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为了利用TiO_2优越的光催化活性和蒙脱土(MMT)的结构特性,首先,以MMT为载体、TiCl_4为原料、氨水为沉淀剂,采用水解沉淀法制备了TiO_2/MMT复合材料;然后,利用FTIR、XRD和SEM对TiO_2/MMT复合材料进行成分、晶型、结构和形貌表征;最后,在紫外光照射下,考察了不同TiO_2含量的TiO_2/MMT复合材料对模拟苯酚废水的光催化降解活性,并结合紫外-可见光谱对复合材料光催化降解苯酚的过程进行了跟踪实验。结果表明:所制备的TiO_2/MMT复合材料中TiO_2为锐钛矿相,在MMT上的晶粒尺寸为7.8nm。TiO_2/MMT复合材料中层间域内成分被钛柱取代,且柱撑反应在层间域内进行。因此MMT的基本骨架不变,且TiO_2分散在MMT的表面。当苯酚的初始浓度为10mg/L、苯酚溶液的pH为6且紫外光照射时间为150min时,37.5wt%TiO_2/MMT复合材料对苯酚降解率为63%,优于MMT(4.5%)和纯TiO_2(55%),说明MMT的负载提高了TiO_2的光催化活性。
In order to take advantage of the excellent photocatalytic activity of TiO 2 and the structural characteristics of MMT, firstly, MMT as support, TiCl 4 as raw material and ammonia as precipitator, TiO 2 / MMT composites were prepared by hydrolytic precipitation method. Then, FTIR, XRD and SEM were used to characterize the composition, crystal structure, morphology and morphology of TiO 2 / MMT composites. Finally, the photocatalytic degradation of simulated phenol wastewater with TiO 2 / MMT composites with different TiO 2 content was investigated under UV irradiation The photocatalytic degradation of phenol by UV-Vis spectroscopy was carried out. The results show that the TiO 2 / MMT composites prepared anatase phase, the grain size of MMT 7.8nm. The interlaminar domains in the TiO 2 / MMT composites were replaced by titanium columns, and the pillaring reaction was carried out in the interlayer space. Therefore, the basic framework of MMT remains unchanged, and TiO 2 is dispersed on the surface of MMT. When the initial concentration of phenol was 10 mg / L, the pH of phenol solution was 6 and the UV irradiation time was 150 min, the phenol degradation rate of 37.5wt% TiO_2 / MMT composite was 63%, which was better than that of MMT (4.5%) and pure TiO 2 (55%), indicating that the loading of MMT increased the photocatalytic activity of TiO 2.