Department of Chemical Engineering, Indian Institute Of Science, Bangalore, 560012, Karnataka, India.
J Hazard Mater. 2010 Apr 15;176(1-3):765-73. doi: 10.1016/j.jhazmat.2009.11.101. Epub 2009 Nov 24.
The photocatalytic degradation of five anionic, eight cationic and three solvent dyes using combustion-synthesized nano-TiO(2) (CS TiO(2)) and commercial Degussa P-25 TiO(2) (DP-25) were evaluated to determine the effect of the functional group in the dye. The degradation of the dyes was quantified using the initial rate of decolorization and mineralization. The decolorization of the anionic dyes with CS TiO(2) followed the order: indigo carmine > eosin Y > amido black 10B > alizarin cyanine green > orange G. The decolorization of the cationic dyes with DP-25 followed the order: malachite green > pyronin Y > rhodamine 6G > azure B > nile blue sulfate > auramine O approximately = acriflavine approximately = safranin O. CS TiO(2) showed higher rates of decolorization and mineralization for all the anionic dyes compared to DP-25, while DP-25 was better in terms of decolorization for most of the cationic dyes. The solvent dyes exhibited adsorption dependent decolorization. The order of decolorization and mineralization of the anionic and cationic dyes (a) with CS TiO(2) and DP-25 was different and correlated with the surface properties of these catalysts (b) were rationalized with the molecular structure of the dye and the degradation pathway of the dye.
采用燃烧合成纳米 TiO2（CS TiO2）和商用 Degussa P-25 TiO2（DP-25）对 5 种阴离子染料、8 种阳离子染料和 3 种溶剂染料进行光催化降解，以确定染料官能团的影响。采用初始脱色率和矿化率定量评估染料的降解情况。CS TiO2 对阴离子染料的脱色顺序为：靛蓝胭脂红>曙红 Y>酰胺黑 10B>茜素氰绿>橙 G。DP-25 对阳离子染料的脱色顺序为：孔雀石绿>派洛宁 Y>罗丹明 6G>阿扎比>尼罗蓝硫酸盐>吖啶橙≈金胺 O≈吖啶黄素≈沙黄 O。与 DP-25 相比，CS TiO2 对所有阴离子染料的脱色和矿化速率均较高，而 DP-25 对大多数阳离子染料的脱色效果较好。溶剂染料的脱色为吸附依赖性。CS TiO2 和 DP-25 对阴离子和阳离子染料（a）的脱色和矿化顺序不同，与这些催化剂的表面性质（b）有关，可通过染料的分子结构和染料的降解途径来解释。
