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水—有机两相体系中二噁英类化合物的催化加氢脱卤降解
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摘要
芳烃卤代物以其高毒性和难降解性对人类健康和环境所造成的严重威胁日益受到重视。温和条件下的催化加氢技术以其简单、安全、高效等优点被认为是当前最有应用前景的卤代有机物降解技术而受到研究者的广泛关注。
     本论文主要开展了温和条件下、液相体系中Pd/C催化4-溴联苯、2,4,8-TCDF与变压器油中PCBs的加氢脱卤方法研究,通过研究催化剂的失活机制和相转移试剂的调控机制,发展了有机-水两相体系中二噁英类污染物的加氢脱卤方法,实现了温和条件下高浓度二噁英、多氯联苯等POPs高效加氢降解,为我国库存POPs的消减提供了一种有效的降解方法和技术。同时,还深入探讨了温度、碱、溶剂与相转移剂等因素对脱氯反应的影响以及2,4,8-TCDF加氢脱氯反应过程中的选择性问题。
     在温和条件下,水-有机两相体系中4-溴联苯、2,4,8-TCDF与变压器油中PCBs均可实现高效脱卤。碱、溶剂及相转移剂等是两相脱卤过程中影响脱卤速率的主要因素,此外,温度、取代基类型、水-有机比等因素也在不同程度上影响着脱卤速率。
Aromatic halides have been receiving increasing concern for which had a great threat to human health and could cause serious environmental pollution due to their high toxity and low degradability. The catalytic hydrodehalogenation is considered to be the most promising method for eliminating of aryl halides because of it is simple, safe and efficient. Many a researchers paid much attention to the hydrodehalogenation in both gas-phase and liquid-phase with various catalysts.
     In this work, the catalytic hydrodehalogenation methods of 4-bromobiphenyl, 2,4,8-trichlorodibenzofuran (2,4,8-TCDF) and polychlorinated biphenyls (PCBs) of transformer oil were examined in liquid phase under mild conditions over Pd/C catalyst. By means of studying the mechanisms of deactivation of catalyst and regulation of phase transfer agents, a technology of hydrodehalogenation of dioxin-like compounds was developed under a aqueous-organic system. High concentration of dioxins, PCBs and other POPs especially for those possess high hydrophobicity a efficient conversion were realised in this reaction system. In light of these research results, a new technology or method was proposed for eliminating large stockage of POPs in our country. Meanwhile, the effects of temperature, alkali, solvent and phase transfer agent on the dehalogenation reaction as well as hydrogenation selectivity in 2,4,8-TCDF hydrodechlorination process were investigated.
     4-bromobiphenyl, 2,4,8-trichlorodibenzofuran (2,4,8-TCDF) and polychlorinated biphenyls (PCBs) of transformer oil can be degradated efficiently under mild conditions in a biphase system. Alkali, solvent and phase transfer agent act as the most important factors in the hydrodehalogenation process. Additionally, temperature, type of substituent group and the ratio of aqueous/oganic solvent also affect the results greatly.
引文
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