摘要
含偏二甲肼(UDMH)的废水在臭氧氧化过程中会显著生成高毒性且难降解的次级氧化产物亚硝基二甲胺(NDMA),采用臭氧/紫外(O_(3)/UV)联用技术仍不能有效抑制NDMA的生成和彻底氧化NDMA.我们以Fe_(2)O_(3)/γ-Al_(2)O_(3)为催化剂,采用多相催化氧化-O_(3)/UV联用技术对含UDMH的废水进行了氧化处理,详细对比了有无催化剂时UDMH的降解效率以及次级氧化产物NDMA生成、氧化消除的规律,结果表明,多相催化技术与O_(3)/UV联用能够显著提高对废水中UDMH的氧化分解效率,且能有效地抑制NDMA的生成和促进NDMA的氧化消除.通过反应参数的优化,确定了最佳的反应条件.在此基础上,对UDMH和NDMA的氧化降解反应动力学进行了对比研究,结果显示,多相催化技术有效提升了NDMA在O_(3)/UV中的氧化降解效率,使得反应所产生的NDMA可以及时分解.我们还对稳定性进行了研究,催化剂经8次循环仍保持较高的催化活性和稳定性.我们的研究结果表明多相催化-O_(3)/UV联用技术对含UDMH废水处理有优良的适用性,综合效能优于现用的O_(3)/UV处理技术.
The formation of remarkable amount of N-nitrosodimethylamine(NDMA)in the unsymmetrical dimethylhydrazine(UDMH)waste water treatment by O_(3)/UV method indicates that the O_(3)/UV technology can not inhibit the formation of NDMA and totally destroy NDMA during the process.In this paper,the new route of UDMH treatment via heterogeneous catalytic O_(3)/UV was developed,in which Fe_(2)O_(3)/γ-Al_(2)O_(3)catalyst was used in O_(3)/UV.Reaction parameters were studied in detail,and the formation,elimination of NDMA and the decomposition of UDMH regulations were presented.The results indicated that the addition of catalyst could significantly promote the totally UDMH oxidation process,i.e.,inhibition of NDMA formation and destroy were remarkable enhanced.In addition,the kinetics of UDMH and NDMA oxidation are compared.The results show that the NDMA produced during UDMH oxidation can be decomposed rapidly because the heterogeneous catalytic technology effectively promotes the oxidative degradation efficiency of NDMA in O_(3)/UV.The stability tests showed that the catalyst was rather stable,the stability was remained even after 8 runs.Therefore,the heterogeneous catalytic O_(3)/UV technology would be suitable in the treatment of UDMH waste water.
作者
季增宝
杨宝军
孙剑宇
钱铃
吕功煊
JI Zeng-bao;YANG Bao-jun;SUN Jian-yu;Qian Ling;LU Gong-xuan(Xi′an Aerospace Propulsion Test Technique Institute,Xi′an 710100,China;Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《分子催化》
CAS
CSCD
北大核心
2022年第2期99-108,共10页
Journal of Molecular Catalysis(China)
基金
国家重点研发计划(2018YFB1502004)
关键词
偏二甲肼
亚硝基二甲胺
多相催化氧化-臭氧-紫外光联用
unsymmetrical dimethyl hydrazine
N-nitrosodimethylamine
heterogeneous catalytic O_(3)/UV oxidation technology
