胶原纤维为模板介孔TiO_2和Pt掺杂TiO_2纤维的制备及光催化降解黑液(英文)

Preparation of Mesoporous TiO_2 and Pt-Doped TiO_2 Fibers with Collagen Fiber as a Template and Their Performance for Photocatalytic Degradation of Black Liquor

以胶原纤维为模板,Ti(SO4)2为钛源,合成了新型光催化剂—介孔TiO2和Pt掺杂TiO2纤维。通过场发射扫描电镜(FESEM)、比表面积和孔径分析、紫外–可见光谱和分子荧光光谱等检测手段对两种介孔TiO2纤维的结构和物理性能进行了表征。FESEM分析表明,胶原纤维的表面结构能被较好地保留在介孔TiO2和Pt掺杂TiO2纤维中。N2吸附–脱附等温线为IV型,表明TiO2和Pt掺杂TiO2纤维具有介孔结构。基于结构的特点,在可见光和UV-A激发下,介孔TiO2和Pt掺杂TiO2纤维表现出强于商品级纳米TiO2(Degussa P25)的总有机碳(TOC)脱除率。此外,Pt的掺杂能明显改善介孔TiO2的光催化活性。光催化实验表明,Pt掺杂TiO2纤维(1.0g L–1)在可见光照射420 min后,黑液的TOC脱除率为37%;UV-A(360 nm)照射300min后,TOC脱除率为51%。因此,制备的介孔TiO2和Pt掺杂TiO2纤维作为一类性能优异的光催化剂,能用于黑液的光催化降解,并在其他类似的反应条件下具有潜在的应用前景。

The mesoporous TiO2 and Pt-doped TiO2 fibers as a catalyst were prepared with collagen fiber as a template and Ti（SO4）2 as a titanium source.Their structure and physical properties were characterized by field emission scanning electron microscopy（FESEM）,specific surface area analysis,UV–Vis absorption spectra and photoluminescence spectra（PL） as well.The FESEM analysis indicated that the well-defined surface morphology of natural collagen fiber was mostly preserved in TiO2 and Pt-doped TiO2 fibers.The N2 adsorption/desorption isotherms of TiO2 and Pt-doped TiO2 fibers were typical type IV due to the characteristics of mesoporous materials.The mesoporous TiO2 and Pt-doped TiO2 fibers revealed a higher total organic carbon（TOC） removal rate of black liquor under visible light and UV-A light irradiation,compared to commercial nano-TiO2（Degussa P25）.In addition,the photocatalytic activity of mesoporous TiO2fiber could be improved by doping Pt.When the mesoporous Pt-doped TiO2 fiber of 1.0 g/L was used,the TOC of black liquor was removed by 37% for 420 min under visible light irradiation,and by 51% for 300 min under UV-A（360 nm） irradiation.Therefore,the prepared mesoporous TiO2 and Pt-doped TiO2 fibers could act as an efficient catalyst for the photocatalytic degradation of black liquor,and also suggested the promising applications.