【摘要】 以Ti（OC₄H₉）₄为原料,溶胶-凝胶法制备纳米TiO₂薄膜,用原子力显微镜（AFM）观察了纳米TiO₂薄膜的形貌,X-射线衍射（XRD）考察相同条件下粉体的相结构.研究水中橡椀栲胶的光催化降解行为.结果表明,橡椀栲胶的降解可用Langmuir-Hinshelwood方程来描述,即浓度较高时,栲胶降解液的光催化降解符合零级动力学方程;浓度较低时,栲胶降解液的光催化降解符合一级动力学方程.外加H2O2对橡椀栲胶的光催化降解有极大的促进作用,但这种促进作用会因为光生电子效率的影响而有一个极限值.在远离橡椀栲胶溶液等电点的起始pH值条件下光催化降解效果较好,且在碱性条件下的降解速率高于酸性条件下的降解速率.更多还原

【Abstract】 Nanoparticle TiO₂ film photocatalysts was prepared by sol-gel method using Ti（OC₄H₉）₄ as the precursor Surface morphologies of the photocatalyst were characterized by AFM, XRD patterns were obtained using a powder diffractometer, and the photocatalytic degradation of volanea tannin extract in water was studied in the reactor with UV lamp as light source The results showed that the kinetic of photocatalytic degradation rate of volanea tannin extract can be described by Langmuir-Hinshelwood equation, which is photocatalytic degradation of volanea tannin extract degradation solution conforms to zero order dynamics equation at high concentration; and conforms to first order dynamics equation at low concentration External addition of H₂O₂ shows a high acceleration for the photocatalytic degradation of volanea tannin extract, but it is limited as a result of the amount of light-induced electron Effects of nano-TiO₂ thin film photocatalytic oxidatic degrade volanea tannin extract are better at initial pH far from isoelectric point of volanea tannin extract; and degradation speed is more rapid under alkaline condition than acidity condition更多还原