CuxTi（1-x）O2光催化降解硝基苯的性能及最优铜掺杂工艺

为增强TiO2光催化降解硝基苯的性能，采用溶胶-凝胶方法进行TiO2的铜掺杂改性，并通过性能表征与分析确定最优铜掺杂量。XRD、FESEM与Jade分析得出，所制备的1.0%、1.5%、2.0%和2.5% Cu-TiO2在各项指标优于德国P25-TiO2，晶粒尺寸20~50 nm，其中1.5%摩尔比Cu-TiO2的XRD峰值最高和结晶度最好，且团聚现象较弱，且晶粒尺寸小于P25。结合铜掺杂结构、微应力变化以及对硝基苯的降解性能，采用1.5%摩尔比Cu-TiO2光照180 min对硝基苯降解效率最优，是P25-TiO2降解性能的2倍，且遵循拟一级反应动力学。EDS与降解实验联合得出最优降解硝基苯的铜掺杂TiO2式为Cu0.018 3Ti0.981 7O2。模拟含硝基苯废水中C和N元素浓度的变化规律，显示Cu0.018 3Ti0.981 7O2降解硝基苯存在苯环被矿化生成CO2和NO2-键断裂等反应过程。

Performance characterization of photocatalytic degradation of nitrobenzenes by CuxTi(1-x)O2 and optimal Cu doped ratio

Copper doped TiO2 prepared by the sol-gel method was used to enhance the performance of a photocatalytic degradation reaction. The optimum mol ratio of Cu to TiO2 was also analyzed and measured. As determined by XRD, FESEM, and Jade analysis, Cu doped TiO2 with a mol ratio of 1.0%, 1.5%, 2.0%, and 1.0% has better characteristics than German P25 TiO2, with grain sizes of 20—50 nm. In particular, 1.5% Cu doped TiO2 with a fine grain size had the highest and finest degree of crystallinity of TiO2 according to its XRD peak, and the reunion phenomenon was the weakest among all the Cu-TiO2. Combined with the Cu doping structure, micro stress changes, as well as the performance of the degradation of nitrobenzenes (NBs), the optimum mol ratio of Cu doped with TiO2 was 1.5%. With light degradation of NBs using 1.5% Cu-TiO2 for 180 min, the removal efficiency was twice as high as Germany P25 TiO2. The photocatalytic degradation reaction of NBs by Cu-TiO2 followed first order kinetics. Synthetically, FESEM, ESD, and the degradation of NBs performance confirmed that the optimal formula of CuxTi(1-x)O2 for the degradation of NBs is Cu0.018 3Ti0.981 7O2. Based on the varying concentrations of C and N elements in the solution, the intermediate reaction of NB degradation by CuxTi(1-x)O2 included the processes of benzene ring mineralization into CO2 and NO2- bond rupture.