MW/MnO_2对2,4-二氯酚污染土壤的修复研究

Repairing study of microwave radiation/manganese dioxide on 2, 4-dichlorophenol contaminated soil

以MnO2作为微波吸收剂,研究微波辐射技术在密封体系中对2,4-二氯酚污染土壤的修复效果。在有MnO2存在的条件下,H2SO4(20%)介质下的2,4-二氯酚处理效果最好,10min的微波辐射可使50mg.kg-1的2,4-二氯酚污染土壤得到较好的修复,但随H2SO4浓度的降低或增高,2,4-二氯酚的去除率有所降低。在没有MnO2存在的条件下,纯水和不同浓度H2SO4介质辅助微波对2,4-二氯酚有较好的去除,但是在10mol.L-1NaOH介质下,2,4-二氯酚基本上没有去除。

The repairing effect of on 2,4-dichlorophenol contam inated soil in the closed system was studied by using microwave radiation technology and MnO2 as the microwave absorption.When MnO2 was added to the soil,in the circumstances of a 20% simulated moisture content,the treatment effect of 2,4-dichlorophenol was the best in the sulfuric acid（20%）medium,and the 50mg·kg^-1 soil of 2,4-dichlorophenol gained a better repairing in 10min of microwave radiation.However,the removal rate of 2,4-dichlorophenol decreased with lower or higher concentration of sulfuric acid.Without MnO2,2,4-dichlorophenol can achieved a better removal in water or different concentration acid medium,but 2,4-dichlorophenol could hardly be removed in 10 mol·L^-1 sodium hydroxide.