| 催化臭氧氧化过程中溴酸盐的生成机制研究 |
| 摘要点击 7099 全文点击 3548 投稿时间：2010-09-19 修订日期：2010-12-22 |
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| 中文关键词 溴酸盐 催化臭氧化 反应机制 黄河水 Fe3O4 |
| 英文关键词 bromate catalytic ozonation reaction mechanism Yellow River water Fe3O4 |
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| 中文摘要 |
| 以黄河下游某水厂滤后水为目标物，选择了9种催化剂，在间歇反应装置中研究了单独臭氧和催化臭氧氧化过程中溴酸盐(BrO-3)的生成情况，结果表明，在催化臭氧氧化过程中，NiO、CuO、Fe3O4、Al2O3加入使BrO-3 质量分数分别降低34.0%、 32.8%、 29.2%、 20.8%.选取Fe3O4作为催化剂研究催化臭氧氧化滤后水过程中BrO-3 生成情况.结果表明，反应过程中的Rct值随反应时间的延长而降低，整个反应过程中Rct值在10-8～10-6之间.单独臭氧氧化滤后水时，BrO-3的生成主要是直接-间接途径和间接-直接途径共同作用的结果；催化臭氧氧化生成BrO-3的主要途径是间接-直接途径.此外，催化臭氧氧化过程中有效提高了有机物的降解，UV254的降解率提高到60.7%.研究表明，催化臭氧氧化能有效抑制BrO-3的生成，又能提高对有机物的去除效果. |
| 英文摘要 |
| In a batch reactor, the BrO-3 formation was investigated in the ozonation and catalytic ozonation of Br--containing Yellow river water, using the different heterogeneous catalysts. The results showed that BrO-3 minimization was achieved in the catalytic ozonation with NiO, CuO, Fe3O4 and Al2O3 as catalysts and the percent reductions of BrO-3 were 34.0%, 32.8%, 29.2% and 20.8% respectively. In the reaction Rct, the ratio of concentration of ·OH to O3, decreased with the reaction time, and the range of Rct was from 10-8 to 10-6. In the ozonation process, one of the main reaction pathways of BrO-3 formation was the combination oxidation of Br-by ·OH and then O3, another was the combination oxidation of Br- by O3 and then ·OH. In the catalytic ozonation with Fe3O4 catalyst, the main pathway was the combination oxidation by ·OH and then O3. Moreover, about 60.7% removal for UV254 was obtained after 20 min in the catalytic ozonation reaction. In our study, it was found that the catalytic ozonation process can effectively minimize the formation of BrO-3 and also oxidize organic compounds. |
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