安徽大学本科生学士论文
图3. K3PW12O40/TiO2的SEM谱图
3.2 光降解实验的紫外-可见吸收光谱分析
为了研究K3PW12O40/TiO2对罗丹明6G的脱色降解作用，用紫外可见分光光度计来检测罗丹明6G特征吸收峰强度随时间变化的规律，罗丹明6G的特征吸收峰在526nm处，图4是K3PW12O40/TiO2作用下随紫外照射而脱色降解过程的紫外-可见光谱图。紫外光可以使罗丹明6G结构降解，但这是一个漫长的过程。在同时伴有K3PW12O40/TiO2条件下，它的降解过程就大大的加快了，图2中的曲线从上而下是时间间隔为5min，当反应进行30min后，罗丹明6G特征吸收峰强度已经消失了，在紫外光照射下， K3PW12O40/TiO2的催化是明显。图5是罗丹明6G吸收强度随时间变化的规律图。
2Absorbance0min5min10min15min20min25min30min10450500550600Wavelength(nm)
图4. K3PW12O40/TiO2光降解罗丹明6G的UV-Vis光谱图
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安徽大学本科生学士论文
1.41.21.0Absorbance0.80.60.40.20.005101520253035time(min)
图5. 罗丹明6G吸收强度随时间变化图
结 论
采用溶胶-凝胶法制备了K3PW12O40/TiO2光催化剂,经分析测试表明，二氧化钛为锐钛矿型,磷钨酸仍保持其Keggin结构的基本骨架,二氧化钛与磷钨酸钾二者之间存在着较强的相互作用。作为复合型光催化剂, 具有较好的光催化活性, 比单纯的TiO2具有更高的光催化活性, 对有色废水的降解取得了较满意的效果。在太阳光条件下降解工业污染物, 具有操作简便, 且K3PW12O40/TiO2复合光催化剂可重复利用，具有适用范围广泛等优点,有较好的潜在应用前景。
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安徽大学本科生学士论文
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安徽大学本科生学士论文
致 谢
本论文是在导师谢安建教授和沈玉华教授的指导和关怀下完成的。导师对于论文选题给予了最大的理解和支持，对于我的生活也给予了很多帮助。他们扎实的理论功底、渊博的学识、精益求精的科学态度、敏捷的思维、勇于实践的精神给我留下了深刻的印象，使我受益匪浅，永远值得我学习。我愿借此机会向我的导师谢安建教授表示我最衷心的感谢。 特别感谢齐春霞师姐在实验上给予我的帮助，在论文的写作上指出我的不足，并提供宝贵的意见。
感谢实验室的孔祥泰等老师，刘三先，马静等师兄师姐们在实验过程中给予的关怀和照顾。
当然，想要感谢的人还有很多很多，恕我未能一一提及。再次向关心、支持和帮助过本论文工作的所有人致谢！
徐喆
2008年5月于安徽大学
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