{"671247":{"#nid":"671247","#data":{"type":"event","title":"PhD Defense by Ziheng Shen","body":[{"value":"\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003ESchool of Civil and Environmental Engineering\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EPh.D. Thesis Defense Announcement\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003ESilver Adsorbents for Radioactive Iodine Capture in Nulcear Energy Applications\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003EBy\u003C\/strong\u003E\u0026nbsp;Ziheng Shen\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EAdvisor:\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EDr. Sotira Yiacoumi (CEE)\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003ECommittee Members:\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u0026nbsp; Dr. Yongsheng Chen (CEE), Dr. Costas Tsouris (CEE\/Oak Ridge National Lab), Dr. Xing Xie (CEE), Dr. Andrew Medford (ChBE)\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EDate and Time:\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u0026nbsp; Tuesday, December 12th, 2023, at 2pm\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cstrong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003ELocation: \u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/strong\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003ERoom 4222, Price Gilbert Memorial Library; \u003Cstrong\u003EZoom: \u003C\/strong\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Ca href=\u0022https:\/\/gatech.zoom.us\/j\/93337914447?pwd=MVFuYkVSZXI2VmlQUmIxY2xwZmE0dz09\u0022\u003Ehttps:\/\/gatech.zoom.us\/j\/93337914447?pwd=MVFuYkVSZXI2VmlQUmIxY2xwZmE0dz09\u003C\/a\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E.\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003EComplete announcement, with abstract, is attached.\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E\r\n\r\n\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003ENuclear power serves as a pivotal component of the global energy supply, yet managing spent nuclear fuel (SNF) produced during electricity generation remains a challenge. Reprocessing SNF to reuse uranium offers a viable solution in a sustainable fashion, but it releases radioactive iodine (129I), a hazardous byproduct that must be removed from the off gas streams. Silver (Ag) based adsorbents have shown efficacy in iodine capture, whereas further advancement on the material development and the process design relies on a more fundamental understanding of adsorption processes. In this context, the dissertation presented here addresses current knowledge gaps surrounding two prototype Ag adsorbents: reduced silver functionalized silica aerogel (Ag0-aerogel) and reduced silver exchanged mordenite (Ag0Z).\u003Cbr \/\u003E\r\n\u0026nbsp;\u003Cbr \/\u003E\r\nOne critical challenge with Ag0-aerogel is the diminishment in adsorption capacity after exposure to reprocessing off-gas at elevated temperatures, a phenomenon termed as \u2018aging.\u2019 Experiments were designed to evaluate the impact of three potential aging-inducing factors \u2013 oxygen, nitrogen dioxide, and temperature \u2013 on aerogel\u2019s capacity over time. Through extensive characterization of the aged samples, we deduced plausible mechanisms governing the capacity reduction and employed density functional theory (DFT) calculations for theoretical corroboration. The last part of this thesis focuses on Ag0Z, exploring its capture performance on long-chain alkyl iodides. Synchrotron pair distribution function (PDF) analysis provides insights into the mechanisms underlying the uptake of various iodine species by Ag0Z. A numerical modeling framework was implemented to describe and make predictions on the fixed-bed adsorption process. The methodology established in this study, integrating deep insights into the molecular-level adsorption mechanisms with practical considerations for large-scale applications, is instrumental to the optimization of iodine removal strategies in SNF reprocessing and related fields.\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cspan\u003E\u003Cspan\u003E\u003Cspan\u003ESilver Adsorbents for Radioactive Iodine Capture in Nulcear Energy Applications\u003C\/span\u003E\u003C\/span\u003E\u003C\/span\u003E\u003C\/p\u003E\r\n","format":"limited_html"}],"field_summary_sentence":[{"value":"Silver Adsorbents for Radioactive Iodine Capture in Nulcear Energy ApplicationsBy "}],"uid":"27707","created_gmt":"2023-11-27 20:08:33","changed_gmt":"2023-11-27 20:08:33","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2023-12-12T14:00:00-05:00","event_time_end":"2023-12-12T16:00:00-05:00","event_time_end_last":"2023-12-12T16:00:00-05:00","gmt_time_start":"2023-12-12 19:00:00","gmt_time_end":"2023-12-12 21:00:00","gmt_time_end_last":"2023-12-12 21:00:00","rrule":null,"timezone":"America\/New_York"},"location":"Room 4222, Price Gilbert Memorial Library; ","extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}