Titanium derived nuclear cleanup agents

钛衍生核净化剂

• 批准号: RGPIN-2015-05184
• 负责人: Kuznicki, Steven
• 金额: $ 2.19万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=656179
• 关键词: Titanium; derived; nuclear; cleanup; agents

Nuclear proliferation is one of the most dangerous and troubling issues facing humanity. The Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) was established to monitor worldwide nuclear activities. In addition to seismic stations, CTBTO maintains nearly 100 sites for the detection of radioactive isotopes of xenon which only occur during nuclear explosions or if nefarious isotopes (such as plutonium) are being produced. The background level of xenon isotopes coming from legitimate power and medical isotope reactors is generating so much background that the confidence level in spotting rogue nuclear activities is no longer at an acceptable level. Ag-ETS-10 is an extraordinary xenon adsorbent capable of removing xenon byproducts generated in legitimate nuclear activities. ETS-10 is in fact a series of polymorphs which do not all behave the same when interacting with silver (and thus, xenon). Identifying and synthesizing individual polymorphs of ETS-10 for silver exchange and xenon removal could well identify the most active forms and magnify the already extraordinary xenon concentrating power of ETS-10. This work will prepare and characterize polymorphs of ETS-10 as well as generate a framework substitution of ETS-10 to establish a maximum xenon binding power. Promising materials will be sent to CTBTO in an interactive program to mitigate xenon background issues and allow surer detection of rogue nuclear operations. ******ETS-2 is an exchangeable high surface area nanotitanante. Unlike molecular sieves ETS-2 has all of his active sites (~ 7 eq/kg) on its surface and has no porosity. Much like ETS-10, ETS-2 will template the formation of silver nanoparticles (generally about 5 nm) on its surface. Silver particles readily interact with gaseous iodine because all silver particles on ETS-2 are on the crystallite exterior and not on the interior which in humid streams can be `flooded' with water. The silver on ETS-2 is essentially all reactive towards gaseous iodine even at relatively high humidity. Gaseous iodine is one of the major pollutants generated by nuclear reactors. It currently is captured by massive beds of carbon adsorbents which pose large-scale disposal problems. A material like Ag-ETS-2 has ~ 3 orders of magnitude greater iodine capture capacity than carbon. Developing this to a finished product would allow miniaturization of iodine capture from nuclear reactors with proportionally lower disposal issues. In this effort, the silver capacity of ETS-2 will be maximized and binding and forming techniques established to make the materials into a robust, usable product. Promising materials will be forwarded in a collaborative effort with the Atomic Energy Canada Ltd at their Chalk River facility. **

核扩散是人类面临的最危险和最令人不安的问题之一。 全面禁止核试验条约组织（CTBTO）的成立是为了监督世界范围内的核活动。除地震台站外，禁核试组织还设有近100个地点，用于探测氙的放射性同位素，这些同位素只在核爆炸或生产邪恶同位素（如钚）时才会出现。来自合法电力和医用同位素反应堆的氙同位素的背景水平正在产生如此多的背景，以至于发现流氓核活动的信心水平不再处于可接受的水平。Ag-ETS-10是一种特殊的氙吸附剂，能够去除合法核活动中产生的氙副产品。ETS-10实际上是一系列多晶型物，它们在与银（以及氙）相互作用时的行为并不完全相同。鉴定和合成用于银交换和氙去除的ETS-10的各个多晶型物可以很好地鉴定最活跃的形式，并放大ETS-10已经非常出色的氙浓缩能力。这项工作将制备和表征ETS-10的多晶型物，并产生ETS-10的骨架取代，以建立最大的氙结合力。有希望的材料将通过一个互动程序发送到CTBTO，以减轻氙背景问题，并允许更可靠地检测流氓核操作。**ETS-2是一种可交换的高表面积纳米钛酸盐。与分子筛不同，ETS-2在其表面上具有所有的活性位点（~ 7 eq/kg），并且没有孔隙。与ETS-10非常相似，ETS-2将在其表面上形成银纳米颗粒（通常约5 nm）的模板。银颗粒容易与气态碘相互作用，因为ETS-2上的所有银颗粒都在微晶外部，而不是在内部，在潮湿的气流中，内部可能被水“淹没”。即使在相对高的湿度下，ETS-2上的银基本上都与气态碘反应。气态碘是核反应堆产生的主要污染物之一。目前，它被大量的碳吸附剂床捕获，这造成了大规模的处置问题。像Ag-ETS-2这样的材料具有比碳大~ 3个数量级的碘捕获能力。将其开发成成品将允许从核反应堆中捕获碘的小型化，并相应降低处置问题。在这项工作中，ETS-2的银容量将被最大化，并建立粘合和成型技术，使材料成为一个强大的，可用的产品。有希望的材料将在与加拿大原子能有限公司的合作努力中在他们的乔克河设施转发。**