Gopika Jagannivasan, Jayasree G Elambalassery, Suja Haridas
{"title":"Calix[4]resorcinarenes as Stable, Metal-Free Unexplored and Unfathomed Material for Iodine Capture: Experimental and Theoretical Insights","authors":"Gopika Jagannivasan, Jayasree G Elambalassery, Suja Haridas","doi":"10.1021/acs.chas.4c00037","DOIUrl":null,"url":null,"abstract":"While nuclear power offers a viable solution to the ever-growing energy demands, the piling up of nuclear waste remains a looming threat, endangering life on Earth. Safe disposal of radionuclides, especially highly volatile ones such as iodine, is a grave concern to be addressed for operational safety. Even though porous adsorbents for iodine capture have been widely investigated, less focus has been directed toward nonporous materials. Herein, we describe the synthesis of nonporous, macrocyclic Calix[4]resorcinarenes (C4Rs) via a near solventless green protocol mediated by Keggin-type phosphovanadotungstic acid and avoiding the use of mineral acids. The applicability of the synthesized C4Rs for iodine absorption at elevated temperatures has been explored. Facile synthesis strategy and metal-free nature coupled with moisture and temperature stability endorse our interest in C4Rs as highly attractive substrates for iodine sorption, with the substituent functionalities playing an important role in adsorption efficiency. We hereby report a novel C4R, DEAS, with an exceptional iodine sorption capability. The retention of iodine in the macrocyclic framework, mainly in the form of polyiodides, could be ascertained through a detailed characterization. The adsorption was found to follow pseudo-second-order kinetics. The adsorption of iodine from an aqueous solution was also subjected to investigation. Furthermore, theoretical investigation into the guest–host interactions between C4Rs and I<sub>2</sub> has been attempted for better insights.","PeriodicalId":12,"journal":{"name":"ACS Chemical Health & Safety","volume":null,"pages":null},"PeriodicalIF":2.9000,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Chemical Health & Safety","FirstCategoryId":"1","ListUrlMain":"https://doi.org/10.1021/acs.chas.4c00037","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH","Score":null,"Total":0}
引用次数: 0
Abstract
While nuclear power offers a viable solution to the ever-growing energy demands, the piling up of nuclear waste remains a looming threat, endangering life on Earth. Safe disposal of radionuclides, especially highly volatile ones such as iodine, is a grave concern to be addressed for operational safety. Even though porous adsorbents for iodine capture have been widely investigated, less focus has been directed toward nonporous materials. Herein, we describe the synthesis of nonporous, macrocyclic Calix[4]resorcinarenes (C4Rs) via a near solventless green protocol mediated by Keggin-type phosphovanadotungstic acid and avoiding the use of mineral acids. The applicability of the synthesized C4Rs for iodine absorption at elevated temperatures has been explored. Facile synthesis strategy and metal-free nature coupled with moisture and temperature stability endorse our interest in C4Rs as highly attractive substrates for iodine sorption, with the substituent functionalities playing an important role in adsorption efficiency. We hereby report a novel C4R, DEAS, with an exceptional iodine sorption capability. The retention of iodine in the macrocyclic framework, mainly in the form of polyiodides, could be ascertained through a detailed characterization. The adsorption was found to follow pseudo-second-order kinetics. The adsorption of iodine from an aqueous solution was also subjected to investigation. Furthermore, theoretical investigation into the guest–host interactions between C4Rs and I2 has been attempted for better insights.
期刊介绍:
The Journal of Chemical Health and Safety focuses on news, information, and ideas relating to issues and advances in chemical health and safety. The Journal of Chemical Health and Safety covers up-to-the minute, in-depth views of safety issues ranging from OSHA and EPA regulations to the safe handling of hazardous waste, from the latest innovations in effective chemical hygiene practices to the courts'' most recent rulings on safety-related lawsuits. The Journal of Chemical Health and Safety presents real-world information that health, safety and environmental professionals and others responsible for the safety of their workplaces can put to use right away, identifying potential and developing safety concerns before they do real harm.