改性炭对重金属污染土壤修复应用研究进展

Advances in the Application of Modified Biochar to Soil Remediation of Heavy Metal Contamination

近年来,土壤重金属污染问题日益严峻,特别是受重金属污染的农业用地威胁着粮食安全,如何去除或者转化土壤中超标的重金属成为研究的热点问题,改性炭对土壤中重金属的修复受到广大学者的关注,其主要利用生物炭对重金属的吸附、固定和转化作用,降低重金属在土壤中的的流动性和毒害作用。综述了生物炭和改性炭的理化性质、对重金属污染土壤的修复机理以及改性炭对铬、镉、铅、砷、铜5种土壤重金属污染修复的效果,以期为生物炭和改性炭在重金属污染土壤中的修复提供理论依据。

In recent years,the problem of heavy metal pollution in soil is becoming more and more serious,especially the agricultural land contaminated by heavy metals threatens food security,how to remove or transform heavy metals in soil has become a hot topic of research,the repair of heavy metals in soil by modified biochar has been paid attention by scholars,its main use of biochar on heavy metals adsorption,fixation and transformation,reduce the flow and toxic effects of heavy metals in the soil.This paper summarizes the physical and chemical properties of biochar and modified biochar,the repair mechanism of heavy metal contaminated soil and the effect of modified biochar on the restoration of heavy metal pollution in chromium,cadmium,lead,arsenic and copper,with a view to providing theoretical basis for the restoration of biochar and modified biochar in heavy metal contaminated soil.