中文摘要：

研究了蓝藻中含量最多的色素——叶绿素在微囊藻毒素-LR（MC—LR）光催化降解中的作用，考察了波长和光强等对叶绿素催化的MC-LR光降解的影响．结果表明，叶绿素能导致MC-LR在日光照射下光降解，而且MC—LR的降解与其浓度呈正相关．在叶绿素浓度为0．1mg·ml^-1的条件下，日光照射30rainMC-LR的去除率即可达到95％以上，而叶绿素浓度为0．05mg·ml^-1和0．01mg·ml^-1时，照射30min后MC—LR的去除率分别为65％和56％．日光中紫外区（200-300nm）的光，在光催化降解MC—LR中起主要作用，与体系最大吸收光谱范围一致的240nm的光激发效果最好，光催化降解作用也最强．光照强度是影响MC—LR降解的重要因素，光强越大，MC—LR的降解率和降解速度越大．

英文摘要：

The effect of chlorophyll, the most commonly pigment in cyanobacteria, on photocatalytic degradation of microcystin-LR（MC-LR） was studied. The influence of wavelength and intensity of light on MC-LR photocatalytic degradation was also investigated. The results showed that chlorophyll was a key factor on pbotocatalytic degradation of MC-LR, and the MC-LR degradation level was positively correlated with the concentration of chlorophyll. With the occurrence of 0. 1 mg · ml^-1 chlorophyll, over 95% of MC-LR was degraded after 30 minutes＇sunlight irradiation, while with the aid of 0. 05 mg·ml^-1 and 0.01 mg· ml^-1 chlorophyll, only 65% and 56% of MC-LR was removed. The ultraviolet region （200--300 nm） of the sunlight played a dominant role in photocatalytic degradation of MC-LR, and 240 nm was the optimal for optical excitation and photocata- lytic degradation of MC-LR. The light intensity was also an important factor in MC-LR photocatalytic degrada- tion, as a higher light intensity resulted in a higher removal ratio and removal rate of MC-LR.