长江流域资源与环境 >> 2011, Vol. 20 >> Issue (06): 768-.

• 生态环境 • 上一篇    

原煤及富碳沉积物对疏水性有机污染物吸附解吸研究进展

晏彩霞| 杨毅| 刘敏| 聂明华| 付佳露   

  1. (华东师范大学资源与环境学院地理信息科学教育部重点实验室|上海 200062)
  • 出版日期:2011-06-20

RESEARCH PROGRESS IN HOCs SORPTION/DESORPTION BEHAVIOR OF COAL AND CARBONACEOUS SEDIMENTS

YAN Caixia, YANG Yi, LIU Min, NIE Minghua, FU Jialu   

  1. (Department of Geography, Key Laboratory of Geographic Information Science of the Ministry of Education, East China Normal University, Shanghai 200062, China
  • Online:2011-06-20

摘要:

疏水性有机污染物(HOCs)是环境中具有较大的辛醇/水分配系数(〖WTBX〗Kow〖WTBZ〗)的一类持久性有机污染物(POPs),吸附解吸过程是环境中HOCs迁移转化的重要途径之一。煤是近年来发现的在土壤及沉积物中非线性吸附特征的重要吸附剂之一,通过阐述原煤及富碳沉积物对HOCs吸附解吸机理,并重点分析影响原煤及富碳沉积物对HOCs吸附解吸过程的因素,包括吸附剂和吸附质本身,pH值、盐度和离子强度等环境因子,试途探究煤对HOCs吸附解吸的本质。由于煤的有机质含量、有机碳组成和空间结构等物理化学性质都明显不同于天然土壤和沉积物,因而对HOCs的吸附解吸过程也具有特殊性(如吸附过程一般为非线性,解吸过程的滞后性)。有关煤对HOCs的吸附解吸机理在微观分子角度的探讨、煤与吸附解吸过程中其他影响因子对反应体系的影响、煤对HOCs降解的环境风险评价等的研究还较少,今后需加强对这些方面的研究

Abstract:

Hydrophobic organic contaminant (HOCs) is one of the persistent organic pollutants (POPs) with high 〖WTBX〗Kow〖WTBZ〗 values in environment.Sorption/desorption plays an important role in HOCs transportation in the aquatic system.Recently,coal was investigated as a significant sorbent in soils/sediments for nonlinear sorption.In the present review,the mechanism of sorption/desorption of coal and carbonaceous sediments was discussed,considering different sorbents and sorbates,pH,salinity and ion strength,etc.Due to the different physiochemical properties,such as TOC content,material compositions and structures,coal and carbonaceous materials exhibit remarkably sorption characteristics,such as nonlinear sorption,hysteresis of sorptiondesorption.Up to now,study on the mechanism of HOCs sorption/desorption of coal and carbonaceous materials in soils/sediments is still scarce,particularly from the aspect of molecule,the function of other factors in the sorption process of coal and the risk assessment on the degradation of HOCs by coal.

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