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真空紫外光臭氧降解偏二甲肼的研究

Keywords: 偏二甲肼,真空紫外,臭氧,甲醛

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Abstract:

研究比较了臭氧氧化(O3)、紫外臭氧(O3/UV)和真空紫外臭氧(O3/VUV)对推进剂——偏二甲肼的处理效果,O3/VUV最为有效,反应速率常数分别比O3/UV和O3高39.8%和65.6%,中间产物——甲醛去除得更迅速,反应50min即无法检出。初始pH9时,O3/VUV降解偏二甲肼的速率最快,达到0.4461min-1;反应速率常数随臭氧投加量的增加而线性增大;随偏二甲肼初始浓度从100mg/L增加到2000mg/L,反应动力学由一级转为零级。碳酸盐浓度在0~2mmol/L范围内对O3/VUV降解偏二甲肼没有明显的抑制作用。偏二甲肼的无机氮产物以氨离子为主,无机氮只占总氮的40%~60%,说明仍有相当比例的氮以有机氮形式存在。

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