摘要
纳米TiO2因其具有安全无毒、稳定性好、光活性强等特性,在水污染治理领域被广泛用作光催化剂。然而纳米TiO2在水介质中存在难以回收、容易流失、不易分散等问题,限制了其实际应用,将其进行固定化负载是有效的解决手段。以矿物海泡石为负载载体,采用一种简单易行的粉末烧结法制备出纳米TiO2/海泡石复合光催化材料,并通过透射电镜、扫描电镜、X射线衍射、紫外-可见分光光度计等手段对材料进行微结构表征,利用化学荧光技术测试了复合材料光催化活性。研究表明,海泡石的加入能够显著抑制复合光催化剂中纳米TiO2的团聚,增强其在紫外至可见光波长范围内的光吸收强度,从而增强复合体的光催化活性。对比研究不同负载配比对材料光催化活性的影响,发现90%TiO2/海泡石光催化活性最佳。
Nano-TiO2 is widely used as photocatalyst in the elimination of water pollutants due to its non-toxicity,high photocatalytic activity and chemical stability.However,its engineering application is restricted by the disadvantages of difficult separation and recycling from water.In order to overcome these problems,we design an effective method that immobilizes TiO2 on support matrix.Nano-TiO2/sepiolite photocatalytic composites are synthesized by an easily-access powder sintering process,in which sepiolite is used as the support matrix.And the microstructure,morphologies and photocatalytic property of nano-TiO2/sepiolite composites are characterized and analyzed by scanning and transmission electron microscopy,X-ray photoelectron spectroscopy,UV-visible spectroscopy and Fluorescence spectroscopy.The results show that sepiolite support matrix reduces agglomeration of nano-TiO2 and enhances the absorption ability within the UV-Vis range increasing the photocatalytic activity of the composites consequently.Meanwhile,the influence of different load ratio of the composites on photocatalytic performance is explored,indicating that 90% TiO2/sepiolite has the optimal photocatalytic activity.
出处
《人民长江》
北大核心
2012年第24期55-59,共5页
Yangtze River
基金
中央级公益性科研院所基本科研业务费专项资金项目(CKSF2011015/CL+SH
CKSF2012033/CL)
科技部国际科技合作项目(2010DFB70470)
