Dehalogenation of chlorinated hazardous organics

氯化有害有机物的脱卤

• 批准号: 6328396
• 负责人: Dibakar Bhattacharyya
• 金额: $ 14.25万
• 依托单位: UNIVERSITY OF KENTUCKY
• 依托单位国家: 美国
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-07 至 2005-03-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6328396
• 关键词: environmental toxicology; halobiphenyl /halotriphenyl compound; halogenation; hazardous substances; iron; method development; reducing agents; toxin metabolism; vitamin B12; waste treatment; environmental toxicology; halobiphenyl /halotriphenyl compound; halogenation; hazardous substances; iron; method development; reducing agents; toxin metabolism; vitamin B12; waste treatment

The development of highly efficient liquid phase remediation technologies for chlorinated organics and the simultaneous understanding of health and nutrition effects are critical for solving Superfund site problems. Reductive dehalogenation technologies, in contrast to oxidative techniques, are known to provide complete detoxification. Reductive processes (zero-valent iron, vitamin B12) can lead to complete dehalogenation to HC1, water and non-halogenated volatile organics if the degradation pathways are controlled. Understanding and control of the degradation pathways to yield innocuous degradation products in short residence times (less than 1 hour) under ambient temperature conditions has yet to be accomplished. The overall objectives of this work are to study the role of the reductive agent morphology on the product distribution and rate, establish the degradation rates of intermediate byproducts (vinyl chloride is an example), and close the elemental balances (particularly C and C1) around the degradation processes. The reductive agent systems to be investigated are zero-valent iron particles, zero-valent nanoscale metal particles and composites, high surface area/high porosity iron coated composites, and novel immobilized vitamin B12 derivative (electropolymerization) systems. With Vitamin B12 the overall rates can be enhanced by incorporating the active complex in polymer films and by using electrochemical techniques to regenerate the active enter. The role of surface morphology and the development of highly reactive materials to reduce reaction time and to enhance intermediate product degradation rates needs thorough investigation for the development of highly efficient remediation systems. In addition to the development of highly versatile models for chlorinated organics dehalogenation rates, we plan to establish the reactive surface morphology (by ARM and XPS methods) changes as a function of reaction time.

用于氯化有机物的高效液相补救技术的开发以及对健康和营养效应的同时了解对于解决超级基金站点问题至关重要。与氧化技术相比，还原性的脱氧化技术可提供完全排毒。如果控制降解途径，还原过程（零价铁，维生素B12）可能会导致对HC1，水和非卤代挥发性有机物的完全脱核化。了解和控制降解途径，以在周围温度条件下短暂停留时间（少于1小时）产生无害的降解产物。这项工作的总体目标是研究还原剂形态在产品分布和速率上的作用，确定中间副产品的降解速率（氯化乙烯基是一个例子），并在降解过程中关闭元素平衡（尤其是C和C1）。要研究的还原剂系统是零价铁颗粒，零价值的纳米级金属颗粒和复合材料，高表面积/高孔隙率铁涂层复合材料以及新颖的固定维生素B12衍生物（电聚合）系统。使用维生素B12，可以通过在聚合物膜中并使用电化学技术来再生活性输入来提高总体速率。表面形态的作用和高反应性材料减少反应时间并提高中间产品降解速率的作用需要彻底研究，以开发高效的补救系统。除了开发高度用途的有机物脱酰化速率的高度用途模型外，我们计划建立反应时间的反应性表面形态（通过ARM和XPS方法）变化。