan. After adding to supernatant, the adsorption of endosulfan by deashed biochars dramatically improved, it also proved that the soluble substance in the supernatant were much likely enhance the adsorption effect between deashed biochars and endosulfan.

Key words： ash biochars endosulfan hydrophobic adsorption

Received: 14 January 2018

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Corresponding Authors: 卢少勇,研究员,lushy2000@163.com E-mail: lushy2000@163.com

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	HE Qi
	LU Shao-yong
	CHEN Fang-xin
	CAO Feng-mei

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HE Qi,LU Shao-yong,CHEN Fang-xin等. Influence of ash on adsorption of endosulfan by biochars derived from emergent plants[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(6): 2314-2320.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I6/2314

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