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以TiCl_3为TiO_2钛源,二聚氰胺为g-C_3N_4前驱体,制备了g-C_3N_4/TiO_2复合材料;通过透射电子显微镜(TEM)、X射线衍射(XRD)和紫外可见光吸收光谱(UV-vis)等对g-C_3N_4/TiO_2复合材料进行形貌、元素和催化活性的表征.结果表明,TiO_2能很好地依附在g-C_3N_4的表面;吸收光发生了红移,扩大了TiO_2的吸收光谱范围;催化剂活性实验研究表明g-C_3N_4与TiO_2按1:9的质量掺杂比例制备出的g-C_3N_4-10/TiO_2复合材料对布洛芬(IBU)的光催化降解效果最好;实验同时研究了g-C_3N_4-10/TiO_2复合材料对IBU光催化降解的影响机制.IBU的光催化反应符合准一级动力学规律;酸性环境下有利于IBU的降解;使用异丙醇作为·OH分子探针,检测到·OH存在于g-C_3N_4/TiO_2光催化体系中,并计算得出·OH的贡献率为73.7%,表明·OH在降解中起到主要作用.
G-C_3N_4 / TiO_2 composites were prepared by using TiCl_3 as the TiO_2 source and melamine as the precursor of g-C_3N_4. The properties of the composites were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and UV- vis) were used to characterize the morphology, elemental and catalytic activity of the composites. The results show that TiO 2 can be well attached to the surface of g-C 3 N 4, and the absorbed light red shifts to enlarge the absorption of TiO 2 The experimental results show that g-C_3N_4-10 / TiO_2 composites prepared from g-C_3N_4 and TiO_2 at a mass ratio of 1: 9 have the best photocatalytic activity for the degradation of ibuprofen. The experiment The mechanism of photocatalytic degradation of IBU by g-C_3N_4-10 / TiO_2 composites was also studied. The photocatalytic reaction of IBU accords with the quasi-first-order kinetics, the degradation of IBU is favored under acidic conditions, and isopropanol is used as · OH Molecular probes were used to detect the presence of · OH in the g-C 3 N 4 / TiO 2 photocatalytic system. The calculated contribution of · OH was 73.7%, indicating that · OH played a major role in the degradation.