改性煤矸石/TiO_2复合材料的制备及其光催化性能

Preparation and photocatalytic performance of modified gangue/TiO_2 composite

以盐酸改性煤矸石(hydrochloric acid modification gangue,简称HAG)为载体,采用溶胶-凝胶法制备改性煤矸石负载TiO_2的光催化复合材料TiO_2/wHAG(w:HAG的质量分数,%)。以紫外灯(一类可以产生较大有效范围的紫外光的光源)为光源,以罗丹明B降解为废水降解模型考察复合材料的光催化活性。采用SEM、FT-IR和XRD对TiO_2/wHAG复合材料的表面形貌、光谱特征和晶相结构等进行了表征。结果表明:改性煤矸石与TiO_2之间生成了Ti—O—Si共价键,结合牢固。TiO_2/45HAG与TiO_2相比,其光催化活性和静态吸附性能分别提高了30%和4.1%。另外,改性煤矸石作为载体可减少TiO_2粒子的团聚,并且能保持其原有的表面性质以及晶体结构。

TiO2/HAG（gangue）composite photocatalysts were prepared by the sol-gel method using modified gangue as carrier.Under UV light illumination,photocatalytic activity of TiO2/wHAG（w：the mass fraction of gangue in suspensions%）was investigated by the photocatalytic degradation of Rhodamine B as a model reaction.SEM,FT-IR and XRD were used to characterize the surface properties,spectra characteristics and crystalline structures of the obtained TiO2/wHAG composites.Results indicated that covalent bonds of Ti—O—Si presented between the modified gangue and TiO2.TiO2/45 HAG exhibited higher photocatalytic activity and static adsorption performance by 30%than TiO2.In addition,modified gangue as the carrier could reduce the agglomeration of TiO2 particles,and could keep their surface properties and crystalline structures.