植物根际分泌有机酸对生物炭吸附Pb (Ⅱ)的影响

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Abstract Biochar is a solid product produced by pyrolysis of waste biomass under anaerobic oxygen conditions. Because of its porosity, large specific surface area, rich oxygen-containing functional groups, rich minerals and strong stability, biochar has been widely used in the remediation of heavy metal contaminated soils. The passivation effect of biochar on heavy metals is affected by not only the properties of heavy metals and biochar, but also organic acids secreted from plant rhizosphere in soil. However, the effects of organic acids on biochar-heavy metal interactions have not been studied limitedly. Therefore, in this paper, oxalic acid and citric acid were chosen as organic acids to explore the mechanisim on the adsorption behavior change of Pb(Ⅱ) on biochars (different pyrolysis temperatures at 200, 300, 400and 500℃). Comparing with the Freundlich model, the Langmuir model was more suitable for fitting the adsorption data of Pb(Ⅱ) on two types of biocharsi.e peanut shell biocarsand pine biochars. The peanut shell biocars prepared at 200℃ had maximum adsorption capacityon Pb(Ⅱ). The process of Pb(Ⅱ) adsorption by biocharswas spontaneous, the adsorption stability of peanut shell biocars was stronger than pine biochars, and the adsorption stability decreased as pyrolysis temperature increased. When the concentration of citric acid and oxalic acid was below 2.60×10^-2mmol/L and7.65×10^-2mmol/L respectively, the adsorbed organic acids would provide more binding sites for Pb(Ⅱ), thus promoting the adsorption of Pb(Ⅱ). When the concentration of organic acids increased, the internal pores of biochars may be occupied by the organic acids, which would compet for the binding sites of heavy metals and thereby inhibite the adsorption of Pb(Ⅱ) on biochars. This study will provide important basic information for systematically understanding the environmental effects of biochars, and will help to comprehensively evaluate the function of biochars in environmental remediation in the presence of organic acids.

Key words： biochar oxalic acid citric acid Pb(Ⅱ) adsorption

Received: 13 July 2018

PACS:

X131.3

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	ZHOU Dan-dan
	QU Fang-zhou
	WU Min
	CHU Gang
	WU Wen-wei

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ZHOU Dan-dan,QU Fang-zhou,WU Min等. Effects of organic acids secreted from plant rhizosphereon adsorption of Pb(Ⅱ) by biochars[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 1199-1207.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I3/1199

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