TiO2/底泥复合材料的制备及其可见光催化性能评价

《复合材料学报》优先在线发表论文。

摘  要：以河道底泥为载体，钛酸四异丙酯（TTIP）为前驱体，通过溶胶凝胶法制备了TiO2/底泥复合可见光催化剂，考察了催化剂在可见光下的催化活性、可回收利用性和稳定性。利用XRD、SEM、XPS和BET对TiO2/底泥复合材料进行晶型、形貌、表面形态、孔结构等表征。通过表征分析发现：相比TiO2，TiO2/底泥复合材料具有更丰富的多孔结构，其比表面积可增加至98.43m2/g。对模拟含甲基橙印染废水的可见光催化降解实验说明，当底泥和TiO2质量比为0.5﹕1时，所制备的TiO2/底泥复合催化剂在可见光照射下表现出较高的催化活性，反应4 h后甲基橙的降解率达到48.8%，且回收循环使用6次后对甲基橙的降解率仍能保持在45%以上，表现出较强的稳定性。

关键词：河道底泥；TiO2；复合材料；光催化剂；甲基橙

Abstract: The river sediment (RS) and TiO2 was used as the raw materials to synthesize the visible-light catalyst by sol-gel method, in which the sediment served as carrier and tetraisopropyl titanate (TTIP) functioned as precursors. The catalytic activity, recyclability and stability of the catalyst under visible light were investigated in depth. The crystal form, morphology, surface morphology and pore structure of TiO2/sediment composites were characterized by XRD, SEM, XPS and BET. By catalyst characterization, it is found that the porous structure of the TiO2/sediment composite was more obvious than the pure TiO2, and its specific surface area can be increased to 98.43 m2/g. The catalytic ability of TiO2/sediment composite which the mass ratio of river sediment to TiO2 of 0.5:1 is tested in the visible light assisted degradation systems by using methyl orange as the model pollutant. The results show the degradation efficiency of methyl orange can reach 48.8% after 4 h and the dye removal can remain 45% after 6 cycles of catalyst recycling.

Keywords: river sediment; TiO2; composite; photocatalyst; methyl orange

作者：谷麟等，上海理工大学 环境与建筑学院，上海

通讯作者：闻海峰，上海理工大学 环境与建筑学院，上海

全文详见中国知网学术期刊优先数字出版。