响应面法优化等离子体掺氮改性TiO_(2)纳米管的制备条件

Optimization of preparation factors for plasma nitrogen-doped modified TiO_(2) nanotubes by response surface methodology

采用响应面法对等离子体掺氮TiO_(2)纳米管(N-TiO_(2))的制备条件进行优化,获得具有高光电催化活性的催化剂。以活性艳红K-2BP为目标降解物,分别对掺氮功率、掺氮时间及外加偏压进行单因素实验,并采用Design-Expert8.0软件设计响应面实验,构建响应面模型,然后对结果进行ANOVO、等高线与三维曲线分析。结果表明,掺氮功率为10 W,掺氮时间为90 s,外加偏压为20 V时,N-TiO_(2)纳米管光电催化活性最佳;经验证,该条件下的响应目标模型的预测值与实验值的误差率仅为0.79%,N-TiO_(2)纳米管带隙明显减小。

The method was utilized to optimize the nitrogen-doped conditions of plasma nitrogen-response surface doped TiO_(2) nanotubes(N-TiO_(2))to fabricate catalysts with high photoelectrocatalytic activity,which was measured by the photoelectrocatalytic decolorization of reactive brilliant red K-2BP.The effects of nitrogen-doped power,time and bias voltage were studied in single factor experiments.Based on the results,a response surface model including three factors was established in Design-Expert 8.0,which could perform ANOVO,contour and 3D curve analysis.The results show that the photocatalytic activity of N-TiO_(2) nanotubes was the best when the nitrogen-doped power,time and bias voltage were 10 W,90 s,20 V.It was proved that the error rate between the modeled and observed values of the response target model was only 0.79%,the band gap of N-TiO_(2) nanotubes was significantly reduced.