Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering G. Natta, Via Mancinelli 7, 20131 Milan, Italy.
J Hazard Mater. 2011 Feb 28;186(2-3):2103-9. doi: 10.1016/j.jhazmat.2010.12.128. Epub 2011 Jan 6.
Titanium anodizing can be a powerful technique to generate photoactive oxides, strongly adherent to the metallic substrate, and to modify their chemical composition by inducing doping effects. This work investigates the photocatalytic behavior of differently obtained anodic TiO(2) films under UV and visible light irradiation, so as to define the best treatment for wastewaters purifiers. Anodizing was performed in H(3)PO(4) and H(2)SO(4) mixtures or in fluoride containing electrolytes. Morphology, elemental composition and crystal structure of the anodic films were characterized by XDR, GDOES and SEM. When amorphous oxides were obtained, an annealing treatment was used to promote the formation of anatase crystals. Annealing was also performed in nitrogen atmosphere to induce nitrogen doping. The photocatalytic efficiency of anatase-enriched TiO(2) was investigated in rhodamine B photodegradation. Doping was induced not only by annealing but also directly by anodizing, and generated photoactivity in both the UV and Vis components of light.
钛阳极氧化是一种强大的技术，可以生成与金属基底强附着的光活性氧化物，并通过诱导掺杂效应来改变其化学成分。本工作研究了在紫外光和可见光照射下，通过不同方法获得的阳极 TiO(2) 薄膜的光催化行为，以确定废水净化器的最佳处理方法。阳极氧化是在 H(3)PO(4)和 H(2)SO(4)混合物或含氟电解质中进行的。XDR、GDOES 和 SEM 用于表征阳极膜的形貌、元素组成和晶体结构。当获得非晶态氧化物时，采用退火处理来促进锐钛矿晶体的形成。退火也在氮气气氛中进行，以诱导氮掺杂。通过罗丹明 B 的光降解来研究富锐钛矿 TiO(2) 的光催化效率。掺杂不仅通过退火诱导，而且通过阳极氧化直接诱导，在光的紫外和可见成分中都产生了光活性。
