Promotion of nano-anatase TiO(2) on the spectral responses and photochemical activities of D1/D2/Cyt b559 complex of spinach.
Promotion of nano-anatase TiO(2) on the spectral responses and photochemical activities of D1/D2/Cyt b559 complex of spinach.
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DOI：
10.1016/j.saa.2009.01.010
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发表时间：
2009-06
期刊：
影响因子：
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通讯作者：
Mingyu Su;Huiting Liu;Chao Liu;Chunxiang Qu;Lei Zheng;F. Hong
中科院分区：
文献类型：
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作者：
Mingyu Su;Huiting Liu;Chao Liu;Chunxiang Qu;Lei Zheng;F. Hong
已有研究证实，纳米TiO 2的光催化活性能明显提高菠菜的光合效应，但其促进光能传递和转化的机理尚不清楚。研究了纳米TiO 2对菠菜D1/D2/Cyt b559复合物光谱响应和光化学活性的影响。结果表明：纳米TiO_2的加入使紫外-可见光谱的Soret带和Q带发生蓝移，吸收强度明显增强，共振拉曼光谱出现4个主峰，均为胡萝卜素的特征峰，其拉曼峰强度是对照的6.98倍;（3）荧光发射峰蓝移，强度降低23.59%，（4）DCPIP光还原活性提高129.24%，（5）PS II放氧速率提高51.89%.实验结果表明，纳米TiO 2与D1/D2/Cyt b559复合物结合，促进了复合物的光谱响应，提高了D1/D2/Cyt b559复合物的初级电子分离、电子转移和光能转化。
Previous researches approved that photocatalysis activity of nano-TiO2could obviously increase photosynthetic effects of spinach, but the mechanism of improving light energy transfer and conversion is still unclear. In the present we investigated effects of nano-anatase TiO2on the spectral responses and photochemical activities of D1/D2/Cyt b559 complex of spinach. Several effects of nano-anatase TiO2were observed: (1) UV–vis spectrum was blue shifted in both Soret and Q bands, and the absorption intensity was obviously increased; (2) resonance Raman spectrum showed four main peaks, which are ascribed to carotene, and the Raman peak intensity was as 6.98 times as that of the control; (3) the fluorescence emission peak was blue shifted and the intensity was decreased by 23.59%; (4) the DCPIP photoreduction activity showed 129.24% enhancement; (5) the oxygen-evolving rate of PS II was elevated by 51.89%. Taken together, the studies of the experiments showed that nano-anatase TiO2had bound to D1/D2/Cyt b559 complex, promoted the spectral responses, leading to the improvement of primary electron separation, electron transfer and light energy conversion of D1/D2/Cyt b559 complex.