碳纳米管负载TiO2光催化降解腈纶废水

目的：采用溶胶-凝胶法制备负载二氧化钛的多壁碳纳米管，对其结构进行X-射线粉末衍射（XRD）、透射电镜表征，探讨负载二氧化钛的碳纳米管用于腈纶废水的处理。方法：以300W中压汞灯为光源，在250ml的腈纶废水中加入100mg负载有TiO2的碳管光催化处理1h，废水的CODCr去除率达22％；经Fenton试剂进行预处理后，加入150mg载有TiO2的碳纳米管进行光催化实验，经光催化氧化3h后，CODCr去除率达到90％，处理效果非常明显。结果：实验结果表明，该种催化剂具有很好的光催化活性。结论：用Fenton试剂预处理与TiO2光催化联合使用，对含腈废水中的难降解有机物去除效果好，具有一定的实用性。

Photocatalytic degradation of pollutants on acrylic fiber wastewater with TiO2 nanoparticles coated on carbon nanotubes

Objective:The photocatalysts of TiO_2 nanoparticles coated on carbon nanotubes were prepared by the sol-gel method,which were characterized by XRD and TEM.The photocatalytic degradation of the pollutants in acrylic fibre wastewater was investigated with the photocatalysts TiO_2/carbon nanotubes composites.Methods:When 100 mg TiO_2/carbon nanotubes composites were added into 250 ml of the acrylic fibre wastewater,the mixtures were irradiated by 300 W Hg lamp for 1 h,the efficiency of the reduction of COD_(Cr) was 22%.The efficiency of the reduction of COD_(Cr) would turn to 90%,if the acrylic fibre wastewater were pretreated with fenton reagent,then mixture with 150 mg TiO_2/carbonnanotubes and photocatalyzed for 3 h.Results:The results indicated that the photocatalysts possess high photocatalytic activity.Conclusion:The experimental results showed that the combination of fenton reagent pretreatment and photocatalytic oxidation over TiO_2/carbonnanotubes have an ideal effect,and it is valuable for practical applications.