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30minMC-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.
Abstract:
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 photocatalytic 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 photocatalytic degradation of MC-LR.The light intensity was also an important factor in MC-LR photocatalytic degradation,as a higher light intensity resulted in a higher removal ratio and removal rate of MC-LR.
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