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采用水热合成法,通过改变反应条件,控制反应参数,成功地合成了粒径可控的球形TiO2纳米粒子和长径比、比表面积均比较大的纳米管.用XRD,TEM,SAED和BET等手段对产物进行了表征.为了测试产物的光催化性能,以高浓度的硝基苯(NB)溶液为模拟水样,进行了一系列提高降解效率的优化实验和光催化降解的对比实验.通过对硝基苯溶液初始浓度、TiO2加入量和降解体系pH值等条件的考察,得出硝基苯溶液的质量浓度为300mg/L,TiO2的加入量为0·4g/L,体系的pH值为6～7时,降解效果最好;通过对比实验发现,由于纳米管的大比表面积,使得其光催化性能明显优于球形纳米粒子,3h后的降解率达到90%以上,3·5h左右硝基苯几乎被完全降解.
The hydrothermal synthesis method was used to synthesize spherical TiO2 nanoparticles with controlled particle size and nanotubes with large aspect ratio and large specific surface area by changing the reaction conditions and controlling the reaction parameters. XRD, TEM, SAED and BET Etc. In order to test the photocatalytic performance of the product, a series of experiments were carried out to optimize the degradation efficiency and photocatalytic degradation with a high concentration of nitrobenzene (NB) The initial concentration of nitrobenzene solution, the amount of TiO2 added and the pH value of the degradation system were investigated. The results showed that the mass concentration of nitrobenzene solution was 300 mg / L, the dosage of TiO2 was 0.4 g / L, the pH value The results showed that the photocatalytic activity of the nanotubes was significantly better than that of the spherical nanoparticles due to the large specific surface area of the nanotubes. The degradation rate reached more than 90% after 3h and was about 3.5 h Nitrobenzene is almost completely degraded.