电化学-表面铜螯合磁性二氧化硅固定化漆酶联合催化降解水中五氯酚

THE CATALYTIC DEGRADATION OF PENTACHLOROPHENOL( PCP) BY THE COMBINED PROCESS OF ELECTROCHEMICAL OXIDATION AND IMMOBILIZATION OF LACCASE ON Cu( Ⅱ) CHELATING MAGNETIC SILICA

利用电化学-固定化漆酶联合工艺催化降解水中五氯酚。结果表明:反应0.5 h时,五氯酚的降解效率达82%,虽然与单独固定化漆酶催化降解五氯酚效能没有明显区别,但联合工艺中酶活损失较小,反应5 h,联合工艺的相对剩余酶活为32.6%,比单独使用固定化漆酶提高12%,且联合工艺脱氯能力明显提高。催化反应重复进行5次后,联合工艺的五氯酚去除率和相对剩余酶活分别为52.3%和33.6%,分别比单独使用固定化漆酶催化降解提高38.5%和13.7%。

The catalytic degradation of pentachlorophenol( PCP) in aqueous solution by the combined process of electrochemical oxidation and immobilization of laccase on Cu( Ⅱ) chelating magnetic silica was investigated. The removal efficiency of PCP achieved 82% at the initial 0. 5 h. Compared with the immobilized laccase,the combined process showed higher residual activity of immobilized laccase although there was no significant difference in the removal efficiency of PCP between the two processes. After 5 h,the residual activity of immobilized laccase in the combined process was 32. 6%,which was 12% larger than that in the immobilized laccase process. The capacity of dechloridation obviously improved in the combined process. The degradation of PCP was repeated five times; the removal efficiency of PCP and the residual activity of immobilized laccase in the combined process was 52. 3% and 33. 6% respectively,which were 38. 5% and 13. 7% higher than that in the immobilized laccase process.