摘要：

设计研制了一种光催化超滤反应器，并选用一种纳米级颗粒状TiO₂做光催化剂，对染料酸性胡兰(AcidBlue 7)氧化降解进行了研究。试验结果表明，光催化超滤反应器对染料废水有很好的降解效果，且粉末态催化剂能够实现良好分离。通过对影响反应系统的操作参数研究发现，当错流速度从0.45 m/s增加到1.06 m/s时，降解速率常数也从0.070 8 min^-1提高到0.151 5 min^-1；反应系统的最佳TiO₂投加质量浓度为0.5 g/L；当染料质量浓度从5 mg/L增加到25 mg/L，相应的反应速率常数也从0.162 5 min^-1降为0.053 0 min^-1；反应系统中用纯氧曝气可以得到最佳的染料去除效果；当染料废水在pH为2时，其去除效果非常明显。

关键词: 颗粒状纳米TiO₂, 光催化, 超滤, 酸性胡兰

Abstract:

A set of photocatalytic-ultrafiltration separation reactor for the degradation of acid blue 7 by using nanoparticle TiO₂ as photocatalyst has been designed. The experimental results showthat the well degradation effects of dye wastewaters are achieved by this reactor and TiO₂ particle can be separated from water successfully. The results obtained from influencing parameters of photocatalytic membrane reactor′s kinetic studies indicates that the rate increases from 0.0708min-1 to 0.151 5 min-1 with increasing cross-flow velocity ranging from 0.45 m/s to 1.06 m/s. The optimum TiO₂ dosage is 0.5 g/L. The increase in the initial dye concentration from 5 mg/L to 25 mg/L can decrease the degradation rate constant from 0.162 5 min-1 to 0.053 0 min-1. Being aerated with industrial grade oxygen in the experiment can get the best removal results. The pH values have substantial effect on the degradation of acid blue 7，particularly at pH 2.

Key words: nano-particle TiO₂, photocatalysis, ultrafiltration, acid blue 7

中图分类号: 

• X791