农田土壤中生物质炭的老化及其对有机污染物吸附-解吸影响的研究进展

发布时间：2018-01-31 04:11

本文关键词： 生物质炭土壤老化有机污染物吸附解吸　出处：《土壤》2017年05期 　论文类型：期刊论文

【摘要】：生物质炭独特的表面性质、形貌结构及丰富而离散的孔隙系统使其对有机污染物具有良好的持留与吸附作用,可望用于土壤污染控制与修复。在田间条件下,进入土壤的生物质炭自身不稳定组分会发生转化、淋溶,并与土壤发生相互作用出现老化现象,导致生物质炭的化学与物理性质发生显著变化。生物质炭在土壤中的老化过程具有复杂性和多样性,主要包括:生物质炭化学性质的变化,如无机元素的流失、表面官能团组成的变化以及部分矿化反应;生物质炭物理性质的改变,主要是土壤有机质和矿物质对生物质炭的包覆作用造成生物质炭的孔隙特征发生改变。生物质炭在土壤中的老化可能会导致有机污染物的吸附-解吸行为发生改变,且受土壤、生物质炭以及污染物性质的影响较大。本文综述了生物质炭在农田土壤中的老化机理及主要影响因素研究方面的进展,总结了生物质炭在土壤中的老化对有机污染物吸附-解吸行为的影响,提出了尚待解决的相关前沿科学问题。
[Abstract]:Because of its unique surface properties, morphological structure and abundant and discrete pore system, biomass carbon has good retention and adsorption to organic pollutants, which is expected to be used in soil pollution control and remediation. The biomass carbon which enters the soil itself is transformed, leached, and the interaction with the soil appears aging phenomenon. The aging process of biomass carbon in soil is complex and diverse, including the change of chemical properties of biomass carbon, such as the loss of inorganic elements. Changes in composition of surface functional groups and partial mineralization reactions; The change of physical properties of biomass carbon. The pore characteristics of biomass carbon are changed due to the coating of soil organic matter and minerals on biomass carbon. The aging of biomass carbon in soil may result in the modification of adsorption-desorption behavior of organic pollutants. Change. In this paper, the aging mechanism of biomass carbon in farmland soil and its main influencing factors were reviewed. The effects of biomass carbon aging on adsorption and desorption behavior of organic pollutants in soil were summarized.
【作者单位】：西南交通大学地球科学与环境工程学院;中国科学院水利部成都山地灾害与环境研究所;
【基金】：国家自然科学基金项目(21307152,41471268) 高等学校博士学科点专项科研基金项目(20130184110027)资助
【分类号】：X53
【正文快照】： 生物质炭是在无氧或低氧的条件下,将生物质热解炭化得到的一种多孔富碳固体[1]。生物质炭含碳量高,比表面积大,孔隙度高,表面官能团丰富,作为一种新的环境友好型土壤改良剂,其所表现出的修复污染土壤的潜力引起了研究者的广泛关注[2-5]。近年来,关于生物质炭应用于土壤污染修

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