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《北京大学学报(自然科学版)网络版(预印本)》 2006-01
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Degradation of 2,4-dichlorophenols Catalyzed by Laccase Immobilized on Chitosan

CHEN Hui2) ZHANG Jianbo2),4) WANG Weijing2) YANG Yuxiang3) ZONG Yueru2) (2)Department of Environmental Science, College of Environmental Science , Peking University , Beijing 100871;3)College of Chemistry and Pharmaceutics, East China University of Science and Technology, Shanghai, 200237;  
Research on the removal of 2,4-DCP in aqueous solution by laccase immobilized on chitosan were studied. Factors, such as pH value, temperature and adsorption on support that could influence the oxidation were discussed in detail compared with free laccase. The results indicated that the optimal pH for 2,4-DCP removal by immobilized laccase was around 5.5, lower than the free enzyme for pH 6.0. The optimum temperature of immobilized laccase was between 35℃ and 45℃, wider than the free enzyme. Adsorption of chlorophenol on support had a little effect on the degradation reaction and removal rates of chlorophenols, and the decrease of chlorophenols levels was resulted from catalyzeing for laccase. The continuous oxidation of 2,4-DCP, carried out in the static system of immobilized laccase, showed that the removal efficiency of immobilized laccase still remained over 60% after 6 cycles of operation. Thus the catalytic efficiency of laccase was greated improved.
【Fund】: 国家自然科学基金项目(20577010);; 中意合作UNDP项目(CPR/01/R51/A/CC/31)
【CateGory Index】: X703
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