磺化β-环糊精光催化降解有机磷农药久效磷的应用研究

Study of Photocatalytic Degradation of Pesticide by Sulfonated β-cyclodextrin

环糊精应用于环境科学方面，能够对有机污染物产生降解作用。久效磷作为有机磷农药被广泛使用。本实验采用经磺化改性的β-环糊精，采用自行设计光催化降解装置，在分光光度法的基础上，提出了一种实验室用光催化降解有机磷农药的实验方法。分析了光照、反应时间、浓度等因素对光催化降解的影响。实验结果表明，分别加入20g，L和40g/L的磺化β-环糊精能够增加久效磷2．08～2．86倍的光降解率。另外，40班的磺化β-环糊精可增加1．8～2．2倍的光降解率。光敏效应主要是由于磺化β-环糊精与久效磷形成包和物引起的。本方法简单易行．成本低廉，可用于实验室光催化降解确机磷农药的研究。所以．环糊精在环境保护方面有较好的应用前景。

Application of cyclodextrins in enviroment science upon aspects; enrichment and removal of organic pollutants and heavy metals from soil, water, and atmosphere. β-cyclodextrin （β-CD） can be linked when it was sulfonation-modified. A convenient method of photocatalytic degradation of pesticide in lab by self-designed photscatalytic plant was proposed based on analysis and comparison of different methods used to detect pesticide. The effects of illumination, reaction time, and pesticide concentration were analyzed. So cyclodextrin play an important role in environmental protection. The results showed that the photodegradation of monocrotophes increased 2.08-2.86 times in the presence of 20 g/L and 40 g/t, sulfonated β-cyclodextrin.ln addition,the photodegradation of omethoate increased 1.8-2.2 times in the presence of 40 g/L sulfonated β-eyclodextrin. The light activation was caused by the formaton of inclusion complexes of monocrotophes and omethoate with sulfonated β-cyclodextrin. It is found that the method is simple and has lower costs; and it can be used in lab for the photscatalytic degradation of pesticide.