| Pd/Fe0双金属复合催化纤维降解水中痕量亚硝基二甲胺 |
| 摘要点击 1789 全文点击 677 投稿时间：2017-01-23 修订日期：2017-03-27 |
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| 中文关键词 聚丙烯纤维 亚硝基二甲胺 双金属 配位 催化 |
| 英文关键词 Polypropylene fiber N-nitrosodimethylamine bimetal coordination catalytic |
| 作者 | 单位 | E-mail | | 张环 | 天津工业大学省部共建分离膜与膜过程国家重点实验室, 天津 300387
天津工业大学环境与化学工程学院, 天津 300387
天津工业大学天津市水质安全评价与保障技术工程中心, 天津 300387 | zhanghuan@tjpu.edu.com | | 傅敏 | 天津工业大学环境与化学工程学院, 天津 300387 | | | 魏俊富 | 天津工业大学省部共建分离膜与膜过程国家重点实验室, 天津 300387
天津工业大学环境与化学工程学院, 天津 300387
天津工业大学天津市水质安全评价与保障技术工程中心, 天津 300387 | | | 王一冰 | 天津工业大学环境与化学工程学院, 天津 300387 | | | 安慧颖 | 天津工业大学环境与化学工程学院, 天津 300387 | | | 沈书怡 | 天津工业大学环境与化学工程学院, 天津 300387 | |
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| 中文摘要 |
| 存在于环境水体中的亚硝基二甲胺（NDMA）是一种强致癌性有机物，采用零价铁催化还原技术可以将其降解转化为低毒性物质，针对水中痕量NDMA的去除，需要深入开展基于高效零价铁材料、还原性能及还原机制方面的研究.以聚丙烯（PP）纤维为基材，采用紫外辐射接枝-金属离子配位-化学还原方法制备了含Pd/Fe0双金属的复合催化纤维（Pd/Fe0-PP-g-AA），开展水中亚硝基二甲胺的去除研究.通过SEM、ICP-AES和XPS分析等对Pd/Fe0/PP-g-AA进行表征.研究了不同制备条件和反应条件下，复合催化纤维对NDMA的降解性能.结果表明，丙烯酸单体质量分数为20%时，通过配位还原制备的复合催化纤维对NDMA的催化降解效果最佳，降解过程符合准一级反应动力学模型.在痕量浓度范围，NDMA初始浓度和溶液pH对复合纤维还原NDMA的性能影响不大.CO32-和NO3-的存在显著抑制NDMA的降解，SO42-、HCO3-和腐殖酸的存在对NDMA降解影响较小. |
| 英文摘要 |
| N-nitrosodimethylamine (NDMA) in the water environment is a carcinogenic organic contaminant, which can be converted to hypotoxic compounds by zero-valent iron degradation. For the removal of trace NDMA in water, the theory and efficiency of zero-valent iron degradation should be intensely researched. In this study, the polypropylene (PP) fibers were chosen as substrate materials and the composite catalyst fibers containing Pd/Fe0 bimetal were prepared by the UV irradiation-coordination method for the removal of trace NDMA. Pd/Fe0/PP-g-AA was characterized by scanning electron microscope, inductively coupled plasma atomic emission spectrometry, and X-ray photoelectron spectroscopy. The NDMA removal by Pd/Fe0/PP-g-AA under different conditions was investigated. The results indicated that when the acrylic acid monomer mass fraction was 20%, the composite catalytic fiber Pd/Fe0/PP-g-AA showed a better degradation effect on NDMA. The removal of NDMA followed the pseudo-first-order reaction kinetics model. The initial NDMA concentration and the pH of the solution could not greatly influence the catalytic degradation of trace amounts of NDMA. The presence of CO32- and NO3- significantly inhibited the degradation of NDMA. However, the NDMA degradation had been less affected by SO42-, HCO3-, and nature organic matter (NOM) existing in the solution. |
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