Liu Lu, Liu Huajie, Zhao Ya-Ping, Wang Yuqiu, Duan Yueqin, Gao Guandao, Ge Ming, Chen Wei
Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071, China.
Environ Sci Technol. 2008 Apr 1;42(7):2342-8. doi: 10.1021/es070980o.
Nanostructured TiO2 with different hierarchical morphologies were synthesized via a warmly hydrothermal route. The properties of the products were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, N2 adsorption, UV-vis spectroscopy, etc. Two of the products, TiO2 1D nanorods (one-dimensional rutile TiO2 nanorods) and TiO2 3D0D microspheres (three-dimensional anatase TiO2 nanoparticle-assembled microspheres) exhibited superior photocatalytic effects on phenol degradation under UV illumination, compared with TiO2 3D1D microspheres (three-dimensional rutile TiO2 nanorods-assembled microspheres). Moreover, TiO2 3D0D was superior to TiO2 1D, as indicated by a 30% higher mineralization of dissolved phenol. Dihydroxybenze, 4,4'-dihydroxybiphenyl, benzoquinone, maleic anhydride, etc. were identified as the degradation intermediates. The excellent catalytic effect was attributed to the structural features of TiO2 1D nanorods and TiO2 3D0D microspheres, that is, a larger amount of surface active sites and a higher band gap energy resulted in more efficient decomposition of organic contaminants.
通过温和水热法合成了具有不同分级形貌的纳米结构二氧化钛。通过扫描电子显微镜、透射电子显微镜、X射线衍射、N2吸附、紫外可见光谱等对产物的性能进行了表征。与TiO2 3D1D微球（三维金红石TiO2纳米棒组装微球）相比，其中两种产物TiO2 1D纳米棒（一维金红石TiO2纳米棒）和TiO2 3D0D微球（三维锐钛矿TiO2纳米颗粒组装微球）在紫外光照射下对苯酚降解表现出优异的光催化效果。此外，TiO2 3D0D优于TiO2 1D，溶解苯酚的矿化率高30%表明了这一点。二羟基苯、4,4'-二羟基联苯、苯醌、马来酸酐等被鉴定为降解中间体。优异的催化效果归因于TiO2 1D纳米棒和TiO2 3D0D微球的结构特征，即大量的表面活性位点和更高的带隙能量导致有机污染物的更有效分解。
