关键词: 机械化学法, 2, 4-二氯酚, 降解, 球磨

Abstract: The contaminated soil with high content organochlorine was usually difficult to treat after chemical plant being relocated. To solve this problem,the experiment that the contaminated soil with 2,4-dichlorophenol was treated by mechanochemical ball milling process was carried out. Two kinds of ball milling apparatus,horizontal planetary and horizontal planetary, were employed to carry out in this study. Effects of speed,milling time and ball to soil ratio on the degradation of 2,4-dichlorophenol were examined. The results showed that these two kinds of milling apparatus could degrade 2,4-dichlorophenol in soil effectively. When the ball milling speed was 400 r/min,the milling time was 17 h,and the ball to soil ratio was 4∶1,85% of 2,4-dichlorophenol was degraded by horizontal planetary ball milling. With the milling time prolonged over 17 h,the increase degree in degradation of 2,4-dichlorophenol was unremarkable. Under the same conditions,75% of 2,4-dichlorophenol by the horizontal planetary ball milling was degraded. The main degradation mechanism of 2,4-dichlorophenol by ball milling can be explained by the decomposition of 2,4-dichlorophenol under high-speed ball milling,2,4-dichlorophenol being oxidized and carbonized in the atmosphere of O₂ under ball gravimetric extrusion and centrifugal force. It can be evidenced by the color of contaminated soil becoming darker.

Key words: mechanochemical method, 2, 4-dichlorophenol, degradation, ball milling