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以γ-Al2O3为载体,采用浸渍焙烧法制备了负载型催化剂RuO2-CeO2/γ-Al2O3、Fe2O3-CeO2/γ-Al2O3、Fe2O3/γ-Al2O3。在扬水曝气条件下,以西安某水源水库水为原水,考察了各催化剂对有机微污染物的净化效果,实验发现,催化剂反复多次使用并无明显失活现象,连续使用20 d以消除单纯吸附的影响后,仍然可在7 d内使UV254、CODMn、DOC的去除率分别达到38%、28%和27%。离子溶出实验表明,Fe2O3/γ-Al2O3有很好的稳定性。综合考虑处理效果、制备工艺以及制备成本,选择Fe2O3/γ-Al2O3为最佳催化剂。为了使催化剂Fe2O3/γ-Al2O3具有最佳活性,分别考察了焙烧时间、焙烧温度、浸渍液浓度、浸渍时间等,并对其制备工艺进行了优化。然后反应前后水样的分子量测定结果表明,反应后大分子比例下降,而小分子比例提高,说明催化氧化将一定量的大分子降解成为小分子。
The supported catalysts RuO2-CeO2 / γ-Al2O3, Fe2O3-CeO2 / γ-Al2O3, Fe2O3 / γ-Al2O3 were prepared by impregnation calcination using γ-Al2O3 as carrier. Under the aeration of Yangzhou water, a water source and reservoir water in Xi’an was used as raw water, and the purification effect of each catalyst on organic micro-pollutants was investigated. It was found that there was no obvious deactivation phenomenon after repeated use of catalyst for 20 days to eliminate The adsorption of UV254, CODMn and DOC could still reach 38%, 28% and 27% respectively after 7 days. Ion dissolution experiments show that, Fe2O3 / γ-Al2O3 has good stability. Considering the treatment effect, preparation process and preparation cost, Fe2O3 / γ-Al2O3 was selected as the best catalyst. In order to make the catalyst Fe2O3 / γ-Al2O3 have the best activity, the calcination time, calcination temperature, impregnation concentration, immersion time and so on were investigated respectively, and the preparation process was optimized. The results of molecular weight determination before and after the reaction showed that the proportion of macromolecules decreased and the proportion of small molecules increased after the reaction, indicating that catalytic oxidation degraded a certain amount of macromolecules into small molecules.