Adsorption-based capture of iodine and organic iodides: status and challenges. Issue 11 (1st March 2023)

• Record Type: Journal Article
• Authors: Pan, Tingting; Yang, Kaijie; Dong, Xinglong; Han, Yu
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 11(2023)
• Page Start: 5460
• Page End: 5475
• Publication Date: 2023-03-01
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta09448g
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : This review discusses the current status and challenges in the development of novel iodine capture adsorbents, focusing on adsorption mechanisms and evaluation methods. Abstract : Nuclear energy is a sustainable low-carbon energy source that plays an increasingly important role in supporting the progress of human society. However, there are safety issues associated with the operation of nuclear reactors. In particular, volatile radioactive elements, primarily 129 I and 131 I, in the form of molecular iodine (I2 ) or organic iodides ( e.g., CH3 I and CH3 CH2 I), are harmful for the environment and human health and must be removed before discharging the off-gas. Adsorption processes employing porous solid adsorbents to capture radioactive iodine compounds have attracted considerable attention owing to their simple operation and low maintenance cost and because they avoid the use of highly corrosive solutions. Despite the efforts devoted to developing novel adsorbents for iodine capture, certain critical issues related to practical applications have been overlooked. This review summarizes the adsorption mechanisms employed to capture I2 and CH3 I, focusing on the different adsorbent requirements. This review also compares the static and dynamic evaluation systems, analyzes the structure–function relationship under different testing conditions, and highlights the importance of using appropriate conditions to evaluate adsorbents. Moreover, the simultaneous capture of I2 and CH3 I is discussed, which is quite challenging but has been largely ignored in previous studies. Finally, this review outlines the challenges and opportunities in this field from the perspective of materials design and system evaluation, indicating that properly designing adsorbents to provide sufficient chemisorption sites may be the only way to meet the practical application requirements.