The Effect of Photocatalyst on Algae in Nutrition Water Abstract: The BiOI/TiO2 composite photocatalysts were prepared by precipitation deposition method. The morphology, structure of the photocatalysts were charactered using a number of analytical instumentations including X-ray powder diffraction (XRD) and scanning electron microscopy (SEM).The photocatalytic reaction was performed under the visible light irradiation. The photocatalytic activity of BiOI/TiO2 and TiO2 was investigated by the change of the chlorophyll content, protein content, as well as DNA hyperchromic effect of different algae before and after photocatalytic reaction. The results showed that photocatalysts result in decreases of the chlorophyll content and protein content of algae, and make DNA hyperchromic effect of algae more obvious. Compared with TiO2, the as-preparaed BiOI/TiO2 composite photocatalysts indicats higher photocatalytic activity than TiO2. Key words: Precipitation-deposition method; Different algae; Photocatalysts; Killing effect;BiOI/TiO2
目录
摘 要 1
引 言 1
1 材料与方法 2
1.1主要实验材料 2
1.2 光催化剂的制备 3
1.3 光催化剂结构和性能表征分析 3
1.3.1 XRD分析 3
1.3.2 SEM分析 3
1.4 光催化剂对藻类影响的实验方法 3
1.4.1藻类的采集与培养 3
1.4.2光催化剂对藻类生长影响的实验设计 4
1.4.3藻类生理指标的测定方法 4
2 结果与分析 4
2.1光催化剂的结构表征 4
2.1.1 X射线衍射(XRD)分析 4
2.1.2 电镜(SEM)分析 5
2.2 实验结果分析 6
2.2.1 光催化剂对不同藻类叶绿素a含量的影响 6
2.2.2 光催化剂对不同藻类蛋白质含量的影响 7
2.2.3 光催化剂对不同藻类DNA的影响 9
3 讨论与展望 9
参考文献 11
致谢 13,3642 引言
藻类在水体中的大量繁殖导致水环境恶化,水华赤潮的频繁出现破坏了水体生态环境的平衡,目前,治理富营养化水体已经成为一项世界范围的难题[1-2]。国际上对抑藻方法展开了大量研究,但是,到目前为止,大多还处于实验研究阶段,其实际应用方面仍然存在诸多问题,如物理方法虽效果明显,但是费用高,且耗时费力;化学方法虽然见效较快,但其成本高、毒副作用和二次污染的问题仍有待研究[3-5]。
半导体光催化技术是一项具有广阔应用前景的水处理技术,因其氧化能力强、催化活性高、无毒、稳定性好等特点,被广泛应用于污水处理、空气净化和消毒灭菌等领域,具有良好的应用前景。TiO