Pd/Fe^0双金属复合催化纤维降解水中痕量亚硝基二甲胺  

Degradation of N-nitrosodimethylamine by Palladium/Iron Bimetallic Composite Catalytic Fiber

作　　者：张环[1,2,3] 傅敏[2] 魏俊富[1,2,3] 王一冰[2] 安慧颖[2] 沈书怡 

机构地区：[1]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 [2]天津工业大学环境与化学工程学院,天津300387 [3]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

出　　处：《环境科学》2017年第7期2868-2874,共7页Environmental Science

基　　金：国家自然科学基金项目(41301542;51678409);天津市科技计划项目(15PTSYJC00240)

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/Fe^0双金属的复合催化纤维(Pd/Fe^0-PP-gAA),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/Fe^0/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.CO_3^(2-)和NO_3^-的存在显著抑制NDMA的降解,SO_4^(2-)、HCO_3^-和腐殖酸的存在对NDMA降解影响较小.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/Fe^0 bimetal were prepared by the UV irradiation-coordination method for the removal of trace NDMA. Pd/Fe^0/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/Fe^0/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/Fe^0/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.

关 键 词：聚丙烯纤维 亚硝基二甲胺 双金属 配位 催化 

分 类 号：X131.2[环境科学与工程—环境科学]