纳米光催化材料免回收处理TNT废水

为提高纳米粒子的分散性和避免水处理时的回收程序，制备了附载型纳米复合粒子和光催化反应器。利用扫描电子显微镜（SEM）、X射线衍射图谱（XRD）和比表面积测试仪分析发现，制备的纳米TiO2／硅藻土复合粒子和纳米TiO2／SiO2复合粒子的纳米颗粒细小，比表面积和孔容积大。将纳米光催化复合材料负载于光催化反应器或直接分散于废水中，对比研究发现：重复使用6次后，前者的纳米光催化复合粒子对TNT废水的光催化降解效率保持90％以上，而后者的降解效率从97％迅速下降至50％左右。同时，红外光谱分析发现，后者处理后废水中发现有纳米光催化材料的存在；而借助于光催化反应器处理后废水中未发现有纳米光催化材料的残存，不需要额外的纳米材料回收程序。

Treatment of TNT Wastewater with Nanometer Photocatalysts Recycle-free

To improve the dispersion of nanoparticles and avoid the recycle process of nanomaterials for water treatment,nanocomposite materials were prepared and a new photocatalytic reactor was designed. SEM, XRD and specific surface area tester were employed to characterize the as-prepared nanometer TiO₂/diatomite composites and nanometer TiO₂/SiO₂ composites. Results show that the as-prepared nanocomposite materials are in the nature of very fine nanometer particles in diameter and high specific surface area and pore volume. After 6 times reusing of the as-prepared nanocomposite materials, the degradation efficiencies of TNT wastewater are kept over 90 percent by loading it on the photocatalytic reactor,while the degradation efficiencies are decreased quickly from about 97 percent to about 50 percent by dispersing nanocomposite materials in wastewater. Furthermore, IR spectra results of treated-wastewater show that residual nanocomposite materials are dispersed in wastewater. However, the residual photocatalysts are not dispersed in the treated-wastewater by using the photocatalytic reactor,which mean that the recycle processes to nanometer photocatalysts are not required anymore for normal wastewater treatment.