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

Hydrophobic organic contaminant(HOCs) is one of the persistent organic pollutants(POPs) with high Kow 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.