Enhanced photo-catalytic activity of the composite of TiO2 and conjugated derivative of polyvinyl alcohol immobilized on cordierite under visible light irradiation

• 来源期刊: 能源化学
• 年，卷（期）: 2016,（1）
• 页码范围: 55-61
• 页数: 7页
• 语种: 英文

摘要

A novel visible light active photo-catalyst named CHC/C-PVA/TiO2,the composite of titanium dioxide (TiO2) with conjugated derivative of polyvinyl alcohol (C-PVA) loaded on a cordierite honeycomb ceramic (CHC) substrate,was fabricated by combining the synthesis of TiO2 sol,preparation of C-PVA via thermally treating polyvinyl alcohol,and immobilization of TiO2 sol and C-PVA on CHC.By detecting the change of UV-vis absorption spectra of the model organic pollutant (methyl orange (MO)) in the presence of the composite under visible light irradiation,the photo-catalytic activity was evaluated and the results show that the CHC/C-PVA/TiO2composite has an enhanced photo-catalytic activity when compared to the CHC/TiO2 composite.Besides,the CHC/C-PVA/TiO2 shows a good photo-catalytic stability after the fourth cycles.The structure analyses by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) show the coexistence of C-PVA and TiO2 on the CHC and the cracks on the surface of CHC/C-PVA/TiO2.Result of ultraviolet-visible diffuse reflection spectroscopy (UV-vis DRS) reveals that the CHC/C-PVA/TiO2 can absorb both ultraviolet and visible light while result of X-ray photoelectron spectroscopy (XPS) indicates the existence of C,O and Ti elements in the CHC/C-PVA/TiO2.The typical structures as well as the optical characteristics of the CHC/C-PVA/TiO2 are responsible for the enhancement in the photo-catalytic activity.