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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。
The hydrochloric acid modified gangue (HAG) was used as a carrier to prepare TiO 2 / wHAG (w: HAG mass fraction,%) of modified coal gangue supported TiO_2 by sol-gel method. The UV light (a kind of light source which can produce a large effective range of UV light) was used as the light source, and the photocatalytic activity of the composite was investigated with degradation of Rhodamine B as a wastewater degradation model. The surface morphology, spectral characteristics and crystal structure of TiO 2 / wHAG composites were characterized by SEM, FT-IR and XRD. The results show that the covalent bonds of Ti-O-Si are formed between modified coal gangue and TiO 2, and the bond is firm. The photocatalytic activity and static adsorption capacity of TiO_2 / 45HAG increased by 30% and 4.1% respectively compared with that of TiO_2. In addition, the modified coal gangue as a carrier can reduce the agglomeration of TiO 2 particles, and can maintain its original surface properties and crystal structure.